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Carmichael, Theron W.; Quinn, Samuel N.; Mustill, Alexander J.; Huang, Chelsea; Zhou, George; Persson, Carina M.; Nielsen, Louise D.; Collins, Karen A.; Ziegler, Carl; Collins, Kevin I.; Rodriguez, Joseph E.; Shporer, Avi; Brahm, Rafael; Mann, Andrew W.; Bouchy, Francois; Fridlund, Malcolm; Stassun, Keivan G.; Hellier, Coel; Seidel, Julia V.; Stalport, Manu; Udry, Stephane; Pepe, Francesco; Ireland, Michael; erjal, Maruša; Briceño, César; Law, Nicholas; Jordán, Andrés; Espinoza, Néstor; Henning, Thomas; Sarkis, Paula; Latham, David W.
The Astronomical journal, 07/2020, Letnik: 160, Številka: 1Journal Article
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 = 6.55604 0.00016 days, a mass of Mb = 64.1 1.9 , and a radius of Rb = 0.75 0.02 . Its host star, TOI-569, has a mass of M = 1.21 0.05 , a radius of R = 1.47 0.03 , dex, and an effective temperature of Teff = 5768 110 K. TOI-1406b has an orbital period of P = 10.57415 0.00063 days, a mass of Mb = 46.0 2.7 , and a radius of Rb = 0.86 0.03 . The host star for this BD has a mass of M = 1.18 0.09 , a radius of R = 1.35 0.03 , 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 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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