A 1.55 R⊕ habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole
A 1.55 R⊕ habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole
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一颗 1.55 R 的宜居带行星，由 TOI-715 托管，TOI-715 是黄道南极附近的一颗 M4 恒星
DOI：
10.1093/mnras/stad1439
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发表时间：
2023
影响因子：
4.8
通讯作者：
Ducrot, Elsa
中科院分区：
文献类型：
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作者：
Dransfield, Georgina;Timmermans, Mathilde;Triaud, Amaury H;Dévora-Pajares, Martín;Aganze, Christian;Barkaoui, Khalid;Burgasser, Adam J;Collins, Karen A;Cointepas, Marion;Ducrot, Elsa
新一代的天文台使我们能够详细研究系外行星的大气层和外星气候的多样性，使我们能够寻找外星生物和地质过程的证据。因此，现在是时候用这些仪器来确定最独特的行星。在此背景下，我们报告的发现和验证TOI-715 B，行星轨道附近（42 pc）的M4主机（TOI-715/TIC 271971130）与周期。TOI-715 B首先由TESS识别，并使用地基测光，高分辨率成像和统计验证进行验证。这颗行星的轨道周期与恒星的有效温度相结合，使这颗行星成为一个装置，将其置于岩石行星可居住区的最保守定义之内。TOI-715 B的半径福尔斯正好落在M矮星半径谷的两个测量位置之间;表征它的质量和组成将有助于理解低质量恒星半径谷的真实性质。我们证明了TOI-715 B适合使用精确的径向速度和透射光谱进行表征。此外，我们还发现了该系统中的第二颗候选行星，TIC 271971130.02，其潜在轨道周期为d，半径为，正好位于适居带的外边界内，轨道周期接近4：3。如果这第二颗行星被证实，它将是迄今为止TESS发现的最小的宜居带行星。
A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biological and geological processes. Now is therefore the time to identify the most unique planets to be characterized with these instruments. In this context, we report on the discovery and validation of TOI-715 b, aplanet orbiting its nearby (42 pc) M4 host (TOI-715/TIC 271971130) with a periodd. TOI-715 b was first identified byTESSand validated using ground-based photometry, high-resolution imaging and statistical validation. The planet’s orbital period combined with the stellar effective temperaturegive this planet an installation, placing it within the most conservative definitions of the habitable zone for rocky planets. TOI-715 b’s radius falls exactly between two measured locations of the M-dwarf radius valley; characterizing its mass and composition will help understand the true nature of the radius valley for low-mass stars. We demonstrate TOI-715 b is amenable for characterization using precise radial velocities and transmission spectroscopy. Additionally, we reveal a second candidate planet in the system, TIC 271971130.02, with a potential orbital period ofd and a radius of, just inside the outer boundary of the habitable zone, and near a 4:3 orbital period commensurability. Should this second planet be confirmed, it would represent the smallest habitable zone planet discovered byTESSto date.