scholarly journals A minority view on the majority: A personal meeting summary on the explosion mechanism of supernovae

2017 ◽  
Vol 12 (S331) ◽  
pp. 131-140
Author(s):  
Noam Soker
Keyword(s):  
Feedback Mechanism ◽  
Core Collapse ◽  
Negative Feedback Mechanism ◽  
The Core ◽  
Type Ia ◽  
Explosion Mechanism ◽  
Personal Meeting ◽  
Minority View ◽  
Ia Supernovae ◽  
Evolutionary Route

AbstractI present my minority view that the majority (or even all) of core collapse supernovae (CCSNe) are driven by jets rather than by neutrinos, and that the majority of type Ia supernovae (SN Ia) reach their explosion via the core degenerate scenario. New simulations presented at the meeting did not achieve an explosion of CCSNe. I critically examine other arguments that where presented in support of the neutrino-driven model, and present counter arguments that support the jet-driven explosion mechanism. The jets operate via a negative jet feedback mechanism (JFM). The negative feedback mechanism explains the explosion energy being several times the binding energy of the core in most CCSNe. We do not know yet what mechanism explodes massive stars and we do not know yet what evolutionary route leads white dwarfs to explode as SN Ia, and so we must be open to different ideas and critically examine old notions.

WD+AGB star systems as the progenitors of type Ia supernovae

2018 ◽  
Vol 14 (S343) ◽  
pp. 540-541
Author(s):  
Bo Wang
Keyword(s):  
Type Ia Supernovae ◽  
Population Synthesis ◽  
Final Phase ◽  
Common Envelope ◽  
The Core ◽  
Delay Times ◽  
Careful Treatment ◽  
Type Ia ◽  
Ia Supernovae ◽  
Synthesis Approach

AbstractWD+AGB star systems have been suggested as an alternative way for producing type Ia supernovae (SNe Ia), known as the core-degenerate (CD) scenario. In the CD scenario, SNe Ia are produced at the final phase during the evolution of common-envelope through a merger between a carbon-oxygen (CO) WD and the CO core of an AGB secondary. However, the rates of SNe Ia from this scenario are still uncertain. In this work, I carried out a detailed investigation on the CD scenario based on a binary population synthesis approach. I found that the Galactic rates of SNe Ia from this scenario are not more than 20% of total SNe Ia due to more careful treatment of mass transfer, and that their delay times are in the range of ∼90 − 2500 Myr, mainly contributing to the observed SNe Ia with short and intermediate delay times.

scholarly journals A Common Explosion Mechanism for Type Ia Supernovae

Science ◽  
2007 ◽  
Vol 315 (5813) ◽  
pp. 825-828 ◽  
Author(s):  
P. A. Mazzali ◽  
F. K. Ropke ◽  
S. Benetti ◽  
W. Hillebrandt
Keyword(s):  
Type Ia Supernovae ◽  
Type Ia ◽  
Explosion Mechanism ◽  
Ia Supernovae

scholarly journals Type Ia supernovae from dark matter core collapse

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
Ryan Janish ◽  
Vijay Narayan ◽  
Paul Riggins
Keyword(s):  
Dark Matter ◽  
Type Ia Supernovae ◽  
Core Collapse ◽  
Type Ia ◽  
Ia Supernovae

scholarly journals The SED Machine: A Spectrograph to Efficiently Classify Transient Events Discovered by PTF

2012 ◽  
Vol 8 (S290) ◽  
pp. 281-282 ◽  
Author(s):  
Chow-Choong Ngeow ◽  
Nick Konidaris ◽  
Robert Quimby ◽  
Andreas Ritter ◽  
Alexander R. Rudy ◽  
...  
Keyword(s):  
Core Collapse ◽  
California Institute ◽  
California Institute Of Technology ◽  
Lenslet Array ◽  
Type Ia ◽  
Transient Events ◽  
Institute Of Technology ◽  
Ia Supernovae ◽  
The Universe

AbstractThe Palomar Transient Factory (PTF) is a project aimed to discover transients in the Universe, including Type Ia supernovae, core-collapse supernovae, and other exotic and rare transient events. PTF utilizes the Palomar 48-inch Telescope (P48) for discovering the transients, and follow-up mainly by the Palomar 60-inch Telescope (P60, for photometric light and color curves), as well as other telescopes. The discovery rate of PTF is about 7000 candidate transients per year, but currently only about 10% of the candidates are being followed-up and classified. To overcome this shortcoming, a dedicated spectrograph, called the SED Machine, is being designed and built at the California Institute of Technology for the P60 Telescope, aiming to maximize the classification efficiency of transients discovered by PTF. The SED Machine is a low resolution (R ~ 100) IFU spectrograph. It consists of a rainbow camera for spectrophotometric calibration, and a lenslet array plus 3-prism optics system for integrated field spectra. An overview of the science and design of the SED Machine is presented here.

