168 citations · 1.2k across the 41 of their papers we have counts for
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Circumstellar interaction signatures in the low luminosity type II SN 2021gmj
Nicolas Meza-Retamal, Yize Dong, K. Azalee Bostroem +25
We present comprehensive optical observations of SN~2021gmj, a Type II supernova (SN~II) discovered within a day of explosion by the Distance Less Than 40~Mpc (DLT40) survey. Follo…
The Early Ultraviolet Light-Curves of Type II Supernovae and the Radii of Their Progenitor Stars
Ido Irani, Jonathan Morag, Avishay Gal-Yam +18
We present a sample of 34 normal SNe II detected with the Zwicky Transient Facility, with multi-band UV light-curves starting at days after explosion, as well as X-ray d…
Evidence of weak circumstellar medium interaction in the Type II SN 2023axu
Manisha Shrestha, Jeniveve Pearson, Samuel Wyatt +34
We present high-cadence photometric and spectroscopic observations of SN~2023axu, a classical Type II supernova with an absolute -band peak magnitude of mag. SN~…
Implications for the Explosion Mechanism of Type Ia Supernovae from their Late-time Spectra
Jialian Liu, Xiaofeng Wang, Alexei V. Filippenko +10
Late-time spectra of Type Ia supernovae (SNe Ia) are important in clarifying the physics of their explosions, as they provide key clues to the inner structure of the exploding whit…
1100 days in the life of the supernova 2018ibb -- The best pair-instability supernova candidate, to date
Steve Schulze, Claes Fransson, Alexandra Kozyreva +63
Abridged - Stars with ZAMS masses between 140 and are thought to explode as pair-instability supernovae (PISNe). During their thermonuclear runaway, PISNe can produce…
SN 2020udy: a SN Iax with strict limits on interaction consistent with a helium-star companion
Kate Maguire, Mark R. Magee, Giorgos Leloudas +24
Early observations of transient explosions can provide vital clues to their progenitor origins. In this paper we present the nearby Type Iax (02cx-like) supernova (SN), SN 2020udy…
Early-Time Ultraviolet and Optical Hubble Space Telescope Spectroscopy of the Type II Supernova 2022wsp
Sergiy S. Vasylyev, Christian Vogl, Yi Yang +9
We report early-time ultraviolet (UV) and optical spectroscopy of the young, nearby Type II supernova (SN) 2022wsp obtained by the Hubble Space Telescope (HST)/STIS at about 10 and…
Spectropolarimetry of the type IIP supernova 2021yja: an unusually high continuum polarization during the photospheric phase
Sergiy S. Vasylyev, Yi Yang, Kishore C. Patra +9
We present six epochs of optical spectropolarimetry of the Type IIP supernova (SN) 2021yja ranging from 25 to 95 days after the explosion. An unusually high continuum linear…
JWST Discovery of Dust Reservoirs in Nearby Type IIP Supernovae 2004et and 2017eaw
Melissa Shahbandeh, Arkaprabha Sarangi, Tea Temim +36
Supernova (SN) explosions have been sought for decades as a possible source of dust in the Universe, providing the seeds of galaxies, stars, and planetary systems. SN 1987A offers…
A Systematic Study of Ia-CSM Supernovae from the ZTF Bright Transient Survey
Yashvi Sharma, Jesper Sollerman, Christoffer Fremling +35
Among the supernovae (SNe) that show strong interaction with the circumstellar medium, there is a rare subclass of Type Ia supernovae, SNe Ia-CSM, that show strong narrow hydrogen…
The prevalence and influence of circumstellar material around hydrogen-rich supernova progenitors
Rachel J. Bruch, Avishay Gal-Yam, Ofer Yaron +44
Narrow transient emission lines (flash-ionization features) in early supernova (SN) spectra trace the presence of circumstellar material (CSM) around the massive progenitor stars o…
The Interaction of Supernova 2018evt with a Substantial Amount of Circumstellar Matter -- An SN1997cy-like Event
Yi Yang, Dietrich Baade, Peter Hoeflich +29
A rare class of supernovae (SNe) is characterized by strong interaction between the ejecta and several solar masses of circumstellar matter (CSM) as evidenced by strong Balmer-line…
