25 results on '"Christophe Clergeon"'
Search Results
2. ULTIMATE-Subaru: System performance modeling of GLAO and wide-field NIR instruments
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Yoshito H. Ono, Ichi Tanaka, K. Yanagisawa, Shiang-Yu Wang, Tadayuki Kodama, Yusei Koyama, Yutaka Hayano, Yosuke Minowa, Takashi Hattori, Masayuki Akiyama, Kentaro Motohara, Celine d'Orgeville, Michitoshi Yoshida, Christophe Clergeon, and Francois Rigaut
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Scientific instrument ,Telescope ,Computer simulation ,law ,Computer science ,Near-infrared spectroscopy ,Systems modeling ,Subaru Telescope ,Adaptive optics ,Spectrograph ,law.invention ,Remote sensing - Abstract
ULTIMATE-Subaru is a next large facility instrument project at Subaru telescope. We will develop a 14x14 sq. arcmin wide-field near-infrared (NIR) imager and a multi-object spectrograph with the aid of a ground- layer adaptive optics system (GLAO), which will uniformly improve the seeing by a factor of 2 over a wide field of view up to ~20 arcmin in diameter. We have developed system modeling of the GLAO and wide-field NIR instruments to define the system level requirements flow down from science cases and derive the system performance budgets based on the GLAO end-to-end numerical simulation and optical system models of the telescope and wide-field NIR science instruments. In this paper, we describe the system performance modeling of ULTIMATE-Subaru and present an overview of the requirements flow down.
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- 2020
3. Status of the SCExAO instrument: recent technology upgrades and path to a system-level demonstrator for PSI
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Tomoyuki Kudo, Julien Lozi, Christophe Clergeon, Olivier Guyon, Chrstian Schwab, Theodoros Anagnos, Jared R. Males, Naoshi Murakami, Motohide Tamura, B. Norris, Hideki Takami, Vincent Deo, Takayuki Kotani, Yoshito H. Ono, Ruslan Belikov, Ananya Sahoo, Eduardo Bendek, Yosuke Minowa, N. Jeremy Kasdin, Eugene Pluzhnik, Sébastien Vievard, Peter G. Tuthill, Nemanja Jovanovic, Kevin Barjot, Frantz Martinache, David S. Doelman, Sarah Steiger, Justin Knight, Nick Cvetojevic, Thayne Currie, Michael Ireland, Naruhisa Takato, Sylvestre Lacour, Romain Laugier, Taichi Uyama, Jeffrey Chilcote, Marc-Antoine Martinod, K. Miller, Frans Snik, Jun Hashimoto, Steven P. Bos, Jun Nishikawa, Hajime Kawahara, Alex B. Walter, Benjamin A. Mazin, Masayuki Kuzuhara, Tyler D. Groff, Mamadou N'Diaye, Elsa Huby, Kristina K. Davis, M. Hayashi, Neelay Fruitwala, Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Observatoire de la Côte d'Azur (OCA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Schreiber, L., Schmidt, D., Vernet, E., Schreiber, Laura, Schmidt, Dirk, and Vernet, Elise
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Wavefront ,[PHYS]Physics [physics] ,Computer science ,Segmented mirror ,business.industry ,01 natural sciences ,Exoplanet ,Starlight ,010309 optics ,Real-time Control System ,[SDU]Sciences of the Universe [physics] ,0103 physical sciences ,Subaru Telescope ,Adaptive optics ,business ,Thirty Meter Telescope ,Computer hardware ,ComputingMilieux_MISCELLANEOUS - Abstract
The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is a high-contrast imaging system installed at the 8-m Subaru Telescope on Maunakea, Hawaii. Due to its unique evolving design, SCExAO is both an instrument open for use by the international scientific community, and a testbed validating new technologies, which are critical to future high-contrast imagers on Giant Segmented Mirror Telescopes (GSMTs). Through multiple international collaborations over the years, SCExAO was able to test the most advanced technologies in wavefront sensors, real-time control with GPUs, low-noise high frame rate detectors in the visible and infrared, starlight suppression techniques or photonics technologies. Tools and interfaces were put in place to encourage collaborators to implement their own hardware and algorithms, and test them on-site or remotely, in laboratory conditions or on-sky. We are now commissioning broadband coronagraphs, the Microwave Kinetic Inductance Detector (MKID) Exoplanet Camera (MEC) for high-speed speckle control, as well as a C-RED ONE camera for both polarization differential imaging and IR wavefront sensing. New wavefront control algorithms are also being tested, such as predictive control, multi-camera machine learning sensor fusion, and focal plane wavefront control. We present the status of the SCExAO instrument, with an emphasis on current collaborations and recent technology demonstrations. We also describe upgrades planned for the next few years, which will evolve SCExAO —and the whole suite of instruments on the IR Nasmyth platform of the Subaru Telescope— to become a system-level demonstrator of the Planetary Systems Imager (PSI), the high-contrast instrument for the Thirty Meter Telescope (TMT).
