Dr. Timothy D. Brandt Profile

Dr. Timothy D. Brandt

Assistant Professor at Univ of California Santa Barbara

SPIE Involvement:

Author

Publications (34)

Proceedings Article | 30 September 2024 Presentation + Paper

Presentation + Paper

Design and simulation of non-redundant aperture masks for SCALES

Mackenzie Lach, Stephanie Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Timothy Brandt, Zackery Briesemeister, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Katherine de Kleer, Michael Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Imke de Pater, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 13095, 130950Y (2024) https://doi.org/10.1117/12.3019285

KEYWORDS: Design, Mirrors, Image restoration, Adaptive optics, Solar system, Optical path differences, Exoplanets, Telescopes, Spatial resolution, Source mask optimization

Read Abstract +

Proceedings Article | 17 September 2024 Poster + Paper

Poster + Paper

Characterizing exoplanet atmospheres with SCALES medium-spectral-resolution angular differential imaging

Aditi Desai, Steph Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Mackenzie Lach, Mike Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Patrick Sheehan, Andrew Skemer, R. Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 13096, 130969C (2024) https://doi.org/10.1117/12.3020521

KEYWORDS: Planets, Stars, Point spread functions, Exoplanets, Speckle, Atmospheres, Spectral resolution, Atmospheric modeling, Simulations, Signal to noise ratio

Read Abstract +

Proceedings Article | 12 September 2024 Poster + Paper

Poster + Paper

Design, scientific goals, and performance of the SCExAO survey for planets around accelerating stars

Mona El Morsy, Thayne Currie, Masayuki Kuzuhara, Jeffrey Chilcote, Olivier Guyon, Taylor Tobin, Timothy Brandt, Qier An, Kyohoon Anh, Danielle Bovie, Vincent Deo, Tyler Groff, Ziying Gu, Markus Janson, Nemanja Jovanovic, Yiting Li, Kellen Lawson, Julien Lozi, Miles Lucas, Christian Marois, Naoshi Murakami, Eric Nielsen, Barnaby Norris, Nour Skaf, Motohide Tamura, William Thomson, Taichi Uyama, Sebastien Vievard

Proceedings Volume 13097, 130977I (2024) https://doi.org/10.1117/12.3019513

KEYWORDS: Planets, Stars, Astrometry, Exoplanets, Adaptive optics, Coronagraphy, Atmospheres, Telescopes, Stellar astronomy, Physics

Read Abstract +

Proceedings Article | 18 July 2024 Presentation + Paper

Presentation + Paper

SCALES status report

R. Deno Stelter, Andrew Skemer, Stephanie Sallum, Nick MacDonald, Renate Kupke, Christopher Ratliff, Cyril Bourgenot, Gerald Cabak, Michael Gonzales, Cristian Rodriguez, Aaron Hunter, Ravinder Banyal, Thirupathi Sivarani, Michael Fitzgerald, Marc Kassis, Olivier Absil, Carlos Alvarez, Natatsha Batalha, Marc-André Boucher, Timothy Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, William Deich, Devika Dicakar, Étienne Gauvin, Thomas Greene, Armirul Hasan, Philip Hinz, Rebecca Jensen-Clem, Christopher Johnson, Govinda K. V., Isabel Kain, Mackenzie Lach, Jean-Thomas Landry, Michael Liu, Jim Lyke, Kenneth Magone, Eduardo Marin, Raquel Martinez, Dimitri Mawet, Rosalie McGurk, Brittany Miles, Ajin Parkash, Dale Sandford, Ramya Sethuram, Patrick Sheehan, Ji Man Sohn, Jordan Stone, Arun Surya, Hari Varshney, Eric Wang

Proceedings Volume 13096, 1309619 (2024) https://doi.org/10.1117/12.3020806

KEYWORDS: Mirrors, Cryostats, Coronagraphy, Spectrographs, Telescopes, Imaging systems, Exoplanets

