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-Smithsonian Center for Astrophysics

Harvard University

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, Galactic Astrophysics

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

Universidad Adolfo Ibanez

A. Mann

The University of North Carolina at Chapel Hill

F. Bouchy

University of Geneva

Malcolm Fridlund

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

Leiden University

Keivan G. Stassun

Fisk University

Vanderbilt 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 at Chapel Hill

Andrés Jordán

Millennium Institute for Astrophysics

Universidad Adolfo Ibanez

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 53

Exoplanets from space – CHEOPS and PLATO, ESA’s next two projects

Swedish National Space Board, 2017-01-01 -- 2022-12-31.

Subject Categories

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

DOI

10.3847/1538-3881/ab9b84

More information

Latest update

8/24/2020