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American Astronomical Society, Astrophysical Journal, 1(555), p. 410-417, 2001

DOI: 10.1086/321467

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Two New Planets from the Anglo-Australian Planet Search

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Precise Doppler measurements from the Anglo-Australian Telescope (AAT) UCLES spectrometer reveal periodic Keplerian velocity variations in the stars HD 160691 and HD 27442. HD 160691 has a period of 743 days, a semiamplitude of 54 m s~1, and a high eccentricity, e \ 0.62, typical of extrasolar planets orbiting beyond 0.2 AU. The minimum (M sin i) mass of the companion is 1.97 and the M J , semimajor axis is 1.65 AU. HD 27442 has a 415 day period, a semiamplitude of 32 m s~1, and an eccen- tricity of 0.058. The minimum mass is 1.43 and the semimajor axis is 1.18 AU. This is the —rst M J , extrasolar planet orbiting beyond 0.2 AU that is in a circular orbit similar to solar system planets. The photon-limited precision of AAT/UCLES measurements i s3ms ~1 as demonstrated by stable stars and Keplerian —ts to planet-bearing stars. In addition, we present con—rmation of four previously announced planets. Subject headings: planetary systemsstars: individual (HD 160691, HD 27442)