2008MNRAS.388..838D

Query : 2008MNRAS.388..838D

2008MNRAS.388..838D - Mon. Not. R. Astron. Soc., 388, 838-848 (2008/August-1)

Discovery of a widely separated ultracool dwarf-white dwarf binary.

DAY-JONES A.C., PINFIELD D.J., NAPIWOTZKI R., BURNINGHAM B., JENKINS J.S., JONES H.R.A., FOLKES S.L., WEIGHTS D.J. and CLARKE J.R.A.

Abstract (from CDS):

We present the discovery of the widest known ultracool dwarf-white dwarf binary. This binary is the first spectroscopically confirmed widely separated system from our target sample. We have used the Two-Micron All-Sky Survey (2MASS) and SuperCOSMOS archives in the southern hemisphere, searching for very widely separated ultracool dwarf-white dwarf binaries, and find one common proper motion system, with a separation of 3650-5250au at an estimated distance of 41-59pc, making it the widest known system of this type. Spectroscopy reveals 2MASS J0030-3740 is a DA white dwarf with Teff= 7600±100K, log(g) = 7.79-8.09 and MWD= 0.48-0.65M☉. We spectroscopically type the ultracool dwarf companion (2MASS J0030-3739) as M9±1 and estimate a mass of 0.07-0.08M☉,Teff= 2000-2400K and log(g) = 5.30-5.35, placing it near the mass limit for brown dwarfs. We estimate the age of the system to be >1.94Gyr (from the white dwarf cooling age and the likely length of the main-sequence lifetime of the progenitor) and suggest that this system and other such wide binaries can be used as benchmark ultracool dwarfs.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

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

Nomenclature: Table 2: [DPN2008] UCDc-N (Nos 1 to 8), [DPN2008] WDc-N (Nos 1 to 8).

Simbad objects: 37

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Number of rows : 37
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 2MASS J00300625-3739483 LM* 00 30 06.2472792576 -37 39 48.185519184         18.36 M9 3 0
2 GALEX J003011.7-374048 WD* 00 30 11.7941200488 -37 40 48.139817016         16.19 DA 10 0
3 CFBDS J003402-005206 BD* 00 34 02.7971 -00 52 03.946           T8.5 51 0
4 2MASS J00561471-4036035 LM* 00 56 14.7090800568 -40 36 03.517709688           ~ 3 1
5 2MASS J00571848-4045320 PM* 00 57 18.4747419744 -40 45 32.163150420   15.80   15.07 13.67 ~ 4 1
6 CFBDS J005910-011401 BD* 00 59 10.4899 -01 14 01.313           T9.0 43 0
7 WD 0137-349 WD* 01 39 42.8531929464 -34 42 39.577891392 14.60 15.33 15.30     DA3 101 0
8 NAME WD 0137-349B BD* 01 39 42.9 -34 42 37           L8 38 0
9 GD 1400 WD* 01 47 21.8246176800 -21 56 51.386849088   15.38 15.15 15.42   DA4.1 101 0
10 PB 9441 WD* 03 02 02.9970878064 -09 43 56.342917200   17.63   17.35 17.34 DA 10 0
11 2MASS J03020769-0941571 PM* 03 02 07.6994585496 -09 41 57.017471388         17.66 ~ 1 0
12 V* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   DA 453 0
13 Cl* Melotte 22 TEIDE 1 LM* 03 47 17.9147300712 +24 22 31.746313740         19.26 M8.0 107 0
14 2MASS J05203540-1854278 PM* 05 20 35.4139818432 -18 54 27.696615048         17.64 ~ 1 1
15 2MASS J05204000-1856404 WD* 05 20 40.0241202648 -18 56 40.371559800   18.34   16.40 17.92 DA 11 1
16 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0
17 2MASS J10123558-1051021 PM* 10 12 35.5596208776 -10 51 02.236122216         18.14 ~ 2 0
18 DENIS J101243.7-104334 WD* 10 12 43.6438153946 -10 43 35.135709980   19.48   18.34 17.87 DZ: 7 0
19 SDSS J103533.02+055158.4 CV* 10 35 33.0226966464 +05 51 58.334599512   18.57 18.80     DA 64 0
20 [DPN2008] WDc-6 * 10 40 39.17 -16 50 08.3   20.34   19.54 19.12 ~ 1 1
21 2MASS J10404340-1648204 * 10 40 43.4019938640 -16 48 20.373077592         17.26 ~ 1 1
22 V* V379 Vir CV* 12 12 09.3077194872 +01 36 27.771237504           DAH 78 0
23 PG 1234+482 WD* 12 36 45.1436139768 +47 55 22.218366900     14.38     DA.9 98 2
24 PG 1241-010 WD* 12 44 28.5731497128 -01 18 57.854663568   13.86 14.00 14.3   DA2.1 63 0
25 2MASS J14053753-0551537 * 14 05 37.5339090120 -05 51 53.819594244         17.80 ~ 1 0
26 [DPN2008] WDc-7 WD* 14 05 44.9509818600 -05 49 53.087400156   16.66   16.80 16.87 DB 6 0
27 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 216 0
28 GD 165 WD* 14 24 39.1495824408 +09 17 14.160753960   14.46 14.32 14.6 14.91 DA4.1 176 0
29 LP 271-25 LM* 14 28 43.2275214164 +33 10 39.259309081   21.2   17.8   M9Ve 262 0
30 2MASS J14392836+1929149 BD* 14 39 28.1499428599 +19 29 15.908790370           L1V 145 0
31 VB 8 LM* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 457 0
32 EGGR 151 WD* 21 54 06.4513977984 -01 17 09.525582096   14.728 14.515 14.373 13.990 DA5.5 61 0
33 LP 762-54 WD* 23 21 14.4257442528 -13 27 38.587679028   19.23 19.3 18.42 18.01 DC 16 0
34 [DPN2008] UCDc-8 * 23 21 21.55 -13 26 28.3           ~ 1 0
35 LAWD 94 WD* 23 54 01.0726392457 -33 16 31.078214643   14.6 13.56     DA5.7 63 0
36 L 577-72 PM* 23 54 01.0827378389 -33 16 24.385440650       13.15 10.84 M4V 35 0
37 APMPM J2354-3316C LM* 23 54 09.2806070800 -33 16 26.761079407         16.00 M8.5Ve 25 0

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