TESS Asteroseismic Analysis of the Known Exoplanet Host Star HD 222076

Research output: Contribution to journalArticle

Authors

  • Chen Jiang
  • Timothy R. Bedding
  • Keivan G. Stassun
  • Dimitri Veras
  • Enrico Corsaro
  • Derek L. Buzasi
  • Przemysław Mikołajczyk
  • Qian-sheng
  • Faqiang Zhang
  • Jian-wen
  • JH Ou
  • Tiago L. Campante
  • Thaíse S. Rodrigues
  • Benard Nsamba
  • Diego Bossini
  • Stephen R. Kane
  • Jia Mian Joel Ong
  • Mutlu Yıldız
  • Zeynep Çeiik Orhan
  • Sibel Örtel
  • Tao Wu
  • Xinyi Zhang
  • Sarbani Basu
  • Margarida S. Cunha
  • Jørgen Christensen-Dalsgaard

Colleges, School and Institutes

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 ($M_\star = 1.12 \pm 0.12\, M_\odot$), radius ($R_\star = 4.34 \pm 0.21\,R_\odot$), 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.

Bibliographic note

18 pages, 6 figures, 2 tables

Details

Original languageEnglish
JournalThe Astrophysical Journal
Volume896
Issue number1
Publication statusPublished - 15 Jun 2020

Keywords

  • astro-ph.SR, astro-ph.EP