TY - JOUR
T1 - Very low mass stellar and substellar companions to solar-like stars from marvels. II. A short-period companion orbiting an f star with evidence of a stellar tertiary and significant mutual inclination
AU - Fleming, Scott W.
AU - Ge, Jian
AU - Barnes, Rory
AU - Beatty, Thomas G.
AU - Crepp, Justin R.
AU - De Lee, Nathan
AU - Esposito, Massimiliano
AU - Femenia, Bruno
AU - Ferreira, Leticia
AU - Gary, Bruce
AU - Gaudi, B. Scott
AU - Ghezzi, Luan
AU - González Hernández, Jonay I.
AU - Hebb, Leslie
AU - Jiang, Peng
AU - Lee, Brian
AU - Nelson, Ben
AU - Porto De Mello, Gustavo F.
AU - Shappee, Benjamin J.
AU - Stassun, Keivan
AU - Thompson, Todd A.
AU - Tofflemire, Benjamin M.
AU - Wisniewski, John P.
AU - Wood-Vasey, W. Michael
AU - Agol, Eric
AU - Allende Prieto, Carlos
AU - Bizyaev, Dmitry
AU - Brewington, Howard
AU - Cargile, Phillip A.
AU - Coban, Louis
AU - Costello, Korena S.
AU - Da Costa, Luis N.
AU - Good, Melanie L.
AU - Hua, Nelson
AU - Kane, Stephen R.
AU - Lander, Gary R.
AU - Liu, Jian
AU - Ma, Bo
AU - Mahadevan, Suvrath
AU - Maia, Marcio A.G.
AU - Malanushenko, Elena
AU - Malanushenko, Viktor
AU - Muna, Demitri
AU - Nguyen, Duy Cuong
AU - Oravetz, Daniel
AU - Paegert, Martin
AU - Pan, Kaike
AU - Pepper, Joshua
AU - Rebolo, Rafael
AU - Roebuck, Eric J.
AU - Santiago, Basilio X.
AU - Schneider, Donald P.
AU - Shelden, Alaina
AU - Simmons, Audrey
AU - Sivarani, Thirupathi
AU - Snedden, Stephanie
AU - Vincent, Chelsea L.M.
AU - Wan, Xiaoke
AU - Wang, Ji
AU - Weaver, Benjamin A.
AU - Weaver, Gwendolyn M.
AU - Zhao, Bo
PY - 2012/9
Y1 - 2012/9
N2 - We report the discovery via radial velocity (RV) measurements of a short-period (P = 2.430420 ± 0.000006days) 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 > 2000days. High-resolution spectroscopy of the host star yields T eff = 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 M 1 = 1.21 ± 0.08 M and R 1 = 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 vsin 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 0.5-0.6 M, 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.
AB - We report the discovery via radial velocity (RV) measurements of a short-period (P = 2.430420 ± 0.000006days) 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 > 2000days. High-resolution spectroscopy of the host star yields T eff = 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 M 1 = 1.21 ± 0.08 M and R 1 = 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 vsin 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 0.5-0.6 M, 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.
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U2 - 10.1088/0004-6256/144/3/72
DO - 10.1088/0004-6256/144/3/72
M3 - Article
AN - SCOPUS:84864756127
SN - 0004-6256
VL - 144
JO - Astronomical Journal
JF - Astronomical Journal
IS - 3
M1 - 72
ER -