Read Abstract +

Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

The slicer combined with array of lenslets for exoplanet spectroscopy (SCALES): driving science cases and expected outcomes

Steph Sallum, Andrew Skemer, Deno Stelter, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Rebecca Jensen-Clem, Isabel Kain, Charlie Kilpatrick, Renate Kupke, Mackenzie Lach, Michael Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Ramya Sethuram, Patrick Sheehan, Justin Spilker, Jordan Stone, Arun Surya, Sivarani Thirupathi, Athira Unni, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 1268003 (2023) https://doi.org/10.1117/12.2677831

KEYWORDS: Planets, Simulations, Exoplanets, Equipment, Spectroscopes, Spectrographs, Solar system, Lens arrays, Keck Observatory, Galactic astronomy

Read Abstract +

Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Designing custom medium resolution observing modes to trace planet accretion with SCALES

Raquel Martinez, Steph Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Renate Kupke, Mackenzie Lach, Mike Liu, Bruce Macintosh, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 126801W (2023) https://doi.org/10.1117/12.2677530

KEYWORDS: Planets, Spectroscopy, Exoplanets, Data modeling, Tunable filters, Thermography, Systems modeling, Spectrographs, Planetary systems, Optical filters

Read Abstract +

Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Simulating medium-spectral-resolution exoplanet characterization with SCALES angular/reference differential imaging

Aditi Desai, Stephanie Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Mackenzie Lach, Mike Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, R. Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 1268023 (2023) https://doi.org/10.1117/12.2677846

KEYWORDS: Exoplanets, Planets, Stars, Spectroscopy, Spectrographs, Spectral resolution, Speckle, Simulations, Lens arrays, Iterated function systems

Read Abstract +

Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Recovering simulated planet and disk signals using SCALES aperture masking

Mackenzie Lach, Steph Sallum, Ravinder Banyal, Natalie Batalha, Geoff Blake, Tim Brandt, Zackery Briesemeister, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Katherine de Kleer, Michael Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Imke de Pater, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 1268024 (2023) https://doi.org/10.1117/12.2677954

KEYWORDS: Design and modelling, Planets, Imaging systems, Exoplanets

Read Abstract +

Proceedings Article | 29 August 2022 Paper

Paper

Status of the Automated Data Extraction, Processing, and Tracking System (ADEPTS) for CHARIS/SCExAO

Taylor L. Tobin, Jonathan Pal, Jeffrey Chilcote, Timothy Brandt, Thayne Currie, Tyler Groff, Julien Lozi, Olivier Guyon

Proceedings Volume 12189, 121892C (2022) https://doi.org/10.1117/12.2630368

KEYWORDS: Databases, Data processing, Image processing, K band, Telescopes, Planets, Image filtering, Computer security, Point spread functions, Data archive systems

Read Abstract +

Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Design of SCALES: a 2-5 micron coronagraphic integral field spectrograph for Keck Observatory

Andrew Skemer, R. Deno Stelter, Stephanie Sallum, Nicholas MacDonald, Renate Kupke, Christopher Ratliff, Ravinder Banyal, Amirul Hasan, Hari Mohan Varshney, Arun Surya, Ajin Prakaesh, Sivarani Thirupathi, Ramya Sethuram, Govinda K.V., Michael Fitzgerald, Eric Wang, Marc Kassis, Olivier Absil, Carlos Alvarez, Natasha Batalha, Marc-André Boucher, Cyril Bourgenot, Timothy Brandt, Zackery Briesemeister, Katherine de Kleer, Imke de Pater, William Deich, Devika Divakar, Guillaume Filion, Étienne Gauvin, Michael Gonzales, Thomas Greene, Philip Hinz, Rebecca Jensen-Clem, Christopher Johnson, Isabel Kain, Gabriel Kruglikov, Mackenzie Lach, Jean-Thomas Landry, Jialin Li, Michael Liu, James Lyke, Kenneth Magnone, Eduardo Marin, Emily Martin, Raquel Martinez, Dimitri Mawet, Brittany Miles, Dale Sandford, Patrick Sheehan, Ji Man Sohn, Jordan Stone

