http://arxiv.org/abs/2104.12078
We present the discovery of a highly irradiated and moderately inflated ultra-hot Jupiter, TOI-1431b/MASCARA-5b (HD 201033b), first detected by NASA’s Transiting Exoplanet Survey Satellite mission (TESS) and the Multi-site All-Sky CAmeRA (MASCARA). The signal was established to be of planetary origin through radial velocity measurements obtained using SONG, SOPHIE, FIES, NRES, and EXPRES, which show a reflex motion of $K=294.1\pm1.1$ m s$^{-1}$. A joint analysis of TESS, MuSCAT2, and LCOGT photometry, radial velocity measurements, and the spectral energy distribution of the host star reveals that TOI-1431b has a mass of $M_{p}=3.14_{-0.18}^{+0.19}$ $\rm{M_J}$ ($1000\pm60$ M${\oplus}$), an inflated radius of $R{p}=1.51\pm0.06$ $\rm{R_J}$ ($16.9_{-0.6}^{+0.7}$ R${\oplus}$), and an orbital period of $P=2.65022\pm0.00001$ d. The planet orbits a bright ($\mathrm{V}=8.049$ mag) and young ($0.29^{+0.32}{-0.19}$ Gyr) Am type star with $T_{\rm eff}=7690^{+400}{-250}$ $\rm{K}$, resulting in a highly irradiated planet with an incident flux of $\langle F \rangle=7.24^{+0.68}{-0.64}\times$10$^9$ erg s$^{-1}$ cm$^{-2}$ ($5300^{+500}{-470}\mathrm{S{\oplus}}$) and an equilibrium temperature of $T_{eq}=2370\pm100$ K. TESS photometry also reveals a secondary eclipse with a depth of $124\pm5$ppm as well as the full phase curve of the planet’s thermal emission in the red-optical. This has allowed us to measure the dayside and nightside temperature of its atmosphere as $T_\mathrm{day}=2983^{+63}{-68}$ K and $T\mathrm{night}=2556^{+62}_{-65}$ K, the second hottest measured nightside temperature. The planet’s low day/night temperature contrast ($\sim$400 K) suggests very efficient heat transport between the dayside and nightside hemispheres.
B. Addison, E. Knudstrup, I. Wong, et. al.
Tue, 27 Apr 21
81/85
Comments: Submitted for publication in the Astronomical Journal. 38 pages, 22 figures, and 5 tables
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