A transiting giant planet in orbit around a 0.2-solar-mass host star

Bibcode
2025NatAs...9.1031B
DOI
10.1038/s41550-025-02552-4
Bryant, Edward M.; Jordán, Andrés; Hartman, Joel D.; Bayliss, Daniel; Sedaghati, Elyar; Barkaoui, Khalid; Chouqar, Jamila; Pozuelos, Francisco J.; Thorngren, Daniel P.; Timmermans, Mathilde; Almenara, Jose Manuel; Chilingarian, Igor V.; Collins, Karen A.; Gan, Tianjun; Howell, Steve B.; Narita, Norio; Palle, Enric; Rackham, Benjamin V.; Triaud, Amaury H. M. J.; Bakos, Gaspar Á.; Brahm, Rafael; Hobson, Melissa J.; Van Eylen, Vincent; Amado, Pedro J.; Arnold, Luc; Bonfils, Xavier; Burdanov, Artem; Cadieux, Charles; Caldwell, Douglas A.; Casanova, Victor; Charbonneau, David; Clark, Catherine A.; Collins, Kevin I.; Daylan, Tansu; Dransfield, Georgina; Demory, Brice-Olivier; Ducrot, Elsa; Fernández-Rodríguez, Gareb; Fukuda, Izuru; Fukui, Akihiko; Gillon, Michaël; Gore, Rebecca; Hooton, Matthew J.; Ikuta, Kai; Jehin, Emmanuel; Jenkins, Jon M.; Levine, Alan M.; Littlefield, Colin; Murgas, Felipe; Nguyen, Kendra; Parviainen, Hannu; Queloz, Didier; Seager, S.; Sebastian, Daniel; Srdoc, Gregor; Vanderspek, R.; Winn, Joshua N.; de Wit, Julien; Zúñiga-Fernández, Sebastián
Bibliographical reference

Nature Astronomy

Advertised on:
7
2025
Number of authors
59
IAC number of authors
7
Citations
5
Refereed citations
1
Description
Planet formation models indicate that the formation of giant planets is substantially harder around low-mass stars due to the scaling of protoplanetary disc masses with stellar mass. The discovery of giant planets orbiting such low-mass stars thus imposes strong constraints on giant planet formation processes. Here we report the discovery of a transiting giant planet orbiting a 0.207 ± 0.011 M⊙ star. The planet, TOI-6894 b, has a mass and radius of MP = 0.168 ± 0.022 MJ (53.4 ± 7.1 M⊕) and RP = 0.855 ± 0.022 RJ and probably includes 12 ± 2 M⊕ of metals. The discovery of TOI-6894 b highlights the need for a better understanding of giant planet formation mechanisms and the protoplanetary disc environments in which they occur. The extremely deep transits (17% depth) make TOI-6894 b one of the most accessible exoplanetary giants for atmospheric characterization observations, which will be key for fully interpreting the formation history of this notable system and for the study of atmospheric methane chemistry.
Related projects
Projects' name image
Exoplanets and Astrobiology
The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable
Enric
Pallé Bago
In progress
Type
Refereed
Exoplanetary Systems & Solar System (SEYSS)

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