NGTS-13b: a hot 4.8 Jupiter-mass planet transiting a subgiant star
作者： Nolan Grieves , Louise D Nielsen , Jose I Vines , Edward M Bryant , Samuel Gill
DOI: 10.1051/0004-6361/202039586
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摘要: We report the discovery of massive hot Jupiter NGTS-13b by Next Generation Transit Survey (NGTS). The V = 12.7 host star is likely in subgiant evolutionary phase with log g$_{*}$ 4.04 $\pm$ 0.05, T$_{eff}$ 5819 73 K, M$_{*}$ 1.30$^{+0.11}_{-0.18}$ M$_{\odot}$, and R$_{*}$ 1.79 0.06 R$_{\odot}$. NGTS detected a transiting planet period P 4.12 days around star, which was later validated Transiting Exoplanet Satellite (TESS; TIC 454069765). confirm using radial velocities from CORALIE spectrograph. Using TESS full-frame image photometry combined we determine to have radius R$_{P}$ 1.142 0.046 R$_{Jup}$, mass M$_{P}$ 4.84 0.44 M$_{Jup}$ eccentricity e 0.086 0.034. Some previous studies suggest that $\sim$4 may be border between two separate formation scenarios (e.g., core accretion disk instability) giant planets share similar mechanisms as lower-mass brown dwarfs. just above 4 making it an important addition statistical sample needed understand differences various classes substellar companions. high metallicity, [Fe/H] 0.25 0.17, NGTS-13 does not support suggestions giants are found preferentially lower metallicity stars, but findings more evolved hosts higher occurrence close-in than unevolved stars.
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