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Neutron Star - White Dwarf Binaries: Probing Formation Pathways and Natal Kicks with LISA
Valeriya Korol, Andrei P. Igoshev, Silvia Toonen +4
Neutron star-white dwarf (NS+WD) binaries offer a unique opportunity for studying NS-specific phenomena with gravitational waves. In this paper, we employ the binary population syn…
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…
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…
Near-Chandrasekhar-Mass Type Ia Supernovae from the Double-Degenerate Channel
Sudarshan Neopane, Khanak Bhargava, Robert Fisher +4
Recent observational evidence has demonstrated that white dwarf (WD) mergers are a highly efficient mechanism for mass accretion onto WDs in the galaxy. In this paper, we show that…
Spatially Resolved X-ray Study of Supernova Remnant G306.30.9 with Unusually High Calcium Abundance
Jianbin Weng, Ping Zhou, Yang Chen +6
G306.30.9 is an asymmetric Galactic supernova remnant (SNR), whose progenitor has been thought to be a Type Ia supernova (SN), but its high Ca abundance appears inconsistent wit…
Combined analysis of neutron star natal kicks using proper motions and parallax measurements for radio pulsars and Be X-ray binaries
Andrei P. Igoshev, Martyna Chruslinska, Andris Dorozsmai +1
Supernova explosion and the associated neutron star natal kicks are important events on a pathway of a binary to become a gravitational wave source, an X-ray binary or a millisecon…
Observationally driven Galactic double white dwarf population for LISA
Valeriya Korol, Na'ama Hallakoun, Silvia Toonen +1
Realistic models of the Galactic double white dwarf (DWD) population are crucial for testing and quantitatively defining the science objectives of the Laser Interferometer Space An…
Massive Stellar Triples Leading to Sequential Binary Black-Hole Mergers in the Field
Alejandro Vigna-Gómez, Silvia Toonen, Enrico Ramirez-Ruiz +3
Stellar triples with massive stellar components are common, and can lead to sequential binary black-hole mergers. Here, we outline the evolution towards these sequential mergers, a…
The nearest discovered black hole is likely not in a triple configuration
Mohammadtaher Safarzadeh, Silvia Toonen, Abraham Loeb
HR 6819 was recently claimed to be a hierarchical triple system of a Be star in a wide orbit around an inner binary system of a black hole (BH) and a B III type star. We argue that…
Normal type Ia supernovae from disruptions of hybrid He-CO white-dwarfs by CO white-dwarfs
Hagai B. Perets, Yossef Zenati, Silvia Toonen +1
Type Ia supernovae (SNe) are thought to originate from the thermonuclear explosions of carbon-oxygen (CO) white dwarfs (WDs). The proposed progenitors of standard type Ia SNe have…
Transients following white dwarfs mergers
Maxim Lyutikov, Silvia Toonen
Mergers of white dwarfs (WDs) may lead to a variety of transient astrophysical events, SNIa being one possible outcome. Lyutikov & Toonen (2017, 2019) argued that mergers of WDs re…
FBOTs and AT2018cow following electron-capture collapse of merged white dwarfs
Maxim Lyutikov, Silvia Toonen
We suggest that fast-rising blue optical transients (FBOTs) and the brightest event of the class AT2018cow result from an electron-capture collapse to a \NS\ following a merger of…
Neutron star - white dwarf mergers: Early evolution, physical properties, and outcomes
Yossef Zenati, Hagai B. Perets, Silvia Toonen
Neutron-star (NS) - white-dwarf (WD) mergers may give rise to observable explosive transients, but have been little explored. We use 2D coupled hydrodynamical-thermonuclear FLASH-c…
The demographics of neutron star - white dwarf mergers: rates, delay-time distributions and progenitors
S. Toonen, H. B. Perets, A. P. Igoshev +2
The mergers of neutron stars (NSs) and white dwarfs (WDs) could give rise to explosive transients, potentially observable with current and future transient surveys. However, the ex…
The Evolution of the Type Ia Supernova Luminosity Function
Ken J. Shen, Silvia Toonen, Or Graur
Type Ia supernovae (SNe Ia) exhibit a wide diversity of peak luminosities and light curve shapes: the faintest SNe Ia are 10 times less luminous and evolve more rapidly than the br…
Short Gamma-Ray Bursts following mergers of an ONeMg with a CO white dwarf
Maxim Lyutikov, Silvia Toonen
We discuss a scenario of short Gamma-Ray Bursts (GRBs) following a merger of a massive ONeMg white dwarf (WD) with a CO WD, and an ensuing accretion induced collapse (AIC). An init…
The rate of WD-WD head-on collisions in isolated triples is too low to explain standard type Ia supernovae
S. Toonen, H. B. Perets, A. S. Hamers
Type Ia supernovae (Ia-SNe) are thought to arise from the thermonuclear explosions of white dwarfs (WDs). The progenitors of such explosions are still highly debated; in particular…
Prospects for detection of detached double white dwarf binaries with Gaia, LSST and LISA
Valeriya Korol, Elena M. Rossi, Paul J. Groot +3
Double white dwarf (DWD) binaries are expected to be very common in the Milky Way, but their intrinsic faintness challenges the detection of these systems. Currently, only a few te…