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Isidro Villó-Pérez, obtained his first degree in Fisicis at the Granada University, in Spain in 1993. Later, in 1998, he completed his PhD Thesis under the title: “Contributions to the FDTD method for the numerical solution of Maxwell's equations” in the same university. Currently, he is professor associate at Technical University of Cartagena, in Spain and belongs to the Department of Electronics and Computer Technologies.
Acoustic leaky-wave antennas (ALWAs) have demonstrated the capacity to steer directive sound waves in frequency-dependent directions, due to the inherent dispersive radiation characteristic of leaky modes. Compared to more conventional uniform linear array (ULA) acoustic traducers for electronic beam steering (which rely on multiple sensors), the ALWA allows for single microphone operation. Thus, ALWAs offer a direct mechanism to scan a directive acoustic beam in the angular space by simply sweeping the operating frequency of the acoustic signal, which envisions cost-efficient single-transducer direction finders for SONAR applications. In this paper, we study for the first time some important features of an ALWA for acoustic underwater Direction-of-Arrival (DoA) estimation applications. First, we report for the first time on the necessity to shape the radiated ALWA beams in both far- and near-field zones to improve the DoA estimation performance, following similar techniques recently applied for low-cost frequency-scanned direction-finding radars based on LWAs. Furthermore, the capacity to reduce the Side Lobe Level (SLL) has been analyzed in order to improve performance, demonstrating aperture tapering techniques to the ALWA for the first time. These acoustic behaviour aspects have a considerable interest in real applications of ALWA in innovative SONAR systems for underwater scenarios.
Ivan Felis-Enguix; Jorge Otero-Vega; María Campo-Valera; Isidro Villó-Pérez; J. L. Gómez-Tornero. Practical Aspects of Acoustic Leaky-Wave Antennas Applied to Underwater Direction Finding. Proceedings of 7th International Electronic Conference on Sensors and Applications 2020, 2, 93 .
AMA StyleIvan Felis-Enguix, Jorge Otero-Vega, María Campo-Valera, Isidro Villó-Pérez, J. L. Gómez-Tornero. Practical Aspects of Acoustic Leaky-Wave Antennas Applied to Underwater Direction Finding. Proceedings of 7th International Electronic Conference on Sensors and Applications. 2020; 2 (1):93.
Chicago/Turabian StyleIvan Felis-Enguix; Jorge Otero-Vega; María Campo-Valera; Isidro Villó-Pérez; J. L. Gómez-Tornero. 2020. "Practical Aspects of Acoustic Leaky-Wave Antennas Applied to Underwater Direction Finding." Proceedings of 7th International Electronic Conference on Sensors and Applications 2, no. 1: 93.
For years, in the field of underwater acoustics, a line of research with special relevance for applications of environmental monitoring and maritime security has been developed that explores the possibilities of non-linear phenomena of sound propagation, especially referring to the so-called parametric effect or self-modulation. This article shows the results of using a new modulation technique based on sine-sweep signals, compared to classical modulations (FSK and PSK). For each of these modulations, a series of 16-bit strings of information with different frequencies and durations have been performed, with the same 200 kHz carrier wave. All of them have been tested in the Hydroacoustic Laboratory of the CTN and, through the application of cross-correlation processing, the limitations and improvements of this novel processing technique have been evaluated. This allows reaching better limits in discrimination of bits and signal-to-noise ratio used in underwater parametric acoustic communications.
María Campo-Valera; Ivan Felis-Enguix; Isidro Villó-Pérez. Signal Processing for Parametric Acoustic Sources Applied to Underwater Communication. Sensors 2020, 20, 5878 .
AMA StyleMaría Campo-Valera, Ivan Felis-Enguix, Isidro Villó-Pérez. Signal Processing for Parametric Acoustic Sources Applied to Underwater Communication. Sensors. 2020; 20 (20):5878.
Chicago/Turabian StyleMaría Campo-Valera; Ivan Felis-Enguix; Isidro Villó-Pérez. 2020. "Signal Processing for Parametric Acoustic Sources Applied to Underwater Communication." Sensors 20, no. 20: 5878.
