The California planet survey IV: A planet orbiting the giant star HD 145934 and updates to seven systems with long-period planets

Y. Katherina Feng, Jason T. Wright, Benjamin Nelson, Sharon X. Wang, Eric B. Ford, Geoffrey W. Marcy, Howard Isaacson, Andrew W. Howard

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

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 of 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 1 M Jup 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 2 M Jup 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 greater than 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.

Original languageEnglish (US)
Article number22
JournalAstrophysical Journal
Volume800
Issue number1
DOIs
StatePublished - Feb 10 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'The California planet survey IV: A planet orbiting the giant star HD 145934 and updates to seven systems with long-period planets'. Together they form a unique fingerprint.

Cite this