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A milli-Tidal Disruption Event Model for GRB250702B: Main Sequence Star Disrupted by an IMBH
Jonathan Granot, Hagai B. Perets, Ramandeep Gill +2
GRB250702B is the longest GRB recorded so far, with multiple gamma-ray emission episodes spread over a duration exceeding ks and a weaker soft X-ray pre-peak day…
Ultra-long Gamma-ray Bursts from Micro-Tidal Disruption Events: The Case of GRB 250702B
Paz Beniamini, Hagai B. Perets, Jonathan Granot
Ultra-long gamma-ray bursts (ULGRBs), a rare class of high-energy transients with durations s, remain poorly understood. GRB 250702B is notable for its multi-hour prompt emi…
Extreme-mass ratio inspirals in strong segregation regime -- to inspiral or to get ejected?
Karamveer Kaur, Hagai Perets
Extreme-mass ratio inspirals (EMRIs) of stellar-mass black holes (BHs) are among the main targets for upcoming low-frequency gravitational wave (GW) detectors such as the Laser Int…
Morphology and Mach Number Dependence of Subsonic Bondi-Hoyle Accretion
Logan J. Prust, Hila Glanz, Lars Bildsten +2
We carry out three-dimensional computations of the accretion rate onto an object (of size and mass ) as it moves through a uniform medium at a subsonic speed $v_{…
Simulating the tidal disruption of stars by stellar-mass black holes using moving-mesh hydrodynamics
Pavan Vynatheya, Taeho Ryu, Ruediger Pakmor +2
In the centers of dense star clusters, close encounters between stars and compact objects are likely to occur. We study tidal disruption events of main-sequence (MS) stars by stell…
Supernova explosions in active galactic nuclear discs
Evgeni Grishin, Alexey Bobrick, Ryosuke Hirai +2
Active galactic nuclei (AGN) are prominent environments for stellar capture, growth and formation. These environments may catalyze stellar mergers and explosive transients, such as…
Distinguishing Tidal Disruption Events from Impostors
Ann Zabludoff, Iair Arcavi, Stephanie La Massa +15
Recent claimed detections of tidal disruption events (TDEs) in multi-wavelength data have opened potential new windows into the evolution and properties of otherwise dormant superm…
Transients from ONe White-Dwarf - Neutron-Star/Black-Hole Mergers
Alexey Bobrick, Yossef Zenati, Hagai B. Perets +2
We conduct the first 3D hydrodynamic simulations of oxygen-neon white dwarf-neutron star/black hole mergers (ONe WD-NS/BH mergers). Such mergers constitute a significant fraction,…
No velocity-kicks are required to explain large-distance offsets of Ca-rich supernovae and short-GRBs
Hagai B. Perets, Paz Beniamini
The environments of explosive transients link their progenitors to the underlying stellar population, providing critical clues for their origins. However, some Ca-rich supernovae (…
Late-time Observations of Calcium-Rich Transient SN 2019ehk Reveal a Pure Radioactive Decay Power Source
Wynn V. Jacobson-Galán, Raffaella Margutti, Charles D. Kilpatrick +11
We present imaging of the Calcium-rich supernova (SN) 2019ehk at 276 - 389 days after explosion. These observations represent the latest photometr…
SN 2019ehk: A Double-Peaked Ca-rich Transient with Luminous X-ray Emission and Shock-Ionized Spectral Features
Wynn V. Jacobson-Galán, Raffaella Margutti, Charles D. Kilpatrick +64
We present panchromatic observations and modeling of the Calcium-rich supernova 2019ehk in the star-forming galaxy M100 (d16.2 Mpc) starting 10 hours after explosion and c…
The former companion of the hyper-velocity star S5-HVS1
Wenbin Lu, Jim Fuller, Yael Raveh +4
The hyper-velocity star S5-HVS1, ejected 5 Myr ago from the Galactic Center at 1800 km/s, was most likely produced by tidal break-up of a tight binary by the supermassive black hol…
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…
Inferred timescales for common envelope ejection using wide astrometric companions
Andrei P. Igoshev, Hagai B. Perets, Erez Michaely
Evolution of close binaries often proceeds through the common envelope stage. The physics of the envelope ejection (CEE) is not yet understood, and several mechanisms were suggeste…
Wide binary companions to massive stars and their use in constraining natal kicks
Andrei P. Igoshev, Hagai B. Perets
The origin of ultra-wide massive binaries (orbital separations ~AU) and their properties are not well characterized nor understood. Here we use the second Gaia d…
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…
Supernova and prompt gravitational-wave precursors to LIGO gravitational-wave sources and short-GRBs
Erez Michaely, Hagai B. Perets
Binary black-holes (BHs) and binary neutron-stars (NSs) mergers had been recently detected through gravitational-wave (GW) emission, with the latter followed by post-merger electro…
Spectral features of tidal-disruption candidates and alternative origins for such transient flares
Curtis J. Saxton, Hagai B. Perets, Alexei Baskin
UV and optically selected candidates for stellar tidal disruption events (TDE) often exhibit broad spectral features (HeII emission, H emission, or absorption lines) on a blackb…
Neutron star natal kicks: Collisions, TDEs, faint SNe, GRBs and GW sources with preceding electromagnetic counterparts
Erez Michaely, Dimitry Ginzburg, Hagai B. Perets
Based on the observed high velocity of pulsars it is thought that neutron stars (NSs) receive a significant velocity kick at birth. Such natal kicks are considered to play an impor…
Micro - tidal disruption events by stellar compact objects and the production of ultra-long GRBs
Hagai B. Perets, Zhuo Li, James C. Lombardi +1
We explore full/partial tidal disruption events (TDEs) of stars/planets by stellar compact objects (Black holes; BHs; or neutron stars; NSs), which we term micro-TDEs. Disruption o…
Supernovae from direct collisions of white dwarfs and the role of helium shell ignition
Oded Papish, Hagai B. Perets
Models for supernovae (SNe) arising from thermonuclear explosions of white dwarfs (WDs) have been extensively studied over the last few decades, mostly focusing on the single degen…
Origin of the Galactic 511 keV emission from positrons produced in irregular supernovae
Hagai B. Perets
Gamma ray emission of 511 keV lines arising from electron-positron annihilation has been detected from the Galaxy since the 70s. Spatially resolved observations using the INTEGRAL…
Failed-Detonation Supernovae: Sub-Luminous Low-Velocity Ia Supernovae and Their Kicked Remnant White Dwarfs with Iron-Rich Cores
George C. Jordan, Hagai B. Perets, Robert T. Fisher +1
Type Ia supernovae (SNe Ia) originate from the thermonuclear explosions of carbon-oxygen (C-O) white dwarfs (WDs). The single-degenerate scenario is a well-explored model of SNe Ia…