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Title: DISCOVERY OF A LOW-MASS COMPANION TO A METAL-RICH F STAR WITH THE MARVELS PILOT PROJECT

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 T{sub eff} = 6135 {+-} 40 K, logg = 4.4 {+-} 0.1, and [Fe/H] = 0.32 {+-} 0.01, indicating a mass of M = 1.25 {+-} 0.09 M{sub sun} and R = 1.15 {+-} 0.15 R{sub sun}. The companion has an orbital period of 5.69449 {+-} 0.00023 days and straddles the hydrogen burning limit with a minimum mass of 64 M{sub J} , 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 {approx}>0.8 R{sub J} 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,more » dispersed, fixed-delay interferometer.« less
Authors:
; ; ; ; ; ; ; ; ; ;  [1] ; ; ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [6] ;  [7]
  1. Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 326711-2055 (United States)
  2. Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States)
  3. Torun Center for Astronomy, Nicolaus Copernicus University, ul. Gagarina 11, 87-100, Torun (Poland)
  4. Indian Institute of Astrophysics, Bangalore 560034 (India)
  5. Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States)
  6. Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802 (United States)
  7. Department of Astronomy, University of Washington, P.O. Box 351580, Seattle, WA 98195 (United States)
Publication Date:
OSTI Identifier:
21455073
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 718; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/718/2/1186
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; HYDROGEN BURNING; INTERFEROMETERS; JUPITER PLANET; MASS; METALS; PHOTOMETRY; RADIAL VELOCITY; STARS; SYNCHRONIZATION ELEMENTS; MEASURING INSTRUMENTS; PLANETS; STAR BURNING; VELOCITY