Burleigh, Matthew R., Clarke, F. J., Hogan, E., Brinkworth, C. S., Bergeron, P., Dufour, P., Dobbie, P. D., Levan, A. J., Hodgkin, S. T., Hoard, D. W. (Donald Wayne) and Wachter, S.. (2008) The 'DODO' survey - I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa 2). Monthly Notices of the Royal Astronomical Society, Vol.386 (No.1). L5-L9. ISSN 0035-8711

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Abstract

We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa 2), from deep J- band imaging with Gemini North and Spitzer Infrared Array Camera ( IRAC) mid- IR photometry. We find no resolvedcommonproper motion companions to vMa 2 at separations from 3 to 45 arcsec, at a limiting magnitude of J approximate to 23. Assuming a total age for the system of 4.1 +/- 1 Gyr, and utilizing the latest evolutionary models for substellar objects, this limit is equivalent to companion masses > 7 +/- 1 M-Jup( T-eff approximate to 300 K). Taking into account the likely orbital evolution of very low mass companions in the post-main- sequence phase, these J- band observations effectively survey orbits around the white dwarf progenitor from 3 to 50 au. There is no flux excess detected in any of the complimentary Spitzer IRAC mid- IR filters. We fit a white dwarf model atmosphere to the optical BVRI, JHK and IRAC photometry. The best solution gives T-eff = 6030 +/- 240 K, log g= 8.10 +/- 0.04 and, hence, M = 0.633 +/- 0.022M(circle dot). We then place a 3 sigma upper limit of 10 +/- 2M(Jup) on the mass of any unresolved companion in the 4.5 mu m band.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Low mass stars, Brown dwarf stars, Extrasolar planets, White dwarf stars, Infrared astronomy
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley-Blackwell Publishing, Inc
ISSN:	0035-8711
Date:	1 May 2008
Volume:	Vol.386
Number:	No.1
Number of Pages:	5
Page Range:	L5-L9
Identification Number:	10.1111/j.1745-3933.2008.00446.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Natural Sciences and Engineering Research Council Canada (NSERC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/30200

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