The dividends of investing in computational software design: A case study

2017 ◽  
Vol 33 (2) ◽  
pp. 322-331 ◽  
Author(s):  
Anshu Dubey ◽  
Petros Tzeferacos ◽  
Don Q Lamb
Keyword(s):  
High Energy ◽  
High Energy Density ◽  
Core Collapse ◽  
Fluid Structure Interactions ◽  
Research Areas ◽  
Type Ia ◽  
Scientific Results ◽  
Ia Supernovae ◽  
The Impact

A significant fraction of computational software for scientific research grows through accretion. In a common scenario, a small group develops a code for a specific purpose. Others find the software useful, so they add to it for their own use. The software grows to the point where its management becomes intractable and scientific results obtained from it become unreliable. This is in stark contrast with a small number of scientific codes that have undergone a design process, be it due to an upfront investment, or when haphazardly grown codes have reset and started again. At a minimum, these codes reduce the time to obtain research results for the communities they serve because individual researchers do not have to develop their own codes. They provide further benefits; the results they produce are more reproducible due to greater scrutiny, leading to better science. One of the more overlooked benefits, which is perhaps of greater significance, is that a well-designed code can expand to serve communities beyond the ones it was designed for. Thus, research communities with similar computational requirements can symbiotically improve computation-based research for each other. In this article, we present a case study of FLASH, a code that was designed and developed for simulating thermonuclear runaways such as novae and type Ia supernovae in astrophysics. Designed to be modular and extensible, users from several diverse research areas have added capabilities to it and adapted it for their own communities. Examples include cosmology, high-energy density physics, core-collapse supernovae, star formation, fluid–structure interactions, and chemical combustion. We give a summary of design features that facilitated the expansion and quantify the effort needed to expand into some of the above-mentioned fields. We also quantify the impact on different communities by mining the database of publications using FLASH, collected by its developers.

scholarly journals A UNIFORM CONTRIBUTION OF CORE-COLLAPSE AND TYPE Ia SUPERNOVAE TO THE CHEMICAL ENRICHMENT PATTERN IN THE OUTSKIRTS OF THE VIRGO CLUSTER

2015 ◽  
Vol 811 (2) ◽  
pp. L25 ◽  
Author(s):  
A. Simionescu ◽  
N. Werner ◽  
O. Urban ◽  
S. W. Allen ◽  
Y. Ichinohe ◽  
...  
Keyword(s):  
Virgo Cluster ◽  
Type Ia Supernovae ◽  
Core Collapse ◽  
Chemical Enrichment ◽  
Type Ia ◽  
Ia Supernovae

scholarly journals Nucleosynthesis Constraints on the Explosion Mechanism for Type Ia Supernovae

2018 ◽  
Vol 863 (2) ◽  
pp. 176 ◽  
Author(s):  
Kanji Mori ◽  
Michael A. Famiano ◽  
Toshitaka Kajino ◽  
Toshio Suzuki ◽  
Peter M. Garnavich ◽  
...  
Keyword(s):  
Type Ia Supernovae ◽  
Type Ia ◽  
Explosion Mechanism ◽  
Ia Supernovae

scholarly journals Thermonuclear Supernova Explosions from White Dwarfs in Different Progenitor Systems

2011 ◽  
Vol 7 (S281) ◽  
pp. 261-266
Author(s):  
F. K. Röpke ◽  
S. A. Sim ◽  
M. Fink ◽  
R. Pakmor ◽  
M. Kromer ◽  
...  
Keyword(s):  
White Dwarfs ◽  
Radiation Transfer ◽  
Type Ia Supernovae ◽  
Normal Type ◽  
Type Ia ◽  
Supernova Explosions ◽  
Explosion Mechanism ◽  
Ia Supernovae

AbstractSeveral progenitor scenarios have been suggested for Type Ia supernovae. Here we discuss the consequences for the explosion mechanism and for observables of some of them, which are explored by means of multi-dimensional hydrodynamic and radiation transfer simulations. While the observables predicted from delayed detonations of Chandrasekhar-mass white dwarfs agree reasonably well with the data, the corresponding progenitor systems may be too rare to account for the observed rate of Type Ia supernovae. Several alternatives are investigated of which violent mergers of two white dwarfs and, perhaps, double detonations of sub-Chandrasekhar mass white dwarfs hold promise for reproducing the observables of normal Type Ia supernovae.

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