A. Gianninas
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The ELM Survey South. II. Two Dozen New Low-mass White Dwarf Binaries Open
We present the results from our ongoing spectroscopic survey targeting low-mass white dwarf binaries, focusing on the southern sky. We used a Gaia DR2- and eDR3-based selection and identified 28 new binaries, including 19 new extremely low…
The ELM Survey South. II. Two dozen new low mass white dwarf binaries Open
We present the results from our ongoing spectroscopic survey targeting low mass white dwarf binaries, focusing on the southern sky. We used a Gaia DR2 and eDR3 based selection and identified 28 new binaries, including 19 new extremely low …
The ELM Survey South II Open
Optical spectra for the 28 new white dwarf binaries and 287 other objects observed as part of the ELM Survey South II. The data is presented in FITS format with filenames based on the object's coordinates in epoch 2016.0: "HHMMSS[p/m]DDMMS…
The ELM Survey South II Open
Optical spectra for the 28 new white dwarf binaries and 287 other objects observed as part of the ELM Survey South II. The data is presented in FITS format with filenames based on the object's coordinates in epoch 2016.0: "HHMMSS[p/m]DDMMS…
The ELM Survey. IX. A Complete Sample of Low-mass White Dwarf Binaries in the SDSS Footprint Open
We present the discovery of 17 double white dwarf (WD) binaries from our ongoing search for extremely low mass (ELM) < 0.3 M ⊙ WDs, objects that form from binary evolution. Gaia parallax provides a new means of target selection that we use…
View article: Insights into internal effects of common-envelope evolution using the extended Kepler mission
Insights into internal effects of common-envelope evolution using the extended Kepler mission Open
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 of the extended
The ELM Survey South I Open
Fits data files for white dwarf systems published in The ELM Survey South I.
The ELM Survey South I Open
Fits data files for white dwarf systems published in The ELM Survey South I.
The ELM Survey South I Open
Fits data files for white dwarf systems published in The ELM Survey South I.
GALEX absolute calibration and extinction coefficients based on white dwarfs Open
We use 1837 DA white dwarfs with high signal-to-noise ratio spectra and Gaia parallaxes to verify the absolute calibration and extinction coefficients for the Galaxy Evolution Explorer (GALEX). We use white dwarfs within 100 pc to verify t…
The DECam minute cadence survey – II. 49 variables but no planetary transits of a white dwarf Open
We present minute cadence photometry of 31 732 point sources observed in one 3 $\rm deg^{2}$ DECam pointing centred at RA = 09:03:02 and Dec. = −04:35:00 over eight consecutive half-nights. We use these data to search for eclipse-like even…
A refined search for pulsations in white dwarf companions to millisecond pulsars★ Open
We present optical high-speed photometry of three millisecond pulsars with\nlow-mass ($< 0.3 M_{\\odot}$) white dwarf companions, bringing the total number\nof such systems with follow-up time-series photometry to five. We confirm the\ndet…
A Serendipitous Pulsar Discovery in a Search for a Companion to a Low-mass White Dwarf Open
We report the discovery of a previously unidentified pulsar as part of a radio campaign to identify neutron star companions to low-mass white dwarfs (LMWDs) using the Robert C.\ Byrd Green Bank Telescope (GBT). PSR J0802-0955, which is coi…
Discovery of a Detached, Eclipsing 40 Minute Period Double White Dwarf Binary and a Friend: Implications for He+CO White Dwarf Mergers<sup>*</sup> Open
We report the discovery of two detached double white dwarf (WD) binaries, SDSS J082239.546+304857.19 and SDSS J104336.275+055149.90, with orbital periods of 40 and 46 minutes, respectively. The 40 minute system is eclipsing; it is composed…
A Gemini snapshot survey for double degenerates Open
We present the results from a Gemini snapshot radial-velocity survey of 44\nlow-mass white dwarf candidates selected from the Sloan Digital Sky Survey\nspectroscopy. To find sub-hour orbital period binary systems, our time-series\nspectros…
View article: Project 1640 observations of the white dwarf HD 114174 B