Proceedings Volume 12184, 121840I (2022) https://doi.org/10.1117/12.2630577

KEYWORDS: Exoplanets, Spectrographs, Planets, Sensors, Coronagraphy, Imaging systems, Adaptive optics, Mirrors, Spectroscopy

Read Abstract +

Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

A new type of exoplanet direct imaging search: a SCExAO/CHARIS survey of accelerating stars

Thayne Currie, Timothy Brandt, Masayuki Kuzuhara, Jeffrey Chilcote, Edward Cashman, R. Liu, Kellen Lawson, Taylor Tobin, G. Mirek Brandt, Olivier Guyon, Julien Lozi, Vincent Deo, Sebastien Vievard, Kyoohun Ahn, Nour Skaf

Proceedings Volume 11823, 1182304 (2021) https://doi.org/10.1117/12.2595001

KEYWORDS: Stars, Planets, Exoplanets, Adaptive optics, Wavefronts, Wavefront sensors, Telescopes, Infrared imaging, Data processing, Photometry

Read Abstract +

Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

High-contrast integral field spectropolarimetry of planet-forming disks with SCExAO/CHARIS

Kellen Lawson, Thayne Currie, John Wisniewski, Jun Hashimoto, Olivier Guyon, N, Jeremy Kasdin, Tyler Groff, Julien Lozi, Timothy Brandt, Jeffrey Chilcote, Vincent Deo, Taichi Uyama, Sebastien Vievard

Proceedings Volume 11823, 118230D (2021) https://doi.org/10.1117/12.2594819

KEYWORDS: Polarization, Data modeling, Point spread functions, Coronagraphy, Adaptive optics, Polarimetry, Imaging systems, Calibration, Near infrared

Read Abstract +

Proceedings Article | 1 August 2021 Presentation

Presentation

On-sky demonstration of stochastic speckle discrimination for companion detection with the MKID Exoplanet Camera (MEC)

Sarah Steiger, Thayne Currie, Timothy Brandt, Olivier Guyon, Masayuki Kuzuhara, Jeffrey Chilcote, Tyler Groff, Julien Lozi, Alexander Walter, Neelay Fruitwala, John Bailey, Nicholas Zobrist, Noah Swimmer, Isabel Lipartito, Jennifer Smith, Clint Bockstiegel, Seth Meeker, Gregoire Coiffard, Rupert Dodkins, Paul Szypryt, Kristina Davis, Miguel Daal, Bruce Bumble, Sebastien Vievard, Ananya Sahoo, Vincent Deo, Nemanja Jovanovic, Frantz Martinache, Motohide Tamura, Benjamin Mazin

Proceedings Volume 11823, 1182307 (2021) https://doi.org/10.1117/12.2594872

KEYWORDS: Speckle, Stochastic processes, Exoplanets, Cameras, Sensors, Point spread functions, Stars, Signal to noise ratio, Photodetectors, Image resolution

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

The automated data extraction, processing, and tracking system for CHARIS

Taylor Tobin, Jeffrey Chilcote, Timothy Brandt, Thayne Currie, Tyler Groff, Julien Lozi, Olivier Guyon

Proceedings Volume 11452, 114521D (2020) https://doi.org/10.1117/12.2576255

KEYWORDS: Imaging spectroscopy, Data acquisition, Calibration, Spectroscopy, Spectral calibration, Point spread functions, Iterated function systems, Image registration, Image processing, Exoplanets

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

End-to-end simulation of the SCALES integral field spectrograph

Zackery Briesemeister, Steph Sallum, Andrew Skemer, R. Deno Stelter, Philip Hinz, Timothy Brandt

Proceedings Volume 11447, 114474Z (2020) https://doi.org/10.1117/12.2562143

KEYWORDS: Infrared spectroscopy, Spatial resolution, Thermography, Infrared radiation, Field spectroscopy, Infrared imaging, Exoplanets, Focus stacking software, Spectrographs, Imaging spectroscopy

