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Carbon dust in core-collapse supernovae: formation processes and identification of the DIBs carriers

English title Carbon dust in core-collapse supernovae: formation processes and identification of the DIBs carriers
Applicant Cherchneff-Parrinello Isabelle
Number 124159
Funding scheme Marie Heim-Voegtlin grants
Research institution Departement Physik Universität Basel
Institution of higher education University of Basel - BS
Main discipline Astronomy, Astrophysics and Space Sciences
Start/End 01.01.2009 - 31.12.2009
Approved amount 108'735.00
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Keywords (5)

Supernova; Dust and molecules; Diffuse Interstellar Bands; Astrochemistry; RCrB star

Lay Summary (English)

Lead
Lay summary
Core-collapse Supernovae (CCSNe) have long been proposed as major dust providers to galaxies. However, observations have not yet confirmed this hypothesis. We study the ejecta composition of a 20 solar masses supernova based on a chemical kinetic approach including the formation of molecules and dust precursors from the gas phase. Various mixing levels of hydrogen with heavy elements are considered. Of particular interest is the formation of carbon grains in CCSNe. The two carbon condensation routes via PAHs and carbon chains will be investigated.Such study on dust in supernovae will highlight the importance of certain chemical routes to the formation of carbon dust in a high temperature, H-poor, He-rich medium. We will use these results to study the formation of carbon dust in the RCrB star V854 Cen, to help identifying the nature of the Diffuse Interstellar Bands (DIBs) carriers.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Associated projects

Number Title Start Funding scheme
128950 CoDustMas: Cosmic Dust Grains as a Diagnostic for Massive Stars 01.09.2010 Project funding (special)
114347 Dust Formation in Primordial Supernova 01.01.2007 Marie Heim-Voegtlin grants

Abstract

Core-collapse Supernovae (CCSNe) have long been proposed as major dust providers to galaxies. However, observations have not yet confirmed this hypothesis. We study the ejecta composition of a 20 solar masses supernova based on a chemical kinetic approach including the formation of molecules and dust precursors from the gas phase. Mixing of hydrogen and heavy elements is a key parameter to discriminate between carbon or silicate/metal oxide dust. The derived molecular content and dust amounts are compared to new observations with Spitzer. Our previous study on primordial supernovae highlights the importance of certain chemical routes to the formation of carbon dust in a high temperature, H-poor, He-rich medium. We use these results to study the formation of carbon dust in the RCrB star V854 Cen, to help identifying the nature of the Diffuse Interstellar Bands (DIBs) carriers.
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