利用 Gaia 探索 TESS SPOC FFI 目标样本
The TESS SPOC FFI Target Sample Explored with Gaia
AI总结：
本研究利用 Gaia DR2/DR3 表征 TESS-SPOC FFI 第1–55扇区目标，揭示样本选择偏差、双星比例与凌星半径探测极限，并构建主序目标样本。
摘要：
TESS 任务通过 TESS 科学处理运行中心（SPOC）生成的全帧图像（FFI）光变曲线，为社区提供了全天约 280 万颗恒星的高精度时间序列测光。这组光变曲线是发现凌日系外行星和开展其他恒星科学研究的极宝贵资源。然而，由于样本选择方式，这组光变曲线并不构成一个星等受限样本。为理解这种样本选择的影响，我们使用 Gaia DR2 和 DR3 研究 TESS-SPOC FFI 光变曲线集中恒星的性质，旨在为后续利用该样本开展研究提供重要背景。我们报告了第 1–55 扇区（覆盖第 1–4 周期）TESS-SPOC FFI 目标的性质。我们将 TESS-SPOC FFI 目标与 Gaia DR2 和 DR3 星表中所有亮于 Gaia 星等 14 的目标进行交叉匹配，以理解样本选择对整体恒星性质的影响，涉及 Gaia 星等、视差、半径、温度、非单星标志、光度、视向速度和恒星表面重力。亮于 G=14 的 Gaia 目标总计约 1670 万个，与 TESS-SPOC FFI 目标交叉匹配后剩余约 275 万个。我们研究了每个 TESS-SPOC FFI 目标的双星性，并根据在每个目标周围可能探测到的两次 TESS 凌星计算半径探测极限。最后，我们构建了一个全面的主序 TESS-SPOC FFI 目标样本，可用于未来研究。
英文摘要：
The TESS mission has provided the community with high-precision times series photometry for $\sim$2.8 million stars across the entire sky via the Full Frame Image (FFI) light curves produced by the TESS Science Processing Operations Centre (SPOC). This set of light curves is an extremely valuable resource for the discovery of transiting exoplanets and other stellar science. However, due to the sample selection, this set of light curves does not constitute a magnitude limited sample. In order to understand the effects of this sample selection, we use Gaia DR2 and DR3 to study the properties of the stars in the TESS-SPOC FFI light curve set, with the aim of providing vital context for further research using the sample. We report on the properties of the TESS-SPOC FFI Targets in Sectors 1 - 55 (covering Cycles 1 - 4). We cross-match the TESS-SPOC FFI Targets with the Gaia DR2 and DR3 catalogues of all targets brighter than Gaia magnitude 14 to understand the effects of sample selection on the overall stellar properties. This includes Gaia magnitude, parallax, radius, temperature, non-single star flags, luminosity, radial velocity and stellar surface gravity. In total, there are $\sim$16.7 million Gaia targets brighter than G=14, which when cross-matched with the TESS-SPOC FFI Targets leaves $\sim$2.75 million. We investigate the binarity of each TESS-SPOC FFI Target and calculate the radius detection limit from two detected TESS transits which could be detected around each target. Finally, we create a comprehensive main sequence TESS-SPOC FFI Target sample which can be utilised in future studies.
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