|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology | | V. Silva Aguirre
; G.R. Davies
; S. Basu
; J. Christensen-Dalsgaard
; O. Creevey
; T.S. Metcalfe
; T.R. Bedding
; L. Casagrande
; R. Handberg
; M.N. Lund
; P.E. Nissen
; W.J. Chaplin
; D. Huber
; A.M. Serenelli
; D. Stello
; V. Van Eylen
; T.L. Campante
; Y. Elsworth
; R.L. Gilliland
; S. Hekker
; C. Karoff
; S.D. Kawaler
; H. Kjeldsen
; M.S. Lundkvist
; | | Date: |
29 Apr 2015 | | Abstract: | We present a study of 33 planet-candidate host stars for which asteroseismic
observations have sufficiently high signal-to-noise ratio to allow extraction
of individual pulsation frequencies. We implement a new Bayesian scheme that is
flexible in its input to process individual oscillation frequencies,
combinations of them, and average asteroseismic parameters, and derive robust
fundamental properties for these targets. Applying this scheme to grids of
evolutionary models yields stellar properties with median statistical
uncertainties of 1.1% (radius), 1.7% (density), 3.3% (mass), 4.4% (distance),
and 14% (age), making this the exoplanet host-star sample with the most precise
and uniformly determined fundamental parameters to date. We assess the
systematics from changes in the solar abundances and mixing-length parameter,
showing that they are smaller than the statistical errors. We also determine
the stellar properties with three other fitting algorithms and explore the
systematics arising from using different evolution and pulsation codes,
resulting in 1% in density and radius, and 2% and 7% in mass and age,
respectively. We identify the initial helium abundance as a source of
systematics comparable to our statistical uncertainties, and discuss future
prospects for constraining this parameter by combining asteroseismology and
data from space missions. Finally we compare our derived properties with those
obtained using the global average asteroseismic observables along with
effective temperature and metallicity, finding an excellent level of agreement.
Owing to selection effects, our results show that the majority of the high
signal-to-noise ratio asteroseismic Kepler host stars are older than the Sun. | | Source: | arXiv, 1504.7992 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER