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Detection of a Neptune-mass planet in the rho Cancri system using the Hobby-Eberly Telescope

By SpaceRef Editor
August 31, 2004
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Astrophysics, abstract

From: G. Fritz Benedict [view email]
Date: Tue, 31 Aug 2004 15:40:06 GMT (161kb)

Detection of a NEPTUNE-mass planet in the $
ho^{1}$ Cancri system using
the Hobby-Eberly Telescope

Barbara E. McArthur,
Michael Endl,
William D. Cochran,
G. Fritz Benedict,
Debra A. Fischer,
Geoffrey W. Marcy,
R. Paul Butler,
Dominique Naef,
Michel Mayor,
Diedre Queloz,
Stephane Udry,
Thomas E. Harrison

Comments: Accepted by ApJ Letters

We report the detection of the lowest mass extra-solar planet yet found
around a Sun-like star – a planet with an msini of only 14.21 $pm$ 2.91 Earth
masses in an extremely short period orbit (P=2.808 days) around $
Cancri, a planetary system which already has three known planets. Velocities
taken from late 2003-2004 at McDonald Observatory with the Hobby-Eberly
Telescope (HET) revealed this inner planet at 0.04 AU. We estimate an
inclination of the outer planet $
ho^{1}$ Cancri d, based upon {it Hubble
Space Telescope} Fine Guidance Sensor (FGS) measurements. This inclination
suggests an inner planet of only 17.7 $pm$ 5.57 Earth masses, if coplanarity
is assumed for the system.

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