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Update on the preliminary design of SCALES: the Santa Cruz Array of Lenslets for Exoplanet Spectroscopy

R. Deno Stelter, Andrew Skemer, Steph Sallum, Renate Kupke, Phil Hinz, Dimitri Mawet, Rebecca Jensen-Clem, Christopher Ratliffe, Nicholas MacDonald, William Deich, Gabriel Kruglikov, Marc Kassis, Jim Lyke, Zackary Briesemeister, Brittany Miles, Benjamin Gerard, Michael Fitzgerald, Timothy Brandt, Christian Marois

Proceedings Volume 11447, 1144764 (2020) https://doi.org/10.1117/12.2562768

KEYWORDS: Exoplanets, Imaging systems, Imaging spectroscopy, Spectroscopy, Planetary systems, Iterated function systems, Spectrographs, Spectral resolution, Coronagraphy, Keck Observatory

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Poster + Presentation + Paper

On-sky performance and recent results from the Subaru coronagraphic extreme adaptive optics system

Thayne Currie, Olivier Guyon, Julien Lozi, Ananya Sahoo, Sebastien Vievard, Vincent Deo, Jeffrey Chilcote, Tyler Groff, Timothy Brandt, Kellen Lawson, Nour Skaf, Frantz Martinache, N. Jeremy Kasdin

Proceedings Volume 11448, 114487H (2020) https://doi.org/10.1117/12.2576349

KEYWORDS: Adaptive optics, Coronagraphy, Stars, Planets, Exoplanets, Telescopes, Speckle, Polarimetry, Optical spheres, Gemini Planet Imager

Read Abstract +

Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

Performance and early science with the Subaru Coronagraphic Extreme Adaptive Optics project

Thayne Currie, Olivier Guyon, Julien Lozi, Tyler Groff, N. Jeremy Kasdin, Frantz Martinache, Timothy Brandt, Jeffrey Chilcote, Christian Marois, Benjamin Gerard, Nemanja Jovanovic, Sébastien Vievard

Proceedings Volume 11117, 111170X (2019) https://doi.org/10.1117/12.2529689

KEYWORDS: Adaptive optics, Coronagraphy, Telescopes, Spectrographs, Optical calibration, Stars, Gemini Planet Imager, Optical spheres, Signal to noise ratio, Atmospheric sensing

Read Abstract +

Proceedings Article | 16 July 2018 Paper

Paper

The planetary systems imager: 2-5 micron channel

Andrew Skemer, Deno Stelter, Dimitri Mawet, Michael Fitzgerald, Benjamin Mazin, Olivier Guyon, Christian Marois, Zackery Briesemeister, Timothy Brandt, Jeffrey Chilcote, Jacques-Robert Delorme, Nemanja Jovanovic, Jessica Lu, Maxwell Millar-Blanchaer, James Wallace, Gautam Vasisht, Lewis Roberts, Ji Wang

Proceedings Volume 10702, 10702A5 (2018) https://doi.org/10.1117/12.2314173

KEYWORDS: Exoplanets, Planets, Imaging systems, Adaptive optics, Imaging spectroscopy, Planetary systems, Spectrographs, Coronagraphy, Infrared imaging

Read Abstract +

SPIE Journal Paper | 24 November 2017 Open Access

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

Read Abstract +

Proceedings Article | 1 September 2017 Presentation + Paper

Presentation + Paper

First light of the CHARIS high-contrast integral-field spectrograph

Tyler Groff, Jeffrey Chilcote, Timothy Brandt, N. Jeremy Kasdin, Michael Galvin, Craig Loomis, Maxime Rizzo, Gillian Knapp, Olivier Guyon, Nemanja Jovanovic, Julien Lozi, Thayne Currie, Naruhisa Takato, Masahiko Hayashi

