487 citations · 11.9k across the 114 of their papers we have counts for
19 papers · 1 filter
Multi-Epoch Spectropolarimetry for a Sample of Type IIn Supernovae: Persistent Asymmetry in Dusty Circumstellar Material
Christopher Bilinski, Nathan Smith, G. Grant Williams +5
We present multi-epoch spectropolarimetry and spectra for a sample of 14 Type IIn supernovae (SNe IIn). We find that after correcting for likely interstellar polarization, SNe IIn…
Making Sense of Nothing
Douglas C. Leonard
A model of the optical light detected following the merger of two neutron stars reveals polarization to be a unique probe of the geometry of the kilonova explosion that accompanied…
A High-Velocity Scatterer Revealed in the Thinning Ejecta of a Type II Supernova
Douglas C. Leonard, Luc Dessart, D. John Hillier +7
We present deep, nebular-phase spectropolarimetry of the Type II-P/L SN 2013ej, obtained 167 days after explosion with the European Southern Observatory's Very Large Telescope. The…
Polarization signatures of a high-velocity scatterer in nebular-phase spectra of Type II supernovae
Luc Dessart, D. John Hillier, Douglas C. Leonard
Type II supernovae (SNe) often exhibit a linear polarization, arising from free-electron scattering, with complicated optical signatures, both in the continuum and in lines. Focusi…
Multiepoch VLT-FORS spectro-polarimetric observations of supernova 2012aw reveal an asymmetric explosion
Luc Dessart, Douglas C. Leonard, D. John Hillier +1
We present VLT-FORS spectropolarimetric observations of the type II supernova (SN) 2012aw taken at seven epochs during the photospheric phase, from 16 to 120d after explosion. We c…
The Type II-Plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor
Schuyler D. Van Dyk, WeiKang Zheng, Justyn R. Maund +31
We present extensive optical photometric and spectroscopic observations, from 4 to 482 days after explosion, of the Type II-plateau (II-P) supernova (SN) 2017eaw in NGC 6946. SN 20…
Supernova 2017eaw: molecule and dust formation from infrared observations
Samaporn Tinyanont, Mansi M Kasliwal, Kelsie Krafton +15
We present infrared (IR) photometry and spectroscopy of the Type II-P SN 2017eaw and its progenitor in the nearby galaxy NGC 6946. Progenitor observations in the Ks band in 4 epoch…
Swift monitoring of NGC 4151: Evidence for a Second X-ray/UV Reprocessing
R. Edelson, J. Gelbord, E. Cackett +41
Swift monitoring of NGC 4151 with ~6 hr sampling over a total of 69 days in early 2016 is used to construct light curves covering five bands in the X-rays (0.3-50 keV) and six in t…
Asymmetries in SN 2014J Near Maximum Light Revealed Through Spectropolarimetry
Amber L. Porter, Mark D. Leising, G. Grant Williams +7
We present spectropolarimetric observations of the nearby Type Ia SN 2014J in M82 over six epochs: +0, +7, +23, +51, +77, +109, and +111 days with respect to B-band maximum. The st…
Long-rising Type II supernovae from PTF and CCCP
F. Taddia, J. Sollerman, C. Fremling +17
Supernova (SN) 1987A was a peculiar H-rich event with a long-rising (LR) light curve (LC), stemming from a compact blue supergiant star (BSG). Only a few similar events have been p…
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…
PTF11iqb: Cool supergiant mass loss that bridges the gap between Type IIn and normal supernovae
Nathan Smith, Jon C. Mauerhan, S. Bradley Cenko +16
PTF11iqb was initially classified as a TypeIIn event caught very early after explosion. It showed narrow Wolf-Rayet (WR) spectral features on day 2, but the narrow emission weakene…
A Sample of Type II-L Supernovae
T. Faran, D. Poznanski, A. V. Filippenko +8
What are Type II-Linear supernovae (SNe II-L)? This class, which has been ill defined for decades, now receives significant attention -- both theoretically, in order to understand…
Early Emission from the Type IIn Supernova 1998S at High Resolution
Isaac Shivvers, Jose H. Groh, Jon C. Mauerhan +3
The well-studied Type IIn supernova (SN) 1998S is often dubbed the prototypical SN IIn, and it provides a unique opportunity to study its progenitor star from within as the SN ligh…
Photometric and Spectroscopic Properties of Type II-P Supernovae
Tamar Faran, Dovi Poznanski, Alexei V. Filippenko +9
We study a sample of 23 Type II Plateau supernovae (SNe II-P), all observed with the same set of instruments. Analysis of their photometric evolution confirms that their typical pl…
Circumstellar Material in Type Ia Supernovae via Sodium Absorption Features
Assaf Sternberg, Avishay Gal-Yam, Josh D. Simon +17
Type Ia supernovae are key tools for measuring distances on a cosmic scale. They are generally thought to be the thermonuclear explosion of an accreting white dwarf in a close bina…
The old environment of the faint calcium-rich supernova SN 2005cz
Hagai B. Perets, Avishay Gal-yam, R. Mark Crockett +5
The supernova SN 2005cz has recently attracted some attention, due to the fact that it was spectroscopically similar to type Ib supernovae (SNe), a class that is presumed to result…
A faint type of supernova from a white dwarf with a helium-rich companion
H. B. Perets, A. Gal-Yam, P. Mazzali +25
Supernovae (SNe) are thought to arise from two different physical processes. The cores of massive, short-lived stars undergo gravitational core collapse and typically eject a few s…
An Intermediate Luminosity Transient in NGC300: The Eruption of a Dust-Enshrouded Massive Star
E. Berger, A. M. Soderberg, R. A. Chevalier +10
[abridged] We present multi-epoch high-resolution optical spectroscopy, UV/radio/X-ray imaging, and archival Hubble and Spitzer observations of an intermediate luminosity optical t…