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Title: MARVELS-1b: A Short-period, Brown Dwarf Desert Candidate from the SDSS-III Marvels Planet Search
Authors: 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
Porto de Mello, G. F
Ogando, R. L. C
Maia, M. A. G
Nicolaci da Costa, L
Sivarani, T
Pepper, J
Cuong Nguyen, D
Hebb, L
De Lee, N
Wang, J
Wan, X
Chang, L
Groot, J
Varosi, F
Hearty, F
Hanna, K
van Eyken, J. C
Kane, S. R
Agol, E
Bizyaev, D
Bochanski, J. J
Brewington, H
Chen, Z
Costello, E
Dou, L
Eisenstein, D. J
Fletcher, A
Ford, E. B
Guo, P
Holtzman, J. A
Jiang, P
French Leger, R
Liu, J
Long, D. C
Malanushenko, E
Malanushenko, V
Malik, M
Oravetz, D
Pan, K
Rohan, P
Schneider, D. P
Shelden, A
Snedden, S. A
Simmons, A
Weaver, B. A
Weinberg, D. H
Xie, J
Keywords: Brown dwarfs – stars;Low-mass – techniques;Radial velocities
Issue Date: Feb-2011
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 728. No. 1, 32
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 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 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 lsim1 R Jup.
Description: Open Access
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Appears in Collections:IIAP Publications

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