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Target of Opportunity Observations of Gravitational Wave Events with LSST
R. Margutti, P. Cowperthwaite, Z. Doctor +79
The discovery of the electromagnetic counterparts to the binary neutron star merger GW170817 has opened the era of GW+EM multi-messenger astronomy. Exploiting this breakthrough req…
A Hydrogen-Poor Superluminous Supernova with Enhanced Iron-Group Absorption: A New Link Between SLSNe and Broad-Lined Type Ic SNe
P. K. Blanchard, M. Nicholl, E. Berger +4
We present optical observations of the Type I superluminous supernova (SLSN-I) SN2017dwh at , which reached mag at peak. Spectra taken a few…
An embedded X-ray source shines through the aspherical AT2018cow: revealing the inner workings of the most luminous fast-evolving optical transients
Raffaella Margutti, B. D. Metzger, R. Chornock +41
We present the first extensive radio to gamma-ray observations of a fast-rising blue optical transient (FBOT), AT2018cow, over its first ~100 days. AT2018cow rose over a few days t…
The Temperature and Ionization of Unshocked Ejecta in Cas A
J. C. Raymond, B. -C. Koo, Y. -H. Lee +3
The supernova remnant Cassiopeia A (Cas A) is one of the few remnants in which it is possible to observe unshocked ejecta. A deep 1.64 micron image of Cas A shows a patch of diffus…
Where is the engine hiding its missing energy? Constraints from a deep X-ray non-detection of the Superluminous SN 2015bn
Kornpob Bhirombhakdi, Ryan Chornock, Raffaella Margutti +5
SN 2015bn is a nearby hydrogen-poor superluminous supernova (SLSN-I) that has been intensively observed in X-rays with the goal to detect the spin-down powered emission from a magn…
Evidence for a pulsar wind nebula in the Type Ib-peculiar supernova SN 2012au
Dan Milisavljevic, Daniel J. Patnaude, Roger A. Chevalier +5
We present an optical spectrum of the energetic Type Ib supernova (SN) 2012au obtained at an unprecedented epoch of 6.2 years after explosion. Forbidden transition emission lines o…
The Type I Superluminous Supernova PS16aqv: Lightcurve Complexity and Deep Limits on Radioactive Ejecta in a Fast Event
P. K. Blanchard, M. Nicholl, E. Berger +6
[Abridged] We present UV/optical observations of PS16aqv (SN 2016ard), a Type I superluminous supernova (SLSN-I) classified as part of our search for low- SLSNe. PS16aqv is a fa…
Peculiar Supernovae
Dan Milisavljevic, Raffaella Margutti
What makes a supernova truly `peculiar?' In this chapter we attempt to address this question by tracing the history of the use of `peculiar' as a descriptor of non-standard superno…
SN 2017ein and the Possible First Identification of a Type Ic Supernova Progenitor
Schuyler D. Van Dyk, WeiKang Zheng, Thomas G. Brink +11
We have identified a progenitor candidate in archival Hubble Space Telescope (HST) images for the Type Ic SN 2017ein in NGC 3938, pinpointing the candidate's location via HST Targe…
MMT Spectroscopy of Supernova Remnant Candidates in M33
Knox S. Long, William P. Blair, Dan Milisavljevic +2
To date, over 220 emission nebulae in M33 have been identified as supernova remnants (SNRs) or SNR candidates, principally through [SII]:Halpha line ratios that are elevated compar…