Dr. Olivier Hernandez Profile

Dr. Olivier Hernandez

at L’Institut Trottier de recherche sur les exoplanètes

SPIE Involvement:

Author

Publications (19)

Proceedings Article | 12 July 2018 Presentation + Paper

H4RG characterization for high-resolution infrared spectroscopy

Étienne Artigau, Jonathan Saint-Antoine, Pierre-Luc Lévesque, Philippe Vallée, René Doyon, Olivier Hernandez, Claire Moutou

Proceedings Volume 10709, 107091P (2018) https://doi.org/10.1117/12.2314475

KEYWORDS: Sensors, Infrared radiation, Velocimetry, Capacitive coupling, Infrared spectroscopy, Planets

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Proceedings Article | 9 July 2018 Presentation

The near-infrared planet searcher (NIRPS) (Conference Presentation)

Rene Doyon, François Bouchy, Étienne Artigau, Olivier Hernandez, François Wildi, Claudio Melo, Philippe Vallée, Simon Thibault, Xavier Delfosse, Christophe Lovis, Francesco Pepe, Pedro Figueira, Vladimir Reshetov, Nuno Santos, Lison Malo, Mathieu Ouellet, Denis Brousseau, Rafael Rebolo-López, Nicolas Blind, Uriel Condo, Stéphane Dry, Jonay González Hernández, Bruno Chazelas, Bruno Canto Martins, Jose de Medeiros

Proceedings Volume 10702, 1070210 (2018) https://doi.org/10.1117/12.2313050

KEYWORDS: Planets, Infrared telescopes, Infrared radiation, Spectrographs, Telescopes, Lanthanum

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Proceedings Article | 1 September 2017 Paper

NIRPS: an adaptive-optics assisted radial velocity spectrograph to chase exoplanets around M-stars

F. Wildi, N. Blind, V. Reshetov, O. Hernandez, L. Genolet, U. Conod, M. Sordet, A. Segovilla, J. L. Rasilla, D. Brousseau, S. Thibault, B. Delabre, T. Bandy, M. Sarajlic, A. Cabral, S. Bovay, Ph. Vallée, F. Bouchy, R. Doyon, E. Artigau, F. Pepe, J. Hagelberg, C. Melo, X. Delfosse, P. Figueira, N. C. Santos, J. I. González Hernández, J. R. de Medeiros, R. Rebolo, Ch. Broeg, W. Benz, I. Boisse, L. Malo, U. Käufl, L. Saddlemyer

Proceedings Volume 10400, 1040018 (2017) https://doi.org/10.1117/12.2275660

KEYWORDS: Spectrographs, Adaptive optics, Planets, Exoplanets, Velocity measurements, Stars, Spectroscopy, Optical fibers, Space operations, Interference (communication)

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Since 1st light in 2002, HARPS has been setting the standard in the exo-planet detection by radial velocity (RV) measurements[1]. Based on this experience, our consortium is developing a high accuracy near-infrared RV spectrograph covering YJH bands to detect and characterize low-mass planets in the habitable zone of M dwarfs. It will allow RV measurements at the 1-m/s level and will look for habitable planets around M- type stars by following up the candidates found by the upcoming space missions TESS, CHEOPS and later PLATO. NIRPS and HARPS, working simultaneously on the ESO 3.6m are bound to become a single powerful high-resolution, high-fidelity spectrograph covering from 0.4 to 1.8 micron. NIRPS will complement HARPS in validating earth-like planets found around G and K-type stars whose signal is at the same order of magnitude than the stellar noise. Because at equal resolving power the overall dimensions of a spectrograph vary linearly with the input beam étendue, spectrograph designed for seeing-limited observations are large and expensive. NIRPS will use a high order adaptive optics system to couple the starlight into a fiber corresponding to 0.4” on the sky as efficiently or better than HARPS or ESPRESSO couple the light 0.9” fiber. This allows the spectrograph to be very compact, more thermally stable and less costly. Using a custom tan(θ)=4 dispersion grating in combination with a start-of-the-art Hawaii4RG detector makes NIRPS very efficient with complete coverage of the YJH bands at 110’000 resolution. NIRPS works in a regime that is in-between the usual multi-mode (MM) where 1000’s of modes propagates in the fiber and the single mode well suited for perfect optical systems. This regime called few-modes regime is prone to modal noise- Results from a significant R and D effort made to characterize and circumvent the modal noise show that this contribution to the performance budget shall not preclude the RV performance to be achieved.

