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Robust asteroseismic properties of the bright planet host HD 38529

W. H. Ball, W. J. Chaplin, M. B. Nielsen, L. GonzŠlez-Cuesta, S. Mathur, A. R. G. Santos, R. A. GarcŪa, D. L. Buzasi, B. Mosser, M. Deal, A. Stokholm, J. RÝrsted Mosumgaard, V. Silva Aguirre, B. Nsamba, T. L. Campante, M. S. Cunha, J. M. J. Ong, S. Basu, S. ÷rtel, Z. «elik Orhan, M. Yildiz, Stassun K. G., 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

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Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia