A5044822144- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Superconducting Materials and Applications
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Neutrino Physics Research
- Advanced Data Processing Techniques
- Methane Hydrates and Related Phenomena
- Spacecraft and Cryogenic Technologies
- Adaptive optics and wavefront sensing
- Geological and Geophysical Studies
- Calibration and Measurement Techniques
- Nuclear Physics and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
Tel Aviv University
2018-2025
Canadian Institute for Advanced Research
2019-2024
Deutsches Elektronen-Synchrotron DESY
2023
Las Cumbres Observatory Global Telescope Network
2014-2021
University of California, Santa Barbara
2014-2019
Einstein Institute of Science
2017-2018
Albert Einstein College of Medicine
2018
Weizmann Institute of Science
2009-2016
Kavli Institute for Particle Astrophysics and Cosmology
2016
California Institute of Technology
2014
We present the results of a Palomar Transient Factory (PTF) archival search for blue transients which lie in magnitude range between "normal" core-collapse and superluminous supernovae (i.e. with $-21\,{\leq}M_{R\,(peak)}\,{\leq}-19$). Of six events found after excluding all interacting Type~IIn Ia-CSM supernovae, three (PTF09ge, 09axc 09djl) are coincident centers their hosts, one (10iam) is offset from center, two (10nuj 11glr) precise can not be determined. All central have similar rise...
High-quality collections of Type II supernova (SN) light curves are scarce because they evolve for hundreds days, making follow-up observations time consuming and often extending over multiple observing seasons. In these difficulties, the diversity SNe is not fully understood. Here we present ultraviolet optical photometry 12 monitored by Las Cumbres Observatory Global Telescope Network during 2013 to 2014, compare them with previously studied having well-sampled curves. We explore SN...
We present detailed optical photometry for 25 Type Ibc supernovae (SNe Ibc) within d ≈ 150 Mpc obtained with the robotic Palomar 60 inch telescope in 2004–2007. This study represents first uniform, systematic, and statistical sample of multi-band SNe light curves available to date. correct host galaxy extinction using a new technique based on photometric color evolution, namely, we show that (V − R) extinction-corrected at Δt 10 days after V-band maximum is tightly distributed, 〈(V R)V10〉 =...
Type IIn supernovae (SNe IIn) are rare events, constituting only a few percent of all core-collapse SNe, and the current sample well-observed SNe is small. Here, we study four observed by Caltech Core-Collapse Project (CCCP). The CCCP SN unbiased to extent that object selection was not influenced target properties. Therefore, these events representative population IIn. We find narrow P-Cygni profile in hydrogen Balmer lines appears be ubiquitous feature Our light curves show relatively long...
Abstract We present the discovery of Type II supernova SN 2023ixf in M101 and follow-up photometric spectroscopic observations, respectively, first month week its evolution. Our was made within a day estimated light, following light curve is characterized by rapid rise (≈5 days) to luminous peak ( M V ≈ − 18.2 mag) plateau 17.6 extending 30 days with fast decline rate ≈0.03 mag −1 . During rising phase, U color shows blueward evolution, followed redward evolution phase. Prominent flash...
Abstract We present the optical spectroscopic evolution of SN 2023ixf seen in subnight cadence spectra from 1.18 to 15 days after explosion. identify high-ionization emission features, signatures interaction with material surrounding progenitor star, that fade over first 7 days, rapid between observed within same night. compare lines and their relative strength those other supernovae early interaction, finding a close match 2020pni 2017ahn spectrum 2014G at later epochs. To physically...
Abstract We present the densely sampled early light curve of Type II supernova (SN) 2023ixf, first observed within hours explosion in nearby Pinwheel Galaxy (Messier 101; 6.7 Mpc). Comparing these data to recently updated models shock-cooling emission, we find that progenitor likely had a radius 410 ± 10 R ⊙ . Our estimate is model dependent but consistent with red supergiant. These provide good fit starting about 1 day after explosion, despite fact classification spectrum shows signatures...
Abstract The Ultraviolet Transient Astronomy Satellite (ULTRASAT) is scheduled to be launched geostationary orbit in 2027. It will carry a telescope with an unprecedentedly large field of view (204 deg 2 ) and near-ultraviolet (NUV; 230–290 nm) sensitivity (22.5 mag, 5 σ , at 900 s). ULTRASAT conduct the first wide-field survey transient variable NUV sources revolutionize our ability study hot Universe. explore new parameter space energy timescale (months-long light curves minutes cadence),...
From the first two seasons of Palomar Transient Factory, we identify three peculiar transients (PTF 09dav, PTF 10iuv, and 11bij) with five distinguishing characteristics: peak luminosity in gap between novae supernovae (MR ≈ −15.5 to −16.5 mag), rapid photometric evolution (trise 12–15 days), large photospheric velocities (≈6000–11,000 km s−1), early spectroscopic into nebular phase (≈1–3 months), spectra dominated by calcium. We also culled extensive decade-long Lick Observatory Supernova...
The intermediate Palomar Transient Factory reports our discovery of a young supernova, iPTF13bvn, in the nearby galaxy, NGC 5806 (22.5 Mpc). Our spectral sequence optical and infrared suggests Type Ib classification. We identify blue progenitor candidate deep pre-explosion imaging within 2σ error circle 80 mas (8.7 pc). has an MB luminosity −5.52 ± 0.39 mag B − I color 0.25 mag. If confirmed by future observations, this would be first direct detection for Ib. Fitting power law to early light...
On May 31, 2011 UT a supernova (SN) exploded in the nearby galaxy M51 (the Whirlpool Galaxy). We discovered this event using small telescopes equipped with CCD cameras, as well by Palomar Transient Factory (PTF) survey, and rapidly confirmed it to be Type II supernova. Our early light curve spectroscopy indicates that PTF11eon resulted from explosion of relatively compact progenitor star evidenced rapid shock-breakout cooling seen curve, low temperature early-time spectra prompt appearance...
We use the first compilation of 72 core-collapse supernovae (SNe) from Palomar Transient Factory (PTF) to study their observed subtype distribution in dwarf galaxies compared giant galaxies. Our sample is largest single-survey, untargeted, spectroscopically classified, homogeneous collection events ever assembled, spanning a wide host-galaxy luminosity range (down Mr ≈ −14 mag) and including substantial fraction (>20%) (Mr ⩾ −18 hosts. find more SNe than expected several interesting trends...
Type-IIn supernovae (SNe), which are characterized by strong interaction of their ejecta with the surrounding circumstellar matter (CSM), provide a unique opportunity to study mass-loss history massive stars shortly before explosive death. We present discovery and follow-up observations Type IIn SN, PTF 09uj, detected Palomar Transient Factory (PTF). Serendipitous GALEX at ultraviolet (UV) wavelengths rise SN light curve prior discovery. The UV rose fast, time scale few days, absolute AB...
Context. We investigate two stripped-envelope supernovae (SNe) discovered in the nearby galaxy NGC 5806 by (intermediate) Palomar Transient Factory [(i)PTF]. These SNe, designated PTF12os/SN 2012P and iPTF13bvn, exploded within ~520 days of one another at a similar distance from host-galaxy center. classify PTF12os as Type IIb SN based on our spectral sequence; iPTF13bvn has previously been classified Ib having likely progenitor with zero age main sequence (ZAMS) mass below ~17 M⊙. Because...