Asteroseismology of the Multiplanet System K2-93

Abstract

We revisit the analysis of the bright multiplanet system K2-93, discovered with data taken by the K2 mission. This system contains five identified planets ranging in size from sub-Neptune to Jupiter size. The K2 data available at the discovery of the system only showed single transits for the three outer planets, which allowed weak constraints to be put on their periods. As these planets are interesting candidates for future atmospheric studies, a better characterization of the host star and tighter constraints on their orbital periods are essential. Using new data from the K2 mission taken after the discovery of the system, we perform an asteroseismic characterization of the host star. We are able to place strong constraints on the stellar parameters and obtain a value for the stellar mass of $1.22_{-0.02}^{+0.03}{\mathrm{M}}_{\odot }$, a stellar radius of $1.30\pm 0.01{\mathrm{R}}_{\odot }$, and an age of $2.07_{-0.27}^{+0.36}$ Gyr. Put together with the additional transits identified for two of the three outer planets, we constrain the orbital periods of the outer planets and provide updated estimates for the stellar reflex velocities induced by the planets.

arXiv comment15 pages, 9 figures, accepted for publication in the Astronomical Journal

References in corpus (61)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The Spitzer Space Telescope Mission
• Analytic Lightcurves for Planetary Transit Searches
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• The K2 Mission: Characterization and Early results
• batman: BAsic Transit Model cAlculatioN in Python
• On the Unique Solution of Planet and Star Parameters from an Extrasolar Planet Transit Light Curve
• Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology
• ADIPLS -- the Aarhus adiabatic oscillation package
• Measurement of Spin-Orbit Alignment in an Extrasolar Planetary System
• Improved spectroscopic parameters for transiting planet hosts
• Parametrizing the exoplanet eccentricity distribution with the Beta distribution
• Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
• Eccentricity from transit photometry: small planets in Kepler multi-planet systems have low eccentricities
• A revised estimate of the occurrence rate of terrestrial planets in the habitable zones around kepler m-dwarfs
• Standing on the shoulders of Dwarfs: the $Kepler$ asteroseismic LEGACY sample I - oscillation mode parameters
• Probabilistic Mass-Radius Relationship for Sub-Neptune-Sized Planets
• Determining stellar macroturbulence using asteroseismic rotational velocities from Kepler
• A new correction of stellar oscillation frequencies for near-surface effects
• Planetary Candidates from the First Year of the K2 Mission
• On the Anomalous Radii of the Transiting Extrasolar Planets
• The Hunt for Exomoons with Kepler (HEK): I. Description of a New Observational Project
• Low stellar obliquities in compact multiplanet systems
• Confirming chemical clocks: asteroseismic age dissection of the Milky Way disk(s)
• A nearby M star with three transiting super-Earths discovered by K2
• Remote Life Detection Criteria, Habitable Zone Boundaries, and the Frequency of Earthlike Planets around M and Late-K Stars
• Oscillation frequencies for 35 \Kepler solar-type planet-hosting stars using Bayesian techniques and machine learning
• A Catalog of Kepler Habitable Zone Exoplanet Candidates
• An in-depth study of grid-based asteroseismic analysis
• The Photoeccentric Effect and Proto-Hot Jupiters I. Measuring photometric eccentricities of individual transiting planets
• Determination of stellar radii from asteroseismic Data
• A new method to compute limb-darkening coefficients for stellar atmosphere models with spherical symmetry: the space missions TESS, Kepler, Corot, and MOST
• On the detectability of habitable exomoons with Kepler-class photometry
• Automated preparation of Kepler time series of planet hosts for asteroseismic analysis
• Towards stellar effective temperatures and diameters at one per cent accuracy for future surveys
• Eleven Multi-planet Systems from K2 Campaigns 1 & 2 and the Masses of Two Hot Super-Earths
• On the Frequency of Potential Venus Analogs from Kepler Data
• What asteroseismology can do for exoplanets: Kepler-410A b is a Small Neptune around a bright star, in an eccentric orbit consistent with low obliquity
• K2P${}^2$ $-$ A photometry pipeline for the K2 mission
• That's How We Roll: The NASA K2 Mission Science Products and Their Performance Metrics
• Pseudo-High-Order Symplectic Integrators
• Spin-orbit alignment of exoplanet systems: ensemble analysis using asteroseismology
• No Evidence for Lunar Transit in New Analysis of Hubble Space Telescope Observations of the Kepler-1625 System
• Effect of uncertainties in stellar model parameters on estimated masses and radii of single stars
• K2-97b: A (Re-?)Inflated Planet Orbiting a Red Giant Star
• Five Planets Transiting a Ninth Magnitude Star
• Why should we correct reported pulsation frequencies for stellar line-of-sight Doppler velocity shifts?
• Habitability of Exomoons at the Hill or Tidal Locking Radius
• Asteroseismic inference on the spin-orbit misalignment and stellar parameters of HAT-P-7
• Limits on surface gravities of Kepler planet-candidate host stars from non-detection of solar-like oscillations
• Solving the mode identification problem in asteroseismology of F stars observed with Kepler
• Impacts of stellar evolution and dynamics on the habitable zone: The role of rotation and magnetic activity
• Exploring Kepler Giant Planets in the Habitable Zone
• The Impact of Stellar Distances on Habitable Zone Planets
• The Curious Case of KOI 4: Confirming Kepler's First Exoplanet
• A Discrete Set of Possible Transit Ephemerides for Two Long Period Gas Giants Orbiting HIP 41378
• Asteroseismic properties of solar-type stars observed with the NASA K2 mission: results from Campaigns 1-3 and prospects for future observations
• Revisiting the HIP41378 system with K2 and Spitzer

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• The BAyesian STellar Algorithm (BASTA): a fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology
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• A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f
• Bioverse: a simulation framework to assess the statistical power of future biosignature surveys
• Oblique rings from migrating exomoons: A possible origin for long-period exoplanets with enlarged radii
• Testing Earth-like atmospheric evolution on exo-Earths through oxygen absorption: required sample sizes and the advantage of age-based target selection
• Rossiter-McLaughlin detection of the 9-month period transiting exoplanet HIP41378 d
• Multi-campaign Asteroseismic Analysis of eight Solar-like pulsating stars observed by the K2 mission
• Luminaries in the Sky: The TESS Legacy Sample of Bright Stars. I. Asteroseismic detections in naked-eye main-sequence and sub-giant solar-like oscillators
• The K2 Asteroseismic KEYSTONE sample of Dwarf and Subgiant Solar-Like Oscillators. I: Data and Asteroseismic parameters
• The star HIP 41378 potentially misaligned with its cohort of long-period planets
• HIP 41378 observed by CHEOPS: Where is planet d?
• Transit Timing Variations in HIP 41378: CHEOPS and TESS confirm a non-transiting sixth planet in the system
• The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission
• A Multi-Planet System's Sole Super-Puff: Exploring Allowable Physical Parameters for the Cold Super-Puff HIP 41378 f