Warrick H. Ball, William J. Chaplin, Martin B. Nielsen, Lucia González-Cuesta, Savita Mathur, Ângela R. G. Santos, Rafael García, Derek Buzasi, Benoît Mosser, Morgan Deal, Amalie Stokholm, Jakob Rørsted Mosumgaard, Victor Silva Aguirre, Benard Nsamba, Tiago Campante, Margarida S. Cunha, Joel Ong, Sarbani Basu, Sibel Örtel, Z. Çelik Orhan, Mutlu Yıldız, Keivan Stassun, Stephen R. Kane, Daniel Huber
Robust asteroseismic properties of the bright planet host HD 38529
See arXiv version
10 pages, 6 figures, 4 tables, accepted for publication in MNRAS
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 14.3 d orbit and an outer, low-mass brown dwarf on a 2136 d orbit. We combine results from multiple stellar modelling teams to produce robust asteroseismic estimates of the star’s properties, including its mass \(M = 1.48 \pm 0.04 \mathrm{M}_\odot\), radius \(R = 2.68 \pm 0.03 \mathrm{R}_\odot\) and age \(t = 3.07 \pm 0.39 \,\mathrm{Gyr}\). 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.
