Dr. Mary Anne Limbach Profile

Dr. Mary Anne Limbach

Research Associate

SPIE Involvement:

Author

Publications (25)

SPIE Journal Paper | 9 December 2024 Open Access

Rapid characterization of exoplanet atmospheres with the Exoplanet Transmission Spectroscopy Imager

Luke Schmidt, Ryan Oelkers, Erika Cook, Mary Anne Limbach, Darren DePoy, Jennifer Marshall, Landon Holcomb, Willians Pena, Jacob Purcell, Enrique Gonzalez Vega

JATIS, Vol. 10, Issue 04, 045005, (December 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.4.045005

KEYWORDS: Exoplanets, Stars, Cameras, Telescopes, Tunable filters, Prisms, Atmospheres, Equipment, Sensors, Optical filters

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Proceedings Article | 18 July 2024 Poster + Paper

GPI 2.0: upgrade status of the Gemini Planet Imager

Jeffrey Chilcote, Quinn Konopacky, Randall Hamper, Bruce Macintosh, Christian Marois, Dmitry Savransky, Rémi Soummer, Jean-Pierre Véran, Guido Agapito, Arlene Aleman, Marco Bonaglia, Marc-André Boucher, Joel Burke, Vincent Chambouleyron, Robert De Rosa, Clarissa Do Ó, Jennifer Dunn, Matthew Engstrom, Simone Esposito, Guillaume Filion, Joeleff Fitzsimmons, Oyku Galvan, Dan Kerley, Jean-Thomas Landry, Olivier Lardière, Daniel Levinstein, Mary Anne Limbach, Jérôme Maire, Anna Matzner, Teo Mocnik, Bryony Nickson, Eric Nielsen, Jayke Nguyen, Meiji Nguyen, Saavidra Perera, Dillon Peng, Marshall Perrin, Emiel Por, Laurent Pueyo, Carlos Quiroz, Fredrik Rantakyrö, Brian Sands, Andreas Seifahrt, Garima Singh, Eduardo Wolf

Proceedings Volume 13096, 1309699 (2024) https://doi.org/10.1117/12.3020642

KEYWORDS: Gemini Planet Imager, Wavefront sensors, Planets, Gemini Observatory, Iterated function systems, Adaptive optics, Stars, Equipment, Prisms, Design

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Proceedings Article | 5 October 2023 Poster + Paper

Testing and performance of IFS upgrades for GPI 2.0

Dillon Peng, Jeffrey Chilcote, Quinn Konopacky, Randall Hamper, Joel Burke, Brian Sands, Matthew Engstrom, Abigail Karaszewski, Rebecca Boyle, Mary Anne Limbach, Alexandra Greenbaum, Anand Sivaramakrishnan, Alexa Rizika, Saavidra Perera, Clarissa Do Ó, Jayke Nguyen, Bruce Macintosh, Joeleff Fitzsimmons, Christian Marois, Fredrik Rantakyrö, Arlene Aleman, Jérôme Maire, Robert De Rosa, Emiel Por, Dmitry Savransky, Meiji Nguyen, Marshall Perrin, Remi Soummer, Laurent Pueyo, Bryony Nickson, Eckhart Spalding

Proceedings Volume 12680, 126801Y (2023) https://doi.org/10.1117/12.2677675

KEYWORDS: Prisms, Gemini Planet Imager, Iterated function systems, Optical filters, Spectral resolution, Optical alignment, Gemini Observatory, Design and modelling, Wavefront sensors

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Proceedings Article | 5 October 2023 Presentation + Paper

Upgrading the Gemini planet imager to GPI 2.0

Saavidra Perera, Jeffrey Chilcote, Quinn Konopacky, Joeleff Fitzsimmons, Randall Hamper, Bruce Macintosh, Christian Marois, Dmitry Savransky, Remi Soummer, Jean-Pierre Veran, Guido Agapito, Arlene Aleman, S. Mark Ammons, Marco Bonaglia, Marc-Andre Boucher, Joel Burke, Maeve Curliss, Robert De Rosa, Clarissa Do Ó, Jennifer Dunn, Simone Esposito, Guillaume Filion, Dan Kerley, Jean-Thomas Landry, Olivier Lardiere, Daniel Levinstein, Duan Li, Mary Anne Limbach, Alex Madurowicz, Jérôme Maire, Maxwell Millar-Blanchaer, Bryony Nickson, Eric Nielsen, Jayke Nguyen, Meiji Nguyen, Dillon Peng, Marshall Perrin, Emiel Por, Lisa Poyneer, Laurent Pueyo, Fredrik Rantakyrö, Brian Sands, Eckhart Spalding, Kaitlyn Summey

