Observational evidence for mixing and dust condensation in core-collapse supernovae

1997 ◽  
Author(s):  
Diane H. Wooden
Keyword(s):  
Observational Evidence ◽  
Core Collapse ◽  
Dust Condensation

scholarly journals Supernovae and Gamma-ray Bursts

2011 ◽  
Vol 7 (S279) ◽  
pp. 75-82
Author(s):  
Paolo A. Mazzali
Keyword(s):  
Black Hole ◽  
Massive Star ◽  
Gamma Ray ◽  
Massive Stars ◽  
Observational Evidence ◽  
Gamma Ray Bursts ◽  
Core Collapse ◽  
Broad Absorption ◽  
X Ray ◽  
Long Duration

AbstractThe properties of the Supernovae discovered in coincidence with long-duration Gamma-ray Bursts and X-Ray Flashes are reviewed, and compared to those of SNe for which GRBs are not observed. The SNe associated with GRBs are of Type Ic, they are brighter than the norm, and show very broad absorption lines in their spectra, indicative of high expansion velocities and hence of large explosion kinetic energies. This points to a massive star origin, and to the birth of a black hole at the time of core collapse. There is strong evidence for gross asymmetries in the SN ejecta. The observational evidence seems to suggest that GRB/SNe are more massive and energetic than XRF/SNe, and come from more massive stars. While for GRB/SNe the collapsar model is favoured, XRF/SNe may host magnetars.

Probes of the progenitors, engines and physics behind stellar collapse

2021 ◽  
Author(s):  
Chris L. Fryer
Keyword(s):  
Neutron Star ◽  
Power Source ◽  
Observational Evidence ◽  
Observational Constraints ◽  
Core Collapse ◽  
Stellar Core ◽  
Stellar Collapse ◽  
Current Paradigm ◽  
The Universe

Super-novas (SNs) are one of the most powerful explosions in the universe and astronomers have invoked the collapse of a stellar core down to a neutron star as a potential power source behind these cosmic blasts. The current paradigm behind core-collapse SN relies on convection in the region just above the newly formed neutron star. This engine was driven and confirmed by observations. We review this observational evidence, and the potential for further observational constraints in this paper.

scholarly journals Optical, Ultraviolet, and Infrared Observations of SN 1993J

2005 ◽  
Vol 192 ◽  
pp. 37-46
Author(s):  
Alexei V. Filippenko ◽  
Thomas Matheson
Keyword(s):  
Spectral Type ◽  
Strong Evidence ◽  
Observational Evidence ◽  
Optical Data ◽  
Core Collapse ◽  
Late Time ◽  
Type Ii ◽  
Infrared Observations ◽  
Circumstellar Material ◽  
Circumstellar Gas

SummaryWe review the existing set of optical/UV/IR observations of Supernova 1993J, concentrating heavily on optical data because these are by far the most plentiful. Some results from theoretical modeling of the observations are also discussed. SN 1993J has provided the best observational evidence for the transformation of a SN from one spectral type to another, thereby providing a link between Type II and Type Ib supernovae (SNe). This has strengthened the argument that SNe Ib (and, by extension, SNe Ic) are core-collapse events. SN 1993J has remained relatively bright for 10 years; its late-time emission comes from the collision of supernova ejecta with circumstellar gas that was released by the progenitor prior to the explosion. The circumstellar material shows strong evidence of CNO processing.

Peculiarity Parameters

1976 ◽  
Vol 32 ◽  
pp. 233-254
Author(s):  
H. M. Maitzen
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Theoretical Work ◽  
Observational Evidence ◽  
Rotator Model ◽  
Peculiar Behaviour ◽  
Field Spectrum ◽  
Oblique Rotator ◽  
Ap Stars ◽  
The Way

Ap stars are peculiar in many aspects. During this century astronomers have been trying to collect data about these and have found a confusing variety of peculiar behaviour even from star to star that Struve stated in 1942 that at least we know that these phenomena are not supernatural. A real push to start deeper theoretical work on Ap stars was given by an additional observational evidence, namely the discovery of magnetic fields on these stars by Babcock (1947). This originated the concept that magnetic fields are the cause for spectroscopic and photometric peculiarities. Great leaps for the astronomical mankind were the Oblique Rotator model by Stibbs (1950) and Deutsch (1954), which by the way provided mathematical tools for the later handling pulsar geometries, anti the discovery of phase coincidence of the extrema of magnetic field, spectrum and photometric variations (e.g. Jarzebowski, 1960).

The effect of aerosols on fog lifetime: observational evidence and model simulations

2020 ◽  
Author(s):  
Shuqi Yan ◽  
Bin Zhu ◽  
Tong Zhu ◽  
Chune Shi ◽  
Duanyang Liu ◽  
...  
Keyword(s):  
Observational Evidence ◽  
Model Simulations

scholarly journals Turbulence Generation by Shock-Acoustic-Wave Interaction in Core-Collapse Supernovae

Particles ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 7 ◽  
Author(s):  
Ernazar Abdikamalov ◽  
César Huete ◽  
Ayan Nussupbekov ◽  
Shapagat Berdibek
Keyword(s):  
Acoustic Wave ◽  
Wave Interaction ◽  
Core Collapse ◽  
Turbulence Generation

scholarly journals The Observational Evidence for Accretion

1997 ◽  
Vol 182 ◽  
pp. 391-405 ◽  
Author(s):  
Lee Hartmann
Keyword(s):  
Large Range ◽  
Observational Evidence ◽  
Young Stars ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
T Tauri ◽  
Accretion Rates ◽  
Low Mass ◽  
Stellar Magnetospheres ◽  
Mass Ejection

Outflows from low-mass young stellar objects are thought to draw upon the energy released by accretion onto T Tauri stars. I briefly summarize the evidence for this accretion and outline present estimates of mass accretion rates. Young stars show a very large range of accretion rates, and this has important implications for both mass ejection and for the structure of stellar magnetospheres which may truncate T Tauri disks.

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