The Swan: Data-Driven Inference of Stellar Surface Gravities for Cool Stars from Photometric Light Curves

Abstract

Stellar light curves are well known to encode physical stellar properties. Precise, automated and computationally inexpensive methods to derive physical parameters from light curves are needed to cope with the large influx of these data from space-based missions such as Kepler and TESS. Here we present a new methodology which we call The Swan, a fast, generalizable and effective approach for deriving stellar surface gravity ($\log g$) for main sequence, subgiant and red giant stars from Kepler light curves using local linear regression on the full frequency content of Kepler long cadence power spectra. With this inexpensive data-driven approach, we recover $\log g$ to a precision of $\sim$0.02 dex for 13,822 stars with seismic $\log g$ values between 0.2-4.4 dex, and $\sim$0.11 dex for 4,646 stars with Gaia derived $\log g$ values between 2.3-4.6 dex. We further develop a signal-to-noise metric and find that granulation is difficult to detect in many cool main sequence stars ($T_{\text{eff}}$ $\lesssim$ 5500 K), in particular K dwarfs. By combining our $\log g$ measurements with Gaia radii, we derive empirical masses for 4,646 subgiant and main sequence stars with a median precision of $\sim$7%. Finally, we demonstrate that our method can be used to recover $\log g$ to a similar mean absolute deviation precision for TESS-baseline of 27 days. Our methodology can be readily applied to photometric time-series observations to infer stellar surface gravities to high precision across evolutionary states.

arXiv comment21 pages, 14 figures, 4 tables. Accepted for publishing in the Astronomical Journal. The electronic versions of Tables 1, 3 and 4 are available as an ancillary file (sidebar on the right)

