Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission
Journal article, 2020
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.
Author
Theron W. Carmichael
Harvard University
Harvard-Smithsonian Center for Astrophysics
Samuel N. Quinn
Harvard-Smithsonian Center for Astrophysics
A. J. Mustill
Lund University
Chelsea X. Huang
Massachusetts Institute of Technology (MIT)
George Zhou
Harvard-Smithsonian Center for Astrophysics
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
L. D. Nielsen
University of Geneva
Karen A. Collins
Harvard-Smithsonian Center for Astrophysics
C. Ziegler
University of Toronto
Kevin I. Collins
George Mason University
Joseph E. Rodriguez
Harvard-Smithsonian Center for Astrophysics
Avi Shporer
Massachusetts Institute of Technology (MIT)
Rafael Brahm
Millennium Institute for Astrophysics
Adolfo Ibáñez University
A. Mann
The University of North Carolina System
F. Bouchy
University of Geneva
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Leiden University
Keivan G. Stassun
Vanderbilt University
Fisk University
Coel Hellier
Keele University
Julia V. Seidel
University of Geneva
M. Stalport
University of Geneva
S. Udry
University of Geneva
Francesco Pepe
University of Geneva
Michael Ireland
Australian National University
Maruša Žerjal
Australian National University
C. Briceño
Cerro Tololo Inter American Observatory
N. Law
The University of North Carolina System
Andrés Jordán
Adolfo Ibáñez University
Millennium Institute for Astrophysics
Néstor Espinoza
Space Telescope Science Institute (STScI)
T. Henning
Max Planck Society
Paula Sarkis
Max Planck Society
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
Astronomical Journal
0004-6256 (ISSN) 1538-3881 (eISSN)
Vol. 160 1 53Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects
Swedish National Space Board (174/18), 2017-01-01 -- 2022-12-31.
Subject Categories
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
DOI
10.3847/1538-3881/ab9b84