A non-spherical core in the explosion of supernova SN 2004dj

  title={A non-spherical core in the explosion of supernova SN 2004dj},
  author={Douglas C. Leonard and Alexei V. Filippenko and Mohan Ganeshalingam and Frank J. D. Serduke and Weidong Li and Brandon J. Swift and Avishay Gal-yam and Ryan J. Foley and Derek B. Fox and Sung Park and Jennifer L. Hoffman and Diane Sonya Wong},
An important and perhaps critical clue to the mechanism driving the explosion of massive stars as supernovae is provided by the accumulating evidence for asymmetry in the explosion. Indirect evidence comes from high pulsar velocities, associations of supernovae with long-soft γ-ray bursts, and asymmetries in late-time emission-line profiles. Spectropolarimetry provides a direct probe of young supernova geometry, with higher polarization generally indicating a greater departure from spherical… 
Impact of clumping on core-collapse supernova radiation
There is both observational and theoretical evidence that the ejecta of core-collapse supernovae (SNe) are structured. Rather than being smooth and homogeneous, the material is made of over-dense and
Polarimetry as a window into supernova explosions and progenitors
  • J. Hoffman
  • Physics
    Proceedings of the International Astronomical Union
  • 2014
Abstract Supernovae of all types exhibit time-dependent spectropolarimetric signatures produced primarily by electron scattering. These reveal the presence of aspherical and variable phenomena such
Large Late-Time Asphericities in Three Type IIP Supernovae
Type II-plateau supernovae (SNe IIP) are the results of the explosions of red supergiants and are the most common subclass of core-collapse supernovae. Past observations have shown that the outer
Spectropolarimetry of Supernovae
Overwhelming evidence has accumulated in recent years that supernova explosions are intrinsically three-dimensional phenomena with significant departures from spherical symmetry. We review the
Progenitors of Core-Collapse Supernovae
Knowledge of the progenitors of core-collapse supernovae is a fundamental component in understanding the explosions. The recent progress in finding such stars is reviewed. The minimum initial mass
Asphericity in Supernova Explosions from Late-Time Spectroscopy
It is suggested that all CC-SNe from stripped-envelope stars are aspherical explosions and that SNe accompanied by GRBs exhibit the highest degree of asphericity.
Type IIP Supernovae
In this chapter concerns supernovae of Type IIP (SN IIP), the spectra of which contain conspicuous lines of hydrogen at all epochs. After a brief, bright, and as-yet-unobserved phase of shock
Dust and the Type II-Plateau Supernova 2004et
We present mid-infrared (MIR) observations of the Type II-plateau supernova (SN) 2004et, obtained with the Spitzer Space Telescope between 64 and 1406 days past explosion. Late-time optical spectra
The difficulty of inferring progenitor masses from type-II-Plateau supernova light curves
Much controversy surrounds the inferred progenitor masses of type-II-Plateau (II-P) supernovae (SNe). The debate is nourished by the discrepant results from radiation-hydrodynamics simulations,
Aspherical Supernovae: Effects on Early Light Curves
Early light from core-collapse supernovae, now detectable in high-cadence surveys, holds clues to a star and its environment just before it explodes. However, effects that alter the early light have


An Asymmetric Energetic Type Ic Supernova Viewed Off-Axis, and a Link to Gamma Ray Bursts
Recent Subaru and Keck spectra reveal double-peaked profiles in the nebular lines of neutral oxygen and magnesium, different from those of known type Ic supernovae, with or without a gamma ray burst, and they can be understood if SN 2003jd was an aspherical axisymmetric explosion viewed from near the equatorial plane.
Optical observations of type-IIP supernova 2004dj: Evidence for asymmetry of the 56Ni ejecta
Photometric and spectroscopic observations of the nearby type-IIP supernova 2004dj are presented. The 56Ni mass in the envelope of SN 2004dj was estimated from the light curve to be ≈0.02M⊙. This
On the Progenitor of the Type II Supernova 2004et in NGC 6946
Supernova (SN) 2004et is the eighth historical SN in the nearby spiral galaxy NGC 6946. Here we report on early photometric and spectroscopic monitoring of this object. SN 2004et is a Type II event,
Theoretical light curve of a Type 2p supernova
The light curve and other observable diagnostics are presented for what should be a typical Type II 'plateau' supernova, the explosion of a 15 solar mass red supergiant. The calculations are carried
Is It Round? Spectropolarimetry of the Type II-p Supernova 1999em
We present the first multiepoch spectropolarimetry of a Type II plateau supernova (SN II-P), with optical observations of SN 1999em on days 7, 40, 49, 159, and 163 after discovery. These data are
Asymmetric Supernovae from Magnetocentrifugal Jets
Strong toroidal magnetic fields generated in stellar collapse can generate magnetocentrifugal jets in analogy to those found in simulations of black hole accretion. Magnetocentrifugal jets may
Getting its kicks: A VLBA parallax for the hyperfast pulsar B1508+55
The highest velocity neutron stars establish stringent constraints on natal kicks, asymmetries in supernova core collapse, and the evolution of close binary systems. Here we present the first results
Evidence for Spectropolarimetric Diversity in Type Ia Supernovae
We present single-epoch, postmaximum spectropolarimetry of four Type Ia supernovae (SNe Ia) that span a range of spectral and photometric properties: SN 2002bf and SN 2004dt exhibit unusually
The progenitor of Type II-P (P p plateau) supernova SN 2004dj is identified with a supergiant in a compact star cluster known as “Sandage’s star 96” (S96) in the nearby spiral galaxy NGC 2403, which
Explosive Nucleosynthesis in Aspherical Hypernova Explosions and Late-Time Spectra of SN 1998bw
Aspherical explosion models for the hypernova (hyperenergetic supernova) SN 1998bw are presented. Nucleosynthesis in aspherical explosions is examined with a two-dimensional hydrodynamical code and a