MARVELS-1b: A SHORT-PERIOD, BROWN DWARF DESERT CANDIDATE FROM THE SDSS-III MARVELS PLANET SEARCH

被引：29

作者：

Lee, Brian L. ^{[1
]}

Ge, Jian ^{[1
]}

Fleming, Scott W. ^{[1
]}

Stassun, Keivan G. ^{[2
,3
]}

Gaudi, B. Scott ^{[4
]}

Barnes, Rory ^{[5
]}

Mahadevan, Suvrath ^{[1
,6
,7
]}

Eastman, Jason D. ^{[4
]}

Wright, Jason ^{[6
,7
]}

Siverd, Robert J. ^{[4
]}

Gary, Bruce ^{[2
]}

Ghezzi, Luan ^{[8
]}

Laws, Chris ^{[5
]}

Wisniewski, John P. ^{[5
]}

Porto de Mello, G. F. ^{[9
]}

Ogando, Ricardo L. C. ^{[8
]}

Maia, Marcio A. G. ^{[8
]}

da Costa, Luiz Nicolaci ^{[8
]}

Sivarani, Thirupathi ^{[1
,10
]}

Pepper, Joshua ^{[2
]}

Duy Cuong Nguyen ^{[1
]}

Hebb, Leslie ^{[2
]}

De Lee, Nathan ^{[1
]}

Wang, Ji ^{[1
]}

Wan, Xiaoke ^{[1
]}

Zhao, Bo ^{[1
]}

Chang, Liang ^{[1
]}

Groot, John ^{[1
]}

Varosi, Frank ^{[1
]}

Hearty, Fred ^{[1
]}

Hanna, Kevin ^{[1
]}

van Eyken, J. C. ^{[11
]}

Kane, Stephen R. ^{[11
]}

Agol, Eric ^{[5
]}

Bizyaev, Dmitry ^{[12
]}

Bochanski, John J. ^{[13
]}

Brewington, Howard ^{[12
]}

Chen, Zhiping ^{[1
]}

Costello, Erin ^{[1
]}

Dou, Liming ^{[1
]}

Eisenstein, Daniel J. ^{[14
]}

Fletcher, Adam ^{[1
]}

Ford, Eric B. ^{[1
]}

Guo, Pengcheng ^{[1
]}

Holtzman, Jon A. ^{[15
]}

Jiang, Peng ^{[1
]}

Leger, R. French ^{[5
]}

Liu, Jian ^{[1
]}

Long, Daniel C. ^{[12
]}

Malanushenko, Elena ^{[12
]}

机构：

[1] Univ Florida, Dept Astron, Bryant Space Sci Ctr 211, Gainesville, FL 32611 USA

[2] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[3] Fisk Univ, Dept Phys, Nashville, TN 37208 USA

[4] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[5] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[6] Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA

[7] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[8] Observ Nacl, BR-20921400 Rio De Janeiro, Brazil

[9] Univ Fed Rio de Janeiro, Observ Valongo, BR-20080090 Rio De Janeiro, Brazil

[10] Indian Inst Astrophys, Bangalore 560034, Karnataka, India

[11] CALTECH, NASA, Exoplanet Sci Inst, Pasadena, CA 91125 USA

[12] Apache Point Observ, Sunspot, NM 88349 USA

[13] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[14] Univ Arizona, Steward Observ, Tucson, AZ 85121 USA

[15] New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA

[16] NYU, Ctr Cosmol & Particle Phys, New York, NY USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 728卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

brown dwarfs; stars: low-mass; techniques: radial velocities; HOBBY-EBERLY TELESCOPE; DIGITAL SKY SURVEY; FIXED-DELAY INTERFEROMETRY; EXTRASOLAR GIANT PLANETS; INITIAL MASS FUNCTION; MAIN-SEQUENCE STARS; SOLAR-TYPE STARS; F-TYPE STARS; SUBSTELLAR COMPANIONS; STELLAR COMPANIONS;

D O I：

10.1088/0004-637X/728/1/32

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 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-circle dot 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 similar to 14%. Although we find no evidence for transits, we cannot definitively rule them out for companion radii less than or similar to 1 R-Jup.

引用

页数：16

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