2010MNRAS.404.1952B


Query : 2010MNRAS.404.1952B

2010MNRAS.404.1952B - Mon. Not. R. Astron. Soc., 404, 1952-1961 (2010/June-1)

The discovery of a very cool binary system.

BURNINGHAM B., LEGGETT S.K., LUCAS P.W., PINFIELD D.J., SMART R.L., DAY-JONES A.C., JONES H.R.A., MURRAY D., NICKSON E., TAMURA M., ZHANG Z., LODIEU N., TINNEY C.G. and ZAPATERO OSORIO M.R.

Abstract (from CDS):

We report the discovery of a very cool d/sdL7+T7.5p common proper motion binary system, SDSS J1416+13AB, found by cross-matching the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) Large Area Survey Data Release 5 (UKIDSS LAS DR4) against the Sloan Digital Sky Survey Data Release 7. The d/sdL7 is blue in J - H and H - K and has other features suggestive of low metallicity and/or high gravity. The T7.5p displays spectral peculiarity seen before in earlier type dwarfs discovered in UKIDSS LAS DR4, and referred to as CH4-J-early peculiarity, where the CH4-J index, based on the absorption to the red side of the J-band peak, suggests an earlier spectral type than the H2O-J index, based on the blue side of the J-band peak, by ∼2 subtypes. We suggest that CH4-J-early peculiarity arises from low metallicity and/or high gravity, and speculate as to its use for classifying T dwarfs. UKIDSS and follow-up United Kingdom Infrared Telescope/Wide Field CAMera (UKIRT/WFCAM) photometry shows the T dwarf to have the bluest near-infrared colours yet seen for such an object with H - K = -1.31±0.17. Warm Spitzer IRAC photometry shows the T dwarf to have extremely red H - [4.5] = 4.86±0.04, which is the reddest yet seen for a substellar object. The lack of parallax measurement for the pair limits our ability to estimate parameters for the system. However, applying a conservative distance estimate of 5-15 pc suggests a projected separation in range 45-135 au. By comparing H - K:H - [4.5] colours of the T dwarf to spectral models, we estimate that Teff= 500 K and [M/H] ∼ - 0.30, with logg ∼ 5.0. This suggests a mass of ∼30 MJupiter for the T dwarf and an age of ∼10 Gyr for the system. The primary would then be a 75 MJupiter object with logg ∼ 5.5 and a relatively dust-free Teff∼ 1500K atmosphere. Given the unusual properties of the system we caution that these estimates are uncertain. We eagerly await parallax measurements and high-resolution imaging which will constrain the parameters further.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): surveys - stars: low-mass, brown dwarfs

Nomenclature: Text: [BLL2010] SDSS J1416+13AB N=1, [BLL2010] SDSS J1416+13A (Nos A-B).

Simbad objects: 18

goto Full paper

goto View the references in ADS

Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASSI J0103320+193536 BD* 01 03 32.03712 +19 35 36.1824           L6V 68 0
2 DENIS J020529.0-115925 BD* 02 05 29.40072 -11 59 29.6736           L7V 142 0
3 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 151 0
4 2MASS J05325346+8246465 BD* 05 32 54.4385958315 +82 46 45.174215154           esdL7 55 0
5 2MASS J06164006-6407194 BD* 06 16 40.06 -64 07 19.5           sdL5 15 0
6 2MASSI J0727182+171001 BD* 07 27 18.24600 +17 10 01.2072           T7.0 77 0
7 2MASSI J0937347+293142 BD* 09 37 34.87968 +29 31 40.9908           T6 80 0
8 2MASS J09393548-2448279 BD* 09 39 35.48976 -24 48 27.9432           T8 51 0
9 2MASS J11145133-2618235 BD* 11 14 51.33720 -26 18 23.5620           T7.5 34 0
10 ULAS J123327.45+121952.2 BD* 12 33 27.44304 +12 19 52.1832           T3.5 6 0
11 2MASS J12373919+6526148 BD* 12 37 39.19632 +65 26 14.8092           T6.5 64 0
12 2MASS J12563716-0224522 BD* 12 56 37.1381711583 -02 24 52.253650704           esdL3.5 33 0
13 ULAS J135058.86+081506.8 BD* 13 50 58.86 +08 15 06.8           L5 9 0
14 ULAS J141623.94+134836.3 BD* 14 16 23.94216 +13 48 36.3204           T7.5p 42 0
15 2MASS J14162408+1348263 BD* 14 16 24.0749913652 +13 48 26.176168678           L5 63 0
16 HD 130342 * 14 47 07.1499333715 +18 20 25.959447648   8.79 8.32     F4V 23 0
17 2MASS J16262034+3925190 BD* 16 26 20.1331562643 +39 25 19.489643721       19.67 16.68 esdL4 44 0
18 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12457 0

To bookmark this query, right click on this link: simbad:objects in 2010MNRAS.404.1952B and select 'bookmark this link' or equivalent in the popup menu


2021.10.27-06:58:34

© Université de Strasbourg/CNRS

    • Contact