Aims. Our scientific goal is to provide revised membership lists of the α Per, Pleiades, and Praesepe clusters exploiting the second data release of Gaia and produce five-dimensional maps (α, δ, π, μα cos δ, μδ) of these clusters. Methods. We implemented the kinematic method combined with the statistical treatment of parallaxes and proper motions to identify astrometric member candidates of three of the most nearby and best studied open clusters in the sky. Results. We cross-correlated the Gaia catalogue with large-scale public surveys to complement the astrometry of Gaia with multi-band photometry from the optical to the mid-infrared. We identified 517, 1248, and 721 bona fide astrometric member candidates inside the tidal radius of α Per, the Pleiades, and Praesepe, respectively. We cross-matched our final samples with catalogues from previous surveys to address the level of completeness. We update the main physical properties of the clusters, including mean distance and velocity, as well as core, half-mass, and tidal radii. We infer updated ages from the white dwarf members of the Pleiades and Praesepe. We derive the luminosity and mass functions of the three clusters and compare them to the field mass function. We compute the positions in space of all member candidates in the three regions to investigate their distribution in space. Conclusions. We provide updated distances and kinematics for the three clusters. We identify a list of members in the α Per, Pleiades, and Praesepe clusters from the most massive stars all the way down to the hydrogen-burning limit with a higher confidence and better astrometry than previous studies. We produce complete 5D maps of stellar and substellar bona fide members in these three regions. The photometric sequences derived in several colour–magnitude diagrams represent benchmark cluster sequences at ages from 90 to 600 Myr. We note the presence of a stream around the Pleiades cluster extending up to 40 pc from the cluster centre.
N. Lodieu; Antonio Perez-Garrido; R. L. Smart; Roberto Silvotti. A 5D view of the α Per, Pleiades, and Praesepe clusters. Astronomy & Astrophysics 2019, 628, A66 .
AMA StyleN. Lodieu, Antonio Perez-Garrido, R. L. Smart, Roberto Silvotti. A 5D view of the α Per, Pleiades, and Praesepe clusters. Astronomy & Astrophysics. 2019; 628 ():A66.
Chicago/Turabian StyleN. Lodieu; Antonio Perez-Garrido; R. L. Smart; Roberto Silvotti. 2019. "A 5D view of the α Per, Pleiades, and Praesepe clusters." Astronomy & Astrophysics 628, no. : A66.
We demonstrate that the previously identified L/T transition brown dwarf SDSS J213154.43−011939.3 (SDSS 2131−0119) is a widely separated (82${^{\prime\prime}_{.}}$3, ∼3830 au) common proper motion companion to the low-mass star NLTT 51469, which we reveal to be a close binary itself, separated by 0${^{\prime\prime}_{.}}$64 ± 0${^{\prime\prime}_{.}}$01 (∼30 au). We find the proper motion of SDSS 2131−0119 of μαcos δ = −100 ± 20 mas yr−1 and μδ = −230 ± 20 mas yr−1 consistent with the proper motion of the primary provided by Gaia DR2: μαcos δ = −95.49 ± 0.96 mas yr−1 and μδ = −239.38 ± 0.96 mas yr−1. Based on optical and near-infrared spectroscopy, we classify the primary NLTT 51469A as an M3 ± 1 dwarf, estimate photometrically the spectral type of its close companion NLTT 51469B at ∼M6, and confirm the spectral type of the brown dwarf to be L9 ± 1. Using radial velocity, proper motion, and parallax, we derived the UVW Galactic space velocities of NLTT 51469A, showing that the system does not belong to any known young stellar moving group. The high V, W velocities, lack of a 670.8 nm Li i absorption line, and absence of H α emission, detected X-rays, or UV excess, indicate that the system is likely a member of the thin disc population and is older than 1 Gyr. For the parallactic distance of 46.6 ± 1.6 pc from Gaia DR2, we determined luminosities of $-1.50^{+0.02}_{-0.04}$ and −4.4 ± 0.1 dex of the M3 and L9, respectively. Considering the spectrophotometric estimation, which yields a slightly lower distance of $34^{+10}_{-13}$ pc, the obtained luminosities are $-1.78^{+0.02}_{-0.04}$ and $-4.7^{+0.3}_{-0.5}$ dex. We also estimated their effective temperatures and masses, and obtained 3410$^{+140}_{-210}$ K and 0.42 ± 0.02 M⊙ for the primary, and 1400–1650 K and 0.05–0.07 M⊙ for the wide companion. For the ∼M6 component, we estimated Teff = 2850 ± 200 K and m = 0.10$^{+0.06}_{-0.01}$ M⊙.
B Gauza; V J S Béjar; A Pérez-Garrido; N Lodieu; R Rebolo; María Rosa Zapatero Osorio; B Pantoja; S Velasco; J S Jenkins. A low-mass triple system with a wide L/T transition brown dwarf component: NLTT 51469AB/SDSS 2131−0119. Monthly Notices of the Royal Astronomical Society 2019, 487, 1149 -1159.
AMA StyleB Gauza, V J S Béjar, A Pérez-Garrido, N Lodieu, R Rebolo, María Rosa Zapatero Osorio, B Pantoja, S Velasco, J S Jenkins. A low-mass triple system with a wide L/T transition brown dwarf component: NLTT 51469AB/SDSS 2131−0119. Monthly Notices of the Royal Astronomical Society. 2019; 487 (1):1149-1159.
Chicago/Turabian StyleB Gauza; V J S Béjar; A Pérez-Garrido; N Lodieu; R Rebolo; María Rosa Zapatero Osorio; B Pantoja; S Velasco; J S Jenkins. 2019. "A low-mass triple system with a wide L/T transition brown dwarf component: NLTT 51469AB/SDSS 2131−0119." Monthly Notices of the Royal Astronomical Society 487, no. 1: 1149-1159.
