2009A&A...508..823B


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.12CEST14:01:56

2009A&A...508..823B - Astronomy and Astrophysics, volume 508, 823-831 (2009/12-3)

Young T-dwarf candidates in IC 348.

BURGESS A.S.M., MORAUX E., BOUVIER J., MARMO C., ALBERT L. and BOUY H.

Abstract (from CDS):

The determination of the lower-end of the initial mass function (IMF) provides strong constraints on star formation theories. We report here on a search for isolated planetary-mass objects in the 3Myr-old star-forming region IC 348. Deep, narrowband CH4off and CH4on images were obtained with CFHT/WIRCam over 0.11sq.deg. in the central part of IC 348 to identify young T-dwarfs from their 1.6µm methane absorption bands. We report three faint T-dwarf candidates with CH4on-CH4off colours >0.4mag. Extinction was estimated for each candidate and lies in the range AV∼5-12mag. Comparisons with T-dwarf spectral models, and colour/colour and colour/magnitude diagrams, reject two of the three candidates because of their extreme z'-J blueness. The one remaining object is not thought to be a foreground field dwarf because of a number density argument and also its strong extinction AV∼12mag, or thought to be a background field T-dwarf which would be expected to be much fainter. Models and diagrams give this object a preliminary T6 spectral type. With a few Jupiter masses, the young T-dwarf candidate reported here is potentially amongst the youngest, lowest mass objects detected in a star-forming region so far. Its frequency is consistent with the extrapolation of current lognormal IMF estimates down to the planetary mass domain.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: low-mass, brown dwarfs - open clusters and associations: individual: IC 348 - stars: luminosity function, mass function - infrared: stars

Nomenclature: Tables 3-4: [BMB2009] IC348 CH4 N (Nos 1-3).

Simbad objects: 13

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Number of rows : 13

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 BRLT 38 BD* 01 51 41.55936 +12 44 30.0768           T0.5 63 0
2 Ass Per OB 1 As* 02 21 +57.6           ~ 163 1
3 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1130 0
4 Ass Per OB 2 As* 03 42.2 +33 26           ~ 313 0
5 IC 348 OpC 03 44 34 +32 09.8           ~ 1252 1
6 [BMB2009] IC348 CH4 1 BD? 03 44 49.24 +32 02 48.4           ~ 1 0
7 [BMB2009] IC348 CH4 2 BD? 03 44 49.52 +32 06 35.4           ~ 4 0
8 [BMB2009] IC348 CH4 3 BD? 03 44 57.95 +31 56 43.3           ~ 1 0
9 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 149 0
10 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1504 1
11 [BZR99] S Ori 70 BD* 05 38 10.10 -02 36 26.0           T6-7 46 0
12 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 500 0
13 NAME Upper Sco Association As* 16 12 -23.4           ~ 1094 1

    Equat.    Gal    SGal    Ecl

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2021.04.12-14:01:56

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