Proceedings Article | 29 July 2016 Paper

First light of the NIRISS Optical Simulator (NOS)

Jonathan St-Antoine, Loïc Albert, René Doyon, Philippe Vallée, Étienne Artigau, Olivier Hernandez, Simon Thibault, Denis Brousseau

Proceedings Volume 9904, 990447 (2016) https://doi.org/10.1117/12.2232050

KEYWORDS: Device simulation, James Webb Space Telescope, Exoplanets, Optical simulations, Absorption, Device simulation, James Webb Space Telescope, Sensors, Spectroscopy, Cadmium sulfide, Laser sources, Stars

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Proceedings Article | 28 July 2014 Paper

POMM: design of rotating mechanism and hexapod structure

Patrice Côté, Mélanie Leclerc, Mathieu Demers, Pierre Bastien, Olivier Hernandez

Proceedings Volume 9147, 91472Q (2014) https://doi.org/10.1117/12.2056991

KEYWORDS: Computer programming, Prisms, Stars, Telescopes, Adhesives, Finite element methods, Polarization, Sensors, Interfaces, Polarimetry

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The new high precision polarimeter for the “Observatoire du Mont Mégantic” (POMM) is an instrument designed to observe exoplanets and other targets in the visible and near infrared wavebands. The requirements to achieve these observation goals are posing unusual challenges to structural and mechanical designers. In this paper, the detailed design, analysis and laboratory results of the key mechanical structure and sub-systems are presented. First, to study extremely low polarization, the birefringence effect due to stresses in the optical elements must be kept to the lowest possible values. The double-wedge Wollaston custom prism assembly that splits the incoming optical beam is made of bonded α-BBO to N-BK-7 glass lenses. Because of the large mismatch of coefficients of thermal expansion and temperatures as low as -40°C that can be encountered at Mont-Mégantic observatory, a finite element analysis (FEA) model is developed to find the best adhesive system to minimize stresses. Another critical aspect discussed in details is the implementation of the cascaded rotating elements and the twin rotating stages. Special attention is given to the drive mechanism and encoding technology. The objective was to reach high absolute positional accuracy in rotation without any mechanical backlash. As for many other instruments, mass, size and dimensional stability are important critera for the supporting structure. For a cantilevered device, such as POMM, a static hexapod is an attractive solution because of the high stiffness to weight ratio. However, the mechanical analysis revealed that the specific geometry of the dual channel optical layout also added an off-axis counterbalancing problem. To reach an X-Y displacement error on the detector smaller than 35μm for 0-45° zenith angle, further structural optimization was done using FEA. An imaging camera was placed at the detector plane during assembly to measure the actual optical beam shift under varying gravitational loading.

Proceedings Article | 28 July 2014 Paper

Optical, mechanical and electronic design and integration of POMM, a polarimeter for the Observatoire du mont Mégantic

Melanie Leclerc, Patrice Côté, François Duchesne, Pierre Bastien, Olivier Hernandez, Pierre Colonna d'Istria, Mathieu Demers, Marc Girard, Maxime Savard, Dany Lemieux, Simon Thibault, Denis Brousseau

Proceedings Volume 9147, 91472D (2014) https://doi.org/10.1117/12.2054773

KEYWORDS: Stars, Telescopes, Avalanche photodetectors, Polarization, Polarimetry, Optical amplifiers, Prisms, Mechanical engineering, Signal detection, Error analysis

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Proceedings Article | 23 July 2014 Paper

Development of a 4kx4k frame transfer electron multiplying CCD for scientific applications

Jean-Luc Gach, Claude Carignan, Olivier Hernandez, Paul Jorden, Douglas Jordan, Philippe Balard, Philippe Vallée, Philippe Amram, Michel Marcelin, Benoit Epinat

Proceedings Volume 9154, 91540A (2014) https://doi.org/10.1117/12.2057021

KEYWORDS: Clocks, Charge-coupled devices, Electron multiplying charge coupled devices, Photon counting, Sensors, CCD image sensors, Telescopes, Fabry–Perot interferometers, Astronomy, Fabry–Perot interferometry

