The Planet around 51 Pegasi

Details The Planet around 51 Pegasi The Planet around 51 Pegasi

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.7004m&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #70.04; Bulletin of the American Astronomical Society, Vol. 27, p.1379

Astronomy and Astrophysics

Astronomy

14

Scientific paper

We have obtained over 100 radial velocity measurements of 51 Peg at a precision of 5 \ms, spanning 2 months. We confirm the report of Mayor and Queloz that its velocity varies with a period of 4.22d and low amplitude, indicative of a planetary companion. Our measurements yield the following orbital elements, at the time of writing (1995 Oct.30): P=4.21+/-.02d, K=51.0+/-1.5 \ms, e=0.02+/-0.02 . The curve is sinusoidal within the errors, implying a circular orbit for the planet. Assuming solar mass for the 51 Peg, the planet has minimum mass: Msin i=0.41 \mjup. The sinusoidal velocities are superimposed on a linear increase in velocity, dv/dt = 0.7 \ms per day, indicating the presence of a second companion having mass greater than 10 \mjup and period greater than ~ 1 yr. This second companion may be self-luminous and thus detectable with direct IR imaging.

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