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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

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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
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:
DateEvent
1 August 2017Published
10 April 2017Available
6 April 2017Accepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
NNX14AB92GNational Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
UNSPECIFIEDScience and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
Grant DNRF106Danmarks Grundforskningsfondhttp://dx.doi.org/10.13039/501100001732
320964Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
UNSPECIFIEDFederaal Wetenschapsbeleidhttp://dx.doi.org/10.13039/501100002749
DE14010136Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
DFF-4181-0415Det Frie Forskningsrådhttp://dx.doi.org/10.13039/501100004836
UNSPECIFIEDConselho Nacional de Desenvolvimento Científico e Tecnológicohttp://dx.doi.org/10.13039/501100003593
CRA 1.05.01.94.05Istituto Nazionale di Astrofisicahttp://dx.doi.org/10.13039/501100005184

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