TOI-481 b & TOI-892 b: Two long period hot Jupiters from the Transiting Exoplanet Survey Satellite

Abstract

We present the discovery of two new 10-day period giant planets from the Transiting Exoplanet Survey Satellite ($TESS$) mission, whose masses were precisely determined using a wide diversity of ground-based facilities. TOI-481 b and TOI-892 b have similar radii ($0.99\pm 0.01$ ${\mathrm{R}}_{\mathrm{J}}$ and $1.07\pm 0.02$ ${\mathrm{R}}_{\mathrm{J}}$, respectively), and orbital periods (10.3311 days and 10.6266 days, respectively), but significantly different masses ($1.53\pm 0.03$ ${\mathrm{M}}_{\mathrm{J}}$ versus $0.95\pm 0.07$ ${\mathrm{M}}_{\mathrm{J}}$, respectively). Both planets orbit metal-rich stars ([Fe/H]= $+0.26\pm 0.05$ dex and [Fe/H] = $+0.24\pm 0.05$ dex, for TOI-481 and TOI-892, respectively) but at different evolutionary stages. TOI-481 is a ${\mathrm{M}}_{\star }$ = $1.14\pm 0.02$ ${\mathrm{M}}_{\odot }$, ${\mathrm{R}}_{\star }$ = $1.66\pm 0.02$ ${\mathrm{R}}_{\odot }$ G-type star ($T_{\mathrm{eff}}$ = $5735\pm 72$ K), that with an age of 6.7 Gyr, is in the turn-off point of the main sequence. TOI-892, on the other hand, is a F-type dwarf star ($T_{\mathrm{eff}}$ = $6261\pm 80$ K), which has a mass of ${\mathrm{M}}_{\star }$ = $1.28\pm 0.03$ ${\mathrm{M}}_{\odot }$, and a radius of ${\mathrm{R}}_{\star }$ = $1.39\pm 0.02$ ${\mathrm{R}}_{\odot }$. TOI-481 b and TOI-892 b join the scarcely populated region of transiting gas giants with orbital periods longer than 10 days, which is important to constrain theories of the formation and structure of hot Jupiters.

19 pages, 10 figures, accepted for publication in AJ

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