Proceedings Volume 12680, 1268001 (2023) https://doi.org/10.1117/12.2676960

KEYWORDS: Gemini Planet Imager, Wavefront sensors, Planets, Gemini Observatory, Equipment, Adaptive optics, Prisms, Cameras, Stars, Exoplanets

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Proceedings Article | 29 August 2022 Poster + Paper

GPI 2.0: performance of upgrades to the Gemini Planet Imager CAL and IFS

Dillon Peng, Maeve Curliss, Mary Anne Limbach, Jeffrey Chilcote, Randall Hamper, Quinn Konopacky, Joeleff Fitzsimmons, Bruce Macintosh, Christian Marois, Fredrik Rantakyrö, Arlene Aleman, Jérôme Maire, Robert De Rosa, Emiel Por, Dmitry Savransky, Brian Sands, Marshall Perrin, Remi Soummer, Isabel Kain, Laurent Pueyo, Bryony Nickson, Meiji Nguyen, Clarissa Do Ó, Saavidra Perera, Eckhart Spalding

Proceedings Volume 12184, 1218443 (2022) https://doi.org/10.1117/12.2630329

KEYWORDS: Gemini Planet Imager, Sensors, Cameras, Prisms, Microlens array, Wavefront sensors, Spectral resolution, Gemini Observatory

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Proceedings Article | 29 August 2022 Presentation + Paper

GPI 2.0: upgrade status of the Gemini Planet Imager

Jeffrey Chilcote, Quinn Konopacky, Joeleff Fitzsimmons, Randall Hamper, Bruce Macintosh, Christian Marois, Dmitry Savransky, Remi Soummer, Jean-Pierre Véran, Guido Agapito, Arlene Aleman, S. Mark Ammons, Marco Bonaglia, Marc-Andre Boucher, Maeve Curliss, Robert De Rosa, Clarissa Do Ó, Jennifer Dunn, Simone Esposito, Guillaume Filion, Dan Kerley, Jean-Thomas Landry, Olivier Lardiere, Daniel Levinstein, Duan Li, Mary Anne Limbach, Alex Madurowicz, Jérôme Maire, Max Millar-Blanchaer, Bryony Nickson, Eric Nielsen, Jayke Nguyen, Meiji Nguyen, Dillon Peng, Saavidra Perera, Marshall Perrin, Emiel Por, Lisa Poyneer, Laurent Pueyo, Fredrik Rantakyrö, Brian Sands, Eckhart Spalding, Kaitlyn Summey

Proceedings Volume 12184, 121841T (2022) https://doi.org/10.1117/12.2630159

KEYWORDS: Gemini Planet Imager, Planets, Stars, Gemini Observatory, Adaptive optics, Prisms, Exoplanets, Iterated function systems, Wavefront sensors, Spectral resolution

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Proceedings Article | 29 August 2022 Poster + Paper

The Exoplanet Transmission Spectroscopy Imager (ETSI), a new instrument for rapid characterization of exoplanet atmospheres

Luke Schmidt, Mary Anne Limbach, Erika Cook, D. L. DePoy, Ryan Oelkers, J. L. Marshall, Landon Holcomb, Willians Pena, Jacob Purcell, Enrique Gonzalez Vega

Proceedings Volume 12184, 1218486 (2022) https://doi.org/10.1117/12.2630196

KEYWORDS: Dielectric filters, Interference filters, Optical filter design, Exoplanets, Stars, Prisms, Cameras, Telescopes, Sensors, Optical filters, Atmospheric modeling, Collimators, Point spread functions

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Proceedings Article | 29 August 2022 Paper

GPI 2.0: characterizing self-luminous exoplanets through low-resolution infrared spectroscopy

Arlene Alemán, Bruce Macintosh, Mary Anne Limbach, Mark Marley, Jeffrey Chilcote, Quinn Konopacky, Dmitry Savransky

