Mr. James Greg Douthit Profile

James Greg Douthit

at Cornell Univ

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Author

Publications (3)

Proceedings Article | 16 December 2020 Presentation

Fabry-Perot interferometer for high spectral resolution in the infrared and submillimeter

Thomas Nikola, Gordon Stacey, Matthew Greenhouse, Alexander Kutyrev, James Douthit, Charles Henderson, George Gull, Wen-Ting Hsieh, Ellen Lee, Kayla Rossi

Proceedings Volume 11453, 114530E (2020) https://doi.org/10.1117/12.2561869

KEYWORDS: Fabry–Perot interferometry, Image resolution, Spatial resolution, Cryogenics, Mirrors, Infrared spectroscopy, Spectroscopy, Observatories, Infrared astronomy, Spectroscopes

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Proceedings Article | 15 August 2018 Presentation + Paper

Development of the Fabry-Perot interferometers for the HIRMES spectrometer on SOFIA

Greg Douthit, Gordon Stacey, Thomas Nikola, Chuck Henderson, George Gull, Kayla Rossi, Alexander Kutryrev, Samuel Moseley

Proceedings Volume 10708, 107081P (2018) https://doi.org/10.1117/12.2314213

KEYWORDS: Ferroelectric materials, Stars, Mirrors, Bridges, Capacitors, Spectroscopy, Spectral resolution, Planets, Sensors, Fabry–Perot interferometry

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Proceedings Article | 10 July 2018 Presentation

HIRMES: the third generation instrument for SOFIA (Conference Presentation)

Thomas Nikola, Edwin Bergin, Gordon Bjoraker, James Douthit, George Gull, Charles Henderson, Wen-Ting Hsieh, Alexander Kutyrev, Gary Melnick, Stefanie Milam, Samuel Moseley, David Neufeld, Klaus Pontoppidan, Stephen Rinehart, Aki Roberge, Gordon Stacey, Johannes Staguhn, Dan Watson, Edward Wollack

Proceedings Volume 10708, 107080O (2018) https://doi.org/10.1117/12.2314206

KEYWORDS: Spectral resolution, Hydrogen, Solar system, Observatories, Infrared astronomy, Mid-IR, Spectroscopy, Bolometers, Sensors, Detector arrays

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We will present a status update on the development of HIRMES, the third generation instrument for SOFIA (Stratospheric Observatory for Infrared Astronomy). HIRMES (HIgh Resolution Mid-infrarEd Spectrometer) will cover the wavelength range between 25 micron and 122 micron with a spectral resolution of up to R~100,000. It will use two arrays of Transition Edge Sensed (TES) bolometers. One of the arrays consists of 8 16-pixel strips, for the high-resolution mode, where the pixel area and backshorts are optimized for 8 different wavelength regimes. The second detector consists of a 16x64 array with excellent sensitivity over the full wavelength range, and it will be used for the mid-resolution (R~19,000) and low-resolution (R~2,000 and R~600) observing modes. Both detector arrays will have background limited performance with NEPs of < 2E-17 W/Hz^(1/2) for the low-resolution array and < 3E-18 W/Hz^(1/2) for the high-resolution array. HIRMES will employ several Fabry-Perot Interferometers (FPI) for the low- (R~2000), mid- (R~19,000), and high-resolution (R~100,000) observing modes. In addition, three gratings with resolutions of R~600 will be used to order-sort FPI transmission peaks, and also to obtain low resolution broad bandwidth spectra. HIRMES's main science goals are to study the evolution of protoplanetary disks as well as to investigate the origin of Hydrogen and Deuterium in the Solar System. The high spectral resolution observations of the HD 1-0 R(0) line at 112 micron will determine the gas mass and kinematics in protoplanetary disks, while the observations of the [OI] 63 micron and H2O lines reveal the amount of Oxygen and H20 within the snowline. Low spectral resolution observations of solid-state H20 ice features at ~43 and ~63 micron will determine the amount of water ice beyond the snowline. Measurements of the molecular hydrogen line and numerous HD lines at mid-resolution will help to estimate the H/D ratio in the Solar System. In addition, the low-resolution FPI is well suited to map fine-structure line emission from nearby galaxies.

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