355 citations · 1.6k across the 42 of their papers we have counts for
43 papers
S301 and friends: Measuring the spin of Sgr A*
T. Piran, P. Amaro-Seoane, B. Aytac +15
The discovery of S301 (GRAVITY Collaboration et al., 2026) with pericenter distance rp= 280rg and eccentricity e=0.9825, opens the prospect of measuring the spin parameter of Sgr A…
Discovery of a star sensitive to the spin of Sgr A*
K. Abd El Dayem, R. Abuter, N. Aimar +85
Residing in the center of the Milky Way, Sgr A* is the closest massive black hole (MBH). Its vicinity has allowed measuring individual stellar orbits around it. The stars act as te…
When to Align, When to Predict: A Phase Diagram for Multimodal Learning
Ilay Kamai, Hugues Van Assel, Aviv Regev +2
Cross-modal alignment (CA) and cross-modal prediction (CP) are the dominant paradigms for multimodal representation learning, yet there is no systematic understanding of when each…
The bound origin of low-mass stellar binaries
A. Generozov, S. S. R. Offner, K. M. Kratter +3
Most main sequence stars, unlike our Sun, belong to multiple systems with two or more stars. How and when these multiples come together and become bound is uncertain, since the ear…
It's always the quiet ones: Single Degenerate Double Detonation Type Ia Supernova from Quiescent Helium Accretion
Amir Michaelis, Yael Hillman, Hagai B. Perets
We investigate a sub-Chandrasekhar mass double detonation pathway for Type Ia supernovae arising from single degenerate helium accreting carbon-oxygen white dwarfs. Building on our…
Faint supernovae and hyper-runaway white-dwarfs from single He-detonation in double HeCO-white-dwarf mergers
Hila Glanz, Hagai B. Perets, Aakash Bhat
We present three-dimensional hydrodynamical simulations of mergers between low-mass hybrid HeCO white dwarfs (WDs), offering new insights into the diversity of thermonuclear transi…
Gas in Globular Clusters I: Gas Retention and Its Possible Consequences
Alexey Bobrick, Melvyn B. Davies, Hagai B. Perets
Globular clusters host complex stellar populations whose chemical signatures suggest early (3 Myr - 1 Gyr) retention and reprocessing of stellar ejecta, yet direct evidence for int…
The Single-Degenerate Channel Leads to Type Iax and Not Type Ia Supernovae due to Premature Ignition
Amir Michaelis, Hagai B. Perets
Type Ia supernovae (SNe Ia) are a critical tool for cosmology and galactic enrichment, yet the progenitor systems of normal SNe Ia remain a central puzzle. The long-debated single-…
An interferometric study of B star multiplicity
A. J. Frost, H. Sana, J-B Le Bouquin +7
Massive stars can have extreme effects on their environments from local to galactic scales. While O star multiplicity has been studied over a broad separation range (to the point w…
The S stars' zone of avoidance in the Galactic center
Aleksey Generozov, Hagai B. Perets, Matteo S. Bordoni +9
This paper investigates the origin and orbital evolution of S stars in the Galactic center using models of binary disruption and relaxation processes. We focus on explaining the re…
The origin of hypervelocity white dwarfs in the merger-disruption of He-CO white dwarfs
Hila Glanz, Hagai B. Perets, Aakash Bhat +1
Hypervelocity white dwarfs (HVWDs) are stellar remnants moving at speeds exceeding the Milky Way's escape velocity. The origins of the fastest HVWDs are enigmatic, with proposed fo…
The formation of mini-AGN disks around IMBHs and their dynamical implications
Mor Rozner, Alessandro A. Trani, Johan Samsing +1
This study explores the formation and implications of mini-active galactic nuclei (mAGN) disks around intermediate-mass black holes (IMBHs) embedded in gas-rich globular/nuclear cl…
Three-Body Binary Formation in Clusters: Analytical Theory
Yonadav Barry Ginat, Hagai B. Perets
Binary formation in clusters through triple encounters between three unbound stars, 'three-body' binary formation, is one of the main dynamical formation processes of binary system…
Soft no more: gas shielding protects soft binaries from disruption in gas-rich environments
Mor Rozner, Hagai B. Perets
Binaries in dense environments are traditionally classified as soft or hard based on their binding energy relative to the kinetic energy of surrounding stars. Heggie's law suggests…
Upper Limits of Ti Decay Emission in Four Nearby Thermonuclear Supernova Remnants
Jianbin Weng, Ping Zhou, Hagai B. Perets +2
To identify progenitors and investigate evidence of He burning, we searched for decay radiation of freshly synthesized Ti in four young nearby thermonuclear supernova remnan…
A Triple Scenario for the Formation of Wide Black Hole Binaries Such As Gaia BH1
A. Generozov, H. B. Perets
Recently, several non-interacting black hole-stellar binaries have been identified in Gaia data. For example, Gaia BH1, where a Sun-like star is in a moderate eccentricity (e=0.44)…
ULTRASAT: A wide-field time-domain UV space telescope
Y. Shvartzvald, E. Waxman, A. Gal-Yam +41
The Ultraviolet Transient Astronomy Satellite (ULTRASAT) is scheduled to be launched to geostationary orbit in 2026. It will carry a telescope with an unprecedentedly large field o…
Born to be wide: the distribution of wide binaries in the field and soft binaries in clusters
Mor Rozner, Hagai B. Perets
Most stars, binaries, and higher multiplicity systems are thought to form in stellar clusters and associations, which later dissociate. Very wide binaries can be easily disrupted i…
Capture of stars into gaseous discs around massive black holes: Alignment, circularization and growth
Aleksey Generozov, Hagai B. Perets
The majority of massive black holes (MBHs) likely hosted gas discs during their lifetimes. These could either be long-lived active galactic nuclei (AGN) discs, or shorter-lived dis…
Binary formation through gas-assisted capture and the implications for stellar, planetary and compact-object evolution
Mor Rozner, Aleksey Generozov, Hagai B. Perets
Binary systems are ubiquitous and their formation requires two-body interaction and dissipation. In gaseous media, interactions between two initially unbound objects could result i…
Resonant Dynamical Friction Around a Super-Massive Black Hole: Analytical Description
Yonadav Barry Ginat, Taras Panamarev, Bence Kocsis +1
We derive an analytical model for the so-called phenomenon of `resonant dynamical friction', where a disc of stars around a super-massive black hole interacts with a massive pertur…
Using Ti Emission to Differentiate Between Thermonuclear Supernova Progenitors
Daniel Kosakowski, Mark Ivan Ugalino, Robert Fisher +3
The radiosotope Ti is produced through -rich freezeout and explosive helium burning in type Ia supernovae (SNe Ia). In this paper, we discuss how the detection of …
Hyper-runaway and hypervelocity white dwarf candidates in \textit{Gaia} Data Release 3: possible remnants from Ia/Iax supernova explosions or dynamical encounters
Andrei P. Igoshev, Hagai Perets, Na'ama Hallakoun
Type Ia and other peculiar supernovae (SNe) are thought to originate from the thermonuclear explosions of white dwarfs (WDs). Some of the proposed channels involve the ejection of…
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…