The Exo-S probe class starshade mission
The Exo-S probe class starshade mission
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Exo-S 探测器级遮星任务
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
C. Heneghan
中科院分区：
文献类型：
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作者：
S. Seager;M. Turnbull;W. Sparks;M. Thomson;S. Shaklan;A. Roberge;M. Kuchner;N. Kasdin;S. Domagal‐Goldman;W. Cash;K. Warfield;D. Lisman;D. Scharf;D. Webb;Rachel Trabert;Stefan R. Martin;E. Cady;C. Heneghan
Exo-S是一项直接成像太空任务，旨在发现和表征系外行星。凭借其适度的规模，Exo-S弥补了像开普勒这样的人口普查任务和未来天基旗舰直接成像系外行星任务之间的差距。Exo-S有能力深入到20多颗附近恒星的可居住区域，探测地球大小的行星，这是寻找和识别类地行星的有力的第一步。在为更大的旗舰任务开发技术和科学框架的同时，可以返回令人信服的科学成果。Exo-S科学和技术定义小组研究了两个可行的星荫望远镜任务，用于系外行星直接成像，目标是10亿美元的成本指导方针。第一个Exo-S任务概念是一个星罩和望远镜系统，彼此专用，唯一目的是直接成像系外行星（“星罩专用任务”）。“遮星”与商用直径1.1米的望远镜联合发射，共用同一艘低成本运载火箭，节约了成本。专用任务在一个以日心为中心，地球领先，地球漂移的轨道上运行。该望远镜有一个传统的仪器包，包括行星照相机、一个基本的光谱仪和一个引导照相机。第二个Exo-S任务概念是单独发射与现有在轨空间望远镜（“starshade交会任务”）交会。该研究采用的现有望远镜是WFIRST-AFTA（宽视场红外巡天望远镜天体物理聚焦望远镜资产）。假设WFIRST-AFTA 2.4 m望远镜先前发射到绕地-日L2点的Halo轨道，远离地球轨道的重力梯度，不适合遮挡星和望远镜的编队飞行。对WFIRST-AFTA遮阳准备的影响被最小化；现有的日冕仪作为遮星科学仪器，而编队引导由现有的日冕仪焦平面进行最小的修改和增加一个收发器。
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.
影响因子：
64.8
作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton
通讯作者：
M. Vogelsberger;S. Genel;V. Springel;P. Torrey;D. Sijacki;Da Xu;G. Snyder;Simeon Bird;D. Nelson;Lars Hernquist Mit;HarvardCfA;Hits;I. Cambridge;Stsci;Ias Princeton