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arXiv 2006.14546astro-ph.EPastro-ph.SR
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TOI-1728 b:宜居带行星证实了一个温暖的超级海王星绕着一个M矮星主机运行

TOI-1728b: The Habitable-zone Planet Finder confirms a warm super Neptune orbiting an M dwarf host

Shubham Kanodia, Caleb I. Canas, Gudmundur Stefansson, Joe P. Ninan, Leslie Hebb, Andrea S. J. Lin, Helen Baran, Marissa Maney, Ryan C. Terrien, 7 Suvrath Mahad… 展开作者

Shubham Kanodia, Caleb I. Canas, Gudmundur Stefansson, Joe P. Ninan, Leslie Hebb, Andrea S. J. Lin, Helen Baran, Marissa Maney, Ryan C. Terrien, 7 Suvrath Mahadevan, William D. Cochran, Michael Endl, Jiayin Dong, Chad F. Bender, Scott A. Diddams, Eric B. Ford, Connor Fredrick, Samuel Halverson, Fred Hearty, Andrew J. Metcalf, Andrew Monson, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Christian Schwab, Jason T. Wright

摘要:

我们确认TOI-1728 b的行星性质,使用地面测光,近红外多普勒测速仪和光谱学的组合与宜居带行星P1.TOI-1728是一个老的,不活跃的M0恒星与\teff{} $= 3980^{+31}_{-32}$ K,它的主机凌日超海王星在轨道周期的$\sim$ 3.49天。径向速度、TESS和地基凌日的联合拟合得到行星半径$5.05_{-0.17}^{+0.16}$ R $_{\oplus}$、质量$26.78_{-5.13}^{+5.43}$ M $_{\oplus}$和偏心率$0.057_{-0.039}^{+0.054}$。我们估计了恒星的性质,并在这颗行星过境期间执行了He 10830吸收的搜索,并声称零检测上限为1.1 $\%$,置信度为90%。在类似的气态行星GJ 3470 b的大气层中检测到了更深层次的He 10830 ~吸收。TOI-1728 b是最大的超级海王星-海王星和更大质量的气体巨行星之间的中间子类行星-在M矮星周围发现。由于其相对较大的质量和半径,TOI-1728代表了M矮星系外行星质量-半径图中的一个有价值的数据点,弥合了较轻的海王星大小的行星和较重的木星行星之间的差距。TOI-1728 b的体积密度很低,为$1.14_{-0.24}^{+0.26}$ g/cm $^3$,并且围绕着一颗明亮的主星(J $\sim 9.6$,V $\sim 12.4$)运行,TOI-1728 b也是一个很有前途的候选者,可以从地面和空间进行透射光谱分析,可以用来限制行星的形成和演化模型。

英文摘要:

We confirm the planetary nature of TOI-1728b using a combination of ground-based photometry, near-infrared Doppler velocimetry and spectroscopy with the Habitable-zone Planet Finder.TOI-1728 is an old, inactive M0 star with \teff{} $= 3980^{+31}_{-32}$ K, which hosts a transiting super Neptune at an orbital period of $\sim$ 3.49 days. Joint fitting of the radial velocities and TESS and ground-based transits yields a planetary radius of $5.05_{-0.17}^{+0.16}$ R$_{\oplus}$, mass $26.78_{-5.13}^{+5.43}$ M$_{\oplus}$ and eccentricity $0.057_{-0.039}^{+0.054}$. We estimate the stellar properties, and perform a search for He 10830 Åabsorption during the transit of this planet and claim a null detection with an upper limit of 1.1$\%$ with 90\% confidence. A deeper level of He 10830 Å~ absorption has been detected in the planet atmosphere of GJ 3470b, a comparable gaseous planet. TOI-1728b is the largest super Neptune -- the intermediate subclass of planets between Neptune and the more massive gas-giant planets -- discovered around an M dwarf. With its relatively large mass and radius, TOI-1728 represents a valuable datapoint in the M-dwarf exoplanet mass-radius diagram, bridging the gap between the lighter Neptune-sized planets and the heavier Jovian planets known to orbit M-dwarfs. With a low bulk density of $1.14_{-0.24}^{+0.26}$ g/cm$^3$, and orbiting a bright host star (J $\sim 9.6$, V $\sim 12.4$), TOI-1728b is also a promising candidate for transmission spectroscopy both from the ground and from space, which can be used to constrain planet formation and evolutionary models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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