Query : 2016ApJ...819...17O

2016ApJ...819...17O - Astrophys. J., 819, 17 (2016/March-1)

Searching for binary Y dwarfs with the Gemini multi-conjugate adaptive optics system (GeMS).


Abstract (from CDS):

The NASA Wide-field Infrared Survey Explorer (WISE) has discovered almost all the known members of the new class of Y-type brown dwarfs. Most of these Y dwarfs have been identified as isolated objects in the field. It is known that binaries with L- and T-type brown dwarf primaries are less prevalent than either M-dwarf or solar-type primaries, they tend to have smaller separations and are more frequently detected in near-equal mass configurations. The binary statistics for Y-type brown dwarfs, however, are sparse, and so it is unclear if the same trends that hold for L- and T-type brown dwarfs also hold for Y-type ones. In addition, the detection of binary companions to very cool Y dwarfs may well be the best means available for discovering even colder objects. We present results for binary properties of a sample of five WISE Y dwarfs with the Gemini Multi-Conjugate Adaptive Optics System. We find no evidence for binary companions in these data, which suggests these systems are not equal-luminosity (or equal-mass) binaries with separations larger than ∼0.5-1.9 AU. For equal-mass binaries at an age of 5 Gyr, we find that the binary binding energies ruled out by our observations (i.e., 1042 erg) are consistent with those observed in previous studies of hotter ultra-cool dwarfs.

Abstract Copyright:

Journal keyword(s): binaries: general - brown dwarfs - methods: observational - stars: low-mass - techniques: image processing

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 WISE J035934.06-540154.6 BD* 03 59 34.06704 -54 01 54.6420           Y0 26 0
2 WISE J053516.80-750024.9 BD* 05 35 16.80696 -75 00 24.9156           Y1:+ 25 0
3 WISE J071322.55-291751.9 BD* 07 13 22.55616 -29 17 51.9612           Y0 18 0
4 WISEA J085510.74-071442.5 BD* 08 55 10.83168 -07 14 42.5256           Y2 85 0
5 WISE J154151.65-225024.9 BD* 15 41 51.65976 -22 50 24.9936           Y0 49 0
6 WISE J163940.83-684738.6 BD* 16 39 40.83744 -68 47 38.6376           Y0pec 21 0

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