Imperial College London
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ProfessorStephenWarren

Faculty of Natural Sciences, Department of Physics

Professor of Astrophysics
 
 
 
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Contact

 

+44 (0)20 7594 7554s.j.warren Website

 
 
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Location

 

1115Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Skrzypek:2015:0004-6361/201424570,
author = {Skrzypek, N and Warren, SJ and Faherty, JK and Mortlock, DJ and Burgasser, AJ and Hewett, PC},
doi = {0004-6361/201424570},
journal = {Astronomy & Astrophysics},
title = {Photometric brown-dwarf classification I. A method to identify and accurately classify large samples of brown dwarfs without spectroscopy},
url = {http://dx.doi.org/10.1051/0004-6361/201424570},
volume = {574},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Aims. We present a method, named photo-type, to identify and accurately classify L and T dwarfs onto the standard spectral classification system using photometry alone. This enables the creation of large and deep homogeneous samples of these objects efficiently, without the need for spectroscopy.Methods. We created a catalogue of point sources with photometry in 8 bands, ranging from 0.75 to 4.6 μm, selected from an area of 3344 deg2, by combining SDSS, UKIDSS LAS, and WISE data. Sources with 13.0 <J< 17.5, and Y − J> 0.8, were then classified by comparison against template colours of quasars, stars, and brown dwarfs. The L and T templates, spectral types L0 to T8, were created by identifying previously known sources with spectroscopic classifications, and fitting polynomial relations between colour and spectral type.Results. Of the 192 known L and T dwarfs with reliable photometry in the surveyed area and magnitude range, 189 are recovered by our selection and classification method. We have quantified the accuracy of the classification method both externally, with spectroscopy, and internally, by creating synthetic catalogues and accounting for the uncertainties. We find that, brighter than J = 17.5, photo-type classifications are accurate to one spectral sub-type, and are therefore competitive with spectroscopic classifications. The resultant catalogue of 1157 L and T dwarfs will be presented in a companion paper.
AU  - Skrzypek,N
AU  - Warren,SJ
AU  - Faherty,JK
AU  - Mortlock,DJ
AU  - Burgasser,AJ
AU  - Hewett,PC
DO  - 0004-6361/201424570
PY  - 2015///
SN  - 1432-0746
TI  - Photometric brown-dwarf classification I. A method to identify and accurately classify large samples of brown dwarfs without spectroscopy
T2  - Astronomy & Astrophysics
UR  - http://dx.doi.org/10.1051/0004-6361/201424570
UR  - http://hdl.handle.net/10044/1/21933
VL  - 574
ER  -
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