Estimating the p-mode frequencies of the solar twin 18 Scorpii

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Bazot, M (Author) Other; Campante, TL (Author) Other; Chaplin, WJ (Author) Other; Carfantan, H (Author) Other; Bedding, TR (Author) Other; Dumusque, X (Author) Other; Broomhall, AM (Author) Other; Petit, P (Author) Other; Theado, S (Author) Other; Van Grootel, V (Author) Other; Arentoft, T (Author) Other; Castro, M (Author) Other; Christensen Dalsgaard, J (Author) Other; do Nascimento, JD (Author) Other; Dintrans, B (Author) Other; Kjeldsen, H (Author) Other; Monteiro, MJPFG (Author) FCUP; Santos, NC (Author) FCUP; Sousa, S (Author) FCUP; Vauclair, S (Author) Other

Journal

Title: Astronomy and Astrophysics

Vol. 544

Final page: A106

ISSN: 0004-6361

Publisher: EDP Sciences

Indexing

ISI Web of Knowledge - 22 Citations

Scopus - 21 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

CORDIS: Physical sciences > Astronomy

Other information

Authenticus ID: P-002-79E

DOI: 10.1051/0004-6361/201117963

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.

Language: English

Type (Professor's evaluation): Scientific