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Proceedings Article | 8 July 2014 Paper

High-precision polarimetry at the Mont-Mégantic Observatory with the new polarimeter POMM

Pierre Bastien, Olivier Hernandez, Loïc Albert, Étienne Artigau, René Doyon, Laurent Drissen, David Lafrenière, Antony Moffat, Nicole St-Louis

Proceedings Volume 9147, 91471S (2014) https://doi.org/10.1117/12.2056789

KEYWORDS: Stars, Polarization, Polarimetry, Planets, Light scattering, Exoplanets, Scattering, Jupiter, Comets, Observatories

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Proceedings Article | 8 July 2014 Paper

SPIRou: the near-infrared spectropolarimeter/high-precision velocimeter for the Canada-France-Hawaii telescope

Étienne Artigau, Driss Kouach, Jean-François Donati, René Doyon, Xavier Delfosse, Sébastien Baratchart, Marielle Lacombe, Claire Moutou, Patrick Rabou, Laurent Parès, Yoan Micheau, Simon Thibault, Vladimir Reshetov, Bruno Dubois, Olivier Hernandez, Philippe Vallée, Shiang-Yu Wang, François Dolon, Francesco Pepe, François Bouchy, Nicolas Striebig, François Hénault, David Loop, Leslie Saddlemyer, Gregory Barrick, Tom Vermeulen, Michel Dupieux, Guillaume Hébrard, Isabelle Boisse, Eder Martioli, Silvia Alencar, José-Diaz do Nascimento, Pedro Figueira

Proceedings Volume 9147, 914715 (2014) https://doi.org/10.1117/12.2055663

KEYWORDS: Calibration, Mirrors, Planets, Stars, Spectrographs, Polarimetry, Prisms, Telescopes, Collimation, Cameras

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Proceedings Article | 24 September 2012 Paper

SPIRou @ CFHT: design of the instrument control system

Gregory Barrick, Tom Vermeulen, Sébastien Baratchart, Vladimir Reshetov, Shiang-Yu Wang, François Dolon, Olivier Hernandez, Francesco Pepe, François Bouchy, Jennifer Dunn, Michel Dupieux, Gérard Gallou, Marie Larrieu, Alexandre Fonteneau, François Moreau, François Wildi, Laurent Parès, James Thomas, Chi-Hung Yan, René Doyon, Jean-François Donati, Philippe Vallée, Étienne Artigau, Xavier Delfosse, Patrick Rabou, Simon Thibault, Driss Kouach, David Loop

Proceedings Volume 8451, 84513J (2012) https://doi.org/10.1117/12.926392

KEYWORDS: Stars, Calibration, Control systems, Telescopes, Spectrographs, Sensors, Control systems design, Temperature metrology, Optical benches, Lamps

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Proceedings Article | 24 September 2012 Paper

SPIRou @ CFHT: data reduction software and simulation tools

Étienne Artigau, François Bouchy, Xavier Delfosse, Xavier Bonfils, Jean-François Donati, Pedro Figueira, Karun Thanjavur, David Lafrenière, René Doyon, Christian Surace, Claire Moutou, Isabelle Boisse, Leslie Saddlemyer, David Loop, Driss Kouach, Francesco Pepe, Christophe Lovis, Olivier Hernandez, Shiang-Yu Wang

Proceedings Volume 8451, 84513I (2012) https://doi.org/10.1117/12.926334

KEYWORDS: Sensors, Calibration, Absorption, Device simulation, Error analysis, Image segmentation, Telescopes, Polarization, Zemax, Spectrographs

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Proceedings Article | 24 September 2012 Paper

SPIRou @ CFHT: spectrograph optical design

Simon Thibault, Patrick Rabou, Jean-Francois Donati, Pierre Desaulniers, Xavier Dallaire, Etienne Artigau, Francesco Pepe, Yoan Micheau, Philippe Vallée, Greg Barrick, Vlad Reshetov, Olivier Hernandez, Leslie Saddlemyer, John Pazder, Laurent Parès, Rene Doyon, Xavier Delfosse, Driss Kouach, David Loop

Proceedings Volume 8446, 844630 (2012) https://doi.org/10.1117/12.926697

KEYWORDS: Spectrographs, Sensors, Optical design, Prisms, Mirrors, Cameras, Control systems, Telescopes, Collimation, Image resolution

