Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission

Carmichael, Theron W. and Quinn, Samuel N. and Mustill, Alexander J. and Huang, Chelsea ORCID: and Zhou, George ORCID: and Persson, Carina M. and Nielsen, Louise D. and Collins, Karen A. and Ziegler, Carl and Collins, Kevin I. and Rodriguez, Joseph E. and Shporer, Avi and Brahm, Rafael and Mann, Andrew W. and Bouchy, Francois and Fridlund, Malcolm and Stassun, Keivan G. and Hellier, Coel and Seidel, Julia V. and Stalport, Manu and Udry, Stephane and Pepe, Francesco and Ireland, Michael and Zerjal, Marusa and Briceno, Cesar and Law, Nicholas and Jordan, Andres and Espinoza, Nestor and Henning, Thomas and Sarkis, Paula and Latham, David W. (2020) Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission. The Astronomical Journal, 160 (1):53. pp. 1-15. ISSN 0004-6256

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 10 Feb 2022 04:09
Last Modified: 14 Feb 2022 02:16
Uncontrolled Keywords: Brown dwarfs; Radial velocity; Transit photometry; Spectroscopy; Photometry; Substellar companion stars; Astrophysics - Solar and Stellar; Astrophysics; Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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