Robust asteroseismic properties of the bright planet host HD 38529


Ball W. H. , Chaplin W. J. , Nielsen M. B. , Gonzalez-Cuesta L., Mathur S., Santos A. R. G. , ...More

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol.499, no.4, pp.6084-6093, 2020 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 499 Issue: 4
  • Publication Date: 2020
  • Doi Number: 10.1093/mnras/staa3190
  • Title of Journal : MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Page Numbers: pp.6084-6093
  • Keywords: stars: oscillations, stars: individual (HD 38529), ASTROPHYSICAL REACTION-RATE, 3D CONVECTION SIMULATIONS, STELLAR STRUCTURE MODELS, NEARBY STARS, FUNDAMENTAL PARAMETERS, ATMOSPHERIC PARAMETERS, EXTRASOLAR PLANETS, ABUNDANCE ANALYSES, BROWN DWARFS, PARENT STARS

Abstract

The Transiting Exoplanet Survey Satellite (TESS) is recording short-cadence, high duty-cycle timeseries across most of the sky, which presents the opportunity to detect and study oscillations in interesting stars, in particular planet hosts. We have detected and analysed solar-like oscillations in the bright G4 subgiant HD 38529, which hosts an inner, roughly Jupiter-mass planet on a 14.3d orbit and an outer, low-mass brown dwarf on a 2136 d orbit. We combine results frommultiple stellarmodelling teams to produce robust asteroseismic estimates of the star's properties, including its mass M = 1.48 +/- 0.04 M-circle dot, radius R = 2.68 +/- 0.03 R-circle dot, and age t = 3.07 +/- 0.39 Gyr. Our results confirm that HD 38529 has a mass near the higher end of the range that can be found in the literature and also demonstrate that precise stellar properties can be measured given shorter timeseries than produced by CoRoT, Kepler, or K2.