Astrophys. J., 617, 575-579 (2004/December-2)
Multiple companions to HD 154857 and HD 160691.
McCARTHY C., BUTLER R.P., TINNEY C.G., JONES H.R.A., MARCY G.W., CARTER B., PENNY A.J. and FISCHER D.A.
Abstract (from CDS):
Precise Doppler measurements from the Anglo-Australian Telescope (AAT) UCLES spectrometer reveal two companions to both HD 154857 and HD 160691. The inner companion to HD 154857 has a period of 398 days, an eccentricity of 0.51, and a minimum mass of 1.8MJ. An outer companion has a period much longer than 2 yr and is currently detected only as a linear trend of 14 m/s/yr. The inner companion to HD 160691, previously announced from AAT data, has a period of 645 days, an eccentricity of 0.20, and a minimum mass of 1.7MJ. For the outer planet, whose orbit is less well constrained, a two-Keplerian fit yields a period of 8.2 yr, an eccentricity of 0.57, and a minimum mass of 3.1MJ. With these orbital parameters, its maximum separation from the star of 0".4 makes it a viable target for direct imaging.
Stars: Planetary Systems - Stars: Individual: Henry Draper Number: HD 154857 - Stars: Individual: Henry Draper Number: HD 160691
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