2020MNRAS.499.5302D

Query : 2020MNRAS.499.5302D

2020MNRAS.499.5302D - Mon. Not. R. Astron. Soc., 499, 5302-5317 (2020/December-3)

Increasing the census of ultracool dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data.

DAL PONTE M., SANTIAGO B., CARNERO ROSELL A., BURNINGHAM B., YANNY B., MARSHALL J.L., BECHTOL K., MARTINI P., LI T.S., DE PARIS L., ABBOTT T.M.C., AGUENA M., ALLAM S., AVILA S., BERTIN E., BHARGAVA S., BROOKS D., BUCKLEY-GEER E., CARRASCO KIND M., CARRETERO J., DA COSTA L.N., DE VICENTE J., DIEHL H.T., DOEL P., EIFLER T.F., EVERETT S., FLAUGHER B., FOSALBA P., FRIEMAN J., GARCIA-BELLIDO J., GAZTANAGA E., GERDES D.W., GRUEN D., GRUENDL R.A., GSCHWEND J., GUTIERREZ G., HINTON S.R., HOLLOWOOD D.L., HONSCHEID K., JAMES D.J., KUEHN K., KUROPATKIN N., MAIA M.A.G., MARCH M., MENANTEAU F., MIQUEL R., PALMESE A., PAZ-CHINCHON F., PLAZAS A.A., SANCHEZ E., SCARPINE V., SERRANO S., SEVILLA-NOARBE I., SMITH M., SUCHYTA E., SWANSON M.E.C., TARLE G., THOMAS D., VARGA T.N., WALKER A.R. (The DES Collaboration)

Abstract (from CDS):

We present the discovery of 255 binary and 6 multiple system candidates with wide (> 5 arcsec) separation composed by ultracool dwarfs (UCDs) companions to stars, plus nine double ultracool dwarf systems. These systems were selected based on common distance criteria. About 90 per cent of the total sample has proper motions available and 73 per cent of the systems also satisfy a common proper motion criterion. The sample of ultracool candidates was taken from the Dark Energy Survey (DES) and the candidate stellar primaries are from Gaia DR2 and DES data. We compute chance alignment probabilities in order to assess the physical nature of each pair. We find that 174 candidate pairs with Gaia DR2 primaries and 81 pairs with a DES star as a primary have chance alignment probabilities < 5 per cent. Only nine candidate systems composed of two UCDs were identified. The sample of candidate multiple systems is made up of five triple systems and one quadruple system. The majority of the UCDs found in binaries and multiples are of early L type and the typical wide binary fraction over the L spectral types is 2-4 per cent. Our sample of candidate wide binaries with UCDs as secondaries constitutes a substantial increase over the known number of such systems, which are very useful to constrain the formation and evolution of UCDs.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): binaries: general - brown dwarfs - stars: low-mass

VizieR on-line data: <Available at CDS (J/MNRAS/499/5302): table1.dat table2.dat table3.dat tablea1.dat tablea2.dat refs.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASSI J0028394+150141 BD* 00 28 39.43224 +15 01 41.8620           L4.5V 24 0
2 2MASS J01415823-4633574 BD* 01 41 58.2329929560 -46 33 57.347594316           L0gamma 80 0
3 2MASS J02235464-5815067 BD* 02 23 54.6539799384 -58 15 06.632229960           L0gamma 20 0
4 2MASS J08430796+3141297 BD* 08 43 07.9444082232 +31 41 29.543510508           L2.5V 10 0
5 2MASS J09175035+2944455 BD* 09 17 50.3518276560 +29 44 45.273937776           L0 10 0
6 2MASS J09593276+4523309 BD* 09 59 32.76648 +45 23 30.9732           L3-4 12 0
7 2MASS J10433508+1213149 BD* 10 43 35.08368 +12 13 14.9700           L9 40 0
8 2MASS J13482456-4227441 BD* 13 48 24.5658066936 -42 27 44.108007840           L2 8 0
9 LSPM J1449+0533 PM* 14 49 36.4690419288 +05 33 37.764902376   20.8   18.6   ~ 3 0
10 BD-01 3055 PM* 15 25 55.7766974770 -02 04 18.105091553   11.230 10.426 10.385   K0 28 0
11 HD 149361B BD* 16 32 56.1155452896 +35 05 07.478306628           L0.7V 10 0
12 2MASS J17073334+4301304 BD* 17 07 33.3378590424 +43 01 30.259773084           L0.5 26 0
13 2MASS J21265040-8140293 BD* 21 26 50.3636724576 -81 40 29.223318396         18.38 L3gamma 22 0
14 2MASS J23225299-6151275 BD* 23 22 53.0081802408 -61 51 27.526074804           L2gamma 30 0
15 2MASS J23512200+3010540 BD* 23 51 22.00512 +30 10 54.0012           L6.5 24 0

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