Multiple Companions to HD 154857 and HD 160691

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 1.8M_J. An outer companion has a period much longer than 2 yr and is currently detected only as a linear trend of 14 m s^-1 yr^-1. 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 1.7M_J. 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 3.1M_J. With these orbital parameters, its maximum separation from the star of 0.4" makes it a viable target for direct imaging.

Based on observations obtained at the Anglo-Australian Telescope, Siding Spring, Australia.