The Pan-Pacific Planet Search. II. Confirmation of a two-planet system around HD 121056

Abstract

Precise radial velocities from the Anglo-Australian Telescope confirm the presence of a rare short-period planet around the K0 giant HD 121056. An independent two-planet solution using the AAT data shows that the inner planet has P=89.1+/-0.1 days, and m sin i=1.35+/-0.17 Mjup. These data also confirm the planetary nature of the outer companion, with m sin i=3.9+/-0.6 Mjup and a=2.96+/-0.16 AU. HD 121056 is the most-evolved star to host a confirmed multiple-planet system, and is a valuable example of a giant star hosting both a short-period and a long-period planet.

arXiv commentAccepted for publication in ApJ

References in corpus (63)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Validation of the new Hipparcos reduction
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Planetary Candidates Observed by Kepler, III: Analysis of the First 16 Months of Data
• The HARPS search for southern extra-solar planets XXXI. The M-dwarf sample
• Validation of Kepler's Multiple Planet Candidates. III: Light Curve Analysis & Announcement of Hundreds of New Multi-planet Systems
• The Exoplanet Orbit Database
• Stellar Spin-Orbit Misalignment in a Multiplanet System
• The Orbital Evolution of Gas Giant Planets around Giant Stars
• The Y^2 Stellar Evolutionary Tracks
• Detection Limits from the McDonald Observatory Planet Search Program
• Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants
• The HARPS search for southern extra-solar planets. X. A m sin i = 11 Mearth planet around the nearby spotted M dwarf GJ 674
• Exploring The Frequency Of Close-In Jovian Planets Around M Dwarfs
• Foretellings of Ragnarök: World-engulfing Asymptotic Giants and the Inheritance of White Dwarfs
• Hot Jupiters and Cool Stars
• Retired A Stars and Their Companions. III. Comparing the Mass-Period Distributions of Planets Around A-Type Stars and Sun-Like Stars
• Can Planets survive Stellar Evolution?
• The Habitable-Zone Planet Finder: A Stabilized Fiber-Fed NIR Spectrograph for the Hobby-Eberly Telescope
• APF - The Lick Observatory Automated Planet Finder
• The CRIRES Search for Planets Around the Lowest-Mass Stars. I. High-Precision Near-Infrared Radial Velocities with an Ammonia Gas Cell
• First Results from the Anglo-Australian Planet Search - A Brown Dwarf Candidate and a 51 Peg-like Planet
• Systemic: A Testbed For Characterizing the Detection of Extrasolar Planets. I. The Systemic Console Package
• Retired A Stars and Their Companions: Eighteen New Jovian Planets
• Planet Engulfment by ~1.5-3 Solar-Mass Red Giants
• Extrasolar planets and brown dwarfs around A-F type stars. I. Performances of radial velocity measurements, first analyses of variations
• Long-term evolution of three-planet systems to the post-Main Sequence and beyond
• An Eccentric Hot Jupiter Orbiting the Subgiant HD 185269
• Kepler-91b: a planet at the end of its life. Planet and giant host star properties via light-curve variations
• A dynamical analysis of the proposed HU Aquarii planetary system
• Retired A Stars and Their Companions VI. A Pair of Interacting Exoplanet Pairs Around the Subgiants 24 Sextanis and HD200964
• An Investigation into the Radial Velocity Variations of CoRoT-7
• Forever alone? Testing single eccentric planetary systems for multiple companions
• New and updated stellar parameters for 71 evolved planet hosts. On the metallicity - giant planet connection
• The Pan-Pacific Planet Search. I. A Giant Planet Orbiting 7 CMa
• A hot Jupiter orbiting the 1.7 Msun Subgiant HD102956
• Substellar-mass companions to the K-dwarf BD +14 4559 and the K-giants HD 240210 and BD +20 2457
• The Anglo-Australian Planet Search. XXII. Two New Multi-Planet Systems
• The McDonald Observatory Planet Search: New Long-Period Giant Planets, and Two Interacting Jupiters in the HD 155358 System
• "Retired" Planet Hosts: Not So Massive, Maybe Just Portly After Lunch
• On the dynamical stability of the proposed planetary system orbiting NSVS 14256825
• A Detailed Dynamical Investigation of the Proposed QS Virginis Planetary System
• On the Frequency of Jupiter Analogs
• Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets. I. Sample definition and physical properties
• Discovery of a planet around the K giant star 4 UMa
• A Planet in a 0.6-AU Orbit Around the K0 Giant HD 102272
• HD 137510: An Oasis in the Brown Dwarf Desert
• Kepler-432 b: a massive planet in a highly eccentric orbit transiting a red giant
• A Double Planetary System around the Evolved Intermediate-Mass Star HD 4732
• A long-period planet orbiting a nearby Sun-like star
• The Mass Distribution of Subgiant Planet Hosts
• A Detailed Investigation of the Proposed NN Serpentis Planetary System
• ROPS: A New Search for Habitable Earths in the Southern Sky
• The Physical Parameters of the Retired A Star HD185351
• Retired A Stars: The Effect of Stellar Evolution on the Mass Estimates of Subgiants
• Substellar Companions to Evolved Intermediate-Mass Stars: HD 145457 and HD 180314
• Observing Strategies for the Detection of Jupiter Analogs
• A planetary system and a highly eccentric brown dwarf around the giant stars HIP67851 and HIP97233
• The California Planet Survey II. A Saturn-Mass Planet Orbiting the M Dwarf Gl649
• A Dynamical Investigation of the Proposed BD +20 2457 System
• The Proposed Quadruple System SZ Herculis: Revised LITE Model and Orbital Stability Study
• False-alarm probability in relation to over-sampled power spectra, with application to Super-Kamiokande solar neutrino data
• Radial velocities of giant stars: an investigation of line profile variations

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• 3-D selection of 167 sub-stellar companions to nearby stars
• A-type Stars, the Destroyers of Worlds: The lives and deaths of Jupiters in evolving stellar binaries
• Precise radial velocities of giant stars XVI. Planet occurrence rates from the combined analysis of the Lick, EXPRESS, and PPPS giant star surveys
• Giant planets around two intermediate-mass evolved stars and confirmation of the planetary nature of HIP67851 c
• The K2-HERMES Survey. I. Planet Candidate Properties from K2 Campaigns 1-3
• The Pan-Pacific Planet Search VII: The most eccentric planet orbiting a giant star
• The Pan-Pacific Planet Search. IV. Two super-Jupiters in a 3:5 resonance orbiting the giant star HD33844
• The Pan-Pacific Planet Search VI: Giant planets orbiting HD 86950 and HD 222076
• The Pan-Pacific Planet Search. VIII. Complete results and the occurrence rate of planets around low-luminosity giants
• The Pan-Pacific Planet Search III: Five companions orbiting giant stars
• The Pan-Pacific Planet Search V. Fundamental Parameters for 164 Evolved Stars
• Unseen companions of V Hya inferred from periodic ejections
• Using Asteroseismology to Calibrate the Physical Parameters of Confirmed Exoplanets and Their Evolved Host Stars
• Stability analysis of three exoplanet systems
• A new third planet and the dynamical architecture of the HD33142 planetary system