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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The Solar Twin Planet Search II. A Jupiter twin around a solar twin

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Autor(es):
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Bedell, M. [1, 2] ; Melendez, J. [1] ; Bean, J. L. [2] ; Ramirez, I. [3, 4] ; Asplund, M. [5] ; Alves-Brito, A. [6] ; Casagrande, L. [5] ; Dreizler, S. [7] ; Monroe, T. [1] ; Spina, L. [1] ; Tucci Maia, M. [1]
Número total de Autores: 11
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Astron IAG USP, BR-05508900 Sao Paulo, SP - Brazil
[2] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 - USA
[3] Univ Texas Austin, Dept Astron, Austin, TX 78712 - USA
[4] Univ Texas Austin, McDonald Observ, Austin, TX 78712 - USA
[5] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611 - Australia
[6] Univ Fed Rio Grande do Sul, Inst Fis, Porto Alegre, RS - Brazil
[7] Univ Gottingen, Inst Astrophys, Gottingen - Germany
Número total de Afiliações: 7
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 581, SEP 2015.
Citações Web of Science: 17
Resumo

Context. With high-precision radial velocity surveys reaching a sufficiently long time baseline, the domain of long-period planet detections has recently opened up. The search for Jupiter-like planets is especially important if we wish to investigate the prevalence of solar system analogs, but their detection is complicated by the existence of stellar activity cycles on similar timescales. Radial velocity data with sufficiently long-term instrumental precision and robust methods of diagnosing activity are crucial to the detection of extrasolar Jupiters. Aims. Through our HARPS survey for planets around solar twin stars, we have identified a promising Jupiter twin candidate around the star HIP11915. We characterize this Keplerian signal and investigate its potential origins in stellar activity. Methods. We carry out a Markov chain Monte Carlo (MCMC) analysis of the radial velocity data. To examine the signal's origin, we employ a variety of statistical tests using activity diagnostics such as the Ca II H and K lines and line asymmetry tracers. Results. Our analysis indicates that HIP11915 hosts a Jupiter-mass planet with a 3800-day orbital period and low eccentricity. Although we cannot definitively rule out an activity cycle interpretation, we find that a planet interpretation is more likely based on a joint analysis of radial velocity and activity index data. Conclusions. The challenges of long-period radial velocity signals addressed in this paper are critical for the ongoing discovery of Jupiter-like exoplanets. If planetary in nature, the signal investigated here represents a very close analog to the solar system in terms of both Sun-like host star and Jupiter-like planet. (AU)

Processo FAPESP: 12/24392-2 - Espectroscopia de alta precisão: impacto no estudo de planetas, estrelas, a galáxia e cosmologia
Beneficiário:Jorge Luis Melendez Moreno
Linha de fomento: Auxílio à Pesquisa - Temático