TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M-dwarf host
TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M-dwarf host
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DOI：
10.3847/1538-3881/ac1940
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发表时间：
2021-07
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通讯作者：
S. Kanodia;G. Stefansson;C. Cañas;M. Maney;Andrea S. J. Lin;J. Ninan;Sinclaire Jones;A. Monson;B. Parker;H. Kobulnicky;J. Rothenberg;C. Beard;J. Lubin;Paul Robertson;Arvind F. Gupta;S. Mahadevan;W. Cochran;C. Bender;S. Diddams;C. Fredrick;S. Halverson;S. Hawley;F. Hearty;L. Hebb;R. Kopparapu;A. Metcalf;L. Ramsey;Arpita Roy;C. Schwab;Mary C. Schutte;R. Terrien;J. Wisniewski;J. Wright
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作者：
S. Kanodia;G. Stefansson;C. Cañas;M. Maney;Andrea S. J. Lin;J. Ninan;Sinclaire Jones;A. Monson;B. Parker;H. Kobulnicky;J. Rothenberg;C. Beard;J. Lubin;Paul Robertson;Arvind F. Gupta;S. Mahadevan;W. Cochran;C. Bender;S. Diddams;C. Fredrick;S. Halverson;S. Hawley;F. Hearty;L. Hebb;R. Kopparapu;A. Metcalf;L. Ramsey;Arpita Roy;C. Schwab;Mary C. Schutte;R. Terrien;J. Wisniewski;J. Wright
我们确认了TOI-532 b的行星性质，使用精确的近红外径向速度与可移动区行星的组合，凌日系外行星调查卫星（TESS）光变曲线，地面光度跟踪和高对比度成像。TOI-532是一颗微弱的M矮星，Teff = 3957 ± 69 K，[Fe/H] = 0.38 ± 0.04，它拥有一颗凌日周期为2.3天的气态行星。将径向速度与TESS和地面凌日数据联合拟合，发现一颗半径为5.82 ± 0.19 R <$，质量为61.5−9.3+9.7 M <$的行星。TOI-532 b是在M矮星周围探测到的最大和最大的超级海王星，具有质量和半径测量，它在海王星大小的行星和已知绕M矮星运行的较重木星行星之间架起了差距。它也遵循了之前提到的M-矮行星的气体巨星和主恒星金属丰度之间的趋势。此外，它位于海王星沙漠的边缘，在半径日照平面，有助于限制机制负责塑造这一地区的行星参数空间。
We confirm the planetary nature of TOI-532b, using a combination of precise near-infrared radial velocities with the Habitable-zone Planet Finder, Transiting Exoplanet Survey Satellite (TESS) light curves, ground-based photometric follow up, and high-contrast imaging. TOI-532 is a faint (J ∼ 11.5) metal-rich M dwarf with Teff = 3957 ± 69 K and [Fe/H] = 0.38 ± 0.04; it hosts a transiting gaseous planet with a period of ∼2.3 days. Joint fitting of the radial velocities with the TESS and ground-based transits reveal a planet with radius of 5.82 ± 0.19 R ⊕, and a mass of 61.5−9.3+9.7 M ⊕. TOI-532b is the largest and most massive super Neptune detected around an M dwarf with both mass and radius measurements, and it bridges the gap between the Neptune-sized planets and the heavier Jovian planets known to orbit M dwarfs. It also follows the previously noted trend between gas giants and host-star metallicity for M-dwarf planets. In addition, it is situated at the edge of the Neptune desert in the Radius–Insolation plane, helping place constraints on the mechanisms responsible for sculpting this region of planetary parameter space.