[en] Short-period gas giant planets have been shown to be significantly rarer for host stars less massive than the Sun. We report the discovery of two transiting giant planets - TOI-2379 b and TOI-2384 b - with low-mass (early M) host stars. Both planets were detected using Transiting Exoplanet Survey Satellite photometry and for both the transit signal was validated using ground-based photometric facilities. We confirm the planetary nature of these companions and measure their masses using radial velocity observations. We find that TOI-2379 b has an orbital period of 5.469 d and a mass and radius of 5.76 +- 0.20 MJ and 1.046 +- 0.023 RJ and TOI-2384 b has an orbital period of 2.136 d and a mass and radius of 1.966 +- 0.059 MJ and 1.025 +- 0.021 RJ. TOI-2379 b and TOI-2384 b have the highest and third highest planet-to-star mass ratios, respectively, out of all transiting exoplanets with a low-mass host star, placing them uniquely among the population of known exoplanets and making them highly important pieces of the puzzle for understanding the extremes of giant planet formation.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bryant, Edward M.; University College London, Mullard Space Science Laboratory
Bayliss, Daniel; University of Warwick, Department of Physics, University of Warwick, UK
Hartman, Joel D.; Princeton University, Department of Astrophysical Sciences
Sedaghati, Elyar; European Southern Observatory (ESO), Av. Alonso de Córdova 3107, Vitacura 763 0355, Santiago, Chile
Hobson, Melissa J.; Max-Planck-Institute for Astronomy, Heidelberg, Millennium Institute of Astrophysics, Chile
Jordán, Andrés; Millennium Institute of Astrophysics, Chile, -, -
Brahm, Rafael; Millennium Institute of Astrophysics, Chile, -, -
Bakos, Gaspar Á.; Princeton University, Department of Astrophysical Sciences
Almenara, Jose Manuel; Institute de Planetologie et d'Astrophysique de Grenoble, University of Geneva, Astronomical Observatory
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Bonfils, Xavier; Institute de Planetologie et d'Astrophysique de Grenoble
Cointepas, Marion; Institute de Planetologie et d'Astrophysique de Grenoble, University of Geneva, Astronomical Observatory
Collins, Karen A.; Harvard Smithsonian Center for Astrophysics
Dransfield, Georgina; University of Birmingham, School of Physics and Astronomy
Evans, Phil; El Sauce Observatory, Río Hurtado, Coquimbo Province, Chile
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Jehin, Emmanuel ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Murgas, Felipe; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Pozuelos, Francisco J.; University of Liege, Belgium, Institute of Astrophysics of Andalusia
Schwarz, Richard P.; Harvard Smithsonian Center for Astrophysics
Watkins, Cristilyn N.; Harvard Smithsonian Center for Astrophysics
Wünsche, Anaël; Observatoire des Baronnies Provençales (OBP), Laboratoire d'Astrophysique des Baronnies-Science Citoyenne et Actions pour la Nuit (LABSCAN), 1480 Route des Alpes, F-05150 Moydans, France
Butler, R. Paul; Carnegie Institution of Washington, Department of Terrestrial Magnetism
Crane, Jeffrey D.; Carnegie Institution of Washington, Observatories, California
Shectman, Steve; Carnegie Institution of Washington, Observatories, California
Teske, Johanna K.; Carnegie Institution of Washington, Department of Terrestrial Magnetism
Charbonneau, David; Harvard Smithsonian Center for Astrophysics
Essack, Zahra; Department of Physics and Astronomy, The University of New Mexico, 210 Yale Blvd NE, Albuquerque, NM 87106, USA
Jenkins, Jon M.; NASA Ames Research Center
Lewis, Hannah M.; Space Telescope Science Institute, Baltimore, Maryland
Seager, Sara; MIT, Department of Earth and Planetary Science, MIT, Center for Space Research/Kavli Institute, Massachusetts Institute of Technology
Ting, Eric B.; NASA Ames Research Center
Winn, Joshua N.; Princeton University, Department of Astrophysical Sciences
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