The K2 Galactic Archaeology Program Data Release 1: Asteroseismic results from Campaign 1

Abstract

NASA's K2 mission is observing tens of thousands of stars along the ecliptic, providing data suitable for large scale asteroseismic analyses to inform galactic archaeology studies. Its first campaign covered a field near the north galactic cap, a region never covered before by large asteroseismic-ensemble investigations, and was therefore of particular interest for exploring this part of our Galaxy. Here we report the asteroseismic analysis of all stars selected by the K2 Galactic Archaeology Program during the mission's "North Galactic Cap" campaign 1. Our consolidated analysis uses six independent methods to measure the global seismic properties, in particular the large frequency separation, and the frequency of maximum power. From the full target sample of 8630 stars we find about 1200 oscillating red giants, a number comparable with estimates from galactic synthesis modeling. Thus, as a valuable by-product we find roughly 7500 stars to be dwarfs, which provide a sample well suited for galactic exoplanet occurrence studies because they originate from our simple and easily reproducible selection function. In addition, to facilitate the full potential of the data set for galactic archaeology we assess the detection completeness of our sample of oscillating red giants. We find the sample is at least near complete for stars with 40 < numax/microHz < 270, and numax_detec < 2.6*1e6 * 2e-Kp microHz. There is a detection bias against helium core burning stars with numax ~ 30 microHz, affecting the number of measurements of DeltaNu and possibly also numax. Although we can detect oscillations down to Kp = 15, our campaign 1 sample lacks enough faint giants to assess the detection completeness for stars fainter than Kp ~ 14.5.

Accepted by ApJ. 18 pages, 20 figures, 4 tables (tables 3 and 4 are available at http://www.physics.usyd.edu.au/k2gap/)

References in corpus (38)

• The K2 Mission: Characterization and Early results
• The GALAH Survey: Scientific Motivation
• Overview of the Kepler Science Processing Pipeline
• Star counts in the Galaxy. Simulating from very deep to very shallow photometric surveys with the TRILEGAL code
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• Asteroseismology of Solar-Type and Red-Giant Stars
• Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
• Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data
• Target Selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Terrestrial Planet Occurrence Rates for the Kepler GK Dwarf Sample
• Asteroseismology of old open clusters with Kepler: direct estimate of the integrated RGB mass loss in NGC6791 and NGC6819
• The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
• Galaxia: a code to generate a synthetic survey of the Milky Way
• Ensemble Asteroseismology of Solar-Type Stars with the NASA Kepler Mission
• The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8
• The connection between stellar granulation and oscillation as seen by the Kepler mission
• 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
• Determining global parameters of the oscillations of solar-like stars
• The relation between $\Delta \nu$ and ${\nu }_{max}$ for solar-like oscillations
• Red-giant seismic properties analyzed with CoRoT
• Characterization of the power excess of solar-like oscillations in red giants with Kepler
• On detecting the large separation in the autocorrelation of stellar oscillation times series
• Stellar population synthesis based modelling of the Milky Way using asteroseismology of 13000 Kepler red giants
• Asteroseismology of red giants from the first four months of Kepler data: Global oscillation parameters for 800 stars
• Granulation in Red Giants: observations by the Kepler mission and 3D convection simulations
• Characteristics of solar-like oscillations in red giants observed in the CoRoT exoplanet field
• The Octave (Birmingham - Sheffield Hallam) automated pipeline for extracting oscillation parameters of solar-like main-sequence stars
• Solar-like oscillations in red giants observed with Kepler: comparison of global oscillation parameters from different methods
• Characterisation of red-giant stars in the public Kepler data
• Oscillating red giants observed during Campaign 1 of the Kepler K2 mission: New prospects for galactic archaeology
• Characterizing K2 Planet Discoveries: A super-Earth transiting the bright K-dwarf HIP 116454
• The K2 M67 Study: Revisiting old friends with K2 reveals oscillating red giants in the open cluster M67
• Amplitudes of solar-like oscillations: constraints from red giants in open clusters observed by Kepler
• Multisite campaign on the open cluster M67. II. Evidence for solar-like oscillations in red giant stars
• Solar-like oscillations in red giants observed with \textit{Kepler}: influence of increased timespan on global oscillation parameters
• Suppression of quadrupole and octupole modes in red giants observed by Kepler
• Probing the deep end of the Milky Way with \emph{Kepler}: Asteroseismic analysis of 854 faint Red Giants misclassified as Cool Dwarfs

Cited by in corpus (64)

