The Pan-Pacific Planet Search VI: Giant planets orbiting HD 86950 and HD 222076

Abstract

We report the detection of two new planets orbiting the K giants HD 86950 and HD 222076, based on precise radial velocities obtained with three instruments: AAT/UCLES, FEROS, and CHIRON. HD 86950b has a period of 1270$\pm$57 days at $a=2.72\pm$0.08 AU, and m sin $i=3.6\pm$0.7 Mjup. HD 222076b has $P=871\pm$19 days at $a=1.83\pm$0.03 AU, and m sin $i=1.56\pm$0.11 Mjup. These two giant planets are typical of the population of planets known to orbit evolved stars. In addition, we find a high-amplitude periodic velocity signal ($K\sim$50 m/s) in HD 29399, and show that it is due to stellar variability rather than Keplerian reflex motion. We also investigate the relation between planet occurrence and host-star metallicity for the 164-star Pan-Pacific Planet Search sample of evolved stars. In spite of the small sample of PPPS detections, we confirm the trend of increasing planet occurrence as a function of metallicity found by other studies of planets orbiting evolved stars.

Accepted for publication in AJ

References in corpus (54)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Validation of the new Hipparcos reduction
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• The AKARI/IRC Mid-Infrared All-Sky Survey
• The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
• The metal-rich nature of stars with planets
• A disintegrating minor planet transiting a white dwarf
• The Exoplanet Orbit Database
• State of the Field: Extreme Precision Radial Velocities
• Stellar Activity Masquerading as Planets in the Habitable Zone of the M dwarf Gliese 581
• CHIRON - A Fiber Fed Spectrometer for Precise Radial Velocities
• Fundamental parameters and infrared excesses of Hipparcos stars
• Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity
• The Exoplanet Orbit Database II: Updates to exoplanets.org
• Precise radial velocities of giant stars. III. Spectroscopic stellar parameters
• Planets around evolved intermediate-mass stars. I. Two substellar companions in the open clusters NGC 2423 and NGC 4349
• Detecting Planets Around Very Low Mass Stars with the Radial Velocity Method
• Stellar Parameters and Elemental Abundances of Late-G Giants
• Retired A Stars and Their Companions. III. Comparing the Mass-Period Distributions of Planets Around A-Type Stars and Sun-Like Stars
• The Sun as a planet-host star: Proxies from SDO images for HARPS radial-velocity variations
• Ghost in the time series: no planet for Alpha Cen B
• Evolved stars hint to an external origin of enhanced metallicity in planet-hosting stars
• Systemic: A Testbed For Characterizing the Detection of Extrasolar Planets. I. The Systemic Console Package
• An Eccentric Hot Jupiter Orbiting the Subgiant HD 185269
• Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
• Planetary detection limits taking into account stellar noise. II. Effect of stellar spot groups on radial-velocities
• Stellar activity mimics a habitable-zone planet around Kapteyn's star
• Drifting Asteroid Fragments Around WD 1145+017
• The Anglo-Australian Planet Search XXIV: The Frequency of Jupiter Analogs
• 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
• Uncovering the planets and stellar activity of CoRoT-7 using only radial velocities
• The properties of planets around giant stars
• The metallicity signature of evolved stars with planets
• Do stellar magnetic cycles influence the measurement of precise radial velocities?
• Precise radial velocities of giant stars. IV. A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties
• The Frequency of Low-Mass Exoplanets. III. Toward eta-Earth at Short Periods
• 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
• Stellar activity as noise in exoplanet detection II. Application to M dwarfs
• Four new planets around giant stars and the mass-metallicity correlation of planet-hosting stars
• Planetary companions around the K giant stars 11 UMi and HD 32518
• A Double Planetary System around the Evolved Intermediate-Mass Star HD 4732
• Comment on "Stellar activity masquerading as planets in the habitable zone of the M dwarf Gliese 581"
• Spatially Resolved Images of Dust Belt(s) Around the Planet-hosting Subgiant Kappa CrB
• The Pan-Pacific Planet Search. II. Confirmation of a two-planet system around HD 121056
• The Pan-Pacific Planet Search. IV. Two super-Jupiters in a 3:5 resonance orbiting the giant star HD33844
• Pursuing the planet-debris disk connection: Analysis of upper limits from the Anglo-Australian Planet Search
• A 12-Year Activity Cycle for HD 219134
• Determination of the spectroscopic stellar parameters for 257 field giant stars
• The Pan-Pacific Planet Search III: Five companions orbiting giant stars
• A catalog of rotational and radial velocities for evolved stars V. Southern stars
• A Pair of Giant Planets around the Evolved Intermediate-Mass Star HD 47366: Multiple Circular Orbits or a Mutually Retrograde Configuration
• The Pan-Pacific Planet Search V. Fundamental Parameters for 164 Evolved Stars
• Is there a metallicity enhancement in planet hosting red giants?

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• Precise radial velocities of giant stars XVI. Planet occurrence rates from the combined analysis of the Lick, EXPRESS, and PPPS giant star surveys
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• Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions
• The Pan-Pacific Planet Search. VIII. Complete results and the occurrence rate of planets around low-luminosity giants
• The Penn State - Toruń Centre for Astronomy Planet Search stars IV. Dwarfs and the complete sample
• TESS Asteroseismic Analysis of the Known Exoplanet Host Star HD 222076
• Planets around the evolved stars 24 Booties and $\gamma$ Libra: A 30d-period planet and a double giant-planet system in possible 7:3 MMR
• SPECIES II. Stellar parameters of the EXPRESS program giant star sample
• Four Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS
• Regular Radial Velocity Variations in Nine G- and K-type Giant Stars: Eight Planets and One Planet Candidate
• HD 76920b pinned down: a detailed analysis of the most eccentric planetary system around an evolved star
• The future influence of six exoplanets on the envelope properties of their parent stars on the giant branches
• Coralie radial-velocity search for companions around evolved stars (CASCADES) III. A new Jupiter host-star: in-depth analysis of HD 29399 using TESS data
• HD 83443c: A highly eccentric giant planet on a 22-year orbit
• Re-analysing the dynamical stability of the HD 47366 planetary system
• The Homogenous Study of Transiting Systems (HoSTS). II. The influence of the line list on stellar parameters
• Stability analysis of three exoplanet systems
• A candidate giant planet companion to the massive, young white dwarf GALEX J071816.4+373139 informs the occurrence of giant planets orbiting B stars
• Asteroseismology of iota Draconis and Discovery of an Additional Long-Period Companion