Exoplanets; Transit photometry; Radial velocity; M dwarf stars; Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We present the discovery of TOI-3235 b, a short-period Jupiter orbiting an M dwarf with a stellar mass close to the critical mass at which stars transition from partially to fully convective. TOI-3235 b was first identified as a candidate from TESS photometry and confirmed with radial velocities from ESPRESSO and ground-based photometry from HATSouth, MEarth-South, TRAPPIST-South, LCOGT, and ExTrA. We find that the planet has a mass of 0.665 ± 0.025 MJ and a radius of 1.017 ± 0.044 RJ. It orbits close to its host star, with an orbital period of 2.5926 days but has an equilibrium temperature of ≈ 604 K, well below the expected threshold for radius inflation of hot Jupiters. The host star has a mass of 0.3939 ± 0.0030 M⊙, a radius of 0.3697 ± 0.0018 R⊙, an effective temperature of 3389 K, and a J-band magnitude of 11.706 ± 0.025. Current planet formation models do not predict the existence of gas giants such as TOI-3235 b around such low-mass stars. With a high transmission spectroscopy metric, TOI-3235 b is one of the best-suited giants orbiting M dwarfs for atmospheric characterization.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hobson, Melissa J.; Max-Planck-Institute for Astronomy, Heidelberg, Millennium Institute of Astrophysics, Chile
Jordán, Andrés; Millennium Institute of Astrophysics, Chile, University Adolfo Ibanez, Chile, -
Bryant, E. M.; University of Warwick, Department of Physics, University of Warwick, UK, University College London, Mullard Space Science Laboratory
Brahm, R.; Millennium Institute of Astrophysics, Chile, University Adolfo Ibanez, Chile, -
Bayliss, D.; University of Warwick, Department of Physics
Hartman, J. D.; Princeton University, Department of Astrophysical Sciences
Bakos, G. Á.; Princeton University, Department of Astrophysical Sciences
Henning, Th.; Max-Planck-Institute for Astronomy, Heidelberg
Almenara, Jose Manuel; Institute de Planetologie et d'Astrophysique de Grenoble
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Benkhaldoun, Zouhair; Oukaimeden Observatory, High Energy Physics and Astrophysics Laboratory, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco
Bonfils, Xavier; Institute de Planetologie et d'Astrophysique de Grenoble
Bouchy, François; University of Geneva, Astronomical Observatory
Charbonneau, David; Harvard Smithsonian Center for Astrophysics
Cointepas, Marion; Institute de Planetologie et d'Astrophysique de Grenoble, University of Geneva, Astronomical Observatory
Collins, Karen A.; Harvard Smithsonian Center for Astrophysics
Eastman, Jason D.; Harvard Smithsonian Center for Astrophysics
Irwin, Jonathan M.; University of Cambridge, Institute of Astronomy
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Jenkins, Jon M.; NASA Ames Research Center
Latham, David W.; Harvard Smithsonian Center for Astrophysics
Moldovan, Dan; Google Inc., California
Murgas, Felipe; Institute de Planetologie et d'Astrophysique de Grenoble, Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Pozuelos, Francisco J.; University of Liege, Belgium, University of Liege, Laboratory of Planetary and Atmospheric Physics, Institute of Astrophysics of Andalusia
Ricker, George R.; MIT, Center for Space Research/Kavli Institute
Schwarz, Richard P.; Harvard Smithsonian Center for Astrophysics
Seager, S.; MIT, Center for Space Research/Kavli Institute, MIT, Department of Earth and Planetary Science, Massachusetts Institute of Technology
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