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http://hdl.handle.net/2381/21602
Title: | White dwarfs in the UKIRT Infrared Deep Sky Survey Large Area Survey: The substellar companion fraction |
Authors: | Burleigh, M. R. Jameson, R. F. Barstow, M. A. Satterthwaite, R. P. Dobbie, P. D. |
First Published: | 1-Oct-2011 |
Publisher: | Oxford University Press (OUP) |
Citation: | Monthly Notices of the Royal Astronomical Society , 2011, 416 (4), pp. 2768-2791 |
Abstract: | We present a near-infrared photometric search for unresolved substellar companions and debris discs around white dwarfs in the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey. We cross-correlate the Sloan Digital Sky Survey (SDSS) DR4 and McCook & Sion catalogues of white dwarfs with the UKIDSS DR8 producing 3109 and 163 unique matches, respectively. Cooling models are fitted to the optical photometry of a subsample of DA white dwarfs and extended to the near-infrared. A comparison is then made with the observed photometry to identify those stars with a near-infrared excess consistent with the presence of a cool companion or debris disc. Where present, we have estimated the approximate spectral type of any putative companion, or an upper limit on the temperature of a debris disc. In total we identify 14–16 new candidate white dwarf + very low mass stellar systems, 9–11 candidate white dwarf + brown dwarf systems, and three candidate white dwarf + debris discs. We place lower limits on the unresolved (<2 arcsec) companions to all DA white dwarfs and thus assess the sensitivity of UKIDSS to such objects. We use this result to estimate unresolved binary fractions of fWD + dL≥ 0.4 ± 0.3 per cent, fWD + dT≥ 0.2 per cent and fWD + BD≥ 0.5 ± 0.3 per cent. |
DOI Link: | 10.1111/j.1365-2966.2011.19225.x |
ISSN: | 0035-8711 |
eISSN: | 1365-2966 |
Links: | http://hdl.handle.net/2381/21602 http://mnras.oxfordjournals.org/content/416/4/2768 |
Version: | Publisher Version |
Status: | Peer-reviewed |
Type: | Journal Article |
Rights: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2011 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website. |
Appears in Collections: | Published Articles, Dept. of Physics and Astronomy |
Files in This Item:
File | Description | Size | Format | |
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MNRAS-2011-Steele-2768-91.pdf | Published (publisher PDF) | 9.75 MB | Adobe PDF | View/Open |
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