References in corpus (84)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• Gaia Data Release 2. Summary of the contents and survey properties
• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Gaia Data Release 2: The astrometric solution
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
• The PLATO 2.0 Mission
• Kepler Mission Design, Realized Photometric Performance, and Early Science
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Kepler Input Catalog: Photometric Calibration and Stellar Classification
• ASPCAP: The Apogee Stellar Parameter and Chemical Abundances Pipeline
• Giant Planet Occurrence in the Stellar Mass-Metallicity Plane
• Asteroseismology of Solar-Type and Red-Giant Stars
• The California Kepler Survey VII. Precise Planet Radii Leveraging Gaia DR2 Reveal the Stellar Mass Dependence of the Planet Radius Gap
• Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
• Measuring the rotation period distribution of field M-dwarfs with Kepler
• Planetary Candidates Observed by Kepler. VIII. A Fully Automated Catalog With Measured Completeness and Reliability Based on Data Release 25
• Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology
• Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data
• The Cannon: A data-driven approach to stellar label determination
• Asteroseismic fundamental properties of solar-type stars observed by the NASA Kepler Mission
• The GALAH Survey: Second Data Release
• The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
• Fundamental Properties of Kepler Planet-Candidate Host Stars using Asteroseismology
• Improved spectroscopic parameters for transiting planet hosts
• Revised Radii of Kepler Stars and Planets Using Gaia Data Release 2
• Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
• Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
• Asteroseismology of red giants from the first four months of Kepler data: Fundamental parameters
• Asteroseismic classification of stellar populations among 13000 red giants observed by Kepler
• Stellar Diameters and Temperatures III. Main Sequence A, F, G, & K Stars: Additional high-precision measurements and empirical relations
• Asteroseismology of 16000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii
• The relation between $\Delta \nu$ and ${\nu }_{max}$ for solar-like oscillations
• The underlying physical meaning of the ${\nu }_{\max }-{\nu }_{\mathrm{c}}$ relation
• The Payne: self-consistent ab initio fitting of stellar spectra
• Accurate parameters of 93 solar-type Kepler targets
• Spectroscopic determination of masses (and implied ages) for red giants
• Abundance Estimates for 16 Elements in 6 Million Stars from LAMOST DR5 Low-Resolution Spectra
• Deep learning of multi-element abundances from high-resolution spectroscopic data
• Granulation in Red Giants: observations by the Kepler mission and 3D convection simulations
• The Chemical Homogeneity of Sun-like Stars in the Solar Neighborhood
• Empirical, Accurate Masses and Radii of Single Stars with TESS and Gaia
• Giant star seismology
• {\em Gaia}-derived luminosities of {\em Kepler} A/F stars and the pulsator fraction across the δ Scuti instability strip
• Predicting the detectability of oscillations in solar-type stars observed by Kepler
• Amplitudes of solar-like oscillations: a new scaling relation
• An observational correlation between stellar brightness variations and surface gravity
• Impact on asteroseismic analyses of regular gaps in Kepler data
• Label Transfer from APOGEE to LAMOST: Precise Stellar Parameters for 450,000 LAMOST Giants
• An Application of Deep Neural Networks in the Analysis of Stellar Spectra
• Stroemgren survey for Asteroseismology and Galactic Archaeology: let the SAGA begin
• Global stellar variability study in the field-of-view of the Kepler satellite
• Deriving the stellar labels of LAMOST spectra with Stellar LAbel Machine (SLAM)
• Gap interpolation by inpainting methods : Application to Ground and Space-based Asteroseismic data
• Galactic Archaeology with asteroseismology and spectroscopy: Red giants observed by CoRoT and APOGEE
• Atmospheric parameters of 82 red giants in the Kepler field
• The RAVE-on catalog of stellar atmospheric parameters and chemical abundances for chemo-dynamic studies in the Gaia era
• The Asteroseismic Target List (ATL) for solar-like oscillators observed in 2-minute cadence with the Transiting Exoplanet Survey Satellite (TESS)
• Temperatures and Metallicities of M dwarfs in the APOGEE Survey
• Masses and Ages for 230,000 LAMOST Giants, via Their Carbon and Nitrogen Abundances
• Metallicity effect on stellar granulation detected from oscillating red giants in open clusters
• A Granulation "Flicker"-based Measure of Stellar Surface Gravity
• Measuring 14 elemental abundances with R=1,800 LAMOST spectra
• Probing the deep end of the Milky Way with \emph{Kepler}: Asteroseismic analysis of 854 faint Red Giants misclassified as Cool Dwarfs
• The Cannon 2: A data-driven model of stellar spectra for detailed chemical abundance analyses
• Kepler Eclipsing Binary Stars. VIII. Identification of False Positive Eclipsing Binaries and Re-extraction of New Light Curves
• A Search for Red Giant Solar-like Oscillations in All Kepler Data
• Abundances in the Milky Way across five nucleosynthetic channels from 4 million LAMOST stars
• Stellar Characterization of Keck HIRES Spectra with The Cannon
• FliPer: A global measure of power density to estimate surface gravities of main-sequence Solar-like stars and red giants
• The RAdial Velocity Experiment (RAVE): Parameterisation of RAVE spectra based on convolutional neural networks
• Surface gravities for 15,000 Kepler stars measured from stellar granulation and validated with Gaia DR2 parallaxes
• The age distribution of stars in the Milky Way bulge
• Predicting Granulation "Flicker" and Radial Velocity "Jitter" from Spectroscopic Observables
• Beyond Gaia: Asteroseismic Distances of M giants using Ground-Based Transient Surveys
• Inference of stellar parameters from brightness variations
• Data-Driven Spectroscopy of Cool Stars at High Spectral Resolution
• Fundamental Parameters of $\sim$30,000 M dwarfs in LAMOST DR1 Using Data-driven Spectral Modeling

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• The homogeneity of the star forming environment of the Milky Way disk over time
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• Astroconformer: The Prospects of Analyzing Stellar Light Curves with Transformer-Based Deep Learning Models
• A Homogeneous Catalog of Oscillating Solar-Type Stars Observed by the Kepler Mission and a New Amplitude Scaling Relation Including Chromospheric Activity
• A Refined Model of Convectively-Driven Flicker in Kepler Light Curves
• Elemental Abundances of Kepler Objects of Interest in APOGEE DR17
• FALCO: a Foundation model of Astronomical Light Curves for time dOmain astronomy
• Companions to Kepler giant stars: A long-period eccentric substellar companion to KIC 3526061 and a stellar companion to HD 187878