[en] 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⊙. 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bryant, Edward M.; Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St Mary, UK, Department of Physics, University of Warwick, Coventry, UK
Jordán, Andrés; University Adolfo Ibanez, Chile, Millennium Institute of Astrophysics, Chile, -
Hartman, Joel D.; Princeton University, Department of Astrophysical Sciences
Bayliss, Daniel; University of Warwick, Department of Physics, University of Warwick, Department of Physics
Sedaghati, Elyar; European Southern Observatory, Chile
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > COMets METeors and Asteroids (COMETA)
Chouqar, Jamila ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Pozuelos, Francisco J.; Institute of Astrophysics of Andalusia
Thorngren, Daniel P.; Johns Hopkins University, Department of Physics and Astronomy
Timmermans, Mathilde ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > COMets METeors and Asteroids (COMETA)
Almenara, Jose Manuel; Institute de Planetologie et d'Astrophysique de Grenoble, -
Chilingarian, Igor V.; Harvard Smithsonian Center for Astrophysics, MSU, Sternberg Astronomical Institute
Collins, Karen A.; Harvard Smithsonian Center for Astrophysics
Gan, Tianjun; Tsinghua University, China
Howell, Steve B.; NASA Ames Research Center
Narita, Norio; Astrophysical Institute of the Canaries, University of Tokyo, Japan, -
Palle, Enric; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Rackham, Benjamin V.; MIT, Department of Earth and Planetary Science, MIT, Center for Space Research/Kavli Institute
Triaud, Amaury H. M. J.; University of Birmingham, School of Physics and Astronomy
Bakos, Gaspar Á.; Princeton University, Department of Astrophysical Sciences
Brahm, Rafael; University Adolfo Ibanez, Chile, Millennium Institute of Astrophysics, Chile
Hobson, Melissa J.; Observatoire de Genève, Département d'Astronomie, Université de Genève, Versoix, Switzerland
Van Eylen, Vincent; Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Holmbury St Mary, UK
Amado, Pedro J.; Institute of Astrophysics of Andalusia
Arnold, Luc; Canada-France-Hawaii Telescope, Kamuela, HI, USA
Bonfils, Xavier; Institute de Planetologie et d'Astrophysique de Grenoble
Burdanov, Artem; MIT, Department of Earth and Planetary Science
Cadieux, Charles; Université de Montréal, Département de Physique, IREX, Montreal, Quebec, Canada
Caldwell, Douglas A.; NASA Ames Research Center, SETI Institute, California
Casanova, Victor; Institute of Astrophysics of Andalusia
Charbonneau, David; Harvard Smithsonian Center for Astrophysics
Clark, Catherine A.; Infrared Processing and Analysis Center
Collins, Kevin I.; George Mason University, Virginia
Daylan, Tansu; Washington University in Saint Louis, Department of Physics, Washington University in Saint Louis, Department of Earth and Planetary Science
Dransfield, Georgina; University of Birmingham, School of Physics and Astronomy
Demory, Brice-Olivier; University of Bern, Physics Institute
Ducrot, Elsa ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization ; Observatoire de Paris, Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, CEA Saclay, Service d'Astrophysique
Fernández-Rodríguez, Gareb; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Fukuda, Izuru; University of Tokyo, Japan
Fukui, Akihiko; Astrophysical Institute of the Canaries, University of Tokyo, Japan
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Gore, Rebecca; NASA Ames Research Center, Bay Area Environmental Research Institute, California
Hooton, Matthew J.; University of Cambridge, Department of Physics
Ikuta, Kai; University of Tokyo, Japan
Jehin, Emmanuel ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Jenkins, Jon M.; NASA Ames Research Center
Levine, Alan M.; MIT, Center for Space Research/Kavli Institute
Littlefield, Colin; NASA Ames Research Center, Bay Area Environmental Research Institute, California
Murgas, Felipe; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Nguyen, Kendra; Yale University, Department of Astronomy
Parviainen, Hannu; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Queloz, Didier; University of Cambridge, Department of Physics, ETH Zurich, Department of Physics
Seager, S.; MIT, Center for Space Research/Kavli Institute, MIT, Department of Earth and Planetary Science, MIT, Department of Earth and Planetary Science
Sebastian, Daniel; University of Birmingham, School of Physics and Astronomy
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