A Method to Identify and Characterize Binary Candidates-A Study of CoRoT(1) Data

Autor(es)

Da Silva, Ronaldo ^[1] ; Silva-Valio, Adriana ^[2]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais, Div Astrofis, BR-12201 Sao Jose Dos Campos - Brazil

^[2] Univ Presbiteriana Mackenzie, Ctr Radio Astron & Astrofis Mackenzie, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Publications of the Astronomical Society of the Pacific; v. 123, n. 903, p. 536-546, MAY 2011.
• Citações Web of Science: 0

Resumo

The analysis of the CoRoT space mission data was performed aiming to test a method that selects, among the several light curves observed, the transiting systems that likely host a low-mass star orbiting the main target. The method identifies stellar companions by fitting a model to the observed transits. Applying this model, which uses equations such as Kepler's third law and an empirical mass-radius relation, it is possible to estimate the mass and radius of the primary and secondary objects, as well as the semimajor axis and inclination angle of the orbit. We focus on how the method can be used in the characterization of transiting systems having a low-mass stellar companion with no need to be monitored with radial-velocity measurements or ground-based photometric observations. The model, which provides a good estimate of the system parameters, is also useful as a complementary approach to select possible planetary candidates. A list of confirmed binaries is presented, together with our estimate of their parameters. The characterization of the first 12 detected CoRoT exoplanetary systems was also performed and agrees very well with the results of their respective announcement articles. The comparison with confirmed systems validates our method, especially when the radius of the secondary companion is smaller than 1: 5 R(Jup), in the case of planets, or larger than 2 R(Jup), in the case of low-mass stars. Intermediate situations are not conclusive. (AU)

• Processo FAPESP: 06/50654-3 - Investigação de fenômenos de altas energias e plasmas astrofísicos: teoria, observação e simulações numéricas
• Beneficiário: Elisabete Maria de Gouveia Dal Pino
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 08/03855-9 - Seleção de candidatos planetários a partir de dados da missão CoRoT
• Beneficiário: Ronaldo Oliveira da Silva
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado