2013A&A...550L...2L


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST02:13:17

2013A&A...550L...2L - Astronomy and Astrophysics, volume 550, L2-2 (2013/2-1)

GTC OSIRIS z-band imaging of Y dwarfs.

LODIEU N., BEJAR V.J.S. and REBOLO R.

Abstract (from CDS):

The aim of the project is to contribute to the characterisation of the spectral energy distribution of the coolest brown dwarfs discovered to date, the Y dwarfs. We obtained z-band far-red imaging for six Y dwarfs and a T9+Y0 binary with the OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy) instrument on the 10.4-m Gran Telescopio de Canarias (GTC). We detect five of the seven known Y dwarfs in the z-band, infer their optical-to-infrared colours, and measure their proper motions. We find a higher dispersion in the z-J and z-H colours of Y0 dwarfs than in T dwarfs. This dispersion is found to be correlated with H-w2. The high dispersion in the optical-to-infrared colours of Y dwarfs and the possible turnover towards bluer colours may be a consequence of the presence of sulfide clouds with different thicknesses, the depletion of alcalines, and/or gravity effects.

Abstract Copyright:

Journal keyword(s): stars: low-mass - brown dwarfs - techniques: photometric

Simbad objects: 9

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Number of rows : 9

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 WISE J014656.66+423410.0 BD* 01 46 56.668 +42 34 10.05           Y0 19 0
2 WISE J041022.71+150248.4 BD* 04 10 22.71288 +15 02 48.4620           Y0 30 0
3 UGPS J072227.51-054031.2 BD* 07 22 27.51096 -05 40 31.2096           T9 62 0
4 WISE J121756.90+162640.8 BD* 12 17 56.90808 +16 26 40.8372           T9+Y0 30 0
5 WISE J140518.39+553421.3 BD* 14 05 18.39384 +55 34 21.3996           Y0(pec?) 47 0
6 CFBDS J145829+101343 ** 14 58 29.40072 +10 13 41.7108           T8+Y0 25 0
7 WISE J173835.53+273259.0 BD* 17 38 35.53440 +27 32 59.0964           Y0 47 0
8 WISE J182831.08+265037.7 BD* 18 28 31.08696 +26 50 37.7196           Y0 40 0
9 WISE J205628.91+145953.2 BD* 20 56 28.91952 +14 59 53.2248           Y0 31 0

    Equat.    Gal    SGal    Ecl

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2020.08.14-02:13:17

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