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- 2020
4. Overview of AO activities at Subaru Telescope
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Christophe Clergeon, Etsuko Mieda, Yosuke Minowa, Takashi Hattori, O. Guyon, Julien Lozi, Yoshito H. Ono, and Masayuki Akiyama
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Upgrade ,Computer science ,business.industry ,Control system ,Bimorph ,First light ,Aerospace engineering ,Adaptive optics ,business ,Subaru Telescope - Abstract
Currently, two AO systems are operated at Subaru Telescope: AO188, which is a facility AO system, and SCExAO, which is a PI-type ExAO system operated behind AO188. In the next 5 year, large-scale upgrades are performed on AO188 for improving the AO performance and operation of AO188 and SCExAO and for the technical demonstration toward the future wide-field ULTIMATE-Subaru GLAO system at Subaru and an ExAO system at TMT, PSI. We are planning to upgrade the real-time control system, the LGS system, and bimorph DM. Also, a new NIR WFS, a LTAO WFS unit, and a beam-switching system will be installed into the Nasmyth IR platform. The installation of the LTAO WFS unit is a part of the ULTIMATE-START project, which implement a LTAO mode into AO188 and demonstrates technologies for the ULTIMATE-Subaru GLAO system. ULTIMATE-Subaru project aims at developing a next-generation, wide-field GLAO system and wide-field NIR instruments for Subaru Telescope, whose first light will be in FY2025.
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- 2020
5. ULTIMATE-Subaru: enhancing the Subaru's wide-field capability with GLAO
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Yoshito H. Ono, Christophe Clergeon, Francois Rigaut, Michitoshi Yoshida, Masayuki Akiyama, Yosuke Minowa, Ichi Tanaka, Takashi Hattori, Tadayuki Kodama, Kentaro Motohara, Shiang-Yu Wang, Yusei Koyama, and Celine d'Orgeville
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Physics ,Optics ,Conceptual design ,business.industry ,Near-infrared spectroscopy ,High spatial resolution ,Subaru Telescope ,Adaptive optics ,business ,Image resolution ,Wide field ,Spectrograph - Abstract
ULTIMATE-Subaru is a next large facility instrument project at Subaru telescope. We will develop a 14x14 arcmin2 wide-field near-infrared (1.0-2.5μm) imager and a multi-object spectrograph with the aid of a ground- layer adaptive optics system (GLAO), which will uniformly improve the seeing by a factor of 2 over a wide field of view up to ~20 arcmin in diameter. The expected spatial resolution by the GLAO correction is about 0.2 arcsec FWHM in K-band under moderate seeing conditions at Subaru telescope. ULTIMATE-Subaru will provide a unique capability to realize wide-field and high spatial resolution survey observations in near infrared in the era of TMT. In this paper, we introduce the project overview including the GLAO and near-infrared instrument conceptual design. We also describe the future wide-field strategy at Subaru telescope with ULTIMATE-Subaru together with HSC and PFS.
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- 2020
6. SCExAO, an instrument with a dual purpose: perform cutting-edge science and develop new technologies
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Naruhisa Takato, David S. Doelman, Jeremy Kasdin, Tyler D. Groff, Nour Skaf, Elsa Huby, Mamadou N'Diaye, Jeffrey Chilcote, Ben Mazin, Michael J. Ireland, Frantz Martinache, Nemanja Jovanovic, Thayne Currie, Christophe Clergeon, Hideki Takami, Prashant Pathak, Sean Goebel, Sébastien Vievard, Peter G. Tuthill, Barnaby Norris, Takayuki Kotani, Ananya Sahoo, Tomoyuki Kudo, Nick Cvetojevic, M. Hayashi, Alex B. Walter, Justin Knight, Frans Snik, Olivier Guyon, Hajime Kawahara, Yosuke Minowa, Julien Lozi, Sylvestre Lacour, Motohide Tamura, Subaru Telescope, National Astronomical Observatory of Japan (NAOJ), Wyant College of Optical Sciences [University of Arizona], University of Arizona, National Institutes of Natural Sciences [Tokyo] (NINS), California Institute of Technology (CALTECH), Institute for astronomy [Hilo, Hawaï], University of Hawai'i [Hilo], Graduate University for Advanced Studies [Hayama] (SOKENDAI), Macquarie University, Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), University of California [Santa Barbara] (UCSB), University of California, The University of Tokyo (UTokyo), Australian National University (ANU), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), NASA Goddard Space Flight Center (GSFC), Stanford University, Princeton University, Leiden Observatory [Leiden], Universiteit Leiden [Leiden], Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, Nice, France., Centre National de la Recherche Scientifique (CNRS), Observatoire de la Côte d'Azur (OCA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Close, Laird M., Schreiber, Laura, Schmidt, Dirk, Centre National de la Recherche Scientifique (CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), and COMUE Université Côte d'Azur (2015 - 2019) (COMUE UCA)
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Infrared ,Computer science ,Segmented mirror ,Polarimetry ,FOS: Physical sciences ,7. Clean energy ,01 natural sciences ,law.invention ,010309 optics ,Telescope ,Integral field spectrograph ,Optics ,law ,0103 physical sciences ,Adaptive optics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,010303 astronomy & astrophysics ,Wavefront ,[PHYS]Physics [physics] ,business.industry ,Exoplanet ,[SDU]Sciences of the Universe [physics] ,Subaru Telescope ,business ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is an extremely modular high-contrast instrument installed on the Subaru telescope in Hawaii. SCExAO has a dual purpose. Its position in the northern hemisphere on a 8-meter telescope makes it a prime instrument for the detection and characterization of exoplanets and stellar environments over a large portion of the sky. In addition, SCExAO's unique design makes it the ideal instrument to test innovative technologies and algorithms quickly in a laboratory setup and subsequently deploy them on-sky. SCExAO