Construction and status of the CHARIS high contrast imaging spectrograph

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Citations (Scopus)

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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9147
ISBN (Print)9780819496157
DOIs
StatePublished - 2014
Externally publishedYes
EventGround-Based and Airborne Instrumentation for Astronomy V - Montreal, Canada
Duration: Jun 22 2014Jun 26 2014

Other

OtherGround-Based and Airborne Instrumentation for Astronomy V
CountryCanada
CityMontreal
Period6/22/146/26/14

Fingerprint

High Contrast Imaging
High Angular Resolution
Spectrographs
Spectrograph
angular resolution
spectrographs
Imaging
Imaging techniques
high resolution
extremely high frequencies
Exoplanets
lessons learned
Adaptive optics
extrasolar planets
Spectral resolution
Spectral Resolution
Crosstalk
crosstalk
Speckle
Observatories

Keywords

  • Broadband
  • Coronagraphy
  • Exoplanets
  • Extreme Adaptive Optics
  • Integral Field Spectrograph

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Groff, T. D., Kasdin, N. J., Limbach, M. A., Galvin, M., Carr, M. A., Knapp, G., ... Hayashi, M. (2014). Construction and status of the CHARIS high contrast imaging spectrograph. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 9147). [91471W] SPIE. https://doi.org/10.1117/12.2055769

Construction and status of the CHARIS high contrast imaging spectrograph. / Groff, Tyler D.; Kasdin, N. J.; Limbach, Mary A.; Galvin, Michael; Carr, Michael A.; Knapp, Gillian; Brandt, Timothy; Loomis, Craig; Jarosik, Norm; Mede, Kyle; McElwain, Michael W.; Janson, Markus; Guyon, Olivier; Jovanovic, Nemanja; Takato, Naruhisa; Martinache, Frantz; Hayashi, Masahiko.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9147 SPIE, 2014. 91471W.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Groff, TD, Kasdin, NJ, Limbach, MA, Galvin, M, Carr, MA, Knapp, G, Brandt, T, Loomis, C, Jarosik, N, Mede, K, McElwain, MW, Janson, M, Guyon, O, Jovanovic, N, Takato, N, Martinache, F & Hayashi, M 2014, Construction and status of the CHARIS high contrast imaging spectrograph. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 9147, 91471W, SPIE, Ground-Based and Airborne Instrumentation for Astronomy V, Montreal, Canada, 6/22/14. https://doi.org/10.1117/12.2055769
Groff TD, Kasdin NJ, Limbach MA, Galvin M, Carr MA, Knapp G et al. Construction and status of the CHARIS high contrast imaging spectrograph. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9147. SPIE. 2014. 91471W https://doi.org/10.1117/12.2055769
Groff, Tyler D. ; Kasdin, N. J. ; Limbach, Mary A. ; Galvin, Michael ; Carr, Michael A. ; Knapp, Gillian ; Brandt, Timothy ; Loomis, Craig ; Jarosik, Norm ; Mede, Kyle ; McElwain, Michael W. ; Janson, Markus ; Guyon, Olivier ; Jovanovic, Nemanja ; Takato, Naruhisa ; Martinache, Frantz ; Hayashi, Masahiko. / Construction and status of the CHARIS high contrast imaging spectrograph. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9147 SPIE, 2014.
@inproceedings{628bdec278e84702830e206d18b42101,
title = "Construction and status of the CHARIS high contrast imaging spectrograph",
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.",
keywords = "Broadband, Coronagraphy, Exoplanets, Extreme Adaptive Optics, Integral Field Spectrograph",
author = "Groff, {Tyler D.} and Kasdin, {N. J.} and Limbach, {Mary A.} and Michael Galvin and Carr, {Michael A.} and Gillian Knapp and Timothy Brandt and Craig Loomis and Norm Jarosik and Kyle Mede and McElwain, {Michael W.} and Markus Janson and Olivier Guyon and Nemanja Jovanovic and Naruhisa Takato and Frantz Martinache and Masahiko Hayashi",
year = "2014",
doi = "10.1117/12.2055769",
language = "English (US)",
isbn = "9780819496157",
volume = "9147",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",

}

TY - GEN

T1 - Construction and status of the CHARIS high contrast imaging spectrograph

AU - Groff, Tyler D.

AU - Kasdin, N. J.

AU - Limbach, Mary A.

AU - Galvin, Michael

AU - Carr, Michael A.

AU - Knapp, Gillian

AU - Brandt, Timothy

AU - Loomis, Craig

AU - Jarosik, Norm

AU - Mede, Kyle

AU - McElwain, Michael W.

AU - Janson, Markus

AU - Guyon, Olivier

AU - Jovanovic, Nemanja

AU - Takato, Naruhisa

AU - Martinache, Frantz

AU - Hayashi, Masahiko

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - Broadband

KW - Coronagraphy

KW - Exoplanets

KW - Extreme Adaptive Optics

KW - Integral Field Spectrograph

UR - http://www.scopus.com/inward/record.url?scp=84922753772&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84922753772&partnerID=8YFLogxK

U2 - 10.1117/12.2055769

DO - 10.1117/12.2055769

M3 - Conference contribution

SN - 9780819496157

VL - 9147

BT - Proceedings of SPIE - The International Society for Optical Engineering

PB - SPIE

ER -