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Very low mass stellar and substellar companions to solar-like stars from MARVELS. II. A short-period companios orbiting an F star with evidence of a stellar tertiary and significant mutual inclination

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Very low mass stellar and substellar companions to solar-like stars from MARVELS. II. A short-period companios orbiting an F star with evidence of a stellar tertiary and significant mutual inclination

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Título Very low mass stellar and substellar companions to solar-like stars from MARVELS. II. A short-period companios orbiting an F star with evidence of a stellar tertiary and significant mutual inclination
Autor Fleming, S.W.
Jian Ge
Barnes, Rory
Beatty, Thomas G.
Crepp, Justin R.
De Lee, Nathan M.
Esposito, Massimiliano
Femenía Castellá, B.
Ferreira, Letícia D.
Gary, Bruce L.
Gaudi, B. S.
Ghezzi, Luan
González Hernández, Jonay I.
Hebb, Leslie
Jiang, Peng
Lee, Brian L.
Nelson, Ben
Mello, Gustavo Frederico Porto de
Shappee, Benjamin J.
Stassun, Keivan G.
Thompson, Todd
Tofflemire, Benjamin M.
Wisniewski, J.P.
Wood-Vasey, W.M.
Agol, Eric
Allende Prieto, Carlos
Bizyaev, D.
Brewington, Howard J.
Cargile, Phillip A.
Coban, Louis
Costello, Korena S.
Costa, Luiz N. da
Good, Melanie L.
Hua, Nelson
Kane, Stephen R.
Lander, Gary R.
Liu, Jian
Ma, Bo
Mahadevan, Suvrath
Maia, Marcio Antonio Geimba
Malanushenko, E.
Malanushenko, V.
Muna, Demitri
Nguyen, D.C.
Oravetz, Daniel J.
Paegert, Martin
Pan, K.
Pepper, J.
Rebolo, Rafael
Roebuck, Eric J.
Santiago, Basilio Xavier
Schneider, D.P.
Bradley, Alaina C. Shelden
Simmons, Audrey E.
Sivarani, Thirupathi
Snedden, S.A.
Vincent, Chelsea L. M.
Wan, Xiaoke
Wang, Ji
Weaver, Benjamin A.
Weaver, Gwendolyn M.
Zhao, Bo
Abstract We report the discovery via radial velocity (RV) measurements of a short-period (P = 2.430420±0.000006 days) companion to the F-type main-sequence star TYC 2930-00872-1. A long-term trend in the RV data also suggests the presence of a tertiary stellar companion with P > 2000 days. High-resolution spectroscopy of the host star yields Teff = 6427 ± 33 K, log g = 4.52 ± 0.14, and [Fe/H] = −0.04 ± 0.05. These parameters, combined with the broadband spectral energy distribution (SED) and a parallax, allow us to infer a mass and radius of the host star of M1 = 1.21 ± 0.08 M and R1 = 1.09+0.15 −0.13 R . The minimum mass of the inner companion is below the hydrogen-burning limit; however, the true mass is likely to be substantially higher. We are able to exclude transits of the inner companion with high confidence. Further, the host star spectrum exhibits a clear signature of Ca H and K core emission, indicating stellar activity, but a lack of photometric variability and small v sin I suggest that the primary’s spin axis is oriented in a pole-on configuration. The rotational period of the primary estimated through an activity–rotation relation matches the orbital period of the inner companion to within 1.5 σ, suggesting that the primary and inner companion are tidally locked. If the inner companion’s orbital angular momentum vector is aligned with the stellar spin axis as expected through tidal evolution, then it has a stellar mass of ∼0.3–0.4 M . Direct imaging limits the existence of stellar companions to projected separations <30 AU. No set of spectral lines and no significant flux contribution to the SED from either companion are detected, which places individual upper mass limits of M{2,3} 1.0 M , provided they are not stellar remnants. If the tertiary is not a stellar remnant, then it likely has a mass of ∼0.5–0.6M , and its orbit is likely significantly inclined from that of the secondary, suggesting that the Kozai–Lidov mechanism may have driven the dynamical evolution of this system.
Contido em The Astronomical journal. Vol. 144, no. 3 (Sep. 2012), 72, 19 p.
Assunto Astrometria
Cálcio
Dimensões estelares
Espectros estelares
Evolucao estelar
Hidrogenio
Massa estelar
Momento angular
Movimento estelar
Potassio
[en] Binaries: close
[en] Binaries: spectroscopic
[en] Stars: individual (TYC 2930-00872-1)
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108138
Arquivos Descrição Formato
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