Article (Scientific journals)
Estimating the p-mode frequencies of the solar twin 18 Scorpii
Bazot, M.; Campante, T.L.; Chaplin, W.J. et al.
2012In Astronomy and Astrophysics, 544, p. 106
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Keywords :
stars: individual: 18 Sco; stars: oscillations; techniques: radial velocities; methods: data analysis
Abstract :
[en] Solar twins have been a focus of attention for more than a decade, because their structure is extremely close to that of the Sun. Today, thanks to high-precision spectrometers, it is possible to use asteroseismology to probe their interiors. Our goal is to use time series obtained from the HARPS spectrometer to extract the oscillation frequencies of 18 Sco, the brightest solar twin. We used the tools of spectral analysis to estimate these quantities. We estimate 52 frequencies using an MCMC algorithm. After examination of their probability densities and comparison with results from direct MAP optimization, we obtain a minimal set of 21 reliable modes. The identification of each pulsation mode is straightforwardly accomplished by comparing to the well-established solar pulsation modes. We also derived some basic seismic indicators using these values. These results offer a good basis to start a detailed seismic analysis of 18 Sco using stellar models.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bazot, M.
Campante, T.L.
Chaplin, W.J.
Carfantan, H.
Bedding, T.R.
Dumusque, X.
Broomhall, A.M.
Petit, P.
Théado, S.
Van Grootel, Valérie  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Arentoft, T.
Castro, M.
Christensen-Dalsgaard, J.
do Nascimento, J.-D.
Dintrans, B.
Kjeldsen, H.
Monteiro, M.J.P.F.G.
Santos, N.C.
Sousa, S.O.
Vauclair, S.
More authors (10 more) Less
Language :
English
Title :
Estimating the p-mode frequencies of the solar twin 18 Scorpii
Publication date :
August 2012
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
544
Pages :
106
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 October 2012

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