Proceedings Volume 12184, 121844B (2022) https://doi.org/10.1117/12.2630793

KEYWORDS: Gemini Planet Imager, Signal to noise ratio, Exoplanets, Planets, Stars, Spectral resolution, Spectrographs, Data modeling, Instrument modeling

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Proceedings Article | 13 December 2020 Poster + Paper

The Exoplanet Transmission Spectroscopy Imager (ETSI)

Mary Anne Limbach, Luke Schmidt, D. DePoy, Jeffrey Mason, Mike Scobey, Pat Brown, Chelsea Taylor, Jennifer Marshall

Proceedings Volume 11447, 114477D (2020) https://doi.org/10.1117/12.2562371

KEYWORDS: Exoplanets, Imaging spectroscopy, Spectroscopes, Imaging systems, Image filtering, Prisms, Telescopes, Atmospheric modeling, Atmospheric sensing, Bandpass filters

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Proceedings Article | 13 December 2020 Poster + Paper

GPI 2.0: Upgrades to the IFS including new spectral modes

Mary Anne Limbach, Jeffrey Chilcote, Quinn Konopacky, Robert De Rosa, Randall Hamper, Bruce Macintosh, Christian Marois, Marshall Perrin, Dmitry Savransky, Jean-Pierre Veran, Jason Wang, Arlene Aleman

Proceedings Volume 11447, 114475D (2020) https://doi.org/10.1117/12.2576331

KEYWORDS: Gemini Planet Imager, Prisms, Optical filters, K band, Exoplanets, Spectral calibration, Calibration

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Proceedings Article | 13 December 2020 Presentation + Paper

GPI 2.0: upgrading the Gemini Planet Imager

Jeffrey Chilcote, Quinn Konopacky, Robert De Rosa, Randall Hamper, Bruce Macintosh, Christian Marois, Marshall Perrin, Dmitry Savransky, Rémi Soummer, Jean-Pierre Véran, Guido Agapito, Arlene Aleman, S. Mark Ammons, Marco Bonaglia, Marc-Andre Boucher, Maeve Curliss, Jennifer Dunn, Simone Esposito, Guillaume Filion, Joeleff Fitzsimmons, Isabel Kain, Dan Kerley, Jean-Thomas Landry, Olivier Lardiere, Marie Lemoine-Busserolle, Duan Li, Mary Anne Limbach, Alex Madurowicz, Jerome Maire, Mamadou N'Diaye, Eric Nielsen, Lisa Poyneer, Laurent Pueyo, Kaitlyn Summey, Coleman Thomas

Proceedings Volume 11447, 114471S (2020) https://doi.org/10.1117/12.2562578

KEYWORDS: Gemini Planet Imager, Gemini Observatory, Jupiter, Exoplanets, Observatories, Planets, Telescopes, Wavefront sensors, Spectral resolution, Prisms

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Proceedings Article | 9 September 2019 Paper

Rapid-prototyping a tabletop integral field spectrograph

Michael Galvin, Christian Delacroix, Mary Anne Limbach, Tyler Groff, Maxime Rizzo, N. Jeremy Kasdin

Proceedings Volume 11115, 1111519 (2019) https://doi.org/10.1117/12.2527773

KEYWORDS: Prisms, Optomechanical design, Sensors, Spectrographs, Algorithm development, Commercial off the shelf technology, Optical alignment, Mirrors, Cameras, 3D printing, Rapid manufacturing, Optomechanical components, Infrared Imaging Spectrograph

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Proceedings Article | 27 July 2018 Paper

First light of the High Contrast Integral Field Spectrograph (HCIFS)

Christian Delacroix, He Sun, Michael Galvin, Mary Anne Limbach, Tyler Groff, Maxime Rizzo, Matthew Grossman, Katherine Mumm, N. Jeremy Kasdin

Proceedings Volume 10706, 107065L (2018) https://doi.org/10.1117/12.2312773

KEYWORDS: Spectrographs, Cameras, Wavefronts, Coronagraphy, Exoplanets, Optical design, Planets, Imaging spectroscopy, Spectral resolution

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SPIE Journal Paper | 24 November 2017 Open Access

Data reduction pipeline for the CHARIS integral-field spectrograph I: detector readout calibration and data cube extraction

