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121 papers
Signs of Binary Evolution in 7 Magnetic DA White Dwarfs
Adam Moss, Mukremin Kilic, P. Bergeron +2
We present our findings on the spectral analysis of seven magnetic white dwarfs that were presumed to be double degenerates. We obtained time-resolved spectroscopy at the Gemini Ob…
The ELM Survey South. II. Two dozen new low mass white dwarf binaries
Alekzander Kosakowski, Warren R. Brown, Mukremin Kilic +5
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…
The Merger Fraction of Ultramassive White Dwarfs
Mukremin Kilic, Adam G. Moss, Alekzander Kosakowski +6
We search for merger products among the 25 most massive white dwarfs in the Montreal White Dwarf Database 100 pc sample through follow-up spectroscopy and high-cadence photometry.…
A dense star in a 51-minute orbital period eclipsing binary
Kevin B. Burdge, Kareem El-Badry, Thomas R. Marsh +24
In over a thousand known cataclysmic variables (CVs), where a white dwarf is accreting from a hydrogen-rich star, only a dozen have orbital periods below 75 minutes. One way to ach…
The ELM Survey. IX. A Complete Sample of Low Mass White Dwarf Binaries in the SDSS Footprint
Warren R. Brown, Mukremin Kilic, Alekzander Kosakowski +1
We present the discovery of 17 double white dwarf (WD) binaries from our on-going search for extremely low mass (ELM) <0.3 Msun WDs, objects that form from binary evolution. Gaia p…
On the Nature of Ultracool White Dwarfs: Not so Cool Afterall
P. Bergeron, Mukremin Kilic, Simon Blouin +3
A recent analysis of the 100 pc white dwarf sample in the SDSS footprint demonstrated for the first time the existence of a well defined ultracool -- or IR-faint -- white dwarf seq…