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Ground-based and JWST Observations of SN 2022pul: I. Unusual Signatures of Carbon, Oxygen, and Circumstellar Interaction in a Peculiar Type Ia Supernova
Matthew R. Siebert, Lindsey A. Kwok, Joel Johansson +79
Nebular-phase observations of peculiar Type Ia supernovae (SNe Ia) provide important constraints on progenitor scenarios and explosion dynamics for both these rare SNe and the more…
Ground-based and JWST Observations of SN 2022pul: II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type-Ia Supernova
Lindsey A. Kwok, Matthew R. Siebert, Joel Johansson +78
We present an analysis of ground-based and JWST observations of SN~2022pul, a peculiar "03fg-like" (or "super-Chandrasekhar") Type Ia supernova (SN Ia), in the nebular phase at 338…
SN 2022joj: A Peculiar Type Ia Supernova Possibly Driven by an Asymmetric Helium-shell Double Detonation
Chang Liu, Adam A. Miller, Samuel J. Boos +28
We present observations of SN 2022joj, a peculiar Type Ia supernova (SN Ia) discovered by the Zwicky Transient Facility (ZTF). SN 2022joj exhibits an unusually red $g_\mathrm{ZTF}-…
SN 2021zny: an early flux excess combined with late-time oxygen emission suggests a double white dwarf merger event
Georgios Dimitriadis, Kate Maguire, Viraj R. Karambelkar +28
We present a photometric and spectroscopic analysis of the ultra-luminous and slowly evolving 03fg-like Type Ia SN 2021zny. Our observational campaign starts from hours a…
Over 500 Days in the Life of the Photosphere of the Type Iax Supernova SN 2014dt
Yssavo Camacho-Neves, Saurabh W. Jha, Barnabas Barna +20
Type Iax supernovae (SN Iax) are the largest known class of peculiar white dwarf supernovae, distinct from normal Type Ia supernovae (SN Ia). The unique properties of SN Iax, espec…
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…
A JWST Near- and Mid-Infrared Nebular Spectrum of the Type Ia Supernova 2021aefx
Lindsey A. Kwok, Saurabh W. Jha, Tea Temim +55
We present JWST near- and mid-infrared spectroscopic observations of the nearby normal Type Ia supernova SN 2021aefx in the nebular phase at days past maximum light. Our Nea…
A radio-detected Type Ia supernova with helium-rich circumstellar material
Erik C. Kool, Joel Johansson, Jesper Sollerman +34
Type Ia supernovae (SNe Ia) are thermonuclear explosions of degenerate white dwarf (WD) stars destabilized by mass accretion from a companion star, but the nature of their progenit…
Spitzer's Last Look at Extragalactic Explosions: Long-Term Evolution of Interacting Supernovae
Tamás Szalai, Ori D. Fox, Richard G. Arendt +10
Here we present new - and, nevertheless, last - mid-infrared (mid-IR) data for supernovae (SNe) based on measurements with the Spitzer Space Telescope. Comparing our recent 3.6 and…
The SPIRITS sample of Luminous Infrared Transients: Uncovering Hidden Supernovae and Dusty Stellar Outbursts in Nearby Galaxies
Jacob E. Jencson, Mansi M. Kasliwal, Scott M. Adams +23
We present a systematic study of the most luminous ( [Vega magnitudes] brighter than ) infrared (IR) transients discovered by the SPitzer InfraRed Intensive T…
R-band light-curve properties of Type Ia supernovae from the (intermediate) Palomar Transient Factory
S. Papadogiannakis, A. Goobar, R. Amanullah +15
We present the best 265 sampled R-band light curves of spectroscopically identified Type Ia supernovae (SNe) from the Palomar Transient Factory (PTF; 2009-2012) survey and the inte…
iPTF16abc and the population of Type Ia supernovae: Comparing the photospheric, transitional and nebular phases
S. Dhawan, M. Bulla, A. Goobar +6
Key information about the progenitor system and the explosion mechanism of Type Ia supernovae (SNe~Ia) can be obtained from early observations, within a few days from explosion. iP…
iPTF 16hgs: A double-peaked Ca-rich gap transient in a metal poor, star forming dwarf galaxy
Kishalay De, Mansi M. Kasliwal, Therese Cantwell +18
Calcium rich gap transients represent an intriguing new class of faint and fast evolving supernovae that exhibit strong [Ca II] emission in their nebular phase spectra. In this pap…
SPIRITS 16tn in NGC 3556: A heavily obscured and low-luminosity supernova at 8.8 Mpc
Jacob E. Jencson, Mansi M. Kasliwal, Scott M. Adams +17
We present the discovery by the SPitzer InfraRed Intensive Transients Survey (SPIRITS) of a likely supernova (SN) in NGC 3556 at only 8.8 Mpc, which, despite its proximity, was not…
SPIRITS: Uncovering Unusual Infrared Transients With Spitzer
Mansi M. Kasliwal, John Bally, Frank Masci +44
We present an ongoing, systematic search for extragalactic infrared transients, dubbed SPIRITS --- SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer/IR…
SPIRITS 15c and SPIRITS 14buu: Two Obscured Supernovae in the Nearby Star-Forming Galaxy IC 2163
Jacob E. Jencson, Mansi M. Kasliwal, Joel Johansson +22
SPIRITS---SPitzer InfraRed Intensive Transients Survey---is an ongoing survey of nearby galaxies searching for infrared (IR) transients with Spitzer/IRAC. We present the discovery…
The Superluminous Transient ASASSN-15lh as a Tidal Disruption Event from a Kerr Black Hole
G. Leloudas, M. Fraser, N. C. Stone +47
When a star passes within the tidal radius of a supermassive black hole, it will be torn apart. For a star with the mass of the Sun () and a non-spinning black hole with a…
Type Ibn Supernovae Show Photometric Homogeneity and Spectral Diversity at Maximum Light
Griffin Hosseinzadeh, Iair Arcavi, Stefano Valenti +34
Type Ibn supernovae (SNe) are a small yet intriguing class of explosions whose spectra are characterized by low-velocity helium emission lines with little to no evidence for hydrog…
Flash Spectroscopy: Emission Lines from the Ionized Circumstellar Material around -Day-Old Type II Supernovae
D. Khazov, O. Yaron, A. Gal-Yam +24
Supernovae (SNe) embedded in dense circumstellar material (CSM) may show prominent emission lines in their early-time spectra ( days after the explosion), owing to recombi…
Type II supernova energetics and comparison of light curves to shock-cooling models
Adam Rubin, Avishay Gal-Yam, Annalisa De Cia +37
During the first few days after explosion, Type II supernovae (SNe) are dominated by relatively simple physics. Theoretical predictions regarding early-time SN light curves in the…
An Excess of Mid-Infrared Emission from the Type Iax SN 2014dt
Ori D. Fox, Joel Johansson, Mansi Kasliwal +12
Supernovae Type Iax (SNe Iax) are less energetic and less luminous than typical thermonuclear explosions. A suggested explanation for the observed characteristics of this subclass…
No trace of a single-degenerate companion in late spectra of SNe 2011fe and 2014J
P. Lundqvist, A. Nyholm, F. Taddia +9
Left-over, ablated material from a possible non-degenerate companion can reveal itself after about one year in spectra of Type Ia SNe (SNe Ia). We have searched for such material i…
Spitzer observations of SN 2014J and properties of mid-IR emission in Type Ia supernovae
J. Johansson, A. Goobar, M. M. Kasliwal +13
SN 2014J in M82 is the closest Type Ia supernova (SN Ia) in decades. The proximity allows for detailed studies of supernova physics and provides insights into the circumstellar and…