New planet around giant star and updates for 7 systems

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New planet around giant star and updates for 7 systems

Post by Edasich on 6th January 2015, 4:24 am

The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-Period Planets

We present an update to seven stars with long-period planets or planetary candidates using new and archival radial velocities from Keck-HIRES and literature velocities from other telescopes. Our updated analysis better constrains orbital parameters for these planets, four of which are known multi-planet systems. HD 24040 b and HD 183263 c are super-Jupiters with circular orbits and periods longer than 8 yr. We present a previously unseen linear trend in the residuals of HD 66428 indicative on an additional planetary companion. We confirm that GJ 849 is a multi-planet system and find a good orbital solution for the c component: it is a 1MJup planet in a 15 yr orbit (the longest known for a planet orbiting an M dwarf). We update the HD 74156 double-planet system. We also announce the detection of HD 145934 b, a 2MJup planet in a 7.5 yr orbit around a giant star. Two of our stars, HD 187123 and HD 217107, at present host the only known examples of systems comprising a hot Jupiter and a planet with a well constrained period >5 yr, and with no evidence of giant planets in between. Our enlargement and improvement of long-period planet parameters will aid future analysis of origins, diversity, and evolution of planetary systems.
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Re: New planet around giant star and updates for 7 systems

Post by Lazarus on 6th January 2015, 2:17 pm

HD 74156 "d" refuted again!

HD 183263 goes into the category of systems with inner eccentric giants and outer circular ones. This despite the wide spacing between the two planets (unlike, say, Gliese 876 which is dominated by resonances).

Gliese 849 looks like a rather "classical" system, with wide-orbiting gas giants on nice near-circular orbits. Wonder what the limits are on stuff in the inner system.
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Re: New planet around giant star and updates for 7 systems

Post by Edasich on 6th January 2015, 7:06 pm

Linear trend in HD 66428 seems to hint the presence of an additional planet (ca. 1.7 MJup) or a (sub)stellar companion at larger separation too.
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