benefits from a first stage of wavefront correction with the facility adaptive optics AO188, and splits the 600-2400 nm spectrum towards a variety of modules, in visible and near infrared, optimized for a large range of science cases. The integral field spectrograph CHARIS, with its J, H or K-band high-resolution mode or its broadband low-resolution mode, makes SCExAO a prime instrument for exoplanet detection and characterization. Here we report on the recent developments and scientific results of the SCExAO instrument. Recent upgrades were performed on a number of modules, like the visible polarimetric module VAMPIRES, the high-performance infrared coronagraphs, various wavefront control algorithms, as well as the real-time controller of AO188. The newest addition is the 20k-pixel Microwave Kinetic Inductance Detector (MKIDS) Exoplanet Camera (MEC) that will allow for previously unexplored science and technology developments. MEC, coupled with novel photon-counting speckle control, brings SCExAO closer to the final design of future high-contrast instruments optimized for Giant Segmented Mirror Telescopes (GSMTs)., 12 pages, 9 figures, conference proceedings (SPIE Astronomical telescopes and instrumentation 2018)
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- 2018
7. Subaru AO188 upgrade phase 1: integration of the new real-time system
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Hiroshige Yoshida, Sébastien Vievard, Takashi Hattori, Etsuko Mieda, Nour Skaf, Yosuke Minowa, Olivier Guyon, Christophe Clergeon, Yukata Hayano, Julien Lozi, Yoshito Ono, Ananya Sahoo, and Kiaina Schubert
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Loop optimization ,Model predictive control ,Upgrade ,Laser guide star ,Software ,Computer science ,business.industry ,Adaptive optics ,business ,Subaru Telescope ,Real-time operating system ,Computer hardware - Abstract
The AO188 Single Conjugate facility AO system at Subaru Telescope delivers diffraction-limited images in near-IR in natural and laser guide star modes. We have recently started a major upgrade of AO188 to fulfill the high performance requirements of its downstream instruments, including the Subaru Coronagraphic Extreme-AO. The first phase of this upgrade started in 2017 with the integration of a new real time computer (RTC) and real time system (RTS) CACAO(https://github.com/CACAO-org/CACAO), an open-source real-time software for adaptive optics developed collaboratively and used extensively by the SCExAO instrument. This major upgrade will enable loop optimization, predictive control and include diagnosis tools, therefore improving the performance and stability of AO188 and its downstream instrument module. This paper introduces the architecture of the new RTS describing the different steps we followed to adapt CACAO to our AO interfaces and aging hardware, in preparation of our first engineering tests on-sky achieved successfully on July 23rd 2018.
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- 2018
8. The compute and control for adaptive optics (CACAO) real-time control software package
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Frantz Martinache, Sylvain Cetre, Alison Wong, Christophe Clergeon, Arnaud Sevin, Damien Gratadour, Dalal Sukkari, Barnaby Norris, Olivier Guyon, Hatem Ltaief, Julien Bernard, Jared R. Males, Julien Lozi, and Nour Skaf
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Data stream ,Computer science ,business.industry ,Data stream mining ,Modular design ,Supercomputer ,01 natural sciences ,010309 optics ,Software ,Computer architecture ,Shared memory ,Control system ,0103 physical sciences ,business ,010303 astronomy & astrophysics ,Coding (social sciences) - Abstract
The compute and control for adaptive optics (cacao) package is an open-source modular software environment for real-time control of modern adaptive optics system. By leveraging many-core CPU and GPU hardware, it can scale up to meet the demanding computing requirements of current and future high frame rate, high actuator count adaptive optics (AO) systems. cacao’s modular design enables both simple/barebone operation, and complex full-featured AO control systems. cacao’s design is centered on data streams that hold real-time data in shared memory along with a synchronization mechanism for computing processes. Users and programmers can add additional features by coding modules that interact with cacao’s data stream format. We describe cacao’s architecture and its design approach. We show that accurate timing knowledge is key to many of cacao’s advanced operation modes. We discuss current and future development priorities, including support for machine learning to provide real-time optimization of complex AO systems.
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- 2018
9. Current status of the laser guide star upgrade at Subaru Telescope
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Matthew Wung, Yoko Tanaka, Celine d'Orgeville, Christophe Clergeon, Francois Rigaut, Yosuke Minowa, Takashi Hattori, Yutaka Hayano, Yoshito H. Ono, Etsuko Mieda, and Masayuki Akiyama
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business.industry ,Computer science ,Electrical engineering ,Laser ,law.invention ,Telescope ,Laser guide star ,Upgrade ,law ,Relay ,Current (fluid) ,Adaptive optics ,Subaru Telescope ,business - Abstract
We report the current status of the laser guide star upgrade at Subaru Telescope with a new, more powerful TOPTICA/MPBC laser. While we recycle many of our existing components, such as laser launch telescope, we need to design a new mirror-based laser relay system to replace the current fiber-based relay to accommodate the high power beam. The laser unit has been delivered to Subaru office in March 2018 and installed in a testing lab in June 2018. We describe the preliminary design and its requirements and report future plans. This upgrade will not only improve our current adaptive optics system but also be the first step toward the future laser tomography and ground layer adaptive optics system at Subaru Telescope.
