A transiting giant planet in orbit around a 0.2-solar-mass host star
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arXiv
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| Natura: | Preprint |
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2025
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| author | 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-Oliver 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 |
| author_facet | 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-Oliver 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 |
| contents | Planet formation models suggest that the formation of giant planets is significantly 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 $0.207 \pm 0.011 M_{\odot}$ star. The planet, TOI-6894 b, has a mass and radius of $M_P = 0.168 \pm 0.022 M_J (53.4 \pm 7.1 M_{\oplus})$ and $R_P = 0.855 \pm 0.022 R_J$, and likely includes $12 \pm 2 M_{\oplus}$ 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 characterisation observations, which will be key for fully interpreting the formation history of this remarkable system and for the study of atmospheric methane chemistry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_07931 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A transiting giant planet in orbit around a 0.2-solar-mass host star 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-Oliver 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 Earth and Planetary Astrophysics Solar and Stellar Astrophysics Planet formation models suggest that the formation of giant planets is significantly 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 $0.207 \pm 0.011 M_{\odot}$ star. The planet, TOI-6894 b, has a mass and radius of $M_P = 0.168 \pm 0.022 M_J (53.4 \pm 7.1 M_{\oplus})$ and $R_P = 0.855 \pm 0.022 R_J$, and likely includes $12 \pm 2 M_{\oplus}$ 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 characterisation observations, which will be key for fully interpreting the formation history of this remarkable system and for the study of atmospheric methane chemistry. |
| title | A transiting giant planet in orbit around a 0.2-solar-mass host star |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2506.07931 |