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Weighing in on the masses of retired A stars with asteroseismology : K2 observations of the exoplanet-host star HD 212771
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Campante, Tiago L., Veras, Dimitri, North, Thomas S. H., Miglio, Andrea, Morel, Thierry, Johnson, John A., Chaplin, William J., Davies, Guy R., Huber, Daniel, Kuszlewicz, James S., Lund, Mikkel N., Cooke, Benjamin F., Elsworth, Yvonne P., Rodrigues, Thaíse S. and Vanderburg, Andrew (2017) Weighing in on the masses of retired A stars with asteroseismology : K2 observations of the exoplanet-host star HD 212771. Monthly Notices of the Royal Astronomical Society, 469 (2). pp. 1360-1368.
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Official URL: https://doi.org/10.1093/mnras/stx876
Abstract
Doppler-based planet surveys point to an increasing occurrence rate of giant planets with stellar mass. Such surveys rely on evolved stars for a sample of intermediate-mass stars (so-called retired A stars), which are more amenable to Doppler observations than their main-sequence progenitors. However, it has been hypothesised that the masses of subgiant and low-luminosity red-giant stars targeted by these surveys --- typically derived from a combination of spectroscopy and isochrone fitting --- may be systematically overestimated. Here, we test this hypothesis for the particular case of the exoplanet-host star HD 212771 using K2 asteroseismology. The benchmark asteroseismic mass ($1.45^{+0.10}_{-0.09}\:\text{M}_{\odot}$) is significantly higher than the value reported in the discovery paper ($1.15\pm0.08\:\text{M}_{\odot}$), which has been used to inform the stellar mass-planet occurrence relation. This result, therefore, does not lend support to the above hypothesis. Implications for the fates of planetary systems are sensitively dependent on stellar mass. Based on the derived asteroseismic mass, we predict the post-main-sequence evolution of the Jovian planet orbiting HD 212771 under the effects of tidal forces and stellar mass loss.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science > Physics | ||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Extrasolar planets, Astroseismology | ||||||||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||||||||||||||
| Publisher: | Oxford University Press | ||||||||||||||||||||||||||||||
| ISSN: | 0035-8711 | ||||||||||||||||||||||||||||||
| Official Date: | 1 August 2017 | ||||||||||||||||||||||||||||||
| Dates: |
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| Date of first compliant deposit: | 15 May 2017 | ||||||||||||||||||||||||||||||
| Volume: | 469 | ||||||||||||||||||||||||||||||
| Number: | 2 | ||||||||||||||||||||||||||||||
| Page Range: | pp. 1360-1368 | ||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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