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

Abstract

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${}_{\odot }$.

20 pages, 6 figures, Accepted to AJ, minor edits

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Cited by in corpus (7)

• A Spitzer White Dwarf Infrared Survey
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• Near-Infrared Constraints on the Presence of Warm Dust at Metal-Rich, Helium Atmosphere White Dwarfs
• The DODO Survey II: A Gemini Direct Imaging Search for Substellar and Planetary Mass Companions around Nearby Equatorial and Northern Hemisphere White Dwarfs
• A New Method for Finding Nearby White Dwarf Exoplanets and Detecting Biosignatures
• Cool Customers in the Stellar Graveyard IV: Spitzer Search for Mid-IR excesses Around Five DAs
• Search for giant planets around seven white dwarfs in the Hyades cluster with the Hubble Space Telescope