Rosell, AC;
Santiago, B;
dal Ponte, M;
Burningham, B;
da Costa, LN;
James, DJ;
Marshall, JL;
... Walker, AR; + view all
(2019)
Brown dwarf census with the Dark Energy Survey year 3 data and the thin disc scale height of early L types.
Monthly Notices of the Royal Astronomical Society
, 489
(4)
pp. 5301-5325.
10.1093/mnras/stz2398.
Preview |
Text
Brooks_Brown dwarf census with the Dark Energy Survey year 3 data and the thin disc scale height of early L types_VoR.pdf - Published Version Download (3MB) | Preview |
Abstract
n this paper we present a catalogue of 11 745 brown dwarfs with spectral types ranging from L0 to T9, photometrically classified using data from the Dark Energy Survey (DES) year 3 release matched to the Vista Hemisphere Survey (VHS) DR3 and Wide-field Infrared Survey Explorer (WISE) data, covering ≈2400 deg^{2} up to iAB = 22. The classification method follows the same phototype method previously applied to SDSS-UKIDSS-WISE data. The most significant difference comes from the use of DES data instead of SDSS, which allow us to classify almost an order of magnitude more brown dwarfs than any previous search and reaching distances beyond 400 pc for the earliest types. Next, we also present and validate the GalmodBD simulation, which produces brown dwarf number counts as a function of structural parameters with realistic photometric properties of a given survey. We use this simulation to estimate the completeness and purity of our photometric LT catalogue down to iAB = 22, as well as to compare to the observed number of LT types. We put constraints on the thin disc scale height for the early L (L0–L3) population to be around 450 pc, in agreement with previous findings. For completeness, we also publish in a separate table a catalogue of 20 863 M dwarfs that passed our colour cut with spectral types greater than M6. Both the LT and the late M catalogues are found at DES release page https://des.ncsa.illinois.edu/releases/other/y3-mlt.
| Type: | Article |
|---|---|
| Title: | Brown dwarf census with the Dark Energy Survey year 3 data and the thin disc scale height of early L types |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stz2398 |
| Publisher version: | https://doi.org/10.1093/mnras/stz2398 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | techniques: photometric, catalogues, surveys, brown dwarfs, Galaxy: fundamental parameters, infrared: stars |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10084602 |
Archive Staff Only
 |
View Item |