Aims. Our scientific goal is to provide a 3D map of the nearest open cluster to the Sun, the Hyades, combining the recent release of Gaia astrometric data, ground-based parallaxes of sub-stellar member candidates and photometric data from surveys which cover large areas of the cluster. Methods. We combined the second Gaia release with ground-based H-band parallaxes obtained with the infrared camera on the 2 m robotic Liverpool telescope to astrometrically identify stellar and sub-stellar members of the Hyades, the nearest open cluster to the Sun. Results. We find 1764 objects within 70° radius from the cluster centre from the Gaia second data release, whose kinematic properties are consistent with the Hyades. We limit our study to 30 pc from the cluster centre (47.03 ± 0.20 pc) where we identify 710 candidate members, including 85 and 385 in the core and tidal radius, respectively. We determine proper motions and parallaxes of eight candidate brown dwarf members and confirm their membership. Using the 3D positions and a model-based mass-luminosity relation we derive a luminosity and mass function in the 0.04–2.5 M⊙ range. We confirm evidence for mass segregation in the Hyades and find a dearth of brown dwarfs in the core of the cluster. From the white dwarf members we estimate an age of 640−49+67 Myr. Conclusions. We identify a list of members in the Hyades cluster from the most massive stars down to the brown dwarfs. We produce for the first time a 3D map of the Hyades cluster in the stellar and sub-stellar regimes and make available the list of candidate members.
N. Lodieu; R. L. Smart; Antonio Perez-Garrido; Roberto Silvotti. A 3D view of the Hyades stellar and sub-stellar population. Astronomy & Astrophysics 2019, 623, A35 .
AMA StyleN. Lodieu, R. L. Smart, Antonio Perez-Garrido, Roberto Silvotti. A 3D view of the Hyades stellar and sub-stellar population. Astronomy & Astrophysics. 2019; 623 ():A35.
Chicago/Turabian StyleN. Lodieu; R. L. Smart; Antonio Perez-Garrido; Roberto Silvotti. 2019. "A 3D view of the Hyades stellar and sub-stellar population." Astronomy & Astrophysics 623, no. : A35.
Nicolas Lodieu; Patricia Chinchilla; María Teresa Ruiz; Antonio Perez-Garrido; Víctor J. S. Béjar; Bartosz Gauza; María Rosa Zapatero Osorio; Rafael Rebolo. Near-infrared Spectroscopy of Three Nearby L Dwarfs. Research Notes of the AAS 2019, 3, 30 .
AMA StyleNicolas Lodieu, Patricia Chinchilla, María Teresa Ruiz, Antonio Perez-Garrido, Víctor J. S. Béjar, Bartosz Gauza, María Rosa Zapatero Osorio, Rafael Rebolo. Near-infrared Spectroscopy of Three Nearby L Dwarfs. Research Notes of the AAS. 2019; 3 (2):30.
Chicago/Turabian StyleNicolas Lodieu; Patricia Chinchilla; María Teresa Ruiz; Antonio Perez-Garrido; Víctor J. S. Béjar; Bartosz Gauza; María Rosa Zapatero Osorio; Rafael Rebolo. 2019. "Near-infrared Spectroscopy of Three Nearby L Dwarfs." Research Notes of the AAS 3, no. 2: 30.
Our scientific goal is to provide a 3D map of the nearest open cluster to the Sun, the Hyades, combining the recent release of Gaia astrometric data, ground-based parallaxes of sub-stellar member candidates and photometric data from surveys which cover large areas of the cluster. We combined the second Gaia release with ground-based H-band parallaxes obtained with the infrared camera on the 2-m robotic Liverpool telescope to astrometrically identify stellar and sub-stellar members of the Hyades, the nearest open cluster to the Sun. We find 1764 objects within 70 degree radius from the cluster center from the Gaia second data release, whose kinematic properties are consistent with the Hyades. We limit our study to 30 pc from the cluster center (47.03+/-0.20 pc) where we identify 710 candidate members, including 85 and 385 in the core and tidal radius, respectively. We determine proper motions and parallaxes of eight candidate brown dwarf members and confirm their membership. Using the 3D positions and a model-based mass-luminosity relation we derive a luminosity and mass function in the 0.04 to 2.5 Msun range. We confirm evidence for mass segregation in the Hyades and find a dearth of brown dwarfs in the core of the cluster. From the white dwarf members we estimate an age of 640$^{+67}_{-49}$ Myr. We identify a list of members in the Hyades cluster from the most massive stars down to the brown dwarfs. We produce for the first time a 3D map of the Hyades cluster in the stellar and sub-stellar regimes and make available the list of candidate members.
