TOI-530b: A giant planet transiting an M dwarf detected by TESS

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Tianjun Gan Zitao Lin Sharon Xuesong Wang Shude Mao Pascal Fouqué Keivan G. Stassun Steven Giacalone Akihiko Fukui Felipe Murgas David R. Ciardi Steve B. Howell Karen A. Collins Avi Shporer Luc Arnold Thomas Barclay David Charbonneau Jessie Christiansen Ian J. M. Crossfield Courtney D. Dressing Ashley Elliott

摘要： We report the discovery of TOI-530b, a transiting giant planet around an M0.5V dwarf, delivered by the Transiting Exoplanet Survey Satellite (TESS). The host star is located at a distance of $147.7\pm0.6$ pc with a radius of $R_{\ast}=0.54\pm0.03\ R_{\odot}$ and a mass of $M_{\ast}=0.53\pm0.02M_{\odot}$. We verify the planetary nature of the transit signals by combining ground-based multi-wavelength photometry, high resolution spectroscopy from SPIRou as well as high-angular-resolution imaging. With $V=15.4$ mag, TOI-530b is orbiting one of the faintest stars accessible by ground-based spectroscopy. Our model reveals that TOI-530b has a radius of $0.83\pm0.05\ R_{J}$ and a mass of $0.4\pm0.1\ M_{J}$ on a 6.39-d orbit. TOI-530b is the sixth transiting giant planet hosted by an M-type star, which is predicted to be infrequent according to core accretion theory, making it a valuable object to further study the formation and migration history of similar planets. We discuss the potential formation channel of such systems.

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