W. H. Ball, W. J. Chaplin, M. B. Nielsen, L. González-Cuesta, S. Mathur, A. R. G. Santos, R. A. Garcia, D. L. Buzasi, B. Mosser, M. Deal, A. Stokholm, J. L. Rørsted, V. Silva Aguirre, B. Nsamba, T. L. Campante, M. S. Cunha, J. M. J. Ong, S. Basu, S. Örtel, Z. Çelik Orhan, M. Yildiz, K. G. Stassun, S. R. Kane, D. Huber
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 2136d orbit. We combine results from multiple stellar modelling teams to produce robust asteroseismic estimates of the star’s properties, including its mass M=1.48±0.04M⊙, radius R=2.68±0.03R⊙, and age t=3.07±0.39Gyr. 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.
Keywords
stars: oscillations; stars: individual (HD 38529); Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics
Monthly Notices of the Royal Astronomical Society
Volume 499, Issue 4, Page 6084
2020 December