N. Lodieu; R. L. Smart; A. Perez-Garrido; R. Silvotti. A 3D view of the Hyades stellar and sub-stellar population. 2019, 1 .
AMA StyleN. Lodieu, R. L. Smart, A. Perez-Garrido, R. Silvotti. A 3D view of the Hyades stellar and sub-stellar population. . 2019; ():1.
Chicago/Turabian StyleN. Lodieu; R. L. Smart; A. Perez-Garrido; R. Silvotti. 2019. "A 3D view of the Hyades stellar and sub-stellar population." , no. : 1.
Aims. Our aim is to identify substellar members of the nearby Hyades open star cluster to determine the photometric and spectroscopic properties of brown dwarfs at moderately old ages and extend our knowledge of the substellar mass function of the cluster. Methods. We cross-matched the 2MASS and WISE public catalogues and measured proper motions to identify low-mass stars and brown dwarf member candidates in an area of a radius of ten degrees around the central region of the Hyades cluster. We employed astrometric and photometric criteria, Gaia data, and a maximum likelihood method developed by our group to estimate distances. We selected 36 objects that are candidate Hyades members, 21 of which have not been reported previously. Results. We have identified 21 new Hyades member candidates that are placed at the lower end of the main sequence. The photometry of 9 candidates places them in the substellar regime, and 2 are at the L/T transition. We also recovered a number of L dwarfs from earlier surveys. Finally, we calculated the mass function for the low-mass population of the cluster and found that the Hyades cluster might have lost 60%–80% of its substellar members.
A. Pérez-Garrido; N. Lodieu; R. Rebolo; P. Chinchilla. Exploring the substellar population in the Hyades open cluster. Astronomy & Astrophysics 2018, 620, A130 .
AMA StyleA. Pérez-Garrido, N. Lodieu, R. Rebolo, P. Chinchilla. Exploring the substellar population in the Hyades open cluster. Astronomy & Astrophysics. 2018; 620 ():A130.
Chicago/Turabian StyleA. Pérez-Garrido; N. Lodieu; R. Rebolo; P. Chinchilla. 2018. "Exploring the substellar population in the Hyades open cluster." Astronomy & Astrophysics 620, no. : A130.
The detection of faint stellar companions requires high contrast techniques such as coronagraphy. To achieve such high contrast coronagraphs must work with the aid of adaptive optics or be mounted on space telescopes. We propose a new coronagraphic technique that consists of the digital processing of non-coronagraphic images. The only requirement is a priori knowledge of the telescope amplitude point spread function. This digital coronagraph algorithm presents the advantage that it avoids problems associated with manufacture, implementation, and alignment of optical coronagraphs. The digital coronagraph algorithm is successfully checked with laboratory generated images. Moreover, numerical simulations show that the digital coronagraph presents contrast curves similar to that of the optical coronagraph. Finally, speckle noise can be cancelled out as effectively as in optical coronagraphs.
Pedro J. Valle; Antonio Fuentes; Vidal F. Canales; Miguel A. Cagigas; Villó Pérez; Manuel P. Cagigal. Digital coronagraph algorithm. OSA Continuum 2018, 1, 625 -633.
AMA StylePedro J. Valle, Antonio Fuentes, Vidal F. Canales, Miguel A. Cagigas, Villó Pérez, Manuel P. Cagigal. Digital coronagraph algorithm. OSA Continuum. 2018; 1 (2):625-633.
Chicago/Turabian StylePedro J. Valle; Antonio Fuentes; Vidal F. Canales; Miguel A. Cagigas; Villó Pérez; Manuel P. Cagigal. 2018. "Digital coronagraph algorithm." OSA Continuum 1, no. 2: 625-633.
Aims. From the luminosity, effective temperature and age of the Hyades brown dwarf 2MASS J04183483+2131275 (2M0418), substellar evolutionary models predict a mass in the range 39−55 Jupiter masses (MJup) which is insufficient to produce any substantial lithium burning except for the very upper range >53 MJup. Our goal is to measure the abundance of lithium in this object, test the consistency between models and observations and refine constraints on the mass and age of the object. Methods. We used the 10.4-m Gran Telescopio Canarias (GTC) with its low-dispersion optical spectrograph to obtain ten spectra of 2277 s each covering the range 6300–10 300 Å with a resolving power of R ~ 500. Results. In the individual spectra, which span several months, we detect persistent unresolved Hα in emission with pseudo equivalent widths (pEW) in the range 45–150 Å and absorption lines of various alkalis with the typical strengths found in objects of L5 spectral type. The lithium resonance line at 6707.8 Å is detected with pEW of 18 ± 4 Å in 2M0418 (L5). Conclusions. We determine a lithium abundance of log N(Li) = 3.0 ± 0.4 dex consistent with a minimum preservation of 90% of this element which confirms 2M0418 as a brown dwarf with a maximum mass of 52 MJup. We infer a maximum age for the Hyades of 775 Myr from a comparison with the BHAC15 models. Combining recent results from the literature with our study, we constrain the mass of 2M0418 to 45–52 MJup and the age of the cluster to 580–775 Myr (1σ) based on the lithium depletion boundary method.
