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SN2012ab: A Peculiar Type IIn Supernova with Aspherical Circumstellar Material
Christopher Bilinski, Nathan Smith, G. Grant Williams +18
We present photometry, spectra, and spectropolarimetry of supernova (SN) 2012ab, mostly obtained over the course of days after discovery. SN 2012ab was a Type IIn (SN II…
Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star
Iair Arcavi, D. Andrew Howell, Daniel Kasen +50
Every supernova hitherto observed has been considered to be the terminal explosion of a star. Moreover, all supernovae with absorption lines in their spectra show those lines decre…
Nebular-Phase Spectra of Nearby Type Ia Supernovae
Melissa L. Graham, Sahana Kumar, Griffin Hosseinzadeh +8
We present late-time spectra of eight Type Ia supernovae (SNe Ia) obtained at days after peak brightness using the Gemini South and Keck telescopes. All of the SNe Ia in our…
Science-Driven Optimization of the LSST Observing Strategy
LSST Science Collaboration, Phil Marshall, Timo Anguita +102
The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our Solar System, Galaxy and Universe, acros…
The peculiar GRB 110731A: Lorentz factor, jet composition, central engine, and progenitor
HouJun Lü, XiangGao Wang, RuiJing Lu +7
The jet compositions, central engines, and progenitors of gamma-ray bursts (GRBs) remain open questions in GRB physics. Applying broadband observations, including GRB prompt emissi…
PTF11kx: A Type Ia Supernova with Hydrogen Emission Persisting After 3.5 Years
Melissa L. Graham, Chelsea E. Harris, Ori D. Fox +4
The optical transient PTF11kx exhibited both the characteristic spectral features of Type Ia supernovae (SNe Ia) and the signature of ejecta interacting with circumstellar material…