48 citations · 325 across the 15 of their papers we have counts for
14 papers · 1 filter
A super-Chandrasekhar mass type Ia supernova progenitor at 49 pc set to detonate in 23 Gyr
James Munday, Ruediger Pakmor, Ingrid Pelisoli +9
Double white dwarf binaries are a leading explanation to the origin of type Ia supernovae, but no system exceeding the Chandrasekhar mass limit (1.4 M) has been found that…
The 100 pc White Dwarf Sample in the SDSS Footprint II. A New Look at the Spectral Evolution of White Dwarfs
Mukremin Kilic, Pierre Bergeron, Simon Blouin +5
We increase the spectroscopic completeness of the 100 pc white dwarf sample in the SDSS footprint with 840 additional spectra. Our spectroscopy is 86% complete for white dwarfs hot…
Buoyant crystals halt the cooling of white dwarf stars
Antoine Bédard, Simon Blouin, Sihao Cheng
White dwarfs are stellar remnants devoid of a nuclear energy source, gradually cooling over billions of years and eventually freezing into a solid state from the inside out. Recent…
The spectral evolution of white dwarfs: where do we stand?
Antoine Bédard
White dwarfs are the dense, burnt-out remnants of the vast majority of stars, condemned to cool over billions of years as they steadily radiate away their residual thermal energy.…
An emerging and enigmatic spectral class of isolated DAe white dwarfs
Abbigail K. Elms, Pier-Emmanuel Tremblay, Boris T. Gänsicke +9
Two recently discovered white dwarfs, WDJ041246.84754942.26 and WDJ165335.21100116.33, exhibit H and H Balmer line emission similar to stars in the emerging DAHe class,…
The ubiquity of carbon dredge-up in hydrogen-deficient white dwarfs as revealed by GALEX
Simon Blouin, Mukremin Kilic, Antoine Bédard +1
The convective dredge-up of carbon from the interiors of hydrogen-deficient white dwarfs has long been invoked to explain the presence of carbon absorption features in the spectra…
On the Spectral Evolution of Hot White Dwarf Stars. III. The PG 1159DODBDQ Evolutionary Channel Revisited
A. Bédard, P. Bergeron, P. Brassard
We continue our comprehensive theoretical investigation of the spectral evolution of white dwarfs based on sophisticated simulations of element transport. In this paper, we focus o…
On the Spectral Evolution of Hot White Dwarf Stars. II. Time-dependent Simulations of Element Transport in Evolving White Dwarfs with STELUM
A. Bédard, P. Brassard, P. Bergeron +1
White dwarf stars are subject to various element transport mechanisms that can cause their surface composition to change radically as they cool, a phenomenon known as spectral evol…
Hot Degenerates in the MCT Survey. III. A Sample of White Dwarf Stars in the Southern Hemisphere
P. Bergeron, F. Wesemael, G. Fontaine +7
We present optical spectra of 144 white dwarfs detected in the Montreal-Cambridge-Tololo (MCT) colorimetric survey, including 120 DA, 12 DB, 4 DO, 1 DQ, and 7 DC stars. We also per…
The Discovery of Two LISA Sources within 0.5 kpc
Mukremin Kilic, Warren R. Brown, A. Bedard +1
We report the discovery of the brightest detached binary white dwarfs with periods less than an hour, which provide two new gravitational wave verification binaries for the Laser I…
The Most Massive White Dwarfs in the Solar Neighborhood
Mukremin Kilic, P. Bergeron, Simon Blouin +1
We present an analysis of the most massive white dwarf candidates in the Montreal White Dwarf Database 100 pc sample. We identify 25 objects that would be more massive than $1.3~M_…
Hidden in Plain Sight: A Double-lined White Dwarf Binary 26 pc Away and a Distant Cousin
Mukremin Kilic, A. Bedard, P. Bergeron
We present high-resolution spectroscopy of two nearby white dwarfs with inconsistent spectroscopic and parallax distances. The first one, PG 1632+177, is a 13th magnitude white dwa…
A 1201 s Orbital Period Detached Binary: the First Double Helium Core White Dwarf LISA Verification Binary
Warren R. Brown, Mukremin Kilic, A. Bedard +2
We report the discovery of a 1201 s orbital period binary, the third shortest-period detached binary known. SDSS J232230.20+050942.06 contains two He-core white dwarfs orbiting wit…
Two new Double-lined Spectroscopic Binary White Dwarfs
Mukremin Kilic, A. Bedard, P. Bergeron +1
We present radial velocity observations of four binary white dwarf candidates identified through their over-luminosity. We identify two new double-lined spectroscopic binary system…