The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-Period Planets
Autor: | Benjamin E. Nelson, Howard Isaacson, Andrew W. Howard, Geoffrey W. Marcy, Y. Katherina Feng, Jason T. Wright, Eric B. Ford, Sharon X. Wang |
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Jazyk: | angličtina |
Rok vydání: | 2015 |
Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Physics Orbital elements FOS: Physical sciences Astronomy Astronomy and Astrophysics Planetary system Giant star Exoplanet Orbit 13. Climate action Space and Planetary Science Planet Hot Jupiter Astrophysics::Earth and Planetary Astrophysics Stellar evolution Astrophysics - Earth and Planetary Astrophysics |
Popis: | 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 $1 M_{\rm Jup}$ 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 $2 M_{\rm Jup}$ 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 $> 5$ 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. 16 pages, 13 figures. Accepted for publication in ApJ |
Databáze: | OpenAIRE |
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