TESS对带有近距恒星伴星的TOI中凌日行星的探测灵敏度
The sensitivity of TESS to transiting planets in TOIs with close-in stellar companions
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中文总结 AI 辅助
本研究量化近距恒星伴星对TESS探测小型凌日行星能力的影响，构建了TESS对不同双星属性、行星参数的灵敏度网格，揭示了未分辨双星中行星探测的偏差。
中文摘要 AI 辅助
光学散斑干涉测量的高分辨率成像已揭示，许多凌日系外行星主星拥有近距恒星伴星。本研究旨在量化这些伴星的存在如何影响TESS探测小型行星凌日的能力。我们通过检查2052个基于散斑干涉观测看似为单恒星系统的TESS感兴趣天体（TOI），以及188个处于未分辨（<1.2角秒）恒星双星中的TOI来完成此研究。对于每个行星，我们从TOI目录中获取其凌日信噪比（SNR）、半径和轨道周期，对于恒星双星中的行星，我们校正了伴星造成的稀释效应导致的半径偏差。通过将比例关系应用于样本中每个TOI的实测凌日SNR，我们确定了每个TOI中凌日的可探测性与行星半径和轨道周期的函数关系。将此方法应用于全部样本时，该过程阐明了TESS对凌日行星的灵敏度与双星属性、主星光谱型、行星半径及行星轨道周期的函数关系。这些灵敏度网格量化了TESS对未分辨双星中小型行星探测的偏差，且显示对未分辨双星中次星凌日行星的灵敏度尤其低，尤其是在恒星间星等差增大时。这些灵敏度网格可下载以方便其他研究使用。
英文摘要
High resolution imaging with optical speckle interferometry has revealed that many transiting exoplanet host stars possess close-in stellar companions. The objective of this study is to quantify how the presence of these companions impacts the ability of TESS to detect the transits of small planets. We accomplish this by examining 2052 TESS Objects of Interest (TOIs) that appear to be single-star systems based on speckle interferometric observations as well as 188 TOIs in unresolved ($< 1.2\arcsec$) stellar binaries. For each planet, we take its transit signal-to-noise ratio (SNR), radius, and orbital period from the TOI catalog and, for planets in stellar binaries, we correct the radius for dilution by the companion. By applying a scaling relation to the measured transit SNR of each TOI in our sample, we determine the detectability of transits in each TOI as a function of both planet radius and orbital period. When applied to the full sample, this procedure elucidates the sensitivity of TESS to transiting planets as a function of binarity, host-star spectral type, planet radius, and planet orbital period. These sensitivity grids quantify the bias against the detection of small planets in unresolved binaries by TESS and show that there is a particularly low sensitivity to planets transiting secondary stars in unresolved binaries, especially as the magnitude difference between the stars increases. These sensitivity grids are available for download to facilitate their use in other studies.
