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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.…
white dwarfs within 40 pc III: spectroscopic observations of new candidates in the southern hemisphere
Mairi W. O'Brien, P. -E. Tremblay, N. P. Gentile Fusillo +31
We present a spectroscopic survey of 248 white dwarf candidates within 40 pc of the Sun; of these 244 are in the southern hemisphere. Observations were performed mostly with the Ve…
Local stellar formation history from the 40 pc white dwarf sample
E. Cukanovaite, P. -E. Tremblay, S. Toonen +4
We derive the local stellar formation history from the Gaia-defined 40 pc white dwarf sample. This is currently the largest volume-complete sample of white dwarfs for which spectro…
The origins of Calcium-rich supernovae from disruptions of CO white-dwarfs by hybrid He-CO white-dwarfs
Yossef Zenati, Hagai B. Perets, Luc Dessart +3
Calcium-rich (SN 2005E-like) explosions are very faint (typical -15.5, type I supernovae (SNe) showing strong Ca-lines, mostly observed in old stellar environments. Several models…
Von Zeipel - Lidov - Kozai cycles in action: triples with eclipse depth variations: KICs 6964043, 5653126, 5731312 and 8023317
T. Borkovits, S. A. Rappaport, S. Toonen +3
We report the results of the photodynamical analyses of four compact, tight triple stellar systems, KICs 6964043, 5653126, 5731312, 8023317, based largely on and da…
Importance of stable mass transfer and stellar winds for the formation of gravitational wave sources
Andris Dorozsmai, Silvia Toonen
The large number of gravitational wave (GW) detections have revealed the properties of the merging black hole binary population, but how such systems are formed is still heavily de…
Evidence for Extended Hydrogen-Poor CSM in the Three-Peaked Light Curve of Stripped Envelope Ib Supernova
Yossef Zenati, Qinan Wang, Alexey Bobrick +40
We present multi-band ATLAS photometry for SN 2019tsf, a stripped-envelope Type Ib supernova (SESN). The SN shows a triple-peaked light curve and a late (re-)brightening, making it…
A Triple Star Origin For T Pyx and Other Short-Period Recurrent Novae
C. Knigge, S. Toonen, T. C. N. Boekholt
Recurrent novae are star systems in which a massive white dwarf accretes material at such a high rate that it undergoes thermonuclear runaways every 1 - 100 years. They are the onl…
Stellar Triples as a Source for Ba Stars
Yan Gao, Silvia Toonen, Nathan Leigh
Barium stars have been studied extensively over the past few decades, yet our current understanding of how these intriguing objects formed leaves much to be desired. Many trends ob…
A gap in the double white dwarf separation distribution caused by the common-envelope evolution: astrometric evidence from Gaia
Valeriya Korol, Vasily Belokurov, Silvia Toonen
The trajectory of the center of light of an unresolved binary is different from that of its center of mass. Binary-induced stellar centroid wobbling can therefore be detected as an…