arXiv 0812.13052008-12-07astro-ph

凌日系外行星勘测卫星的预期行星探测率和误报探测率

Expected Planet and False Positive Detection Rates for the Transiting Exoplanet Survey Satellite

Timothy M. Brown, David W. Latham

备注：: 11 pages, 2 figures. Submitted to PASP. Replacement adds acknowledgments, fixes typos

摘要：

拟议中的凌日系外行星调查卫星（TESS）将调查整个天空，以定位最近和最明亮的凌日系外行星，其轨道周期长达约36天。在这里，我们估计了TESS将报告的天体物理误报的数量和种类，以及太阳系外行星的数量。然后，这些估计数被用来确定确认和描述行星所需的地面后续观测工作的规模。我们估计，所需的观测资源将是大约1400个望远镜夜的成像与0.5米至1米级望远镜，300个望远镜夜的1米至2米级望远镜的主恒星的分类和径向速度测量约1公里/秒的精度，用2米至4米级望远镜进行了380个望远镜之夜的径向速度研究，精度为几米/秒。TESS以最佳速度精度发现的最小行星的后续光谱学将受到4米至10米级望远镜的望远镜夜晚数量的限制，这些望远镜配备了HARPS和HIRES等仪器，但这些努力的回报将是确定超级地球的质量，其精度足以区分岩石沙漠行星和水世界。

英文摘要：

The proposed Transiting Exoplanet Survey Satellite (TESS) will survey the entire sky to locate the nearest and brightest transiting extrasolar planets with orbital periods up to about 36 days. Here we estimate the number and kind of astrophysical false positives that TESS will report, along with the number of extrasolar planets. These estimates are then used to size the ground-based follow-up observing efforts needed to confirm and characterize the planets. We estimate that the needed observing resources will be about 1400 telescope-nights of imaging with 0.5m to 1m-class telescopes, 300 telescope-nights with 1m to 2m-class telescopes for the classification of the host stars and for radial velocity measurements with roughly 1 km/s precision, and 380 telescope-nights with 2m to 4m-class telescopes for radial velocity studies with precision of a few m/s. Follow-up spectroscopy of the smallest planets discovered by TESS at the best possible velocity precision will be limited by the number of telescope nights available on 4m to 10m class telescopes with instruments such as HARPS and HIRES, but the pay-off of such efforts will be the determination of masses for Super Earths with sufficient accuracy to distinguish rocky desert planets from water worlds.

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