Proceedings Volume 10400, 1040016 (2017) https://doi.org/10.1117/12.2273525

KEYWORDS: Imaging systems, Spectrographs, Iterated function systems, Adaptive optics, K band, Spectral resolution, Exoplanets, High angular resolution imaging, Telescopes, Observatories

Read Abstract +

Proceedings Article | 1 September 2017 Presentation + Paper

Presentation + Paper

Simulating the WFIRST coronagraph integral field spectrograph

Maxime Rizzo, Tyler Groff, Neil Zimmermann, Qian Gong, Avi Mandell, Prabal Saxena, Michael McElwain, Aki Roberge, John Krist, A. J. Eldorado Riggs, Eric Cady, Camilo Mejia Prada, Timothy Brandt, Ewan Douglas, Kerri Cahoy

Proceedings Volume 10400, 104000B (2017) https://doi.org/10.1117/12.2273066

KEYWORDS: Iterated function systems, Spectrographs, Device simulation, Exoplanets, Atmospheric sciences, Planets, Stars, Cameras, Speckle, Wavefronts

Read Abstract +

Proceedings Article | 9 August 2016 Paper

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

Read Abstract +

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 | 29 July 2016 Paper

Paper

PISCES: an integral field spectrograph technology demonstration for the WFIRST coronagraph

Michael McElwain, Avi Mandell, Qian Gong, Jorge Llop-Sayson, Timothy Brandt, Victor Chambers, Bryan Grammer, Bradford Greeley, George Hilton, Marshall Perrin, Karl Stapelfeldt, Richard Demers, Hong Tang, Eric Cady

Proceedings Volume 9904, 99041A (2016) https://doi.org/10.1117/12.2231671

KEYWORDS: Spectrographs, Iterated function systems, Imaging spectroscopy, Sensors, Coronagraphy, Point spread functions, Relays, Mirrors, Prisms, Collimators

Read Abstract +

Proceedings Article | 16 September 2015 Paper

Paper

PISCES: high contrast integral field spectrograph simulations and data reduction pipeline

Jorge Llop Sayson, Nargess Memarsadeghi, Michael McElwain, Qian Gong, Marshall Perrin, Timothy Brandt, Bryan Grammer, Bradford Greeley, George Hilton, Catherine Marx

Proceedings Volume 9605, 960524 (2015) https://doi.org/10.1117/12.2188492

KEYWORDS: Sensors, Point spread functions, Device simulation, Wavefronts, Electroluminescent displays, Spectrographs, Iterated function systems, Gemini Planet Imager, Radio propagation, Optical simulations

Read Abstract +

Proceedings Article | 16 September 2015 Paper

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

Read Abstract +

Proceedings Article | 21 July 2014 Paper

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

Read Abstract +

Proceedings Article | 18 July 2014 Paper

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

Read Abstract +

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

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

Read Abstract +

Proceedings Article | 26 September 2013 Paper

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

Read Abstract +

Proceedings Article | 26 September 2013 Paper

Paper

PISCES: an integral field spectrograph to advance high contrast imaging technologies

Michael McElwain, Marshall Perrin, Qian Gong, Ashlee Wilkins, Karl Stapelfeldt, Bruce Woodgate, Timothy Brandt, Sara Heap, George Hilton, Jeffrey Kruk, Dwight Moody, John Trauger

Proceedings Volume 8864, 88641O (2013) https://doi.org/10.1117/12.2024385

KEYWORDS: Iterated function systems, Coronagraphy, Exoplanets, Planets, Imaging spectroscopy, Wavefronts, Spectrographs, Sensors, Electroluminescent displays, Point spread functions

Read Abstract +

Proceedings Article | 26 September 2013 Paper

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

Read Abstract +

Proceedings Article | 24 September 2012 Paper

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

Read Abstract +

Proceedings Article | 24 September 2012 Paper

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

Read Abstract +

Showing 5 of 34 publications

SIGN IN TO:

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Advertisement

Advertisement