N. Lodieu; R. Rebolo; A. Pérez-Garrido. Lithium in the Hyades L5 brown dwarf 2MASS J04183483+2131275. Astronomy & Astrophysics 2018, 615, L12 .
AMA StyleN. Lodieu, R. Rebolo, A. Pérez-Garrido. Lithium in the Hyades L5 brown dwarf 2MASS J04183483+2131275. Astronomy & Astrophysics. 2018; 615 ():L12.
Chicago/Turabian StyleN. Lodieu; R. Rebolo; A. Pérez-Garrido. 2018. "Lithium in the Hyades L5 brown dwarf 2MASS J04183483+2131275." Astronomy & Astrophysics 615, no. : L12.
Here we present the Adaptive Optics Lucky Imager (AOLI), a state-of-the-art instrument which makes use of two well proved techniques, Lucky Imaging (LI) and Adaptive Optics (AO), to deliver diffraction limited imaging at visible wavelengths, 20 mas, from ground-based telescopes. Thanks to its revolutionary TP3-WFS, AOLI shall have the capability of using faint reference stars. In the extremely-big telescopes era, the combination of techniques and the development of new WFS systems seems the clue key for success. We give details of the integration and verification phases explaining the defiance that we have faced and the innovative and versatile solutions for each of its subsystems that we have developed, providing also very fresh results after its first fully-working observing run at the William Herschel Telescope (WHT).
Carlos Colodro-Conde; Roberto López López; Alejandro Oscoz; Rafael Rebolo-López; Lucas Labadie; Yolanda Martín-Hernando; Antonio Pérez-Garrido; Sergio Velasco Muñoz; Craig Mackay. The adaptive optics lucky imager (AOLI): presentation, commissioning, and AIV innovations. Adaptive Optics Systems VI 2018, 10703, 1070361 .
AMA StyleCarlos Colodro-Conde, Roberto López López, Alejandro Oscoz, Rafael Rebolo-López, Lucas Labadie, Yolanda Martín-Hernando, Antonio Pérez-Garrido, Sergio Velasco Muñoz, Craig Mackay. The adaptive optics lucky imager (AOLI): presentation, commissioning, and AIV innovations. Adaptive Optics Systems VI. 2018; 10703 ():1070361.
Chicago/Turabian StyleCarlos Colodro-Conde; Roberto López López; Alejandro Oscoz; Rafael Rebolo-López; Lucas Labadie; Yolanda Martín-Hernando; Antonio Pérez-Garrido; Sergio Velasco Muñoz; Craig Mackay. 2018. "The adaptive optics lucky imager (AOLI): presentation, commissioning, and AIV innovations." Adaptive Optics Systems VI 10703, no. : 1070361.
N. Lodieu; R. Rebolo; A. Perez-Garrido. Lithium in the Hyades L5 brown dwarf 2MASSJ04183483+2131275. 2018, 1 .
AMA StyleN. Lodieu, R. Rebolo, A. Perez-Garrido. Lithium in the Hyades L5 brown dwarf 2MASSJ04183483+2131275. . 2018; ():1.
Chicago/Turabian StyleN. Lodieu; R. Rebolo; A. Perez-Garrido. 2018. "Lithium in the Hyades L5 brown dwarf 2MASSJ04183483+2131275." , no. : 1.
Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics
Antonio Perez-Garrido; N. Lodieu; Rafael Rebolo. A new L5 brown dwarf member of the Hyades cluster with chromospheric activity. Astronomy & Astrophysics 2017, 599, A78 .
AMA StyleAntonio Perez-Garrido, N. Lodieu, Rafael Rebolo. A new L5 brown dwarf member of the Hyades cluster with chromospheric activity. Astronomy & Astrophysics. 2017; 599 ():A78.
Chicago/Turabian StyleAntonio Perez-Garrido; N. Lodieu; Rafael Rebolo. 2017. "A new L5 brown dwarf member of the Hyades cluster with chromospheric activity." Astronomy & Astrophysics 599, no. : A78.
Adaptive Optics Lucky Imager (AOLI) is a state-of-the-art instrument that combines adaptive optics (AO) and lucky imaging (LI) with the objective of obtaining diffraction-limited images in visible wavelength at mid- and big-size ground-based telescopes. The key innovation of AOLI is the development and use of the new Two Pupil Plane Positions Wavefront Sensor (TP3-WFS). The TP3-WFS, working in visible band, represents an advance over classical wavefront sensors such as the Shack-Hartmann WFS because it can theoretically use fainter natural reference stars, which would ultimately provide better sky coverages to AO instruments using this newer sensor. This paper describes the software, algorithms and procedures that enabled AOLI to become the first astronomical instrument performing real-time AO corrections in a telescope with this new type of WFS, including the first control-related results at the William Herschel Telescope.
