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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

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

Revista

Título: Astronomy and Astrophysics

Vol. 544

Página Final: A106

ISSN: 0004-6361

Editora: EDP Sciences

Indexação

ISI Web of Knowledge - 22 Citações

Scopus - 21 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

CORDIS: Ciências Físicas > Astronomia

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica