Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-28
Astron.J.131:640-647,2006
Astronomy and Astrophysics
Astrophysics
20 pages, 6 figures, Accepted to AJ, minor edits
Scientific paper
10.1086/498740
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$_{\odot}$.
Debes John H.
Ftaclas Chris
Ge Jian
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