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Proceedings Paper

First three planets
Author(s): Geoff W. Marcy; R. Paul Butler
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Paper Abstract

The first three extrasolar planets orbiting Solar-like stars have recently been discovered. All three were inferred from a periodicity in the optical Doppler measurements of their host stars, indicating a reflex motion in response to the gravitational force exerted by the planets. From such measurements and standard Newtonian physics, one may infer the orbital period and value of MPL sin i of 0.46, 2.5 and 6.5 MJUP, and orbital periods of 4.2, 117 and 1100 days, respectively. The most massive planet (around 70 Vir) has an eccentricity, e equals 0.38, larger than any in our Solar System, and one (around 51 Peg) has an orbital radius of 0.05 AU which is smaller than any in our Solar System. A general theory for the formation of planets must include these new characteristics.

Paper Details

Date Published: 24 June 1996
PDF: 4 pages
Proc. SPIE 2704, The Search for Extraterrestrial Intelligence (SETI) in the Optical Spectrum II, (24 June 1996); doi: 10.1117/12.243440
Show Author Affiliations
Geoff W. Marcy, San Francisco State Univ. and Univ. of California/Berkeley (United States)
R. Paul Butler, San Francisco State Univ. and Univ. of California/Berkeley (United States)


Published in SPIE Proceedings Vol. 2704:
The Search for Extraterrestrial Intelligence (SETI) in the Optical Spectrum II
Stuart A. Kingsley; Guillermo A. Lemarchand, Editor(s)

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