2013ApJ...778...38H

Query : 2013ApJ...778...38H

2013ApJ...778...38H - Astrophys. J., 778, 38 (2013/November-3)

Microlensing discovery of a tight, low-mass-ratio planetary-mass object around an old field brown dwarf.

HAN C., JUNG Y.K., UDALSKI A., SUMI T., GAUDI B.S., GOULD A., BENNETT D.P., TSAPRAS Y., SZYMANSKI M.K., KUBIAK M., PIETRZYNSKI G., SOSZYNSKI I., SKOWRON J., KOZLOWSKI S., POLESKI R., ULACZYK K., WYRZYKOWSKI L., PIETRUKOWICZ P. (The OGLE Collaboration), ABE F., BOND I.A., BOTZLER C.S., CHOTE P., FREEMAN M., FUKUI A., FURUSAWA K., HARRIS P., ITOW Y., LING C.H., MASUDA K., MATSUBARA Y., MURAKI Y., OHNISHI K., RATTENBURY N.J., SAITO TO., SULLIVAN D.J., SWEATMAN W.L., SUZUKI D., TRISTRAM P.J., WADA K., YOCK P.C.M. (The MOA Collaboration), BATISTA V., CHRISTIE G., CHOI J.-Y., DEPOY D.L., DONG S., HWANG K.-H., KAVKA A., LEE C.-U., MONARD L.A.G., NATUSCH T., NGAN H., PARK H., POGGE R.W., PORRITT I., SHIN I.-G., TAN T.G., YEE J.C. (The {mu}FUN Collaboration), ALSUBAI K.A., BOZZA V., BRAMICH D.M., BROWNE P., DOMINIK M., HORNE K., HUNDERTMARK M., IPATOV S., KAINS N., LIEBIG C., SNODGRASS C., STEELE I.A., STREET R.A. (The RoboNet Collaboration)

Abstract (from CDS):

Observations of accretion disks around young brown dwarfs (BDs) have led to the speculation that they may form planetary systems similar to normal stars. While there have been several detections of planetary-mass objects around BDs (2MASS 1207-3932 and 2MASS 0441-2301), these companions have relatively large mass ratios and projected separations, suggesting that they formed in a manner analogous to stellar binaries. We present the discovery of a planetary-mass object orbiting a field BD via gravitational microlensing, OGLE-2012-BLG-0358Lb. The system is a low secondary/primary mass ratio (0.080 ±0.001), relatively tightly separated (∼0.87 AU) binary composed of a planetary-mass object with 1.9±0.2 Jupiter masses orbiting a BD with a mass 0.022 M_☉. The relatively small mass ratio and separation suggest that the companion may have formed in a protoplanetary disk around the BD host in a manner analogous to planets.

Abstract Copyright: ∼

Journal keyword(s): brown dwarfs - gravitational lensing: micro - planetary systems

Simbad objects: 7

Full paper

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Number of rows : 7

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	LEDA 142620	G	04 41 27.1371277176	-23 01 53.336260452	16.89		15.45		~	6	0
2	TWA 27	LM*	12 07 33.4675524840	-39 32 54.016625184		19.95	17.99	15.88	M8IVe	376	0
3	OGLE-2012-BLG-0358	BD?	17 42 46.7641762656	-24 15 39.605456196					~	16	1
4	NAME EWS 2012-BLG-0358b	Pl	17 42 46.7641762656	-24 15 39.605456196					~	10	1
5	NAME Galactic Center	reg	17 45 39.60213	-29 00 22.0000					~	16269	0
6	NAME Galactic Bulge	reg	~	~					~	4794	0
7	NAME Galactic Bar	reg	~	~					~	1458	0

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