• The GALAH+ Survey: Third Data Release
• The GALAH Survey: Second Data Release
• Probing the interior physics of stars through asteroseismology
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
• Accuracy and precision of industrial stellar abundances
• The TESS-HERMES survey Data Release 1: high-resolution spectroscopy of the TESS southern continuous viewing zone
• The First APOKASC Catalog of Kepler Dwarf and Subgiant Stars
• Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
• Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey
• A Hot Saturn Orbiting An Oscillating Late Subgiant Discovered by TESS
• Period spacings in red giants IV: Toward a complete description of the mixed-mode pattern
• The K2-HERMES Survey: Age and Metallicity of the Thick Disc
• Deep Learning Classification in Asteroseismology Using an Improved Neural Network: Results on 15000 Kepler Red Giants and Applications to K2 and TESS Data
• Aurigaia: mock Gaia DR2 stellar catalogues from the Auriga cosmological simulations
• Mapping the Galactic Metallicity Gradient with Open Clusters: The State-of-the-Art and Future Challenges
• A 20-Second Cadence View of Solar-Type Stars and Their Planets with TESS: Asteroseismology of Solar Analogs and a Re-characterization of pi Men c
• New light on the Gaia DR2 parallax zero-point: influence of the asteroseismic approach, in and beyond the Kepler field
• Giant planet occurrence within 0.2 AU of low-luminosity red giant branch stars with K2
• Detection and characterisation of oscillating red giants: first results from the TESS satellite
• Mass and Age of Red Giant Branch Stars Observed with LAMOST and \emph{Kepler}
• The GALAH survey: A census of lithium-rich giant stars
• The GALAH survey: Chemical Tagging of Star Clusters and New Members in the Pleiades
• The K2 Galactic Archaeology Program Data Release 3: Age-abundance patterns in C1-C8 and C10-C18
• The K2-HERMES Survey. I. Planet Candidate Properties from K2 Campaigns 1-3
• A Search for Red Giant Solar-like Oscillations in All Kepler Data
• The GALAH survey: properties of the Galactic disk(s) in the solar neighbourhood
• TESS asteroseismology of the Kepler red giants
• Nonlinear seismic scaling relations
• Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample VII: the Stellar Disk Structure Revealed by the Mono-abundance Populations
• Detecting Solar-like Oscillations in Red Giants with Deep Learning
• Integrated Mass Loss of Evolved Stars in M4 using Asteroseismology
• CAPOS: The bulge Cluster APOgee Survey I. Overview and initial ASPCAP results
• A Catalogue of Solar-Like Oscillators Observed by TESS in 120-second and 20-second Cadence
• The K2 Galactic Caps Project -- Going Beyond the \textit{Kepler} Field and Ageing the Galactic Disc
• Age-Dating Red Giant Stars Associated with Galactic Disk and Halo Substructures
• The K2 Galactic Archaeology Program Data Release 2: Asteroseismic results from campaigns 4, 6, & 7
• Age Determination of Galaxy Merger Remnant Stars using Asteroseismology
• Seismic performance
• The Random Transiter -- EPIC 249706694/HD 139139
• An Intermediate-age Alpha-rich Galactic Population in K2
• The APO-K2 Catalog. II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way
• HD-TESS: An Asteroseismic Catalog of Bright Red Giants within TESS Continuous Viewing Zones
• The GALAH survey: Co-orbiting stars and chemical tagging
• Inference of stellar parameters from brightness variations
• A Unified Exploration of the Chronology of the Galaxy
• The Bayesian Asteroseismology data Modeling pipeline and its application to $K2$ data
• Multi-campaign Asteroseismic Analysis of eight Solar-like pulsating stars observed by the K2 mission
• The effect of the adiabatic assumption on asteroseismic scaling relations for luminous red giants
• Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE - Constellation
• Modeling Asteroseismic Yields for the Roman Galactic Bulge Time-Domain Survey
• Vetting Asteroseismic $\Delta \nu$ Measurements using Neural Networks
• K2-HERMES II. Planet-candidate properties from K2 Campaigns 1-13
• A study of Pulsation & Rotation in a sample of A-K type stars in the Kepler field
• The GALAH Survey: Dependence of elemental abundances on age and metallicity for stars in the Galactic disc
• A probabilistic method for detecting solar-like oscillations using meaningful prior information
• A catalogue of asteroseismically calibrated ages for APOGEE DR17. The predictions of a CatBoost machine learning model based on the [Mg/Ce] chemical clock and other stellar parameters
• The GALAH survey: Multiple stars and our Galaxy. I. A comprehensive method for deriving properties of FGK binary stars
• Mode Angular Degree Identification in Subgiant Stars with Convolutional Neural Networks based on Power Spectrum
• CN and CO Features: Key Indicators of Red Giant Evolutionary Phase in Moderate-Resolution X-Shooter Spectra
• CAPOS: The bulge Cluster APOgee Survey VIII. Final ASPCAP results for all clusters
• The K2 Galactic Archaeology Program: Overview, target selection and survey properties
• Beyond the Nyquist frequency: Asteroseismic catalog of undersampled Kepler late subgiants and early red giants
• Asteroseismology of red giants & galactic archaeology
• A 'Quick Look' at All-Sky Galactic Archeology with TESS: 158,000 Oscillating Red Giants from the MIT Quick-Look Pipeline