2017A&A...602A..82D


Query : 2017A&A...602A..82D

2017A&A...602A..82D - Astronomy and Astrophysics, volume 602A, 82-82 (2017/6-1)

CFBDSIR 2149-0403: young isolated planetary-mass object or high-metallicity low-mass brown dwarf?

DELORME P., DUPUY T., GAGNE J., REYLE C., FORVEILLE T., LIU M.C., ARTIGAU E., ALBERT L., DELFOSSE X., ALLARD F., HOMEIER D., MALO L., MORLEY C., NAUD M.E. and BONNEFOY M.

Abstract (from CDS):

Aims. We conducted a multi-wavelength, multi-instrument observational characterisation of the candidate free-floating planet CFBDSIR J214947.2-040308.9, a late T-dwarf with possible low-gravity features, in order to constrain its physical properties.
Methods. We analysed nine hours of X-shooter spectroscopy with signal detectable from 0.8 to 2.3µm, as well as additional photometry in the mid-infrared using the Spitzer Space Telescope. Combined with a VLT/HAWK-I astrometric parallax, this enabled a full characterisation of the absolute flux from the visible to 5µm, encompassing more than 90% of the expected energy emitted by such a cool late T-type object. Our analysis of the spectrum also provided the radial velocity and therefore the determination of its full 3D kinematics.
Results. While our new spectrum confirms the low gravity and/or high metallicity of CFBDSIR 2149, the parallax and kinematics safely rule out membership to any known young moving group, including AB Doradus. We use the equivalent width of the KI doublet at 1.25µm as a promising tool to discriminate the effects of low-gravity from the effects of high-metallicity on the emission spectra of cool atmospheres. In the case of CFBDSIR 2149, the observed KI doublet clearly favours the low-gravity solution.
Conclusions. CFBDSIR 2149 is therefore a peculiar late-T dwarf that is probably a young, planetary-mass object (2-13MJup, <500Myr) possibly similar to the exoplanet 51 Eri b, or perhaps a 2-40MJup brown dwarf with super-solar metallicity.

Abstract Copyright: © ESO, 2017

Journal keyword(s): brown dwarfs - planets and satellites: gaseous planets - stars: atmospheres - methods: observational - techniques: spectroscopic - techniques: spectroscopic

CDS comments: Fig.1 some objects not identified (incomplete format)

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME THA As* 00 00 -62.0           ~ 468 0
2 Cl Alessi 13 OpC 03 27 02.9 -35 49 16           ~ 74 0
3 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 165 0
4 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3082 0
5 * 51 Eri b Pl 04 37 36.1326090888 -02 28 24.775726260           ~ 181 0
6 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1023 0
7 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 282 0
8 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 472 0
9 NAME eta Cha Association OpC 08 42 32.9 -78 57 47           ~ 363 0
10 NAME TW Hya Association As* 11 01.9 -34 42           ~ 942 0
11 2MASS J11101001+0116130 BD* 11 10 10.01064 +01 16 13.0872           T5.5 76 0
12 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 161 1
13 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 439 2
14 BD+13 2618C BD* 13 00 42.08415 +12 21 15.0536         23.28 T8.5p 130 0
15 * e Vir b Pl 13 16 46.5148594512 +09 25 26.960139646           ~ 110 1
16 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 777 0
17 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 225 1
18 HD 131977 BY* 14 57 28.0007918772 -21 24 55.727265310 7.89 6.83 5.72 4.74 4.19 K4V 486 0
19 CFBDS J150411+102717 BD* 15 04 11.72688 +10 27 16.9128           T7.0 26 0
20 HD 182488B BD* 19 23 34.0126 +33 13 19.078           T9 69 0
21 HD 182488 PM* 19 23 34.0131683760 +33 13 19.078425912       5.8   K0V 280 1
22 2MASS J21140802-2251358 BD* 21 14 08.02560 -22 51 35.8380           L7.5 112 0
23 Wolf 940 B BD* 21 46 38.829 -00 10 38.59           T8+/Y? 57 0
24 CFBDS J214947-040308 BD* 21 49 47.20 -04 03 08.9           T7 27 0
25 HD 218396b Pl 23 07 28.7157209544 +21 08 03.310767492           ~ 278 1
26 NAME Coma Berenices Moving Group MGr ~ ~           ~ 84 0
27 NAME Argus Association As* ~ ~           ~ 230 0
28 NAME Carina Association As* ~ ~           ~ 155 1
29 NAME Carina-near Moving Group MGr ~ ~           ~ 91 0
30 NAME Octans Association As* ~ ~           ~ 90 0

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