TESS Asteroseismology of the Known Red-giant Host Stars HD 212771 and HD 203949

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Campante, TL (Autor) FCUP; Corsaro, E (Autor) Outra; Lund, MN (Autor) Outra; Mosser, B (Autor) Outra; Serenelli, A (Autor) Outra; Veras, D (Autor) Outra; Adibekyan, V (Autor) Outra; Antia, HM (Autor) Outra; Ball, W (Autor) Outra; Basu, S (Autor) Outra; Bedding, TR (Autor) Outra; Bossini, D (Autor) Outra; Davies, GR (Autor) Outra; Mena, ED (Autor) FCUP; Garcia, RA (Autor) Outra; Handberg, R (Autor) Outra; Hon, M (Autor) Outra; Kane, SR (Autor) Outra; Kawaler, SD (Autor) Outra; Kuszlewicz, JS (Autor) Outra; Lucas, M (Autor) Outra; Mathur, S (Autor) Outra; Nardetto, N (Autor) Outra; Nielsen, MB (Autor) Outra; Pinsonneault, MH (Autor) Outra; Reffert, S (Autor) Outra; Aguirre, VS (Autor) Outra; Stassun, KG (Autor) Outra; Stello, D (Autor) Outra; Stock, S (Autor) Outra; Vrard, M (Autor) Outra; Yildiz, M (Autor) Outra; Chaplin, WJ (Autor) Outra; Huber, D (Autor) Outra; Bean, JL (Autor) Outra; Orhan, ZC (Autor) Outra; Cunha, MS (Autor) FCUP; Christensen Dalsgaard, J (Autor) Outra; Kjeldsen, H (Autor) Outra; Metcalfe, TS (Autor) Outra; Miglio, A (Autor) Outra; Monteiro, MJPFG (Autor) FCUP; Nsamba, B (Autor) Outra; Ortel, S (Autor) Outra; Pereira, F (Autor) Outra; Sousa, SG (Autor) FCUP; Tsantaki, M (Autor) Outra; Turnbull, MC (Autor) Outra

Revista

Título: Astrophysical Journal

Vol. 885

Página Final: 31

ISSN: 0004-637X

Editora: American Astronomical Society

Indexação

ISI Web of Knowledge - 23 Citações

Scopus - 27 Citações

Outras Informações

ID Authenticus: P-00R-DC5

DOI: 10.3847/1538-4357/ab44a8

Abstract (EN): The Transiting Exoplanet Survey Satellite (TESS) is performing a near all-sky survey for planets that transit bright stars. In addition, its excellent photometric precision enables asteroseismology of solar-type and red-giant stars, which exhibit convection-driven, solar-like oscillations. Simulations predict that TESS will detect solar-like oscillations in nearly 100 stars already known to host planets. In this paper, we present an asteroseismic analysis of the known red-giant host stars HD;212771 and HD;203949, both systems having a long-period planet detected through radial velocities. These are the first detections of oscillations in previously known exoplanet-host stars by TESS, further showcasing the mission?s potential to conduct asteroseismology of red-giant stars. We estimate the fundamental properties of both stars through a grid-based modeling approach that uses global asteroseismic parameters as input. We discuss the evolutionary state of HD;203949 in depth and note the large discrepancy between its asteroseismic mass (M-* = 1.23 0.15 MM* = 1.00 0.16 M if in the clump) and the mass quoted in the discovery paper (M-* = 2.1 0.1 M), implying a change >30% in the planet?s mass. Assuming HD;203949 to be in the clump, we investigate the planet?s past orbital evolution and discuss how it could have avoided engulfment at the tip of the red-giant branch. Finally, HD;212771 was observed by K2 during its Campaign 3, thus allowing for a preliminary comparison of the asteroseismic performances of TESS and K2. We estimate the ratio of the observed oscillation amplitudes for this star to be <i, consistent with the expected ratio of ?0.85 due to the redder bandpass of TESS.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12