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- 2018
10. Subaru Coronagraphic Extreme-AO (SCExAO) wavefront control: current status and ongoing developments
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Frantz Martinache, Olivier Guyon, Nemanja Jovanovic, Ananya Sahoo, Julien Lozi, Nour Skaf, Yosuke Minowa, Christophe Clergeon, Close, Laird M., Schreiber, Laura, and Schmidt, Dirk
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Wavefront ,Computer science ,Wavefront sensor ,01 natural sciences ,Exoplanet ,010309 optics ,Planet ,0103 physical sciences ,Pyramid (image processing) ,Adaptive optics ,Subaru Telescope ,010303 astronomy & astrophysics ,Thirty Meter Telescope ,Remote sensing - Abstract
Exoplanet imaging requires excellent wavefront correction and calibration. At the Subaru telescope this is achieved us- ing the 188-element facility adaptive optics system(AO188) feeding the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument; a multipurpose instrument built to deliver high contrast images of planets and disks around nearby stars. AO188 offers coarse correction while SCExAO performs fine correction and calibration of 1000 modes. The full system achieves 90%Strehl Ratio in H-band and diffraction limited images. A new Real Time Computer allowing higher performance between SCExAO and AO188 is currently implemented. Future upgrades will include a new Pyramid Wavefront Sensor and (64x64) DM to achieve extreme AO correction inside AO188. We are progressing in the development of predictive control and sensor fusion algorithms across the system to improve performance and calibration. With the new upgrades, SCExAO will be able to image giant planets in reflected light with Subaru and validate technologies necessary to image habitable Earth-like planets with the Thirty Meter Telescope (TMT).
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- 2018
11. On-going and future AO activities on Subaru Telescope
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Etsuko Mieda, Yutaka Hayano, Yoshito H. Ono, Christophe Clergeon, Francois Rigaut, Olivier Guyon, Masayuki Akiyama, Julien Lozi, Yosuke Minowa, and Shin Oya
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010308 nuclear & particles physics ,Computer science ,business.industry ,Bimorph ,Wavefront sensor ,01 natural sciences ,Deformable mirror ,Exoplanet ,Optics ,Upgrade ,0103 physical sciences ,Line (text file) ,business ,Subaru Telescope ,Adaptive optics ,010303 astronomy & astrophysics - Abstract
This paper presents the overview of on-going and future adaptive optics (AO) activities at the Subaru telescope on the top of Maunakea in Hawaii. Currently, two AO systems are running at the Subaru telescope: AO188, a facility single-conjugate AO system with a bimorph deformable mirror and a curvature wavefront sensor with 188 elements, and SCExAO, an additional extreme AO system operating behind AO188 and specialized for exoplanet sciences. We recently started AO188 upgrade project to improve its performance for the next 5-10 years, which will also help improving SCExAO performance. These upgrades are in line with a development for the ULTIMATE-Subaru ground layer AO system.
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- 2018
12. A conceptual design study for Subaru ULTIMATE GLAO
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Yoshito Ono, Visa Korkiakoski, Yosuke Minowa, Ichi Tanaka, Yutaka Hayano, Ikuru Iwata, Shiang-Yu Wang, Michitoshi Yoshida, Kentrao Motohara, Francois Rigaut, Yusei Koyama, Takashi Hattori, Masayuki Akiyama, Christophe Clergeon, Celine d'Orgeville, Jordan Davies, Gaston Gausachs, Nicholas Herrald, and Tadayuki Kodama
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business.industry ,Ground layer ,Cassegrain reflector ,Field of view ,Wavefront sensor ,01 natural sciences ,010309 optics ,Conceptual design ,0103 physical sciences ,Performance prediction ,Aerospace engineering ,Adaptive optics ,business ,010303 astronomy & astrophysics ,Spectrograph - Abstract
We report on the conceptual design study done for the Ground Layer Adaptive Optics system of the ULTIMATE-Subaru project. This is an ambitious instrument project, providing GLAO correction in a square field of view of 14 arcmin on a side, aiming to deliver improved seeing at the near infrared wavelength. Its client instruments are an imager and multi-IFU spectrograph at Cassegrain and a Multi-Object spectrograph at Nasmyth. In this paper, we introduce the ULTIMATE-Subaru project overview and its science case and report the results of the GLAO performance prediction based on the numerical simulation and conceptual design of the wavefront sensor system.
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- 2018
13. The Subaru Coronagraphic Extreme Adaptive Optics system: enabling high-contrast imaging on solar-system scales
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Franck Marchis, Naoshi Murakami, Jonas Kühn, Sébastien Vievard, Peter G. Tuthill, Elsa Huby, Yutaka Hayano, Takayuki Kotani, Tomoyuki Kudo, Motohide Tamura, D. Doughty, Jared R. Males, Julien Woillez, Christophe Clergeon, Guy Perrin, Barnaby Norris, Naruhisa Takato, Guillaume Schworer, Olivier Lai, Gaspard Duchêne, Naoshi Baba, Taro Matsuo, Olivier Guyon, Julien Lozi, Frantz Martinache, Jun Nishikawa, Eugene Serabyn, Paul Stewart, Jun-Ichi Morino, Vincent Garrel, Yosuke Minowa, L. Gauchet, Fumika Oshiyama, Laird M. Close, K. Newman, Sylvestre Lacour, Nemanja Jovanovic, Garima Singh, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Thomas Jefferson National Accelerator Facility (Jefferson Lab), Jet Propulsion Laboratory (JPL), California Institute of Technology (CALTECH)-NASA, Sydney Institute for Astronomy (SIfA), The University of Sydney, Department of Physics [Osaka], Osaka University, National Astronomical Observatory of Japan (NAOJ), Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), European Southern Observatory (ESO), NASA-California Institute of Technology (CALTECH), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
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Physics ,Wavefront ,[PHYS]Physics [physics] ,business.industry ,FOS: Physical sciences ,Astronomy and Astrophysics ,Wavefront sensor ,01 natural sciences ,Deformable mirror ,010309 optics ,Interferometry ,Speckle pattern ,Integral field spectrograph ,Optics ,Apodization ,Space and Planetary Science ,0103 physical sciences ,Adaptive optics ,business ,Astrophysics - Instrumentation and Methods for Astrophysics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,010303 astronomy & astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,ComputingMilieux_MISCELLANEOUS - Abstract
The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is a multipurpose high-contrast imaging platform designed for the discovery and detailed characterization of exoplanetary systems and serves as a testbed for high-contrast imaging technologies for ELTs. It is a multi-band instrument which makes use of light from 600 to 2500nm allowing for coronagraphic direct exoplanet imaging of the inner 3 lambda/D from the stellar host. Wavefront sensing and control are key to the operation of SCExAO. A partial correction of low-order modes is provided by Subaru's facility adaptive optics system with the final correction, including high-order modes, implemented downstream by a combination of a visible pyramid wavefront sensor and a 2000-element deformable mirror. The well corrected NIR (y-K bands) wavefronts can then be injected into any of the available coronagraphs, including but not limited to the phase induced amplitude apodization and the vector vortex coronagraphs, both of which offer an inner working angle as low as 1 lambda/D. Non-common path, low-order aberrations are sensed with a coronagraphic low-order wavefront sensor in the infrared (IR). Low noise, high frame rate, NIR detectors allow for active speckle nulling and coherent differential imaging, while the HAWAII 2RG detector in the HiCIAO imager and/or the CHARIS integral field spectrograph (from mid 2016) can take deeper exposures and/or perform angular, spectral and polarimetric differential imaging. Science in the visible is provided by two interferometric modules: VAMPIRES and FIRST, which enable sub-diffraction limited imaging in the visible region with polarimetric and spectroscopic capabilities respectively. We describe the instrument in detail and present preliminary results both on-sky and in the laboratory., Comment: Accepted for publication, 20 pages, 10 figures
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- 2015
14. On-sky speckle nulling with the Subaru Coronagraphic Extreme AO (SCExAO) instrument
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Tomoyuki Kudo, Christophe Clergeon, Olivier Guyon, Frantz Martinache, Nemanja Jovanovic, and Garima Singh
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Diffraction ,Wavefront ,Physics ,business.industry ,Astrophysics::Instrumentation and Methods for Astrophysics ,Deformable mirror ,law.invention ,Speckle pattern ,Optics ,Optical path ,law ,Computer vision ,Artificial intelligence ,business ,Adaptive optics ,Coronagraph ,Coherence (physics) - Abstract
Contrast limit for the direct imaging of extrasolar planets from ground based adaptive optics (AO) observations is set by the presence of static and slow-varying aberrations in the optical path that lead to the science instrument. To complement the otherwise highly successful angular differential imaging (ADI) technique toward small angular separation, we propose to employ additional wavefront control to modulate the diffraction. This flexible approach introduces enough diversity to discriminate genuine structures of the observed target from spurious diffraction features in the image. One possible implementation of such form of coherence differential imaging (CDI) is a speckle nulling algorithm that iteratively suppresses diffraction features inside a region constrained by the number of active elements of the deformable mirror modulating the wavefront, and the coronagraph. This paper presents on-sky results obtained with this approach, on the Subaru Coronagraphic Extreme AO (SCExAO) instrument.
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- 2014
15. Development and recent results from the Subaru coronagraphic extreme adaptive optics system
- Author
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Franck Marchis, Takayuki Kotani, Tomoyuki Kudo, Jonas Kuhn, Peter G. Tuthill, Guy Perrin, Gaspard Duchene, Elsa Huby, Olivier Lai, Naoshi Murakami, Christophe Clergeon, Garima Singh, F. Martinache, John H. White, Yutaka Hayano, O. Fumika, Sylvestre Lacour, Paul Stewart, Olivier Guyon, Barnaby Norris, Nemanja Jovanovic, Eugene Serabyn, Y. Minowa, Sébastien Vievard, K. Newman, Julien Woillez, Subaru Telescope, Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA), Central Arizona College, Coolidge, Jet Propulsion Laboratory, California Institute of Technology (JPL), The Univ. of Sydney (Australia), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Haute résolution angulaire en astrophysique, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Hokkaido University, Gemini Observatory, SETI Institute (United States), Univ. of California, Berkeley (United States), and European Southern Observatory (Germany)
- Subjects
Physics ,Wavefront ,Speckle pattern ,Interferometry ,Optics ,Apodization ,business.industry ,Aperture masking interferometry ,Wavefront sensor ,business ,Adaptive optics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Deformable mirror - Abstract
International audience; The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is one of a handful of extreme adaptive optics systems set to come online in 2014. The extreme adaptive optics correction is realized by a combination of precise wavefront sensing via a non-modulated pyramid wavefront sensor and a 2000 element deformable mirror. This system has recently begun on-sky commissioning and was operated in closed loop for several minutes at a time with a loop speed of 800 Hz, on ~150 modes. Further suppression of quasi-static speckles is possible via a process called "speckle nulling" which can create a dark hole in a portion of the frame allowing for an enhancement in contrast, and has been successfully tested on-sky. In addition to the wavefront correction there are a suite of coronagraphs on board to null out the host star which include the phase induced amplitude apodization (PIAA), the vector vortex, 8 octant phase mask, 4 quadrant phase mask and shaped pupil versions which operate in the NIR (y-K bands). The PIAA and vector vortex will allow for high contrast imaging down to an angular separation of 1 lambda/D to be reached; a factor of 3 closer in than other extreme AO systems. Making use of the left over visible light not used by the wavefront sensor is VAMPIRES and FIRST. These modules are based on aperture masking interferometry and allow for sub-diffraction limited imaging with moderate contrasts of ~100-1000:1. Both modules have undergone initial testing on-sky and are set to be fully commissioned by the end of 2014.
- Published
- 2014
16. Lyot-based Low Order Wavefront Sensor for Phase-mask Coronagraphs: Principle, Simulations and Laboratory Experiments
- Author
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Taro Matsuo, Christophe Clergeon, Frantz Martinache, Pierre Baudoz, Garima Singh, Olivier Guyon, Nemanja Jovanovic, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche en Communications et en Cybernétique de Nantes (IRCCyN), Mines Nantes (Mines Nantes)-École Centrale de Nantes (ECN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-PRES Université Nantes Angers Le Mans (UNAM)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, Université Paris sciences et lettres (PSL), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Physics ,[PHYS]Physics [physics] ,Accuracy and precision ,Lyot stop ,Dynamic range ,business.industry ,Astrophysics::Instrumentation and Methods for Astrophysics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Wavefront sensor ,law.invention ,Starlight ,Cardinal point ,Optics ,Space and Planetary Science ,law ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics ,Adaptive optics ,business ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Coronagraph ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,ComputingMilieux_MISCELLANEOUS - Abstract
High performance coronagraphic imaging of faint structures around bright stars at small angular separations requires fine control of tip, tilt and other low order aberrations. When such errors occur upstream of a coronagraph, they results in starlight leakage which reduces the dynamic range of the instrument. This issue has been previously addressed for occulting coronagraphs by sensing the starlight before or at the coronagraphic focal plane. One such solution, the coronagraphic low order wave-front sensor (CLOWFS) uses a partially reflective focal plane mask to measure pointing errors for Lyot-type coronagraphs. To deal with pointing errors in low inner working angle phase mask coronagraphs which do not have a reflective focal plane mask, we have adapted the CLOWFS technique. This new concept relies on starlight diffracted by the focal plane phase mask being reflected by the Lyot stop towards a sensor which reliably measures low order aberrations such as tip and tilt. This reflective Lyot-based wavefront sensor is a linear reconstructor which provides high sensitivity tip-tilt error measurements with phase mask coronagraphs. Simulations show that the measurement accuracy of pointing errors with realistic post adaptive optics residuals are approx. 10^-2 lambda/D per mode at lambda = 1.6 micron for a four quadrant phase mask. In addition, we demonstrate the open loop measurement pointing accuracy of 10^-2 lambda/D at 638 nm for a four quadrant phase mask in the laboratory., Comment: 9 Pages, 11 Figures, to be published in PASP June 2014 issue
- Published
- 2014
17. On-Sky Speckle Nulling Demonstration at Small Angular Separation with SCExAO
- Author
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Christophe Clergeon, Frantz Martinache, Olivier Guyon, Nemanja Jovanovic, Motohide Tamura, Tomoyuki Kudo, Christian Thalmann, Garima Singh, Michael W. McElwain, Thayne Currie, Low Energy Astrophysics (API, FNWI), Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France, Département Sciences de la Fabrication et Logistique (SFL-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-CMP-GC, California Institute of Technology (CALTECH), Observatoire de Paris, Université Paris sciences et lettres (PSL), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Subaru Telescope, National Astronomical Observatory of Japan (NAOJ), Institute of Astronomy [ETH Zürich], Department of Physics [ETH Zürich] (D-PHYS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), NASA, Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Dynamic speckle ,Physics ,[PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] ,business.industry ,Angular distance ,media_common.quotation_subject ,FOS: Physical sciences ,Astronomy and Astrophysics ,Context (language use) ,01 natural sciences ,010309 optics ,Speckle pattern ,Optics ,Space and Planetary Science ,Sky ,0103 physical sciences ,Halo ,Subaru Telescope ,Adaptive optics ,business ,Astrophysics - Instrumentation and Methods for Astrophysics ,010303 astronomy & astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,ComputingMilieux_MISCELLANEOUS ,media_common - Abstract
This paper presents the first on-sky demonstration of speckle nulling, which was achieved at the Subaru Telescope in the context of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) Project. Despite the absence of a high-order high-bandwidth closed-loop AO system, observations conducted with SCExAO show that even in poor-to-moderate observing conditions, speckle nulling can be used to suppress static and slow speckles even in the presence of a brighter dynamic speckle halo, suggesting that more advanced high-contrast imaging algorithms developed in the laboratory can be applied to ground-based systems., Comment: 5 figures, accepted for publication by PASP
- Published
- 2014
18. Open-loop control of SCExAO’s MEMS deformable mirror using the Fast Iterative Algorithm: speckle control performances
- Author
-
Olivier Guyon, Frantz Martinache, Colin Bradley, Celia Blain, and Christophe Clergeon
- Subjects
Physics ,Wavefront ,business.industry ,Iterative method ,Instrumentation ,Deformable mirror ,Speckle pattern ,Optics ,Cardinal point ,Computer vision ,Artificial intelligence ,business ,Actuator ,Adaptive optics - Abstract
Micro-Electro-Mechanical Systems (MEMS) deformable mirrors (DMs) are widely utilized in astronomical Adaptive Optics (AO) instrumentation. High precision open-loop control of MEMS DMs has been achieved by developing a high accuracy DM model, the Fast Iterative Algorithm (FIA), a physics-based model allowing precise control of the DM shape. Accurate open-loop control is particularly critical for the wavefront control of High- Contrast Imaging (HCI) instruments to create a dark hole area free of most slow and quasi-static speckles which remain the limiting factor for direct detection and imaging of exoplanets. The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system is one of these high contrast imaging instruments and uses a 1024-actuator MEMS deformable mirror (DM) both in closed-loop and open-loop. The DM is used to modulate speckles in order to distinguish (i) speckles due to static and slow-varying residual aberrations from (ii) speckles due to genuine structures, such as exoplanets. The FIA has been fully integrated into the SCExAO wavefront control software and we report the FIA’s performance for the control of speckles in the focal plane.
