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An Infrared Coronagraphic Survey for Substellar Companions

By SpaceRef Editor
June 16, 2005
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An Infrared Coronagraphic Survey for Substellar Companions

Astrophysics, abstract

From: Patrick J. Lowrance [view email]
Date: Wed, 15 Jun 2005 22:32:01 GMT (335kb)

An Infrared Coronagraphic Survey for Substellar Companions

P.Lowrance (SSC),
E. E. Becklin (UCLA),
G. Schneider (UofA),
D. Kirkpatrick (IPAC),
A.Weinberger (Carnegie),
B. Zuckerman (UCLA),
C.Dumas (ESO),
J.L.Beuzit (Grenoble),
P.Plait (Sonoma State),
E.Malumuth (Goddard),
S.Heap (Goddard),
R.Terrile (JPL),
D. Hines (SSI)

Comments: 11 figures, accepted by AJ

We have used the F160W filter (1.4-1.8 um) and the coronagraph on the
Near-InfraRed Camera and Multi-Object Spectrometer (NICMOS) on the Hubble Space
Telescope (HST) to survey 45 single stars with a median age of 0.15 Gyr, an
average distance of 30 pc, and an average H-magnitude of 7 mag. For the median
age we were capable of detecting a 30 M_Jup companion at separations between 15
and 200 AU. A 5 M_Jup object could have been detected at 30 AU around 36% of
our primaries. For several of our targets that were less than 30 Myr old, the
lower mass limit was as low as a Jupiter mass, well into the high mass planet
region. Results of the entire survey include the proper motion verification of
five low-mass stellar companions, two brown dwarfs (HR7329B and TWA5B) and one
possible brown dwarf binary (Gl 577B/C).

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