Revisiting the Red-giant Branch Hosts KOI-3886 and $\iota$ Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters

Abstract

Asteroseismology is playing an increasingly important role in the characterization of red-giant host stars and their planetary systems. Here, we conduct detailed asteroseismic modeling of the evolved red-giant branch (RGB) hosts KOI-3886 and $\iota$ Draconis, making use of end-of-mission Kepler (KOI-3886) and multi-sector TESS ($\iota$ Draconis) time-series photometry. We also model the benchmark star KIC 8410637, a member of an eclipsing binary, thus providing a direct test to the seismic determination. We test the impact of adopting different sets of observed modes as seismic constraints. Inclusion of $\ell =1$ and 2 modes improves the precision on the stellar parameters, albeit marginally, compared to adopting radial modes alone, with $1.9$-$3.0\%$ (radius), $5$-$9\%$ (mass), and $19$-$25\%$ (age) reached when using all p-dominated modes as constraints. Given the very small spacing of adjacent dipole mixed modes in evolved RGB stars, the sparse set of observed g-dominated modes is not able to provide extra constraints, further leading to highly multimodal posteriors. Access to multi-year time-series photometry does not improve matters, with detailed modeling of evolved RGB stars based on (lower-resolution) TESS data sets attaining a precision commensurate with that based on end-of-mission Kepler data. Furthermore, we test the impact of varying the atmospheric boundary condition in our stellar models. We find mass and radius estimates to be insensitive to the description of the near-surface layers, at the expense of substantially changing both the near-surface structure of the best-fitting models and the values of associated parameters like the initial helium abundance, $Y_{\mathrm{i}}$. Attempts to measure $Y_{\mathrm{i}}$ from seismic modeling of red giants may thus be systematically dependent on the choice of atmospheric physics.

Accepted for publication in The Astronomical Journal (AJ)

References in corpus (52)

• Modules for Experiments in Stellar Astrophysics (MESA)
• The Transiting Exoplanet Survey Satellite
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• The K2 Mission: Characterization and Early results
• A new correction of stellar oscillation frequencies for near-surface effects
• Mixed modes in red giants: a window on stellar evolution
• Angular momentum transport by heat-driven g-modes in slowly pulsating B stars
• A Guide to Realistic Uncertainties on Fundamental Properties of Solar-Type Exoplanet Host Stars
• Testing the asteroseismic scaling relations for Red Giants with Eclipsing Binaries Observed by Kepler
• Planetary Candidates Observed by Kepler V: Planet Sample from Q1-Q12 (36 Months)
• Stellar parameters and chemical abundances of 223 evolved stars with and without planets
• Impact on asteroseismic analyses of regular gaps in Kepler data
• The asteroseismic potential of TESS: exoplanet-host stars
• DIAMONDS: a new Bayesian Nested Sampling tool. Application to Peak Bagging of solar-like oscillations
• Gap interpolation by inpainting methods : Application to Ground and Space-based Asteroseismic data
• A Hot Saturn Orbiting An Oscillating Late Subgiant Discovered by TESS
• Seeing double with K2: Testing re-inflation with two remarkably similar planets around red giant branch stars
• Deep Learning Classification in Asteroseismology
• Theoretical power spectra of mixed modes in low mass red giant stars
• Modelling Kepler Red Giants in Eclipsing Binaries:Calibrating the Mixing Length Parameter with Asteroseismology
• Why should we correct reported pulsation frequencies for stellar line-of-sight Doppler velocity shifts?
• A New Method for the Asteroseismic Determination of the Evolutionary State of Red-Giant Stars
• Giant planet occurrence within 0.2 AU of low-luminosity red giant branch stars with K2
• The Aarhus Red Giants Challenge I: Stellar structures in the red giant branch phase
• TESS Asteroseismology of the known red-giant host stars HD 212771 and HD 203949
• Asteroseismology of 36 Kepler subgiants -- II: Determining ages from detailed modelling
• Gaussian Process modelling of granulation and oscillations in red-giant stars
• Asteroseismology and Exoplanets: Proceedings of the IVth Azores International Advanced School in Space Sciences
• Asteroseismology of 3,642 Kepler Red Giants: Correcting the Scaling Relations based on Detailed Modeling
• Semi-analytic Expressions for the Isolation and Coupling of Mixed Modes
• TESS Giants Transiting Giants II: The hottest Jupiters orbiting evolved stars
• On the asymptotic acoustic-mode phase in red-giant stars and its dependence on evolutionary state
• Seismic signature of electron degeneracy in the core of red giants: hints for mass transfer between close red-giant companions
• The Aarhus red giants challenge II. Stellar oscillations in the red giant branch phase
• The Discovery of Stellar Oscillations in the K Giant $\iota$ Dra
• Investigating surface correction relations for RGB stars
• Tess asteroseismology of the known planet host star ${\lambda }^2$ Fornacis
• Science Extraction from TESS Observations of Known Exoplanet Hosts
• Seismic performance
• $\text{TESS}$ Giants Transiting Giants I: A Non-inflated Hot Jupiter Orbiting a Massive Subgiant
• Fast and Automated Peak Bagging with DIAMONDS (FAMED)
• TESS Asteroseismic Analysis of the Known Exoplanet Host Star HD 222076
• Differential Modelling Systematics across the HR Diagram from Asteroseismic Surface Corrections
• Mixed Modes and Asteroseismic Surface Effects: I. Analytic Treatment
• Stellar atmospheric parameters of FGK-type stars from high-resolution optical and near-infrared CARMENES spectra
• Evolution of the gravity offset of mixed modes in RGB stars
• Robust asteroseismic properties of the bright planet host HD 38529
• TESS Giants Transiting Giants III: An eccentric warm Jupiter supports a period-eccentricity relation for giant planets transiting evolved stars
• Clumpiness: Time-domain classification of red-giant evolutionary states
• Asteroseismic masses of four evolved planet-hosting stars using SONG and TESS: resolving the retired A-star mass controversy
• TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting An Extremely Eccentric Exoplanet
• Uncovering the ultimate planet impostor. An eclipsing brown dwarf in a hierarchical triple with two evolved stars

Cited by in corpus (5)

• An asteroseismic age estimate of the open cluster NGC 6866 using Kepler and Gaia
• Pushing the boundaries of asteroseismic individual frequency modelling: unveiling two evolved very-low metallicity red giants
• Precise radial velocities of giant stars -- XVII. Distinguishing planets from intrinsically induced radial velocity signals in evolved stars
• Dissecting stellar populations with manifold learning I. Validation of the method on a synthetic Milky Way-like galaxy
• Halo Photometry and Asteroseismology for 98 of the Brightest Stars Observed by TESS