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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 Pepper
; Duy 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
; | | Date: |
23 Nov 2010 | | Abstract: | We present a new short-period brown dwarf 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 third phase of the Sloan Digital Sky Survey (SDSS-III), and we
designate the brown dwarf as MARVELS-1b. MARVELS uses the technique of
dispersed fixed-delay interferometery to simultaneously obtain radial velocity
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 radial velocity
measurements spread over a ~370 d time baseline, we derive a Keplerian orbital
fit with semi-amplitude K=2.533+/-0.025 km/s, period P=5.8953+/-0.0004 d, and
eccentricity consistent with circular. Independent follow-up radial velocity
data confirm the orbit. Adopting a mass of 1.37+/-0.11 M_Sun for the slightly
evolved F9 host star, we infer that the companion has a minimum mass of
28.0+/-1.5 M_Jup, a semimajor axis 0.071+/-0.002 AU assuming an edge-on orbit,
and is probably tidally synchronized. We find no evidence for coherent
instrinsic 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 R_Jup. | | Source: | arXiv, 1011.5170 | | Services: | Forum | Review | PDF | Favorites | |
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