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Proceedings Article | 28 July 2008 Paper

Developing high-performance reflective coatings for the tunable filter and the high-order interferometer of the 3D-NTT

Marie-Maude de Denus-Baillargeon, Laëtitia Abel-Tibérini, Michel Lequime, Claude Carignan, Benoît Épinat, Jean-Luc Gach, Olivier Hernandez, Michel Marcelin

Proceedings Volume 7013, 70133N (2008) https://doi.org/10.1117/12.789498

KEYWORDS: Fabry–Perot interferometers, Reflectivity, Optical coatings, Lawrencium, Tunable filters, Reflection, Refractive index, Silver, Interferometers, Control systems

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Proceedings Article | 11 July 2008 Paper

3D-NTT: a versatile integral field spectro-imager for the NTT

M. Marcelin, P. Amram, P. Balard, C. Balkowski, O. Boissin, J. Boulesteix, C. Carignan, O. Daigle, M.-M. de Denus Baillargeon, B. Epinat, J.-L. Gach, O. Hernandez, F. Rigaud, P. Vallée

Proceedings Volume 7014, 701455 (2008) https://doi.org/10.1117/12.800300

KEYWORDS: Galactic astronomy, Tunable filters, Interferometers, Sensors, Telescopes, Image resolution, Spectral resolution, Fabry–Perot interferometers, Glasses, Visible radiation

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Proceedings Article | 10 July 2008 Paper

GHαFaS: Galaxy Hα Fabry-Perot system for the WHT

Claude Carignan, Olivier Hernandez, Jean-Luc Gach, Philippe Balard, Marie-Maude De Denus-Baillargeon, Kambiz Fathi, John Beckman, Jean Koulidiati

Proceedings Volume 7014, 70145N (2008) https://doi.org/10.1117/12.790616

KEYWORDS: Fabry–Perot interferometers, Galactic astronomy, Charge-coupled devices, Signal to noise ratio, Telescopes, Sensors, Calibration, Cameras, Spectral resolution, Spatial resolution

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Proceedings Article | 9 July 2008 Paper

The Smart Tunable Filter for ELT

Olivier Hernandez, Claude Carignan, Philippe Amram, Sebastien Balis-Ouellette, Benoît Épinat

Proceedings Volume 7014, 701477 (2008) https://doi.org/10.1117/12.787398

KEYWORDS: Tunable filters, Fabry–Perot interferometers, Galactic astronomy, Sensors, Holography, Prototyping, Spectral resolution, Adaptive optics, Spectrographs, Glasses

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Proceedings Article | 30 June 2006 Paper

Wide field spectrograph concepts for the European Extremely Large Telescope

G. Moretto, R. Bacon, J.-G. Cuby, F. Hammer, Philippe Amram, S. Blais-Ouellette, P.-E. Blanc, J. Devriendt, B. Epinat, T. Fusco, P. Jagourel, O. Hernandez, J.-P. Kneib, I. Montilla, B. Neichel, E. Pécontal, E. Prieto, M. Puech

Proceedings Volume 6269, 62692G (2006) https://doi.org/10.1117/12.671548

KEYWORDS: Tunable filters, Galactic astronomy, Spectrographs, Spectral resolution, Telescopes, Large telescopes, Adaptive optics, Holography, Optical filters, Space telescopes

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Proceedings Article | 7 March 2003 Paper

FaNTOmM: Fabry Perot of new technology for the Observatoire du mont Megantic

Olivier Hernandez, Jean-Luc Gach, Claude Carignan, Jacques Boulesteix

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.459893

KEYWORDS: Charge-coupled devices, Digital signal processing, Quantum efficiency, Telescopes, Gallium arsenide, Cameras, Signal to noise ratio, Fabry–Perot interferometers, Image intensifiers

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Proceedings Article | 14 February 2003 Paper

New imaging polarimeter for the Mont-Megantic Observatory

Pierre Bastien, Vincent Ross, Olivier Hernandez

Proceedings Volume 4843, (2003) https://doi.org/10.1117/12.458900

KEYWORDS: Prisms, Polarimetry, Observatories, Mirrors, Sensors, Stars, Wave plates, Telescopes, Polarization, Charge-coupled devices

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Showing 5 of 19 publications

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