A Hot Saturn Planet Orbiting HD 88133, from the N2K Consortium

Astrophysics, abstract
astro-ph/0409107

From: Debra A. Fischer [view email]

Date: Mon, 6 Sep 2004 08:21:04 GMT   (91kb)

Authors:
D. A. Fischer,
G. Laughlin,
R. P. Butler,
G. W. Marcy,
J. Johnson,
G. Henry,
J. Valenti,
S. S. Vogt,
M. Ammons,
S. Robinson,
G. Spear,
J. Strader,
P. Driscoll,
A. Fuller,
T. Johnson,
E. Manrao,
C. McCarthy,
M. Muñoz,
K. L. Tah,
J. Wright,
S. Ida,
B. Sato,
D. Minniti

The N2K consortium is carrying out a distributed observing campaign with the
Keck, Magellan and Subaru telescopes, as well as the automatic photometric
telescopes of Fairborn Observatory, in order to search for short-period gas
giant planets around metal-rich stars. We have established a reservoir of more
than 14,000 main sequence and subgiant stars, closer than 110 pc, brighter than
V=10.5 and with $0.4 < B-V < 1.2$. Because the fraction of stars with planets
is a sensitive function of stellar metallicity, a broadband photometric
calibration has been developed to identify a subset of 2000 stars with [Fe/H]
$> 0.1$ dex for this survey. We outline the strategy and report the detection
of a planet orbiting the metal-rich G5IV star HD 88133 with a period of 3.41
days, semi-velocity amplitude, K=35.7 mse and msini = 0.29 mjupe.
Photometric observations reveal that HD 88133 is constant on the 3.415-day
radial velocity period to a limit of 0.0005 mag. Despite a transit probability
of 15.6%, our photometry rules out the shallow transits predicted by the large
stellar radius.

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