SETI bioastro: Limits to Substellar Objects around nearby White Dwarfs using CFHT

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Paper: astro-ph/0509854
Date: Wed, 28 Sep 2005 19:59:54 GMT (482kb)

Title: Cool Customers in the Stellar Graveyard III: Limits to Substellar
Objects around nearby White Dwarfs using CFHT

Authors: J.H. Debes, J. Ge, C. Ftaclas

Categories: astro-ph

Comments: 20 pages, 6 figures, Accepted to AJ
\\
Results from a groundbased high contrast imaging survey of thirteen nearby
white dwarfs for substellar objects is presented. We place strict upper
limits
on the type of substellar objects present, ruling out the presence of
anything
larger than $\sim$14 M$_{Jup}$ for eight of the white dwarfs at separations
$>$19 AU and corresponding to primordial separations of $\sim$3-6~AU
assuming
adiabatic mass loss without tidal interactions.

With these results we place the first upper limit on the number of
intermediate mass stars with brown dwarfs at separations $>$ 13 AU. We
combine
these results with previous work to place upper limits on the number of
massive
Jovian ($>$ 10 M$_{Jup}$) planets in orbit around white dwarfs whose
progenitors spanned a mass range of 1-7 M$_{\odot}$.

\\ ( http://arXiv.org/abs/astro-ph/0509854 , 482kb)

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