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 journalArticle

14 Citations (Scopus)

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

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giant stars
planets
planet
Jupiter (planet)
Jupiter
orbits
stars
orbitals
planetary systems
circular orbits
radial velocity
telescopes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Katherina Feng, Y. ; Wright, Jason T. ; Nelson, Benjamin ; Wang, Sharon X. ; Ford, Eric B. ; Marcy, Geoffrey W. ; Isaacson, Howard ; Howard, Andrew W. / The California planet survey IV : A planet orbiting the giant star HD 145934 and updates to seven systems with long-period planets. In: Astrophysical Journal. 2015 ; Vol. 800, No. 1.
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The California planet survey IV : A planet orbiting the giant star HD 145934 and updates to seven systems with long-period planets. / Katherina Feng, Y.; Wright, Jason T.; Nelson, Benjamin; Wang, Sharon X.; Ford, Eric B.; Marcy, Geoffrey W.; Isaacson, Howard; Howard, Andrew W.

In: Astrophysical Journal, Vol. 800, No. 1, 22, 10.02.2015.

Research output: Contribution to journalArticle

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