2014A&A...570L...8B


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET00:46:28

2014A&A...570L...8B - Astronomy and Astrophysics, volume 570, L8-8 (2014/10-1)

Temperature constraints on the coldest brown dwarf known: WISE 0855-0714.

BEAMIN J.C., IVANOV V.D., BAYO A., MUZIC K., BOFFIN H.M.J., ALLARD F., HOMEIER D., MINNITI D., GROMADZKI M., KURTEV R., LODIEU N., MARTIN E.L. and MENDEZ R.A.

Abstract (from CDS):

Nearby isolated planetary mass objects are beginning to be discovered, but their individual properties are poorly constrained because their low surface temperatures and strong molecular self-absorption make them extremely faint. We aimed to detect the near-infrared emission of the coldest brown dwarf (BD) found so far, WISE0855-0714, located ∼2.2pc away, and to improve its temperature estimate (Teff=225-260K) from a comparison with state-of-the-art models of BD atmospheres. We observed the field containing WISE0855-0714 with HAWK-I at the VLT in the Y band. For BDs with Teff<500K theoretical models predict strong signal (or rather less molecular absorption) in this band. WISE0855-0714 was not detected in our Y-band images, thus placing an upper limit on its brightness to Y>24.4mag at 3σ level, leading to Y-[4.5]>10.5. Combining this limit with previous detections and upper limits at other wavelengths, WISE0855-0714 is confirmed as the reddest BD detected, further supporting its status as the coldest known brown dwarf. We applied spectral energy distribution fitting with collections of models from two independent groups for extremely cool BD atmospheres leading to an effective temperature of Teff<250K.

Abstract Copyright:

Journal keyword(s): brown dwarfs - infrared: stars - stars: low-mass - stars: individual: WISE 0855-0714 - proper motions - neighborhood solar

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 2682 93 * 08 51 15.0498366526 +11 49 21.136610495 14.881 14.77 14.186   13.470 G2V 43 0
2 WISEA J085510.74-071442.5 BD* 08 55 10.83 -07 14 42.5           Y2 49 0
3 EGGR 70 WD* 10 33 42.7629684770 -11 41 38.339441758 11.851 12.847 13.012 13.138 13.278 DA1.9 103 0
4 Wolf 359 Fl* 10 56 28.826208 +07 00 52.34400 16.706 15.541 13.507 11.684 9.507 M6Ve 623 0
5 FS 132 * 12 21 39.2798102356 -00 07 12.150160494   13.88 13.33     G1 17 0
6 FS 136 * 14 59 32.0174219124 -00 06 16.895065901   15.80 14.68     K2 7 0
7 WISE J182831.08+265037.7 BD* 18 28 31.087 +26 50 37.72           Y0 39 0

    Equat.    Gal    SGal    Ecl

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2019.11.14-00:46:28

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