Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search

Abstract

The determination of accurate stellar parameters of giant stars is essential for our understanding of such stars in general and as exoplanet host stars in particular. Precise stellar masses are vital for determining the lower mass limit of potential substellar companions with the radial velocity method. Our goal is to determine stellar parameters, including mass, radius, age, surface gravity, effective temperature and luminosity, for the sample of giants observed by the Lick planet search. Furthermore, we want to derive the probability of these stars being on the horizontal branch (HB) or red giant branch (RGB), respectively. We compare spectroscopic, photometric and astrometric observables to grids of stellar evolutionary models using Bayesian inference. We provide tables of stellar parameters, probabilities for the current post-main sequence evolutionary stage, and probability density functions for 372 giants from the Lick planet search. We find that $81\%$ of the stars in our sample are more probably on the HB. In particular, this is the case for 15 of the 16 planet host stars in the sample. We tested the reliability of our methodology by comparing our stellar parameters to literature values and find very good agreement. Furthermore, we created a small test sample of 26 giants with available asteroseismic masses and evolutionary stages and compared these to our estimates. The mean difference of the stellar masses for the 24 stars with the same evolutionary stages by both methods is only $⟨\Delta M⟩=0.01\pm 0.20{\mathrm{M}}_{\odot }$. We do not find any evidence for large systematic differences between our results and estimates of stellar parameters based on other methods. In particular we find no significant systematic offset between stellar masses provided by asteroseismology to our Bayesian estimates based on evolutionary models.

15 pages, 7 figures, accepted for publication in A&A

References in corpus (27)

• Gaia Data Release 2. Summary of the contents and survey properties
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Estimating distances from parallaxes
• New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies
• Basic physical parameters of a selected sample of evolved stars
• Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity
• Precise radial velocities of giant stars. III. Spectroscopic stellar parameters
• Hot Jupiters and Cool Stars
• Spectroscopic determination of masses (and implied ages) for red giants
• Period spacings in red giants II. Automated measurement
• Estimating distances from parallaxes. II. Performance of Bayesian distance estimators on a Gaia-like catalogue
• Planet Engulfment by ~1.5-3 Solar-Mass Red Giants
• Precise radial velocities of giant stars: I. Stable stars
• On the Semimajor Axis Distribution of Extrasolar Gas Giant Planets: Why Hot Jupiters Are Rare Around High-Mass Stars
• Precise radial velocities of giant stars. IV. A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties
• A Substellar Companion to the Intermediate-Mass Giant 11 Com
• Determining Ages of APOGEE Giants with Known Distances
• Homogeneous spectroscopic parameters for bright planet host stars from the northern hemisphere
• Long-lived, long-period radial velocity variations in Aldebaran: A planetary companion and stellar activity
• The Radial Velocity Variability of the K-giant Gamma Draconis: Stellar Variability Masquerading as a Planet
• The masses of retired A stars with asteroseismology: Kepler and K2 observations of exoplanet hosts
• Asteroseismic masses of retired planet-hosting A-stars using SONG
• Beyond the Main Sequence: Testing the accuracy of stellar masses predicted by the PARSEC evolutionary tracks
• Spectroscopic study of red giants in the Kepler field with asteroseismologically established evolutionary status and stellar parameters
• Detection of solar-like oscillations in the bright red giant stars $\gamma$ Psc and ${\theta }^1$ Tau from a 190-day high-precision spectroscopic multisite campaign
• Precise radial velocities of giant stars IX. HD 59686 Ab: a massive circumstellar planet orbiting a giant star in a ~13.6 au eccentric binary system
• The discovery of a planetary candidate around the evolved low-mass Kepler giant star HD 175370

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• Red Supergiant Candidates for Multimessenger Monitoring of the Next Galactic Supernova
• SPECIES II. Stellar parameters of the EXPRESS program giant star sample
• Li-rich K giants, dust excess, and binarity
• Asteroseismic masses of four evolved planet-hosting stars using SONG and TESS: resolving the retired A-star mass controversy
• Atmospheres and UV Environments of Earth-like Planets Throughout Post-Main Sequence Evolution
• Reaching the boundary between stellar kinematic groups and very wide binaries. IV. The widest Washington double star systems with rho > 1000 arcsec in Gaia DR3
• Hiding Planets Near and Far: The Parameter Space of Hidden Companions for Known Planetary Systems
• Precise radial velocities of giant stars XV. Mysterious nearly periodic radial velocity variations in the eccentric binary $\epsilon$ Cygni
• Weighing stars from birth to death: mass determination methods across the HRD
• Non-radial oscillations mimicking a brown dwarf orbiting the cluster giant NGC 4349 No. 127
• One of Everything: The Breakthrough Listen Exotica Catalog
• Precise radial velocities of giant stars -- XVII. Distinguishing planets from intrinsically induced radial velocity signals in evolved stars
• Precise radial velocities of giant stars XIII. A second Jupiter orbiting in 4:3 resonance in the 7 CMa system
• High resolution Spectra of Earth-Like Planets Orbiting Red Giant Host Stars
• Composite-Spectrum Binaries, Paper XXIII: HD 69479/80, a 90-day binary with a cool-giant primary
• A new third planet and the dynamical architecture of the HD33142 planetary system
• A Catalog of Homogeneously Derived Stellar Parameters for Spectroscopic Survey Stars