Discovery of a low-mass companion to a metal-rich F star with the MARVELS pilot project

Scott W. Fleming, Jian Ge, Suvrath Mahadevan, Brian Lee, Jason D. Eastman, Robert J. Siverd, B. Scott Gaudi, Andrzej Niedzielski, Thirupathi Sivarani, Keivan G. Stassun, Alex Wolszczan, Rory Barnes, Bruce Gary, Duy Cuong Nguyen, Robert C. Morehead, Xiaoke Wan, Bo Zhao, Jian Liu, Pengcheng Guo, Stephen R. KaneJulian C. Van Eyken, Nathan M. De Lee, Justin R. Crepp, Alaina C. Shelden, Chris Laws, John P. Wisniewski, Donald P. Schneider, Joshua Pepper, Stephanie A. Snedden, Kaike Pan, Dmitry Bizyaev, Howard Brewington, Olena Malanushenko, Viktor Malanushenko, Daniel Oravetz, Audrey Simmons, Shannon Watters

Research output: Contribution to journalArticle

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Abstract

We report the discovery of a low-mass companion orbiting the metal-rich, main sequence F star TYC 2949-00557-1 during the Multi-object APO Radial Velocity Exoplanet Large-area Survey (MARVELS) pilot project. The host star has an effective temperature Teff = 6135±40 K, logg = 4.4±0.1, and [Fe/H] = 0.32±0.01, indicating a mass of M = 1.25 ± 0.09M and R = 1.15 ± 0.15R. The companion has an orbital period of 5.69449 ± 0.00023 days and straddles the hydrogen burning limit with a minimum mass of 64 MJ, and thus may be an example of the rare class of brown dwarfs orbiting at distances comparable to those of "Hot Jupiters." We present relative photometry that demonstrates that the host star is photometrically stable at the few millimagnitude level on time scales of hours to years, and rules out transits for a companion of radius ≳ 0.8RJ at the 95% confidence level. Tidal analysis of the system suggests that the star and companion are likely in a double synchronous state where both rotational and orbital synchronization have been achieved. This is the first low-mass companion detected with a multi-object, dispersed, fixed-delay interferometer.

Original languageEnglish (US)
Pages (from-to)1186-1199
Number of pages14
JournalAstrophysical Journal
Volume718
Issue number2
DOIs
StatePublished - Aug 1 2010

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Fleming, S. W., Ge, J., Mahadevan, S., Lee, B., Eastman, J. D., Siverd, R. J., Gaudi, B. S., Niedzielski, A., Sivarani, T., Stassun, K. G., Wolszczan, A., Barnes, R., Gary, B., Nguyen, D. C., Morehead, R. C., Wan, X., Zhao, B., Liu, J., Guo, P., ... Watters, S. (2010). Discovery of a low-mass companion to a metal-rich F star with the MARVELS pilot project. Astrophysical Journal, 718(2), 1186-1199. https://doi.org/10.1088/0004-637X/718/2/1186