Outbursts in two new cool pulsating DA white dwarfs
arXiv:1607.01392 · doi:10.3847/0004-637X/829/2/82
Abstract
The unprecedented extent of coverage provided by Kepler observations recently revealed outbursts in two hydrogen-atmosphere pulsating white dwarfs (DAVs) that cause hours-long increases in the overall mean flux of up to 14%. We have identified two new outbursting pulsating white dwarfs in K2, bringing the total number of known outbursting white dwarfs to four. EPIC 211629697, with T_eff = 10,780 +/- 140 K and log(g) = 7.94 +/- 0.08, shows outbursts recurring on average every 5.0 d, increasing the overall flux by up to 15%. EPIC 229227292, with T_eff = 11,190 +/- 170 K and log(g) = 8.02 +/- 0.05, has outbursts that recur roughly every 2.4 d with amplitudes up to 9%. We establish that only the coolest pulsating white dwarfs within a small temperature range near the cool, red edge of the DAV instability strip exhibit these outbursts.
arXiv comment11 pages, 9 figures, accepted for publication in ApJ
References in corpus (30)
- The K2 Mission: Characterization and Early results
- A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
- A disintegrating minor planet transiting a white dwarf
- An Improved Spectroscopic Analysis of DA White Dwarfs from the Sloan Digital Sky Survey Data Release 4
- SDSS DR7 White Dwarf Catalog
- Evolutionary and pulsational properties of white dwarf stars
- Pulsating White Dwarf Stars and Precision Asteroseismology
- Spectroscopic Analysis of DA White Dwarfs: Stark Broadening of Hydrogen Lines Including Non-Ideal Effects
- A Spectroscopic Survey & Analysis of Bright, Hydrogen-Rich White Dwarfs
- Initial Characteristics of Kepler Short Cadence Data
- Spectroscopic analysis of DA white dwarfs with 3D model atmospheres
- High-resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia Progenitor Survey. III. DA white dwarfs
- Gravity-Modes in ZZ Ceti Stars: I.Quasiadiabatic Analysis of Overstability
- On the Purity of the ZZ Ceti Instability Strip: Discovery of More Pulsating DA White Dwarfs on the Basis of Optical Spectroscopy
- A detection threshold in the amplitude spectra calculated from Kepler data obtained during K2 mission
- The Ratio of Helium- to Hydrogen-Atmosphere White Dwarfs: Direct Evidence for Convective Mixing
- Gravity-Modes in ZZ Ceti Stars: IV. Amplitude Saturation by Parametric Instability
- Towards an Empirical Determination of the ZZ Ceti Instability Strip
- Ensemble Characteristics of the ZZ Ceti stars
- A new class of pulsating white dwarf of extremely low mass: the fourth and fifth members
- 3D Model Atmospheres for Extremely Low-Mass White Dwarfs
- K2 Variable Catalogue: Variable Stars and Eclipsing Binaries in K2 Campaigns 1 and 0
- Spectroscopic Identification of Cool White Dwarfs in the Solar Neighbourhood
- KIC 4552982: Outbursts and Asteroseismology from the Longest Pseudo-Continuous Light Curve of a ZZ Ceti
- A second case of outbursts in a pulsating white dwarf observed by Kepler
- Precision asteroseismology of the pulsating white dwarf GD 1212 using a two-wheel-controlled Kepler spacecraft
- Evidence for Temperature Change and Oblique Pulsation from Light Curve Fits of the Pulsating White Dwarf GD 358
- Discovery of a ZZ Ceti in the Kepler Mission Field
- Gravity-modes in ZZ Ceti Stars. II. Effects of Turbulent Dissipation
- The search for ZZ Ceti stars in the original Kepler mission
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- Pulsating white dwarfs: new insights
- White Dwarf Rotation as a Function of Mass and a Dichotomy of Mode Linewidths: Kepler Observations of 27 Pulsating DA White Dwarfs Through K2 Campaign 8
- I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility
- When flux standards go wild: white dwarfs in the age of Kepler
- TESS first look at evolved compact pulsators: Known ZZ Ceti stars of the southern ecliptic hemisphere as seen by TESS
- Multi-band photometry and spectroscopy of an all-sky sample of bright white dwarfs
- Destroying Aliases from the Ground and Space: Super-Nyquist ZZ Cetis in K2 Long Cadence Data
- Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73-033933.0
- DAVs: Red edge and Outbursts
- Pulsating White Dwarfs
- Flares hunting in hot subdwarf and white dwarf stars from Cycles 1-5 of TESS photometry
- A catalogue of white dwarf candidates in VST ATLAS
- Spectroscopic survey of faint planetary-nebula nuclei. I. Six new "O VI" central stars
- ZZ Ceti stars of the southern ecliptic hemisphere re-observed by TESS
- Wandering near the red edge: photometric observations of three cool ZZ Ceti stars
- White Dwarf Variability with gPhoton: Pulsators
- An observer's view on the future of asteroseismology
- Seismic test of the mass-radius relationship of hydrogen-atmospheric white dwarf stars
- White-dwarf asteroseismology: an update
- Asteroseismology of the ZZ Ceti star WD 1310+583 using the Transiting Exoplanet Survey Satellite