A Revised Exoplanet Yield from the Transiting Exoplanet Survey Satellite (TESS)
A Revised Exoplanet Yield from the Transiting Exoplanet Survey Satellite (TESS)
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DOI：
10.3847/1538-4365/aae3e9
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发表时间：
2018-11-01
影响因子：
8.7
通讯作者：
Quintana, Elisa V.
中科院分区：
文献类型：
--
作者：
Barclay, Thomas;Pepper, Joshua;Quintana, Elisa V.
凌日系外行星勘测卫星（TESS）的目标是探测绕恒星运行的小行星，这些行星的亮度足以通过地面径向速度观测来确定质量。在这里，我们估计有多少系外行星的TESS使命将检测，检测到的行星的物理特性，以及这些行星轨道的恒星的属性。这项工作使用从TESS输入目录候选目标列表中提取的恒星，并修改了基于银河系模型的先前研究的收益。我们对TESS观测策略进行了建模，以2分钟的节奏选择了大约20万颗恒星，而其余的恒星则以30分钟的节奏在全帧图像数据中进行观测。我们在每个星星周围的轨道上放置了零个或多个行星，其物理特性遵循测量的系外行星发生率，并使用TESS噪声模型来预测检测到的系外行星的衍生特性。在TESS 2分钟节奏模式下，我们估计TESS将发现1250 +/- 70颗系外行星（90%置信度），其中包括250颗小于2 R圆的行星。此外，我们预测，在全帧图像数据中，还将发现另外3100颗行星围绕明亮的矮星运行，以及超过10，000颗围绕较暗恒星运行。我们预测TESS将发现500颗行星围绕M矮星运行，但大多数行星将围绕比太阳更大的恒星运行。我们模拟的行星样本包含数百颗适合径向速度跟踪的小行星，可能是小于4 R圆加上质量测量的行星数量的三倍多。这一模拟行星样本可用于规划后续观测和分析。
The Transiting Exoplanet Survey Satellite (TESS) has a goal of detecting small planets orbiting stars bright enough for mass determination via ground-based radial velocity observations. Here, we present estimates of how many exoplanets the TESS mission will detect, the physical properties of the detected planets, and the properties of the stars that those planets orbit. This work uses stars drawn from the TESS Input Catalog Candidate Target List and revises yields from prior studies that were based on Galactic models. We modeled the TESS observing strategy to select approximately 200,000 stars at 2-minute cadence, while the remaining stars are observed at 30-minute cadence in full-frame image data. We placed zero or more planets in orbit around each star, with physical properties following measured exoplanet occurrence rates, and used the TESS noise model to predict the derived properties of the detected exoplanets. In the TESS 2-minute cadence mode we estimate that TESS will find 1250 +/- 70 exoplanets (90% confidence), including 250 smaller than 2 R-circle plus. Furthermore, we predict that an additional 3100 planets will be found in full-frame image data orbiting bright dwarf stars and more than 10,000 around fainter stars. We predict that TESS will find 500 planets orbiting M dwarfs, but the majority of planets will orbit stars larger than the Sun. Our simulated sample of planets contains hundreds of small planets amenable to radial velocity follow-up, potentially more than tripling the number of planets smaller than 4 R-circle plus with mass measurements. This sample of simulated planets is available for use in planning follow-up observations and analyses.