C. Colodro-Conde; S. Velasco; J. J. Fernández-Valdivia; R. López; A. Oscoz; Rafael Rebolo; B. Femenía; D. L. King; L. Labadie; C. Mackay; B. Muthusubramanian; Antonio Perez-Garrido; M. Puga; G. Rodríguez-Coira; L. F. Rodríguez-Ramos; R. Toledo-Moreo; Villó Pérez. Laboratory and telescope demonstration of the TP3-WFS for the adaptive optics segment of AOLI. Monthly Notices of the Royal Astronomical Society 2017, 467, 2855 -2868.
AMA StyleC. Colodro-Conde, S. Velasco, J. J. Fernández-Valdivia, R. López, A. Oscoz, Rafael Rebolo, B. Femenía, D. L. King, L. Labadie, C. Mackay, B. Muthusubramanian, Antonio Perez-Garrido, M. Puga, G. Rodríguez-Coira, L. F. Rodríguez-Ramos, R. Toledo-Moreo, Villó Pérez. Laboratory and telescope demonstration of the TP3-WFS for the adaptive optics segment of AOLI. Monthly Notices of the Royal Astronomical Society. 2017; 467 (3):2855-2868.
Chicago/Turabian StyleC. Colodro-Conde; S. Velasco; J. J. Fernández-Valdivia; R. López; A. Oscoz; Rafael Rebolo; B. Femenía; D. L. King; L. Labadie; C. Mackay; B. Muthusubramanian; Antonio Perez-Garrido; M. Puga; G. Rodríguez-Coira; L. F. Rodríguez-Ramos; R. Toledo-Moreo; Villó Pérez. 2017. "Laboratory and telescope demonstration of the TP3-WFS for the adaptive optics segment of AOLI." Monthly Notices of the Royal Astronomical Society 467, no. 3: 2855-2868.
AOLI (Adaptive Optics Lucky Imager) is a state-of-art instrument that combines adaptive optics (AO) and lucky imaging (LI) with the objective of obtaining diffraction limited images in visible wavelength at mid- and big-size ground-based telescopes. The key innovation of AOLI is the development and use of the new TP3-WFS (Two Pupil Plane Positions Wavefront Sensor). The TP3-WFS, working in visible band, represents an advance over classical wavefront sensors such as the Shack-Hartmann WFS (SH-WFS) because it can theoretically use fainter natural reference stars, which would ultimately provide better sky coverages to AO instruments using this newer sensor. This paper describes the software, algorithms and procedures that enabled AOLI to become the first astronomical instrument performing real-time adaptive optics corrections in a telescope with this new type of WFS, including the first control-related results at the William Herschel Telescope (WHT).
C. Colodro-Conde; S. Velasco; J. J. F. Valdivia; R. L. López; A. Oscoz; R. Rebolo; B. Femenia; D. L. King; L. Labadie; C. Mackay; B. Muthusubramanian; A. Pérez Garrido; M. Puga; G. Rodriguez-Coira; L. F. Rodríguez-Ramos; J. M. Rodríguez-Ramos; R. Toledo-Moreo; I. Villó-Pérez. Laboratory and telescope demonstration of the TP3-WFS for the adaptive optics segment of AOLI. 2017, 1 .
AMA StyleC. Colodro-Conde, S. Velasco, J. J. F. Valdivia, R. L. López, A. Oscoz, R. Rebolo, B. Femenia, D. L. King, L. Labadie, C. Mackay, B. Muthusubramanian, A. Pérez Garrido, M. Puga, G. Rodriguez-Coira, L. F. Rodríguez-Ramos, J. M. Rodríguez-Ramos, R. Toledo-Moreo, I. Villó-Pérez. Laboratory and telescope demonstration of the TP3-WFS for the adaptive optics segment of AOLI. . 2017; ():1.
Chicago/Turabian StyleC. Colodro-Conde; S. Velasco; J. J. F. Valdivia; R. L. López; A. Oscoz; R. Rebolo; B. Femenia; D. L. King; L. Labadie; C. Mackay; B. Muthusubramanian; A. Pérez Garrido; M. Puga; G. Rodriguez-Coira; L. F. Rodríguez-Ramos; J. M. Rodríguez-Ramos; R. Toledo-Moreo; I. Villó-Pérez. 2017. "Laboratory and telescope demonstration of the TP3-WFS for the adaptive optics segment of AOLI." , no. : 1.
