stars: brown dwarfs; stars: individual: GPX-1; stars: rotation; surveys: Astronomical Data bases; Galaxy: disc; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We announce the discovery of GPX-1 b, a transiting brown dwarf with a mass of 19.7 ± 1.6 MJup and a radius of 1.47 ± 0.10 RJup, the first substellar object discovered by the Galactic Plane eXoplanet (GPX) survey. The brown dwarf transits a moderately bright (V = 12.3 mag) fast-rotating F-type star with a projected rotational velocity $v\sin {\, i_*}=40\pm 10$ km s-1. We use the isochrone placement algorithm to characterize the host star, which has effective temperature 7000 ± 200 K, mass 1.68 ± 0.10 $\mathrm{\it M}_\odot$, radius 1.56 ± 0.10 $\mathrm{\it R}_\odot$, and approximate age $0.27_{-0.15}^{+0.09}$ Gyr. GPX-1 b has an orbital period of ~1.75 d and a transit depth of 0.90 ± 0.03 per cent. We describe the GPX transit detection observations, subsequent photometric and speckle-interferometric follow-up observations, and SOPHIE spectroscopic measurements, which allowed us to establish the presence of a substellar object around the host star. GPX-1 was observed at 30-min integrations by TESS in Sector 18, but the data are affected by blending with a 3.4 mag brighter star 42 arcsec away. GPX-1 b is one of about two dozen transiting brown dwarfs known to date, with a mass close to the theoretical brown dwarf/gas giant planet mass transition boundary. Since GPX-1 is a moderately bright and fast-rotating star, it can be followed-up by the means of the Doppler tomography.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Benni, P.; Acton Sky Portal (Private Observatory), Acton, MA 01720, USA
Burdanov, A. Y.; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain
Krushinsky, V. V.; Laboratory of Astrochemical Research, Ural Federal University, Mira Street 19, 620002 Yekaterinburg, Russia
Bonfanti, A.; Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042 Graz, Austria ; Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 17, B-4000 Liège, Belgium
Hébrard, G.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis boulevard Arago, F-75014 Paris, France ; Observatoire de Haute-Provence, CNRS, Université d'Aix-Marseille, F-04870 Saint-Michel-l'Observatoire, France
Almenara, J. M.; Université Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
Dalal, S.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis boulevard Arago, F-75014 Paris, France
Demangeon, O. D. S.; Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, Portugal
Tsantaki, M.; INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
Pepper, J.; Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015, USA
Stassun, K. G.; Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center Ln., Nashville, TN 37235, USA
Vanderburg, A.; Department of Astronomy, The University of Texas at Austin, Austin, TX 78712, USA
Belinski, A.; Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University, 13 Universitetskij pr., 119234 Moscow, Russia
Kashaev, F.; Faculty of Physics, M.V. Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Kim, T.; National Youth Space Center, Goheung, Jeollanam-do 59567, South Korea
Kang, W.; National Youth Space Center, Goheung, Jeollanam-do 59567, South Korea
Antonyuk, K.; Federal State Budget Scientific Institution Crimean Astrophysical Observatory of RAS, Nauchny, 298409 Crimea, Russia
Dyachenko, V. V.; Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz 369167, Russia
Rastegaev, D. A.; Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz 369167, Russia
Beskakotov, A.; Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz 369167, Russia ; Faculty of Mathematics & Mechanics, Saint Petersburg State University, Universitetskij pr. 28, Petrodvorets, St. Petersburg 198504, Russia
Mitrofanova, A. A.; Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz 369167, Russia
Pozuelos, F. J. ; Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 17, B-4000 Liège, Belgium ; Astrobiology Research Unit, Université de Liège, Allée du 6 Août 19C, B-4000 Liège, Belgium
Kuznetsov, E. D.; Ural Federal University, Mira Street, 19, 620002 Yekaterinburg, Russia
Popov, A.; Ural Federal University, Mira Street, 19, 620002 Yekaterinburg, Russia
Kiefer, F.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis boulevard Arago, F-75014 Paris, France
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Ricker, G.; Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Vanderspek, R.; Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Latham, D. W.; Center for Astrophysics | Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA
Seager, S.; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA ; Department of Aeronautical and Astronautical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Sokova, I.; Faculty of Mathematics & Mechanics, Saint Petersburg State University, Universitetskij pr. 28, Petrodvorets, St. Petersburg 198504, Russia ; Central Astronomical Observatory at Pulkovo of Russian Academy of Sciences, Pulkovskoje shosse d. 65, St. Petersburg 196140, Russia
Marchini, A.; Astronomical Observatory - DSFTA, University of Siena, Via Roma 56, I-53100 Siena, Italy
Papini, R.; Wild Boar Remote Observatory, I-50026 San Casciano in Val di Pesa (FI), Italy
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Torun, Ş.; Faculty of Science, Department of Astronomy and Space Science, Ankara University, TR-06100 Tandogan, Ankara, Turkey
Yalçınkaya, S.; Faculty of Science, Department of Astronomy and Space Science, Ankara University, TR-06100 Tandogan, Ankara, Turkey
Ivanov, K.; Irkutsk State University, K. Marx str. 1, Irkutsk 664003, Russia
Valyavin, G.; Federal State Budget Scientific Institution Crimean Astrophysical Observatory of RAS, Nauchny, 298409 Crimea, Russia ; Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz 369167, Russia ; Faculty of Mathematics & Mechanics, Saint Petersburg State University, Universitetskij pr. 28, Petrodvorets, St. Petersburg 198504, Russia
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Pakštienė, E.; Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio al. 3, Vilnius, LT-10257, Lithuania
Hentunen, V.-P.; Taurus Hill Observatory, Härkämäentie 88, FI-79480 Varkaus, Finland
Shadick, S.; Physics and Engineering Physics Department, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada
Bretton, M.; Baronnies Provençales Observatory, Hautes Alpes - Parc Naturel Régional des Baronnies Provençales, E-05150 Moydans, France
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