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The 'DODO' survey - I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa 2)

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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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Official URL: http://dx.doi.org/10.1111/j.1745-3933.2008.00446.x

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

ISSN:

0035-8711

Official Date:

1 May 2008

Dates:

Date	Event
1 May 2008	UNSPECIFIED

Volume:

Vol.386

Number:

No.1

Number of Pages:

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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