Timothy D. Brandt, Maxime Rizzo, Tyler Groff, Jeffrey Chilcote, Johnny P. Greco, N. Jeremy Kasdin, Mary Anne Limbach, Michael Galvin, Craig Loomis, Gillian Knapp, Michael W. McElwain, Nemanja Jovanovic, Thayne Currie, Kyle Mede, Motohide Tamura, Naruhisa Takato, Masahiko Hayashi

JATIS, Vol. 3, Issue 04, 048002, (November 2017) https://doi.org/10.1117/12.10.1117/1.JATIS.3.4.048002

KEYWORDS: Sensors, Calibration, Spectrographs, Point spread functions, Signal to noise ratio, Photometry, Iterated function systems, Spectral resolution, Gemini Planet Imager, K band

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Proceedings Article | 9 August 2016 Paper

Laboratory testing and performance verification of the CHARIS integral field spectrograph

Tyler Groff, Jeffrey Chilcote, N. Jeremy Kasdin, Michael Galvin, Craig Loomis, Michael Carr, Timothy Brandt, Gillian Knapp, Mary Anne Limbach, Olivier Guyon, Nemanja Jovanovic, Michael McElwain, Naruhisa Takato, Masahiko Hayashi

Proceedings Volume 9908, 99080O (2016) https://doi.org/10.1117/12.2233447

KEYWORDS: Spectrographs, Prisms, Telescopes, K band, Cryogenics, Coronagraphy, Spectral resolution, Point spread functions, Sensors, Calibration

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The Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS) is an integral field spectrograph (IFS) that has been built for the Subaru telescope. CHARIS has two imaging modes; the high-resolution mode is R82, R69, and R82 in J, H, and K bands respectively while the low-resolution discovery mode uses a second low-resolution prism with R19 spanning 1.15-2.37 microns (J+H+K bands). The discovery mode is meant to augment the low inner working angle of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) adaptive optics system, which feeds CHARIS a coronagraphic image. The goal is to detect and characterize brown dwarfs and hot Jovian planets down to contrasts five orders of magnitude dimmer than their parent star at an inner working angle as low as 80 milliarcseconds. CHARIS constrains spectral crosstalk through several key aspects of the optical design. Additionally, the repeatability of alignment of certain optical components is critical to the calibrations required for the data pipeline. Specifically, the relative alignment of the lenslet array, prism, and detector must be highly stable and repeatable between imaging modes. We report on the measured repeatability and stability of these mechanisms, measurements of spectral crosstalk in the instrument, and the propagation of these errors through the data pipeline. Another key design feature of CHARIS is the prism, which pairs Barium Fluoride with Ohara L-BBH2 high index glass. The dispersion of the prism is significantly more uniform than other glass choices, and the CHARIS prisms represent the first NIR astronomical instrument that uses L-BBH2 as the high index material. This material choice was key to the utility of the discovery mode, so significant efforts were put into cryogenic characterization of the material. The final performance of the prism assemblies in their operating environment is described in detail. The spectrograph is going through final alignment, cryogenic cycling, and is being delivered to the Subaru telescope in April 2016. This paper is a report on the laboratory performance of the spectrograph, and its current status in the commissioning process so that observers will better understand the instrument capabilities. We will also discuss the lessons learned during the testing process and their impact on future high-contrast imaging spectrographs for wavefront control.

Proceedings Article | 16 September 2015 Paper

The CHARIS IFS for high contrast imaging at Subaru

Tyler Groff, N. Jeremy Kasdin, Mary Anne Limbach, Michael Galvin, Michael Carr, Gillian Knapp, Timothy Brandt, Craig Loomis, Norman Jarosik, Kyle Mede, Michael McElwain, Douglas Leviton, Kevin Miller, Manuel Quijada, Olivier Guyon, Nemanja Jovanovic, Naruhisa Takato, Masahiko Hayashi

Proceedings Volume 9605, 96051C (2015) https://doi.org/10.1117/12.2188465

KEYWORDS: Wavefronts, Iterated function systems, Prisms, Coronagraphy, Adaptive optics, Sensors, Spectrographs, K band, Telescopes, Collimators

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Proceedings Article | 21 July 2014 Paper

CHARIS science: performance simulations for the Subaru Telescope's third-generation of exoplanet imaging instrumentation

Timothy Brandt, Michael McElwain, Markus Janson, Gillian Knapp, Kyle Mede, Mary Limbach, Tyler Groff, Adam Burrows, James Gunn, Olivier Guyon, Jun Hashimoto, Masahiko Hayashi, Nemanja Jovanovic, N. Kasdin, Masayuki Kuzuhara, Robert Lupton, Frantz Martinache, Satoko Sorahana, David Spiegel, Naruhisa Takato, Motohide Tamura, Edwin Turner, Robert Vanderbei, John Wisniewski

Proceedings Volume 9148, 914849 (2014) https://doi.org/10.1117/12.2057256

KEYWORDS: Stars, Planets, Exoplanets, Telescopes, Adaptive optics, Gemini Planet Imager, Coronagraphy, Space telescopes, Iterated function systems, Combustion

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Proceedings Article | 18 July 2014 Paper

Construction and status of the CHARIS high contrast imaging spectrograph

Tyler Groff, N. Kasdin, Mary Limbach, Michael Galvin, Michael Carr, Gillian Knapp, Timothy Brandt, Craig Loomis, Norm Jarosik, Kyle Mede, Michael McElwain, Markus Janson, Olivier Guyon, Nemanja Jovanovic, Naruhisa Takato, Frantz Martinache, Masahiko Hayashi

Proceedings Volume 9147, 91471W (2014) https://doi.org/10.1117/12.2055769

KEYWORDS: Prisms, Spectrographs, Sensors, Coronagraphy, Telescopes, K band, Spectral resolution, Wavefronts, Exoplanets, Planets

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Princeton University is building the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS), an integral field spectrograph (IFS) for the Subaru telescope. CHARIS is funded by the National Astronomical Observatory of Japan and is designed to take high contrast spectra of brown dwarfs and hot Jovian planets in the coronagraphic image provided by the Coronagraphic Extreme Adaptive Optics (SCExAO) and the AO188 adaptive optics systems. The project is now in the build and test phase at Princeton University. Once laboratory testing has been completed CHARIS will be integrated with SCExAO and AO188 in the winter of 2016. CHARIS has a high-resolution characterization mode in J, H, and K bands. The average spectral resolution in J, H, and K bands are R82, R68, and R82 respectively, the uniformity of which is a direct result of a new high index material, L-BBH2. CHARIS also has a second low-resolution imaging mode that spans J,H, and K bands with an average spectral resolution of R19, a feature unique to this instrument. The field of view in both imaging modes is 2.07x2.07 arcseconds. SCExAO+CHARIS will detect objects five orders of magnitude dimmer than their parent star down to an 80 milliarcsecond inner working angle. The primary challenge with exoplanet imaging is the presence of quasi-static speckles in the coronagraphic image. SCExAO has a wavefront control system to suppress these speckles and CHARIS will address their impact on spectral crosstalk through hardware design, which drives its optical and mechanical design. CHARIS constrains crosstalk to be below 1% for an adjacent source that is a full order of magnitude brighter than the neighboring spectra. Since CHARIS is on the Nasmyth platform, the optical alignment between the lenslet array and prism is highly stable. This improves the stability of the spectra and their orientation on the detector and results in greater stability in the wavelength solution for the data pipeline. This means less uncertainty in the post-processing and less overhead for on-sky calibration procedures required by the data pipeline. Here we present the science case, design, and construction status of CHARIS. The design and lessons learned from testing CHARIS highlights the choices that must be considered to design an IFS for high signal-to-noise spectra in a coronagraphic image. The design considerations and lessons learned are directly applicable to future exoplanet instrumentation for extremely large telescopes and space observatories capable of detecting rocky planets in the habitable zone.

Proceedings Article | 14 July 2014 Paper

ERIS: the exoplanet high-resolution image simulator for CHARIS

Mary Anne Limbach, Tyler Groff, N. Kasdin, Timothy Brandt, Kyle Mede, Craig Loomis, Masahiko Hayashi, Naruhisa Takato

Proceedings Volume 9147, 91478E (2014) https://doi.org/10.1117/12.2056282

KEYWORDS: Exoplanets, Sensors, Fourier transforms, Stars, Atmospheric optics, Adaptive optics, Device simulation, Spectrographs, Iterated function systems, Optics manufacturing

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Proceedings Article | 26 September 2013 Paper