Project 1640 observations of the white dwarf HD 114174 B Open
We present the first near infrared spectrum of the faint white dwarf companion HD 114174 B, obtained with Project 1640. Our spectrum, covering the Y, J and H bands, combined with previous TaRgetting bENchmark-objects with Doppler Spectrosc…
Four new massive pulsating white dwarfs including an ultramassive DAV Open
We report the discovery of four massive ($M > 0.8\\,M_\\odot$) ZZ Ceti white\ndwarfs, including an ultramassive $1.16\\,M_\\odot$ star. We obtained ground\nbased, time-series photometry for thirteen white dwarfs from the Sloan Digital\nSky…
View article: Pruning The ELM Survey: Characterizing Candidate Low-mass White Dwarfs through Photometric Variability
Pruning The ELM Survey: Characterizing Candidate Low-mass White Dwarfs through Photometric Variability Open
We assess the photometric variability of nine stars with spectroscopic T eff and log g values from the ELM Survey that locates them near the empirical extremely low-mass (ELM) white dwarf instability strip. We discover three new pulsating …
View article: A DEEP PROPER MOTION CATALOG WITHIN THE SLOAN DIGITAL SKY SURVEY FOOTPRINT. II. THE WHITE DWARF LUMINOSITY FUNCTION
A DEEP PROPER MOTION CATALOG WITHIN THE SLOAN DIGITAL SKY SURVEY FOOTPRINT. II. THE WHITE DWARF LUMINOSITY FUNCTION Open
A catalog of 8472 white dwarf (WD) candidates is presented, selected using reduced proper motions from the deep proper motion catalog of Munn et al. Candidates are selected in the magnitude range over 980 square degrees, and over an additi…
Asteroseismic test of rotational mixing in low-mass white dwarfs Open
\n We exploit the recent discovery of pulsations in mixed-atmosphere (He/H), extremely low-mass white dwarf precursors (ELM proto-WDs) to test the proposition that rotational mixing is a fundamental process in the formation and evolution o…
View article: New halo white dwarf candidates in the Sloan Digital Sky Survey
New halo white dwarf candidates in the Sloan Digital Sky Survey Open
We present optical spectroscopy and near-infrared photometry of 57 faint (g = 19–22) high proper motion white dwarfs identified through repeat imaging of ≈3100 deg2 of the Sloan Digital Sky Survey footprint by Munn et al. We use ugriz and …
View article: The DECam minute cadence survey – I
The DECam minute cadence survey – I Open
We present the first results from a minute cadence survey of a 3 deg2 field obtained with the Dark Energy Camera. We imaged part of the Canada–France–Hawaii Telescope Legacy Survey area over eight half-nights. We use the stacked images to …
Massive double white dwarfs and the AM CVn birthrate Open
We present Chandra and Swift X-ray observations of four extremely low-mass (ELM) white dwarfs with massive companions. We place stringent limits on X-ray emission from all four systems, indicating that neutron star companions are extremely…
DISCOVERY OF THREE PULSATING, MIXED-ATMOSPHERE, EXTREMELY LOW-MASS WHITE DWARF PRECURSORS* Open
We report the discovery of pulsations in three mixed-atmosphere, extremely low-mass white dwarf (ELM WD, M 0.3 M ⊙ ) precursors. Following the recent discoveries of pulsations in both ELM and pre-ELM WDs, we targeted pre-ELM WDs with mixed…
Remnant planetary systems around bright white dwarfs Open
We cross-correlate several sources of archival photometry for 1265 bright (V ∼ 16 mag) white dwarfs (WDs) with available high signal-to-noise spectroscopy. We find 381 WDs with archival Spitzer+IRAC data and investigate this subsample for …
SDSS J1152+0248: an eclipsing double white dwarf from the<i>Kepler</i><i>K2</i>campaign Open
We report the discovery of the sixth known eclipsing double white dwarf (WD) system, SDSS J1152+0248, with a 2.3968 ± 0.0003 h orbital period, in data from the Kepler Mission's K2 continuation. Analysing and modelling the K2 data together …
THE ELM SURVEY. VII. ORBITAL PROPERTIES OF LOW-MASS WHITE DWARF BINARIES* Open
We present the discovery of 15 extremely low-mass ( ) white dwarf (WD) candidates, 9 of which are in ultra-compact double-degenerate binaries. Our targeted extremely low-mass Survey sample now includes 76 binaries. The sample has a lognorm…