On the Double Planet System Around HD 83443

Details On the Double Planet System Around HD 83443 On the Double Planet System Around HD 83443

2002-06-11

arxiv.org/abs/astro-ph/0206178v1

Astrophys.J.578:565-572,2002

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1086/342471

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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