On the Double Planet System Around HD 83443

Astrophysics, abstract
astro-ph/0206178

From: Geoffrey W. Marcy <gmarcy@etoile.berkeley.edu>

Date: Tue, 11 Jun 2002 21:00:07 GMT   (105kb)

On the Double Planet System Around HD 83443

Authors:
R. Paul Butler (1),
Geoffrey W. Marcy (2 and 3),
Steven S. Vogt (4),
C. G. Tinney (5),
Hugh R. A. Jones (6),
Chris McCarthy (1),
Alan J. Penny (7),
Kevin Apps (8),
Brad D. Carter (9) ((1) Carnegie Institution of Washington, (2) University of California, Berkeley, (3) San Francisco State University, (4) UCO/Lick Observatory, (5) Anglo-Australian Observatory, (6) Astrophysics Research Institute, Liverpool John Moores University, UK, (7) Rutherford Appleton Laboratory, UK, (8) Physics and Astronomy, University of Sussex, UK, (9) Faculty of Sciences, University of Southern Queensland, Australia)

Comments: 26 pages incl. 3 tables and 8 figures; uses AASTEX

The Geneva group has reported two Saturn-mass planets orbiting HD 83443 (K0V)
with periods of 2.98 and 29.8 d. The two planets have raised interest in their
dynamics because of the possible 10:1 orbital resonance and the strong
gravitational interactions. We report precise Doppler measurements of HD 83443
obtained with the Keck/HIRES and the AAT/UCLES spectrometers. These
measurements strongly confirm the inner planet with period of 2.985 d, with
orbital parameters in very good agreement with those of the Geneva group.
However these Doppler measurements show no evidence of the outer planet, at
thresholds of 1/4 (3 m/s) of the reported velocity amplitude of 13.8 m/s. Thus,
the existence of the outer planet is in question. Indeed, the current Doppler
measurements reveal no evidence of any second planet with periods less than a
year.

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