TESS Asteroseismic Analysis of the Known Exoplanet Host Star HD 222076

Abstract

The Transiting Exoplanet Survey Satellite (TESS) is an all-sky survey mission aiming to search for exoplanets that transit bright stars. The high-quality photometric data of TESS are excellent for the asteroseismic study of solar-like stars. In this work, we present an asteroseismic analysis of the red-giant star HD~222076 hosting a long-period (2.4 yr) giant planet discovered through radial velocities. Solar-like oscillations of HD~222076 are detected around $203\mu$Hz by TESS for the first time. Asteroseismic modeling, using global asteroseismic parameters as input, yields a determination of the stellar mass ($M_{\star }=1.12\pm 0.12M_{\odot }$), radius ($R_{\star }=4.34\pm 0.21R_{\odot }$), and age ($7.4\pm 2.7$Gyr), with precisions greatly improved from previous studies. The period spacing of the dipolar mixed modes extracted from the observed power spectrum reveals that the star is on the red-giant branch burning hydrogen in a shell surrounding the core. We find that the planet will not escape the tidal pull of the star and be engulfed into it within about $800$Myr, before the tip of the red-giant branch is reached.

18 pages, 6 figures, 2 tables

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