Design of the CHARIS integral field spectrograph for exoplanet imaging

Tyler Groff, Mary Anne Peters, N. Jeremy Kasdin, Gillian Knapp, Michael Galvin, Michael Carr, Michael McElwain, Timothy Brandt, Markus Janson, James Gunn, Robert Lupton, Olivier Guyon, Frantz Martinache, Nemanja Jovanovic, Masahiko Hayashi, Naruhisa Takato

Proceedings Volume 8864, 88640H (2013) https://doi.org/10.1117/12.2025081

KEYWORDS: Prisms, Planets, Spectrographs, Exoplanets, Coronagraphy, Sensors, Adaptive optics, Telescopes, Cameras, Space telescopes

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Proceedings Article | 26 September 2013 Paper

The optical design of CHARIS: an exoplanet IFS for the Subaru telescope

Mary Anne Peters-Limbach, Tyler Groff, N. Jeremy Kasdin, Dave Driscoll, Michael Galvin, Allen Foster, Michael Carr, Dave LeClerc, Rad Fagan, Michael McElwain, Gillian Knapp, Timothy Brandt, Markus Janson, Olivier Guyon, Nemanja Jovanovic, Frantz Martinache, Masahiko Hayashi, Naruhisa Takato

Proceedings Volume 8864, 88641N (2013) https://doi.org/10.1117/12.2024070

KEYWORDS: Spectrographs, Prisms, Iterated function systems, Sensors, Point spread functions, Telescopes, Exoplanets, Optical design, Spectral resolution, Mirrors

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Proceedings Article | 24 September 2012 Paper

Conceptual design of the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS) for the Subaru telescope

Mary Peters, Tyler Groff, N. Jeremy Kasdin, Michael McElwain, Michael Galvin, Michael Carr, Robert Lupton, James Gunn, Gillian Knapp, Qian Gong, Alexis Carlotti, Timothy Brandt, Markus Janson, Olivier Guyon, Frantz Martinache, Masahiko Hayashi, Naruhisa Takato

Proceedings Volume 8446, 84467U (2012) https://doi.org/10.1117/12.926381

KEYWORDS: Point spread functions, Sensors, Telescopes, Coronagraphy, Iterated function systems, Exoplanets, Adaptive optics, Spectrographs, Imaging spectroscopy, Optical instrument design

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Proceedings Article | 24 September 2012 Paper

Scientific design of a high contrast integral field spectrograph for the Subaru Telescope

Michael McElwain, Timothy Brandt, Markus Janson, Gillian Knapp, Mary Peters, Adam Burrows, Alexis Carlotti, Michael Carr, Tyler Groff, James Gunn, Olivier Guyon, Masahiko Hayashi, N. Jeremy Kasdin, Masayuki Kuzuhara, Robert Lupton, Frantz Martinache, David Spiegel, Naruhisa Takato, Motohide Tamura, Edwin Turner, Robert Vanderbei

Proceedings Volume 8446, 84469C (2012) https://doi.org/10.1117/12.927108

KEYWORDS: Exoplanets, Stars, Telescopes, Planets, Spectrographs, Coronagraphy, Adaptive optics, Iterated function systems, Spectral resolution, Imaging spectroscopy

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Proceedings Article | 15 July 2008 Paper

A high-Strehl low-resolution optical imager (BESSEL): a measurement of the inner scale of turbulence

Mary Anne Peters, Laird Close, Tom Stalcup, Matt Rademacher, Grover Swartzlander, Erin Ford, Rukiah Abdul-Malik

Proceedings Volume 7015, 70156G (2008) https://doi.org/10.1117/12.789592

KEYWORDS: Telescopes, Coronagraphy, Advanced distributed simulations, Turbulence, Stars, Binary data, Mirrors, Adaptive optics, Cameras, Wavefront distortions

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Proceedings Article | 19 September 2007 Paper

Advancements of the optical vortex coronagraph

The UGrover Swartzlander, Erin Ford, Rukiah Abdul-Malik, Joshua Kim, Laird Close, Mary Anne Peters, David Palacios, Daniel Wilson

Proceedings Volume 6693, 669311 (2007) https://doi.org/10.1117/12.734230

KEYWORDS: Coronagraphy, Optical vortices, Stars, Telescopes, Planets, Adaptive optics, Photomasks, Exoplanets, Electron beam lithography, Spiral phase plates

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