Marvels-1b: A short-period, brown dwarf desert candidate from the sdss-iii MARVELS planet search

Brian L. Lee, Jian Ge, Scott W. Fleming, Keivan G. Stassun, B. Scott Gaudi, Rory Barnes, Suvrath Mahadevan, Jason D. Eastman, Jason Wright, Robert J. Siverd, Bruce Gary, Luan Ghezzi, Chris Laws, John P. Wisniewski, G. F.Porto De Mello, Ricardo L.C. Ogando, Marcio A.G. Maia, Luiz Nicolaci Da Costa, Thirupathi Sivarani, Joshua PepperDuy Cuong Nguyen, Leslie Hebb, Nathan De Lee, Ji Wang, Xiaoke Wan, Bo Zhao, Liang Chang, John Groot, Frank Varosi, Fred Hearty, Kevin Hanna, J. C. Van Eyken, Stephen R. Kane, Eric Agol, Dmitry Bizyaev, John J. Bochanski, Howard Brewington, Zhiping Chen, Erin Costello, Liming Dou, Daniel J. Eisenstein, Adam Fletcher, Eric B. Ford, Pengcheng Guo, Jon A. Holtzman, Peng Jiang, R. French Leger, Jian Liu, Daniel C. Long, Elena Malanushenko, Viktor Malanushenko, Mohit Malik, Daniel Oravetz, Kaike Pan, Pais Rohan, Donald P. Schneider, Alaina Shelden, Stephanie A. Snedden, Audrey Simmons, B. A. Weaver, David H. Weinberg, Ji Wei Xie

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Abstract

We present a new short-period brown dwarf (BD) candidate around the star TYC 1240-00945-1. This candidate was discovered in the first year of the Multi-object APO Radial Velocity Exoplanets Large-area Survey (MARVELS), which is part of the Sloan Digital Sky Survey (SDSS) III, and we designate the BD as MARVELS-1b. MARVELS uses the technique of dispersed fixed-delay interferometery to simultaneously obtain radial velocity (RV) measurements for 60 objects per field using a single, custom-built instrument that is fiber fed from the SDSS 2.5 m telescope. From our 20 RV measurements spread over a ∼370 day time baseline, we derive a Keplerian orbital fit with semi-amplitude K = 2.533 ± 0.025 km s-1, period P = 5.8953 ± 0.0004 days, and eccentricity consistent with circular. Independent follow-up RV data confirm the orbit. Adopting a mass of 1.37 ± 0.11 M for the slightly evolved F9 host star, we infer that the companion has a minimum mass of 28.0 ± 1.5 MJup, a semimajor axis 0.071 ± 0.002 AU assuming an edge-on orbit, and is probably tidally synchronized. We find no evidence for coherent intrinsic variability of the host star at the period of the companion at levels greater than a few millimagnitudes. The companion has an a priori transit probability of ∼14%. Although we find no evidence for transits, we cannot definitively rule them out for companion radii ≲1 RJup.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume728
Issue number1
DOIs
StatePublished - Feb 10 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Lee, B. L., Ge, J., Fleming, S. W., Stassun, K. G., Gaudi, B. S., Barnes, R., Mahadevan, S., Eastman, J. D., Wright, J., Siverd, R. J., Gary, B., Ghezzi, L., Laws, C., Wisniewski, J. P., De Mello, G. F. P., Ogando, R. L. C., Maia, M. A. G., Da Costa, L. N., Sivarani, T., ... Xie, J. W. (2011). Marvels-1b: A short-period, brown dwarf desert candidate from the sdss-iii MARVELS planet search. Astrophysical Journal, 728(1). https://doi.org/10.1088/0004-637X/728/1/32