author={J. Silverman and P. Nugent and A. Gal-Yam and M. Sullivan and D. Howell and A. Filippenko and I. Arcavi and S. Ben-Ami and J. Bloom and S. Cenko and Yi Cao and R. Chornock and K. Clubb and A. Coil and R. Foley and M. Graham and C. Griffith and A. Horesh and M. Kasliwal and S. Kulkarni and D. Leonard and Weidong Li and T. Matheson and Adam A. Miller and M. Modjaz and E. Ofek and Yen-Chen Pan and D. Perley and D. Poznanski and R. Quimby and T. Steele and A. Sternberg and Dong Xu and O. Yaron},
  journal={Astrophysical Journal Supplement Series},
Owing to their utility for measurements of cosmic acceleration, Type Ia supernovae (SNe Ia) are perhaps the best-studied class of SNe, yet the progenitor systems of these explosions largely remain a mystery. A rare subclass of SNe Ia shows evidence of strong interaction with their circumstellar medium (CSM), and in particular, a hydrogen-rich CSM; we refer to them as SNe Ia-CSM. In the first systematic search for such systems, we have identified 16 SNe Ia-CSM, and here we present new spectra of… Expand
Against the Wind: Radio Light Curves of Type Ia Supernovae Interacting with Low-Density Circumstellar Shells
For decades, a wide variety of observations spanning the radio through optical and on to the x-ray have attempted to uncover signs of type Ia supernovae (SNe Ia) interacting with a circumstellarExpand
New approaches to SNe Ia progenitors
Although Type Ia supernovae (SNe Ia) are a major tool in cosmology and play a key role in the chemical evolution of galaxies, the nature of their progenitor systems (apart from the fact that theyExpand
An Excess of Mid-Infrared Emission from the Type Iax SN 2014dt
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 is a binaryExpand
Observational Clues to the Progenitors of Type Ia Supernovae
Type Ia supernovae (SNe Ia) are important distance indicators, element factories, cosmic-ray accelerators, kinetic-energy sources in galaxy evolution, and end points of stellar binary evolution. ItExpand
Kepler's Supernova: An Overluminous Type Ia Event Interacting with a Massive Circumstellar Medium at a Very Late Phase
We have analyzed XMM-Newton, Chandra, and Suzaku observations of Kepler's supernova remnant (SNR) to investigate the properties of both the SN ejecta and the circumstellar medium (CSM). ForExpand
Interacting Supernovae: Types IIn and Ibn
Supernovae (SNe) that show evidence of strong shock interaction between their ejecta and pre-existing, slower circumstellar material (CSM) constitute an interesting, diverse, and still poorlyExpand
A Deep Search for Prompt Radio Emission from Thermonuclear Supernovae with the Very Large Array
Searches for circumstellar material around Type Ia supernovae (SNe Ia) are one of the most powerful tests of the nature of SN Ia progenitors, and radio observations provide a particularly sensitiveExpand
SN2012ca: A stripped envelope core-collapse SN interacting with dense circumstellar medium
We report optical and near-infrared observations of SN 2012ca with the Public ESO Spectroscopy Survey of Transient Objects (PESSTO), spread over one year since discovery. The supernova (SN) bearsExpand
Searching for swept-up hydrogen and helium in the late-time spectra of 11 nearby Type Ia supernovae
The direct detection of a stellar system that explodes as a Type Ia supernova (SN Ia) has not yet been successful. Various indirect methods have been used to investigate SN Ia progenitor systems butExpand
On the nature of Type IIn/Ia–CSM supernovae: optical and near-infrared spectra of SN 2012ca and SN 2013dn
A growing subset of Type Ia supernovae (SNe Ia) show evidence for unexpected interaction with a dense circumstellar medium (SNe Ia-CSM). The precise nature of the progenitor, however, remainsExpand


Subaru spectroscopy of the interacting type Ia supernova SN 2002ic: evidence of a hydrogen-rich, asymmetric circumstellar medium
Optical spectroscopy of the Type Ia supernova SN 2002ic obtained on 2003 June 27.6 UT, i.e., ~222 rest-frame days after explosion, is presented. Strong H emission indicates an interaction between theExpand
Supernova 2008J: early time observations of a heavily reddened SN 2002ic-like transient
Supernovae (SNe) are the final stage in the life of massive stars. Their explosion unbinds the progenitor star revealing its inner layers. The SN ejecta interact with the circumstellar materialExpand
Comparing the ejecta velocities at maximum brightness and narrow circumstellar/interstellar Na D absorption line profiles of a sample of 23 Type Ia supernovae (SNe Ia), we determine that theExpand
Optical spectra of supernovae
The temporal evolution of the optical spectra of various types of supernovae (SNe) is illustrated, in part to aid observers classifying supernova candidates. Type II SNe are defined by the presenceExpand
Optical observations of Type II supernovae
I present an overview of optical observations (mostly spectra) of Type II supernovae. SNe II are defined by the presence of hydrogen, and exhibit a very wide variety of properties. SNe II-L tend toExpand
On the nature of the circumstellar medium of the remarkable Type Ia/IIn supernova SN 2002ic
We present results from the first high-resolution, high signal-to-noise ratio spectrum of SN 2002ic. The resolved Ha line has a P Cygni-type profile, clearly demonstrating the presence of a dense,Expand
An asymptotic-giant-branch star in the progenitor system of a type Ia supernova
The presence of strong hydrogen emission associated with the type Ia supernova SN2002ic is reported, indicating the presence of large amounts of circumstellar material, and it is inferred that the progenitor system contained a massive asymptotic-giant-branch star that lost several solar masses of hydrogen-rich gas before the supernova explosion. Expand
Fourteen months of observations of the possible super-Chandrasekhar mass Type Ia Supernova 2009dc
In this paper, we present and analyse optical photometry and spectra of the extremely luminous and slowly evolving Type Ia supernova (SN Ia) 2009dc, and offer evidence that it is aExpand
The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star
It is shown that the high-redshift supernova SNLS-03D3bb has an exceptionally high luminosity and low kinetic energy that both imply a super-Chandrasekhar-mass progenitor, which may provide an explanation for the observed trend that overluminous type Ia supernovae occur only in ‘young’ environments. Expand
Circumstellar interaction of the type Ia supernova 2002ic
We propose a model to account for the bolometric light curve, quasi-continuum and the Ca ii emission features of the peculiar type Ia supernova (SN) 2002ic, which exploded in a dense circumstellarExpand