Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission
Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission
复制标题
DOI：
10.3847/1538-3881/ab9b84
复制
发表时间：
2020-02
期刊：
影响因子：
--
通讯作者：
T. Carmichael;S. Quinn;A. Mustill;Chelsea X. Huang;G. Zhou;C. Persson;L. Nielsen;K. Collins
中科院分区：
文献类型：
--
作者：
T. Carmichael;S. Quinn;A. Mustill;Chelsea X. Huang;G. Zhou;C. Persson;L. Nielsen;K. Collins
我们报告发现两个中等质量的过境棕矮星（BD），TOI-569 b和TOI-1406 b，从美国宇航局的过境系外行星调查卫星使命。TOI-569 b的轨道周期为P = 6.55604 ± 0.00016天，质量为Mb = 64.1 ± 1.9，半径为Rb = 0.75 ± 0.02。它的主星星TOI-569的质量为M = 1.21 ± 0.05，半径为R = 1.47 ± 0.03，dex，有效温度为Teff = 5768 ± 110 K。TOI-1406 b的轨道周期为P = 10.57415 ± 0.00063天，质量为Mb = 46.0 ± 2.7，半径为Rb = 0.86 ± 0.03。这颗BD的主星星质量为M = 1.18 ± 0.09，半径为R = 1.35 ± 0.03，dex，有效温度为Teff = 6290 ± 100 K。这两个BD都在围绕其宿主恒星的圆形轨道上，并且根据恒星等时线模型，年龄超过3 Gyr。TOI-569是已知的两颗稍微演化的恒星之一（另一颗是KOI-415）。TOI-1406 b是三个已知的质量范围为40-50的过境BD之一，也是两个周期接近10天的圆形轨道之一（第一个是KOI-205 b）。这两个BD都有可靠的恒星等时线年龄，除了它们的质量和半径约束良好，使它们特别有价值的测试亚恒星等时线在BD质量半径图。
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.