Three red giants with substellar-mass companions

Abstract

We present three giant stars from the ongoing Penn State-Toruń Planet Search with the Hobby-Eberly Telescope, which exhibit radial velocity variations that point to a presence of planetary --mass companions around them. BD+49 828 is a $M=1.52\pm 0.22$ $M_{\odot }$ K0 giant with a $msini$=$1.6_{-0.2}^{+0.4}$ $M_J$ minimum mass companion in $a=4.2_{-0.2}^{+0.32}$ AU ($2590_{-180}^{+300}$d), $e=0.35_{-0.10}^{+0.24}$ orbit. HD 95127, a log$L$/$L_{\odot }$=$2.28\pm 0.38$, $R=20\pm 9$ $R_{\odot }$, $M=1.20\pm 0.22$ $M_{\odot }$ K0 giant has a $msini$=$5.01_{-0.44}^{+0.61}$ $M_J$ minimum mass companion in $a=1.28_{-0.01}^{+0.01}$ AU ($482_{-5}^{+5}$d), $e=0.11_{-0.06}^{+0.15}$ orbit. Finally, HD 216536, is a $M=1.36\pm 0.38$ $M_{\odot }$ K0 giant with a $msini=1.47_{-0.12}^{+0.20}$ $M_J$ minimum mass companion in $a=0.609_{-0.002}^{+0.002}$ AU ($148.6_{-0.7}^{+0.7}$d), $e=0.38_{-0.10}^{+0.12}$ orbit. Both, HD 95127 b and HD 216536 b in their compact orbits, are very close to the engulfment zone and hence prone to ingestion in the near future. BD+49 828 b is among the longest period planets detected with the radial velocity technique until now and it will remain unaffected by stellar evolution up to a very late stage of its host. We discuss general properties of planetary systems around evolved stars and planet survivability using existing data on exoplanets in more detail.

arXiv comment47 pages, 11 figures. Accepted by ApJ

References in corpus (86)

• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Validation of the new Hipparcos reduction
• Habitable Zones Around Main-Sequence Stars: New Estimates
• The WASP Project and the SuperWASP Cameras
• Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data
• Planet Migration and Binary Companions: the case of HD 80606b
• The CORALIE survey for southern extra-solar planets VII. Two short-period Saturnian companions to HD108147 and HD168746
• Northern Sky Variability Survey (NSVS): Public data release
• Validation of Kepler's Multiple Planet Candidates. III: Light Curve Analysis & Announcement of Hundreds of New Multi-planet Systems
• Planet formation around stars of various masses: The snow line and the frequency of giant planets
• Basic physical parameters of a selected sample of evolved stars
• Kepler Asteroseismology Program: Introduction and First Results
• Scaled solar tracks and isochrones in a large region of the Z-Y plane I. From the ZAMS to the TP-AGB end for 0.15 - 2.5 Mo stars
• Tidal Decay of Close Planetary Orbits
• WASP-12b: The hottest transiting planet yet discovered
• The first WASP public data release
• Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
• A Planetary Companion to gamma Cephei A
• The Initial-Final Mass Relation: Direct Constraints at the Low Mass End
• The Orbital Evolution of Gas Giant Planets around Giant Stars
• Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants
• The accretion of planets and brown dwarfs by giant stars -- II. solar mass stars on the red giant branch
• A New Version of Reimers' law of Mass Loss Based on a Physical Approach
• Asteroseismology of red giants from the first four months of Kepler data: Fundamental parameters
• Solar-like oscillations in low-luminosity red giants: first results from Kepler
• Planets around evolved intermediate-mass stars. I. Two substellar companions in the open clusters NGC 2423 and NGC 4349
• Planet Hunters: A Transiting Circumbinary Planet in a Quadruple Star System
• Hot Jupiters and Cool Stars
• Dynamical Instabilities in Extrasolar Planetary Systems Containing Two Giant Planets
• Distant future of the Sun and Earth revisited
• Observational Evidence for Tidal Destruction of Exoplanets
• Retired A Stars and Their Companions. III. Comparing the Mass-Period Distributions of Planets Around A-Type Stars and Sun-Like Stars
• Efficient fitting of multiplanet Keplerian models to radial velocity and astrometry data
• Can Planets survive Stellar Evolution?
• Six New Planets from the Keck Precision Velocity Survey
• Transit Timing Observations from Kepler: VII. Confirmation of 27 planets in 13 multiplanet systems via Transit Timing Variations and orbital stability
• Transits and Occultations of an Earth-Sized Planet in an 8.5-Hour Orbit
• Ten Year Review of Queue Scheduling of the Hobby-Eberly Telescope
• On the Orbits of Low-mass Companions to White Dwarfs and the Fates of the Known Exoplanets
• The Accretion of Brown Dwarfs and Planets by Giant Stars -- I. AGB Stars
• Retired A Stars and Their Companions: Eighteen New Jovian Planets
• Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars
• Planet Engulfment by ~1.5-3 Solar-Mass Red Giants
• Confirmation of the Planet Hypothesis for the Long-period Radial Velocity Variations of Beta Geminorum
• Tides and Tidal Engulfment in Post-Main Sequence Binaries: Period Gaps for Planets and Brown Dwarfs Around White Dwarfs
• Kepler-91b: a planet at the end of its life. Planet and giant host star properties via light-curve variations
• Long-term magnetic activity of a sample of M-dwarf stars from the HARPS program II. Activity and radial velocity
• H-alpha Activity of Old M Dwarfs: Stellar Cycles and Mean Activity Levels For 93 Low-Mass Stars in the Solar Neighborhood
• Stellar Evolution in NGC 6791: Mass Loss on the Red Giant Branch and the Formation of Low Mass White Dwarfs
• A Planetary Mass Companion to the K0 Giant HD 17092
• Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Del, xi Aql, and HD 81688
• Characterisation of red-giant stars in the public Kepler data
• Massive planet migration: Theoretical predictions and comparison with observations
• 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
• WASP-103b: a new planet at the edge of tidal disruption
• 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
• White Dwarf Cosmochronology in the Solar Neighborhood
• The First Planets: the Critical Metallicity for Planet Formation
• The First HET Planet: A Companion to HD 37605
• Long Secondary Periods in Variable Red Giants
• A Substellar Companion to the Intermediate-Mass Giant 11 Com
• The Role of Planet Accretion in Creating the Next Generation of Red Giant Rapid Rotators
• Long period variables in 47 Tuc: direct evidence for lost mass
• Substellar-Mass Companions to the K-Giants HD 240237, BD +48 738 and HD 96127
• Planetary-mass companions to the K-giants BD+15 2940 and HD 233604
• A Double Planetary System around the Evolved Intermediate-Mass Star HD 4732
• The Great Escape III: Placing post-main-sequence evolution of planetary and binary systems in a Galactic context
• Where is the second planet in the HD 160691 planetary system?
• On the extrasolar multi-planet system around HD160691
• Constraints on a second planet in the WASP-3 system
• Substellar Companions to Seven Evolved Intermediate-Mass Stars
• The Penn State - Torun Centre for Astronomy Planet Search stars. II. Lithium abundance analysis of the Red Giant Clump sample
• About putative Neptune-like extrasolar planetary candidates
• Substellar Companions to Evolved Intermediate-Mass Stars: HD 145457 and HD 180314
• Planetary companion candidates around the K giant stars 42 Dra and HD 139357
• The Effects of Planets and Brown Dwarfs on Stellar Rotation and Mass-Loss
• Planet Traps and First Planets: the Critical Metallicity for Gas Giant Formation
• Precise radial velocities of giant stars V. A brown dwarf and a planet orbiting the K giant stars tau Gem and 91 Aqr
• Planetary companions orbiting M giants HD 208527 and HD 220074
• The Penn State-Torun Centre for Astronomy Planet Search stars. I. Spectroscopic analysis of 348 red giants
• The spin-orbit alignment of the transiting exoplanet WASP-3b from Rossiter-McLaughlin observations
• Empirical determination of the integrated red giant and horizontal branch stellar mass loss in omega Centauri
• Planetary companions in K giants beta Cancri, mu Leonis, and beta Ursae Minoris
• Constraints on planet formation via gravitational instability across cosmic time

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