Probing the low-mass end of core-collapse supernovae using a sample of strongly-stripped Calcium-rich Type IIb Supernovae from the Zwicky Transient Facility
Kaustav K. Das, Mansi M. Kasliwal, Christoffer Fremling +23
The fate of stars in the zero-age main-sequence (ZAMS) range Msun is unclear. They could evolve to form white dwarfs or explode as electron-capture supernovae (SNe)…
SN 2022oqm -- a Ca-rich explosion of a compact progenitor embedded in C/O circumstellar material
I. Irani, Ping Chen, Jonathan Morag +27
We present the discovery and analysis of SN\,2022oqm, a Type Ic supernova (SN) detected \,day after explosion. The SN rises to a blue and short-lived (2\,days) initial peak. Ea…
Circumstellar Medium Interaction in SN 2018lab, A Low-Luminosity II-P Supernova observed with TESS
Jeniveve Pearson, Griffin Hosseinzadeh, David J. Sand +21
We present photometric and spectroscopic data of SN 2018lab, a low luminosity type IIP supernova (LLSN) with a V-band peak luminosity of mag. SN 2018lab was discovere…
Observations of the Very Young Type Ia Supernova 2019np with Early-excess Emission
Hanna Sai, Xiaofeng Wang, Nancy Elias-Rosa +30
Early-time radiative signals from type Ia supernovae (SNe Ia) can provide important constraints on the explosion mechanism and the progenitor system. We present observations and an…
Early-Time Ultraviolet Spectroscopy and Optical Follow-up Observations of the Type IIP Supernova 2021yja
Sergiy S. Vasylyev, Alexei V. Filippenko, Christian Vogl +19
We present three epochs of early-time ultraviolet (UV) and optical HST/STIS spectroscopy of the young, nearby Type IIP supernova (SN) 2021yja. We complement the HST data with two e…
The Type Icn SN 2021csp: Implications for the Origins of the Fastest Supernovae and the Fates of Wolf-Rayet Stars
Daniel A. Perley, Jesper Sollerman, Steve Schulze +31
We present observations of SN 2021csp, the second example of a newly-identified type of supernova (Type Icn) hallmarked by strong, narrow, P Cygni carbon features at early times. T…
Spectropolarimetry of the Type Ia SN 2019ein rules out significant global asphericity of the ejecta
Kishore C. Patra, Yi Yang, Thomas G. Brink +12
Detailed spectropolarimetric studies may hold the key to probing the explosion mechanisms and the progenitor scenarios of Type Ia supernovae (SNe Ia). We present multi-epoch spectr…
Bright, months-long stellar outbursts announce the explosion of interaction-powered supernovae
Nora L. Strotjohann, Eran O. Ofek, Avishay Gal-Yam +53
Interaction-powered supernovae (SNe) explode within an optically-thick circumstellar medium (CSM) that could be ejected during eruptive events. To identify and characterize such pr…
A large fraction of hydrogen-rich supernova progenitors experience elevated mass loss shortly prior to explosion
Rachel J. Bruch, Avishay Gal-Yam, Steve Schulze +43
Spectroscopic detection of narrow emission lines traces the presence of circumstellar mass distributions around massive stars exploding as core-collapse supernovae. Transient emiss…
Early Ultra-Violet observations of type IIn supernovae constrain the asphericity of their circumstellar material
Maayane T. Soumagnac, Eran O. Ofek, Jingyi Liang +41
We present a survey of the early evolution of 12 Type IIn supernovae (SNe IIn) in the Ultra-Violet (UV) and visible light. We use this survey to constrain the geometry of the circu…
SN 2018fif: The Explosion of a Large Red Supergiant Discovered in Its Infancy by the Zwicky Transient Facility
Maayane T. Soumagnac, Noam Ganot, Ido Irani +32
High cadence transient surveys are able to capture supernovae closer to their first light than before. Applying analytical models to such early emission, we can constrain the proge…
SN 2016hil-- a Type II supernova in the remote outskirts of an elliptical host and its origin
Ido Irani, Steve Schulze, Avishay Gal-Yam +14
Type II supernovae (SNe) stem from the core collapse of massive () stars. Owing to their short lifespan, we expect a very low rate of such events in elliptical host…