Astronomy and Astrophysics; Space and Planetary Science
Abstract :
[en] We report the discovery of two intermediate-mass transiting brown dwarfs (BDs), TOI-569b and TOI-1406b, from NASA's Transiting Exoplanet Survey Satellite mission. TOI-569b has an orbital period of P=.55604±0.00016 days, a mass of Mb = 64.1±1.9 MJ, and a radius of Rb = 0.75±0.02 RJ. Its host star, TOI-569, has a mass of Må = 1.21±0.05 M, a radius of Rå = 1.47±0.03 R, [Fe H 0.29 0.09] = + dex, and an effective temperature of Teff = 5768±10K. TOI-1406b has an orbital period of P=10.57415±0.00063 days, a mass of Mb = 46.0± 2.7 MJ, and a radius of Rb = 0.86±0.03 RJ. The host star for this BD has a mass of Må = 1.18±0.09 M, a radius of Rå = 1.35±0.03 R, [Fe/H] =-0.08± 0.09 dex, and an effective temperature of Teff = 6290±100 K. Both BDs are in circular orbits around their host stars and are older than 3 Gyr based on stellar isochrone models of the stars. TOI-569 is one of two slightly evolved stars known to host a transiting BD (the other being KOI-415). TOI-1406b is one of three known transiting BDs to occupy the mass range of 40-50 MJ and one of two to have a circular orbit at a period near 10 days (with the first being KOI-205b). Both BDs have reliable ages from stellar isochrones, in addition to their well-constrained masses and radii, making them particularly valuable as tests for substellar isochrones in the BD mass-radius diagram.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Carmichael, Theron W. ; Department of Astronomy, Harvard University, Cambridge, United States ; Center for Astrophysics, Harvard and Smithsonian, Cambridge, United States
Quinn, Samuel N. ; Center for Astrophysics, Harvard and Smithsonian, Cambridge, United States
Mustill, Alexander J.; Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, Box 43, Lund, Sweden
Huang, Chelsea ; Department of Physics, And Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, United States
Zhou, George ; Center for Astrophysics, Harvard and Smithsonian, Cambridge, United States
Persson, Carina M.; Chalmers University of Technology, Department of Space, Earth and Environment, Onsala Space Observatory, Onsala, Sweden
Nielsen, Louise D.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Collins, Karen A. ; Center for Astrophysics, Harvard and Smithsonian, Cambridge, United States
Ziegler, Carl ; Dunlap Institute for Astronomy and Astrophysics, University of Toronto, Toronto, Canada
Collins, Kevin I. ; George Mason University, Fairfax, United States
Rodriguez, Joseph E. ; Center for Astrophysics, Harvard and Smithsonian, Cambridge, United States
Shporer, Avi ; Department of Physics, And Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, United States
Brahm, Rafael ; Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Santiago, Peñalolén, Chile ; Millennium Institute for Astrophysics, Chile
Mann, Andrew W. ; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, United States
Bouchy, Francois; Geneva Observatory, University of Geneva, Versoix, Switzerland
Fridlund, Malcolm ; Chalmers University of Technology, Department of Space, Earth and Environment, Onsala Space Observatory, Onsala, Sweden ; Leiden Observatory, University of Leiden, Leiden, Netherlands
Stassun, Keivan G. ; Vanderbilt University, Department of Physics and Astronomy, Nashville, United States ; Fisk University, Department of Physics, Nashville, United States
Hellier, Coel ; Astrophysics Group, Keele University, Staffordshire, United Kingdom
Seidel, Julia V.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Stalport, Manu ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; Geneva Observatory, University of Geneva, Versoix, Switzerland
Udry, Stephane ; Geneva Observatory, University of Geneva, Versoix, Switzerland
Pepe, Francesco; Geneva Observatory, University of Geneva, Versoix, Switzerland
Ireland, Michael ; Research School of Astronomy and Astrophysics, Australian National University, Australia
Žerjal, Maruša; Research School of Astronomy and Astrophysics, Australian National University, Australia
Briceño, César; Cerro Tololo Inter-American Observatory, La Serena, Chile
Law, Nicholas ; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, United States
Jordán, Andrés ; Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Santiago, Peñalolén, Chile ; Millennium Institute for Astrophysics, Chile
Espinoza, Néstor ; Space Telescope Science Institute, Baltimore, United States
Henning, Thomas; Max-Planck-Institut für Astronomie, Heidelberg, Germany
Sarkis, Paula ; Max-Planck-Institut für Astronomie, Heidelberg, Germany
Latham, David W. ; Center for Astrophysics, Harvard and Smithsonian, Cambridge, United States
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