论文标题
哪些恒星可以将地球视为过境的系外行星？
Which Stars can see Earth as a Transiting Exoplanet?
论文作者
论文摘要
过境观察结果发现迄今为止的大多数系外行星。对过境和日食的光谱观察是表征外球星大气的最常用工具，并将用于寻找生命。但是，必须将系外行星的轨道与我们的视线对齐，以观察过境。在这里，我们问，遥远的观察者能够以同样的方式在地球上寻找生命，从哪个出色的角度来看？ 我们使用Gaia DR2的苔丝输入目录和数据来识别最接近的恒星，这些恒星可以将地球视为一种过境的系外行星：我们在100 parsec中识别1,004个主要序列恒星，其中508保证了对地球过境的最小10小时长期观察。我们的星级列表包括大约77％的M型，12％K型，6％的G型，4％F型星和1％的A型恒星，接近黄辉。 SETI搜索之类的诸如Breakthrough listing Initiative之类的搜索已经集中在天空的这一部分上。现在，我们的目录为此搜索提供了目标列表。作为扩展任务的一部分，NASA的苔丝还将在黄道中寻找过境行星，以找到可以检测到我们过境地球上生命的行星。
Transit observations have found the majority of exoplanets to date. Spectroscopic observations of transits and eclipses are the most commonly used tool to characterize exoplanet atmospheres and will be used in the search for life. However, an exoplanet's orbit must be aligned with our line of sight to observe a transit. Here we ask, from which stellar vantage points would a distant observer be able to search for life on Earth in the same way? We use the TESS Input Catalog and data from Gaia DR2 to identify the closest stars that could see Earth as a transiting exoplanet: We identify 1,004 Main Sequence stars within 100 parsecs, of which 508 guarantee a minimum 10-hour long observation of Earth's transit. Our star list consists of about 77% M-type, 12% K-type, 6% G-type, 4% F-type stars, and 1% A-type stars close to the ecliptic. SETI searches like the Breakthrough Listen Initiative are already focusing on this part of the sky. Our catalog now provides a target list for this search. As part of the extended mission, NASA's TESS will also search for transiting planets in the ecliptic to find planets that could detect life on our transiting Earth as well.