Carlos Colodro-Conde; Sergio Velasco; Roberto Lã³Pez; Alejandro Oscoz; Yolanda Martãn-Hernando; Rafael Rebolo; Antonio Pã©Rez-Garrido; Juan Josã© Ferrã¡ndez-Valdivia; Lucas Labadie; Craig Mackay; Marta Puga; Gustavo Rodrãguez-Coira; Luis Fernando Rodrãguez-Ramos; Josã© Manuel Rodrãguez-Ramos; Roberto Lopez Lopez; Yolanda Martín-Hernando; Antonio Perez-Garrido; Juan José Ferrández-Valdivia; Gustavo Rodríguez-Coira; Luis Fernando Rodríguez-Ramos; José Manuel Rodríguez-Ramos. The TP3-WFS: a new guy in town. Proceedings of the Adaptive Optics for Extremely Large Telescopes 5 2017, 1 .
AMA StyleCarlos Colodro-Conde, Sergio Velasco, Roberto Lã³Pez, Alejandro Oscoz, Yolanda Martãn-Hernando, Rafael Rebolo, Antonio Pã©Rez-Garrido, Juan Josã© Ferrã¡ndez-Valdivia, Lucas Labadie, Craig Mackay, Marta Puga, Gustavo Rodrãguez-Coira, Luis Fernando Rodrãguez-Ramos, Josã© Manuel Rodrãguez-Ramos, Roberto Lopez Lopez, Yolanda Martín-Hernando, Antonio Perez-Garrido, Juan José Ferrández-Valdivia, Gustavo Rodríguez-Coira, Luis Fernando Rodríguez-Ramos, José Manuel Rodríguez-Ramos. The TP3-WFS: a new guy in town. Proceedings of the Adaptive Optics for Extremely Large Telescopes 5. 2017; ():1.
Chicago/Turabian StyleCarlos Colodro-Conde; Sergio Velasco; Roberto Lã³Pez; Alejandro Oscoz; Yolanda Martãn-Hernando; Rafael Rebolo; Antonio Pã©Rez-Garrido; Juan Josã© Ferrã¡ndez-Valdivia; Lucas Labadie; Craig Mackay; Marta Puga; Gustavo Rodrãguez-Coira; Luis Fernando Rodrãguez-Ramos; Josã© Manuel Rodrãguez-Ramos; Roberto Lopez Lopez; Yolanda Martín-Hernando; Antonio Perez-Garrido; Juan José Ferrández-Valdivia; Gustavo Rodríguez-Coira; Luis Fernando Rodríguez-Ramos; José Manuel Rodríguez-Ramos. 2017. "The TP3-WFS: a new guy in town." Proceedings of the Adaptive Optics for Extremely Large Telescopes 5 , no. : 1.
The covariance of ground-based Lucky Images (COELI) is a robust and easy-to-use algorithm that allows us to detect faint companions surrounding a host star. In this paper we analyze the relevance of the number of processed frames, the frames quality, the atmosphere conditions and the detection noise on the companion detectability. This analysis has been carried out using both experimental and computer simulated imaging data. Although the technique allows us the detection of faint companions, the camera detection noise and the use of a limited number of frames reduce the minimum detectable companion intensity to around 1000 times fainter than that of the host star when placed at an angular distance corresponding to the few first Airy rings. The reachable contrast could be even larger when detecting companions with the assistance of an adaptive optics system.
Manuel P. Cagigal; Pedro J. Valle; Miguel A. Cagigas; Villó Pérez; Carlos Colodro-Conde; Christian Ginski; M. Mugrauer; M. Seeliger. Covariance of lucky images: performance analysis. Monthly Notices of the Royal Astronomical Society 2016, 464, 680 -687.
AMA StyleManuel P. Cagigal, Pedro J. Valle, Miguel A. Cagigas, Villó Pérez, Carlos Colodro-Conde, Christian Ginski, M. Mugrauer, M. Seeliger. Covariance of lucky images: performance analysis. Monthly Notices of the Royal Astronomical Society. 2016; 464 (1):680-687.
Chicago/Turabian StyleManuel P. Cagigal; Pedro J. Valle; Miguel A. Cagigas; Villó Pérez; Carlos Colodro-Conde; Christian Ginski; M. Mugrauer; M. Seeliger. 2016. "Covariance of lucky images: performance analysis." Monthly Notices of the Royal Astronomical Society 464, no. 1: 680-687.
Sergio Velasco; Urtats Etxegarai; Alejandro Oscoz; Roberto L. López; Marta Puga; Gaizka Murga; Antonio Pérez-Garrido; Enric Pallé; Davide Ricci; Ismael Ayuso; Mónica Hernández-Sánchez; Nicola Truant. Commissioning and first observations with Wide FastCam at the Telescopio Carlos Sánchez. Ground-based and Airborne Instrumentation for Astronomy VI 2016, 99082O -99082O-7.
AMA StyleSergio Velasco, Urtats Etxegarai, Alejandro Oscoz, Roberto L. López, Marta Puga, Gaizka Murga, Antonio Pérez-Garrido, Enric Pallé, Davide Ricci, Ismael Ayuso, Mónica Hernández-Sánchez, Nicola Truant. Commissioning and first observations with Wide FastCam at the Telescopio Carlos Sánchez. Ground-based and Airborne Instrumentation for Astronomy VI. 2016; ():99082O-99082O-7.