- Published
- 2012
19. How ELTs will acquire the first spectra of rocky habitable planets
- Author
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Olivier Guyon, Daniel W. Wilson, Mala Mateen, Ruslan Belikov, Eric Cady, Kunjithapatham Balasubramanian, Christophe Clergeon, and Frantz Martinache
- Subjects
Physics ,Stars ,Planetary habitability ,law ,Planet ,Astronomy ,Coronagraph ,Exoplanet ,Habitability of orange dwarf systems ,Main sequence ,law.invention ,Discoveries of exoplanets ,Astrobiology - Abstract
ELTs will offer angular resolution around 10mas in the near-IR and unprecedented sensitivity. While direct imaging of Earth-like exoplanets around Sun-like stars will stay out of reach of ELTs, we show that habitable planets around nearby M-type main sequence stars can be directly imaged. For about 300 nearby M dwarfs, the angular separation at maximum elongation is at or beyond 1 e/D in the near-IR for an ELT. The planet to star contrast is 1e-7 to 1e-8, similar to what the upcoming generation of Extreme-AO systems will achieve on 8-m telescopes, and the potential planets are sufficiently bright for near-IR spectroscopy. We show that the technological solutions required to achieve this goal exist. For example, the PIAACMC coronagraph can deliver full starlight rejection, 100% throughput and sub-e/D IWA for the EELT, GMT and TMT pupils. A closely related coronagraph is part of SCExAO on Subaru. We conclude that large ground-based telescopes will acquire the first high quality spectra of habitable planets orbiting M-type stars, while future space mission(s) will later target F-G-K type stars.
- Published
- 2012
20. The Subaru coronagraphic extreme AO project: first observations
- Author
-
Vincent Garrel, Frantz Martinache, Olivier Guyon, Christophe Clergeon, and Celia Blain
- Subjects
Wavefront ,Physics ,media_common.quotation_subject ,Astronomy ,Exoplanet ,law.invention ,law ,Planet ,Sky ,Angular resolution ,Transit (astronomy) ,Subaru Telescope ,Coronagraph ,media_common - Abstract
In 2009 our group started the integration of the SCExAO project, a highly exi ble, open platform for highcontrast imaging at the highest angular resolution, inserted between the coronagr aphic imaging camera HiCIAOand the 188-actuator AO system of Subaru. In its rst version, SCExAO combines a ME MS-based wavefrontcontrol system feeding a high performance PIAA-based coronagraph. This paper present s some of the imagesobtained during the rst engineering observations conducted with SCExAO in 2011: di ract ion limited imagingin the visible as well as PIAA coronagraphy in the near infrared; along with t he wavefront control strategies tobe tested on sky during the next round of SCExAO observations, scheduled in the Fall 2 012. 1. INTRODUCTION The last ten years of extrasolar planet research have been dominated by indirect detect ions techniques of radialvelocity (RV) and photometric transit. The observational bias of these techniq ues initially led to the discoveryof a large population of short period planets, exhibiting surprisingly divers e dynamics. Only as the time baselineincreases, do RV and transits become more and more sensitive to long period pla nets of wide orbital separation.
