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|a Seager, Sara
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|a Massachusetts Institute of Technology. Department of Physics
|e contributor
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|a Seager, Sara
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|a Turnbull, Margaret
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|a Sparks, William
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|a Thomson, Mark
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|a Shaklan, Stuart B.
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|a Roberge, Aki
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|a Kuchner, Marc
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|a Kasdin, N. Jeremy
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|a Domagal-Goldman, Shawn
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|a Cash, Webster
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|a Warfield, Keith
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|a Lisman, Doug
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|a Scharf, Dan
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|a Webb, David
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|a Trabert, Rachel
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|a Martin, Stefan
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|a Cady, Eric
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|a Heneghan, Cate
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|a The Exo-S probe class starshade mission
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|b SPIE,
|c 2017-01-11T21:45:13Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/106349
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|a Exo-S is a direct imaging space-based mission to discover and characterize exoplanets. With its modest size, Exo-S bridges the gap between census missions like Kepler and a future space-based flagship direct imaging exoplanet mission. With the ability to reach down to Earth-size planets in the habitable zones of nearly two dozen nearby stars, Exo-S is a powerful first step in the search for and identification of Earth-like planets. Compelling science can be returned at the same time as the technological and scientific framework is developed for a larger flagship mission. The Exo-S Science and Technology Definition Team studied two viable starshade-telescope missions for exoplanet direct imaging, targeted to the $1B cost guideline. The first Exo-S mission concept is a starshade and telescope system dedicated to each other for the sole purpose of direct imaging for exoplanets (The "Starshade Dedicated Mission"). The starshade and commercial, 1.1-m diameter telescope co-launch, sharing the same low-cost launch vehicle, conserving cost. The Dedicated mission orbits in a heliocentric, Earth leading, Earth-drift away orbit. The telescope has a conventional instrument package that includes the planet camera, a basic spectrometer, and a guide camera. The second Exo-S mission concept is a starshade that launches separately to rendezvous with an existing on-orbit space telescope (the "Starshade Rendezvous Mission"). The existing telescope adopted for the study is the WFIRST-AFTA (Wide-Field Infrared Survey Telescope Astrophysics Focused Telescope Asset). The WFIRST-AFTA 2.4-m telescope is assumed to have previously launched to a Halo orbit about the Earth-Sun L2 point, away from the gravity gradient of Earth orbit which is unsuitable for formation flying of the starshade and telescope. The impact on WFIRST-AFTA for starshade readiness is minimized; the existing coronagraph instrument performs as the starshade science instrument, while formation guidance is handled by the existing coronagraph focal planes with minimal modification and an added transceiver.
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|a en_US
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|a Article
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|t Proceedings of SPIE--the Society of Photo-Optical Instrumentation Engineers
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