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Effects of thermal and exozodiacal background on space telescope observations of exoEarths

Coker, Carl T. and Wang, Ji and Shaklan, Stuart (2018) Effects of thermal and exozodiacal background on space telescope observations of exoEarths. In: Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.10698. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 106985G. ISBN 9781510619494. http://resolver.caltech.edu/CaltechAUTHORS:20181207-104605941

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Abstract

One of the major goals of the exoplanet community in the coming decades is to detect Earth-like exoplanets (exoEarths) and look for biomarkers in their atmospheres. High-dispersion coronagraphy (HDC) may allow detection and characterization to be done simultaneously, as well as relax the starlight suppression requirements of the telescope and coronagraph. However, similar to other direct imaging techniques, HDC faces challenging thermal and/or exozodiacal background levels. In this paper, we present simulations of coronagraphic observations using a variety of space telescope apertures ranging in diameter from 1 to 15 m, specifically incorporating thermal and exozodiacal background. We investigate the effects of instrument temperature and aperture on the maximum usable wavelength, as well as the effects of exozodiacal disk inclination and thickness on observational SNR. We then identify the spectral resolutions which maximize observational SNR subject to detector noise and the required starlight suppression levels for the detection of various potential biomarker molecules (H_2O, O_2, CO_2, and CH_4).


Item Type:Book Section
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https://doi.org/10.1117/12.2313695DOIArticle
Additional Information:© 2018 Society of Photo-optical Instrumentation Engineers (SPIE). We thank Renyu Hu for providing the atmospheric models used in this paper. This work was supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, administered by the Universities Space Research Association under contract with NASA. Copyright 2018 California Institute of Technology. Government Sponsorship acknowledged. All rights reserved.
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Funding AgencyGrant Number
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:coronagraphy; exoplanets; high resolution spectroscopy; exozodiacal background; exoEarths; HDC; exozodi
Record Number:CaltechAUTHORS:20181207-104605941
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181207-104605941
Official Citation:Carl T. Coker, Ji Wang, Stuart Shaklan, "Effects of thermal and exozodiacal background on space telescope observations of exoEarths," Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106985G (21 August 2018); doi: 10.1117/12.2313695
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91569
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Dec 2018 21:29
Last Modified:07 Dec 2018 21:29

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