Discovery of pulsations, including possible pressure modes, in two new extremely low mass, He-core white dwarfs
@article{Hermes2012DiscoveryOP, title={Discovery of pulsations, including possible pressure modes, in two new extremely low mass, He-core white dwarfs}, author={J. J. Hermes and Michael H. Montgomery and Don E. Winget and Warren R. Brown and Alexandros Gianninas and Mukremin Kilic and Scott J. Kenyon and Keaton J. Bell and Samuel Thomas Harrold}, journal={arXiv: Solar and Stellar Astrophysics}, year={2012} }
We report the discovery of the second and third pulsating extremely low mass white dwarfs (WDs), SDSS J111215.82+111745.0 (hereafter J1112) and SDSS J151826.68+065813.2 (hereafter J1518). Both have masses < 0.25 Msun and effective temperatures below 10,000 K, establishing these putatively He-core WDs as a cooler class of pulsating hydrogen-atmosphere WDs (DAVs, or ZZ Ceti stars). The short-period pulsations evidenced in the light curve of J1112 may also represent the first observation of…
Figures and Tables from this paper
56 Citations
A new class of pulsating white dwarf of extremely low mass: The fourth and fifth members
- Physics
- 2013
We report the discovery of two new pulsating extremely low-mass (ELM) white dwarfs (WDs), SDSS J161431.28+191219.4 (hereafter J1614) and SDSS J222859.93+362359.6 (hereafter J2228). Both WDs have…
Discovery of Three Pulsating, Mixed-atmosphere, Extremely Low-mass White Dwarf Precursors
- Physics
- 2016
We report the discovery of pulsations in three mixed-atmosphere, extremely low-mass white dwarf (ELM WD, M $\leqslant$ 0.3 M$_{\odot}$) precursors. Following the recent discoveries of pulsations in…
Two new pulsating low-mass pre-white dwarfs or SX Phoenicis stars?
- Physics, Geology
- 2016
Context. The discovery of pulsations in low-mass stars opens an opportunity to probe their interiors and determine their evolution by employing the tools of asteroseismology. Aims. We aim to analyse…
PSR J1738+0333: the first millisecond pulsar + pulsating white dwarf binary.
- Physics
- 2015
We report the discovery of the first millisecond pulsar with a pulsating white dwarf companion. Following the recent discoveries of pulsations in extremely low-mass (ELM, <0.3 Msol) white dwarfs…
Pulsating low-mass white dwarfs in the frame of new evolutionary sequences
- Physics, GeologyAstronomy & Astrophysics
- 2018
Context. Some low-mass white-dwarf (WD) stars with H atmospheres currently being detected in our galaxy, show long-period g(gravity)-mode pulsations, and comprise the class of pulsating WDs called…
A refined search for pulsations in white dwarf companions to millisecond pulsars★
- Physics, GeologyMonthly Notices of the Royal Astronomical Society
- 2018
We present optical high-speed photometry of three millisecond pulsars with low-mass ($< 0.3 M_{\odot}$) white dwarf companions, bringing the total number of such systems with follow-up time-series…
Insights into internal effects of common-envelope evolution using the extended Kepler mission
- Physics, Geology
- 2015
We present an analysis of the binary and physical parameters of a unique pulsating white dwarf with a main-sequence companion, SDSS J1136+0409, observed for more than 77 d during the first pointing…
Pulsating low-mass white dwarfs in the frame of new evolutionary sequences: III. The pre-ELM white dwarf instability strip
- Physics
- 2016
Two low-mass pre-white dwarfs, which could be precursors of ELM white dwarfs, have been observed to show multiperiodic photometric variations. They could constitute a new class of pulsating low-mass…
Pruning The ELM Survey: Characterizing Candidate Low-mass White Dwarfs through Photometric Variability
- Physics, Geology
- 2016
We assess the photometric variability of nine stars with spectroscopic Teff and log(g) values from the ELM Survey that locate them near the empirical extremely low-mass (ELM) white dwarf instability…
Multi-period g-mode Pulsations of a Pre-He-WD Star in the Eclipsing Binary KIC 9164561
- Physics
- 2016
We report the discovery of a new pulsating pre-He-WD in the EL CVn-type binary KIC 9164561. Light curve modeling and frequency analysis of the binary system were carried out based on short-cadence…
References
SHOWING 1-10 OF 41 REFERENCES
SDSS J184037.78+642312.3: The First Pulsating Extremely Low Mass White Dwarf
- Physics
- 2012
We report the discovery of the first pulsating extremely low mass (ELM) white dwarf (WD), SDSS J184037.78+642312.3 (hereafter J1840). This DA (hydrogen-atmosphere) WD is by far the coolest and the…
The Newly Discovered Pulsating Low-mass White Dwarfs: An Extension of the ZZ Ceti Instability Strip
- Physics
- 2013
In light of the exciting discovery of g-mode pulsations in extremely low-mass, He-core DA white dwarfs, we report on the results of a detailed stability survey aimed at explaining the existence of…
The Pulsating White Dwarf Stars
- Physics
- 2008
We present a summary of what is currently known about the three distinct families of isolated pulsating white dwarfs. These are the GW Vir stars (He/C/O-atmosphere stars with Teff 120,000 K), the…
THE ELM SURVEY. I. A COMPLETE SAMPLE OF EXTREMELY LOW-MASS WHITE DWARFS*
- Physics
- 2010
We analyze radial velocity observations of the 12 extremely low-mass (ELM), with {<=}0.25 M{sub sun}, white dwarfs (WDs) in the MMT Hypervelocity Star Survey. Eleven of the twelve WDs are binaries…
The seismic properties of low-mass He-core white dwarf stars
- Physics, Geology
- 2012
Context. In recent years, many low-mass (0.45 M� ) white dwarf stars expected to harbor He cores have been detected in the field of the Milky Way and in several galactic globular and open clusters.…
A SEARCH FOR PULSATIONS IN HELIUM WHITE DWARFS
- Physics, Geology
- 2012
The recent plethora of sky surveys, especially the Sloan Digital Sky Survey, have discovered many low-mass (M < 0.45 M_⊙) white dwarfs that should have cores made of nearly pure helium. These WDs…
The Elm Survey. II. Twelve Binary White Dwarf Merger Systems
- Physics
- 2011
We describe new radial velocity and X-ray observations of extremely low-mass white dwarfs (ELM WDs, {approx}0.2 M{sub sun}) in the Sloan Digital Sky Survey Data Release 4 and the MMT Hypervelocity…
THE ELM SURVEY. III. A SUCCESSFUL TARGETED SURVEY FOR EXTREMELY LOW MASS WHITE DWARFS
- Physics
- 2012
Extremely low mass (ELM) white dwarfs (WDs) with masses < 0.25 M{sub Sun} are rare objects that result from compact binary evolution. Here, we present a targeted spectroscopic survey of ELM WD…
Evidence for Temperature Change and Oblique Pulsation from Light Curve Fits of the Pulsating White Dwarf GD 358
- Physics
- 2010
Convective driving, the mechanism originally proposed by Brickhill for pulsating white dwarf stars, has gained general acceptance as the generic linear instability mechanism in DAV and DBV white…
High-Speed Hubble Space Telescope Ultraviolet photometry of two DB white dwarfs: Nonradial and radial pulsations
- Physics
- 1994
We observed two DB white dwarf stars with the High Speed Photometer aboard the Hubble Space Telescope. The two targets, the nonradial pulsator GD 358, and PG 0112+104, a non-pulsating white dwarf…