- Published
- 2012
21. Speckle Control with a remapped-pupil PIAA-coronagraph
- Author
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Frantz Martinache, Celia Blain, Christophe Clergeon, Olivier Guyon, Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France, Département Sciences de la Fabrication et Logistique (SFL-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-CMP-GC, Observatoire de Paris, Université Paris sciences et lettres (PSL), and Gemini Observatory, Northern Operations Center
- Subjects
Wavefront ,[PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] ,Computer science ,Angular distance ,business.industry ,FOS: Physical sciences ,Astronomy and Astrophysics ,01 natural sciences ,law.invention ,010309 optics ,Speckle pattern ,Optics ,Apodization ,Space and Planetary Science ,law ,Control system ,0103 physical sciences ,Calibration ,Subaru Telescope ,business ,Astrophysics - Instrumentation and Methods for Astrophysics ,010303 astronomy & astrophysics ,Coronagraph ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,ComputingMilieux_MISCELLANEOUS - Abstract
The PIAA is a now well demonstrated high contrast technique that uses an intermediate remapping of the pupil for high contrast coronagraphy (apodization), before restoring it to recover classical imaging capabilities. This paper presents the first demonstration of complete speckle control loop with one such PIAA coronagraph. We show the presence of a complete set of remapping optics (the so-called PIAA and matching inverse PIAA) is transparent to the wavefront control algorithm. Simple focal plane based wavefront control algorithms can thus be employed, without the need to model remapping effects. Using the Subaru Coronagraphic Extreme AO (SCExAO) instrument built for the Subaru Telescope, we show that a complete PIAA-coronagraph is compatible with a simple implementation of a speckle nulling technique, and demonstrate the benefit of the PIAA for high contrast imaging at small angular separation., 6 figures, submitted to PASP
- Published
- 2012
22. Wavefront control with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system
- Author
-
Tyler D. Groff, Vincent Garrel, Frantz Martinache, Robert Russell, Christophe Clergeon, and Olivier Guyon
- Subjects
Physics ,Wavefront ,business.industry ,Angular distance ,Exoplanet ,Deformable mirror ,law.invention ,Optics ,law ,Calibration ,Sensitivity (control systems) ,business ,Adaptive optics ,Coronagraph - Abstract
The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system uses advanced coronagraphic technique for high contrast imaging of exoplanets and disks as close as 1 lambda/D from the host star. In addition to unusual optics, achieving high contrast at this small angular separation requires a wavefront sensing and control architecture which is optimized for exquisite control and calibration of low order aberrations. The SCExAO system was thus designed to include the wavefront sensors required for bias-free high sensitivity and high speed wavefront measurements. Information is combined from two infrared wavefront sensors and a fast visible wavefront sensors to drive a single MEMS type deformable mirror mounted on a tip-tilt mount. The wavefront sensing and control architecture is highly integrated with the coronagraph system.
- Published
- 2011
23. The Subaru coronagraphic extreme AO project: progress report
- Author
-
Tyler D. Groff, Paul Stewart, Vincent Garrel, Frantz Martinache, Christophe Clergeon, Olivier Guyon, Celia Blain, and Robert Russell
- Subjects
Physics ,Wavefront ,business.industry ,Aperture ,Wavefront sensor ,law.invention ,Telescope ,Optics ,law ,Angular resolution ,business ,Subaru Telescope ,Adaptive optics ,Coronagraph ,Remote sensing - Abstract
In 2009 our group started the integration of the SCExAO project, a highly flexible, open platform for high contrast imaging at the highest angular resolution, inserted between the coronagraphic imaging camera HiCIAO and the 188-actuator AO system of Subaru. In its first version, SCExAO combines a MEMS-based wavefront control system feeding a high performance PIAA-based coronagraph. It also includes a coronagraphic low-order wavefront sensor, a non-redundant aperture mask and a visible imaging mode, all of them designed to take full advantage of the angular resolution that an 8-meter telescope has to offer. SCExAO is currently undergoing commissioning, and this paper presents the first on-sky results acquired in August 2011, using together Subaru's AO system, SCExAO and HiCIAO.
- Published
- 2011
24. SCExAO: First Results and On-Sky Performance
- Author
-
Frantz Martinache, Garima Singh, Nemanja Jovanovic, Christian Thalmann, Michael W. McElwain, Christophe Clergeon, Tomoyuki Kudo, Olivier Guyon, Thayne Currie, and Low Energy Astrophysics (API, FNWI)
- Subjects
Physics ,Wavefront ,business.industry ,media_common.quotation_subject ,Strehl ratio ,Astronomy ,Astronomy and Astrophysics ,Wavefront sensor ,Deformable mirror ,Speckle pattern ,Optics ,Cardinal point ,Space and Planetary Science ,Sky ,business ,Adaptive optics ,media_common - Abstract
We present new on-sky results for the Subaru Coronagraphic Extreme Adaptive Optics imager (SCExAO) verifying and quantifying the contrast gain enabled by key components: the closed-loop coronagraphic low-order wavefront sensor (CLOWFS) and focal plane wavefront control (“speckle nulling”). SCExAO will soon be coupled with a high-order, Pyramid wavefront sensor which will yield > 90% Strehl ratio and enable 106–107 contrast at small angular separations allowing us to image gas giant planets at solar system scales. Upcoming instruments like VAMPIRES, FIRST, and CHARIS will expand SCExAO's science capabilities.
- Published
- 2013
25. ULTIMATE-subaru: Wide-field near-infrared surveyor with GLAO at subaru telescope
- Author
-
Yusei Koyama, Ian Price, Yutaka Hayano, Nobuo Arimoto, Masayuki Akiyama, Tadayuki Kodama, Yosuke Minowa, Shin Oya, Takashi Hattori, Ikuru Iwata, Kentaro Motohara, Michitoshi Yoshida, Ichi Tanaka, Nicholas Herrald, Celine d'Orgeville, Christophe Clergeon, and Francois Rigaut
- Subjects
Physics ,Near-infrared spectroscopy ,Astronomy ,Instrumentation (computer programming) ,Adaptive optics ,Subaru Telescope ,Wide field
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