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The 'DODO' survey - I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2)

Burleigh, M. R. and Clarke, F. J. and Hogan, E. and Brinkworth, C. S. and Bergeron, P. and Dufour, P. and Dobbie, P. D. and Levan, A. J. and Hodgkin, S. T. and Hoard, D. W. and Wachter, S. (2008) The 'DODO' survey - I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2). Monthly Notices of the Royal Astronomical Society, 386 (1). L5-L9. ISSN 0035-8711. doi:10.1111/j.1745-3933.2008.00446.x.

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We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa2), from deep J-band imaging with Gemini North and Spitzer Infrared Array Camera (IRAC) mid-IR photometry. We find no resolved common proper motion companions to vMa2 at separations from 3 to 45 arcsec, at a limiting magnitude of J≈ 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 MJup(Teff≈ 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 Teff= 6030 ± 240 K, log g= 8.10 ± 0.04 and, hence, M= 0.633 ± 0.022 M⊙. We then place a 3σ upper limit of 10 ± 2 MJup on the mass of any unresolved companion in the 4.5 μm band.

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Hoard, D. W.0000-0002-6800-6519
Additional Information:© 2008 The Authors. Journal compilation © 2008 RAS. Accepted 2008 January 21. Received 2008 January 18; in original form 2007 December 19. Published Online: 5 March 2008. MB acknowledges receipt of a STFC Advanced Fellowship. EH acknowledges the support of a STFC Postgraduate Studentship. This work is supported in part by the NSERC Canada. PB is a Cottrell Scholar of Research Corporation. Based in part on observations obtained at the Gemini Observatory. We thank Isabelle Baraffe and Jay Farihi for their enlightening thoughts and comments.
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Science and Technology Facilities Council (STFC)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Cottrell Scholar of Research CorporationUNSPECIFIED
Subject Keywords:stars: low-mass; brown dwarfs; planetary systems; white dwarfs; infrared: stars
Issue or Number:1
Record Number:CaltechAUTHORS:BURmnras08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13241
Deposited By: Tony Diaz
Deposited On:06 Feb 2009 05:58
Last Modified:08 Nov 2021 22:36

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