Chicago/Turabian StyleSergio Velasco; Urtats Etxegarai; Alejandro Oscoz; Roberto L. López; Marta Puga; Gaizka Murga; Antonio Pérez-Garrido; Enric Pallé; Davide Ricci; Ismael Ayuso; Mónica Hernández-Sánchez; Nicola Truant. 2016. "Commissioning and first observations with Wide FastCam at the Telescopio Carlos Sánchez." Ground-based and Airborne Instrumentation for Astronomy VI , no. : 99082O-99082O-7.
The combination of Lucky Imaging with a low order adaptive optics system was demonstrated very successfully on the Palomar 5m telescope nearly 10 years ago. It is still the only system to give such high-resolution images in the visible or near infrared on ground-based telescope of faint astronomical targets. The development of AOLI for deployment initially on the WHT 4.2 m telescope in La Palma, Canary Islands, will be described in this paper. In particular, we will look at the design and status of our low order curvature wavefront sensor which has been somewhat simplified to make it more efficient, ensuring coverage over much of the sky with natural guide stars as reference object. AOLI uses optically butted electron multiplying CCDs to give an imaging array of 2000 x 2000 pixels.
Craig Mackay; Rafael Rebolo; David L. King; Lucas Labadie; Marta Puga; Antonio Pérez Garrido; Carlos Colodro-Conde; Roberto L. Lopez; Balaji Muthusubramanian; Alejandro Oscoz; J. Rodríguez Ramos; Luis F. Rodrigo-Ramos; J. J. Fernandez-Valdivia; Sergio Velasco. AOLI: near-diffraction limited imaging in the visible on large ground-based telescopes. Ground-based and Airborne Instrumentation for Astronomy VI 2016, 9908, 99080M .
AMA StyleCraig Mackay, Rafael Rebolo, David L. King, Lucas Labadie, Marta Puga, Antonio Pérez Garrido, Carlos Colodro-Conde, Roberto L. Lopez, Balaji Muthusubramanian, Alejandro Oscoz, J. Rodríguez Ramos, Luis F. Rodrigo-Ramos, J. J. Fernandez-Valdivia, Sergio Velasco. AOLI: near-diffraction limited imaging in the visible on large ground-based telescopes. Ground-based and Airborne Instrumentation for Astronomy VI. 2016; 9908 ():99080M.
Chicago/Turabian StyleCraig Mackay; Rafael Rebolo; David L. King; Lucas Labadie; Marta Puga; Antonio Pérez Garrido; Carlos Colodro-Conde; Roberto L. Lopez; Balaji Muthusubramanian; Alejandro Oscoz; J. Rodríguez Ramos; Luis F. Rodrigo-Ramos; J. J. Fernandez-Valdivia; Sergio Velasco. 2016. "AOLI: near-diffraction limited imaging in the visible on large ground-based telescopes." Ground-based and Airborne Instrumentation for Astronomy VI 9908, no. : 99080M.
Roberto L. López; Sergio Velasco; Carlos Colodro-Conde; Juan J. F. Valdivia; Marta Puga; Alejandro Oscoz; Rafael Rebolo; Craig Mackay; Antonio Pérez-Garrido; Luis Fernando Rodríguez-Ramos; José Manuel M. Rodríguez-Ramos; David King; Lucas Labadie; Balaji Muthusubramanian; Gustavo Rodríguez-Coira. An instrumental puzzle: the modular integration of AOLI. Ground-based and Airborne Instrumentation for Astronomy VI 2016, 99082Z -99082Z-10.
AMA StyleRoberto L. López, Sergio Velasco, Carlos Colodro-Conde, Juan J. F. Valdivia, Marta Puga, Alejandro Oscoz, Rafael Rebolo, Craig Mackay, Antonio Pérez-Garrido, Luis Fernando Rodríguez-Ramos, José Manuel M. Rodríguez-Ramos, David King, Lucas Labadie, Balaji Muthusubramanian, Gustavo Rodríguez-Coira. An instrumental puzzle: the modular integration of AOLI. Ground-based and Airborne Instrumentation for Astronomy VI. 2016; ():99082Z-99082Z-10.
Chicago/Turabian StyleRoberto L. López; Sergio Velasco; Carlos Colodro-Conde; Juan J. F. Valdivia; Marta Puga; Alejandro Oscoz; Rafael Rebolo; Craig Mackay; Antonio Pérez-Garrido; Luis Fernando Rodríguez-Ramos; José Manuel M. Rodríguez-Ramos; David King; Lucas Labadie; Balaji Muthusubramanian; Gustavo Rodríguez-Coira. 2016. "An instrumental puzzle: the modular integration of AOLI." Ground-based and Airborne Instrumentation for Astronomy VI , no. : 99082Z-99082Z-10.