Project

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Dust synthesis in evolved stellar winds: a local diagnostic for the identification of dust providers in the early universe

Applicant Cherchneff-Parrinello Isabelle
Number 132616
Funding scheme Project funding (Div. I-III)
Research institution Departement Physik Universität Basel
Institution of higher education University of Basel - BS
Main discipline Astronomy, Astrophysics and Space Sciences
Start/End 01.02.2011 - 31.01.2014
Approved amount 158'864.00
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Keywords (9)

Dust; AGB stars; Supergiants; Quasars; Diffuse Interstellar Bands; Early universe; LMC/SMC; low-mass stars; molecules

Lay Summary (English)

Lead
Lay summary
The project aims at studying the dust formation processes in the winds of evolved low- and high- mass stars to provide insight on the way dust is formed and processed in our local universe and at high redshift. A novel approach to dust synthesis based on a chemical kinetics, a sequential lump growth and/or stochastic description of the nucleation and condensation of dust is used. The objectives are the derivation of dust mass yields and a prescription for the dust chemical composition and size distribution per type of objects and at various metallicities to assess the dust formation budget on a broad scale. Specific stellar objects will include carbon stars (e.g., IRC+10216), oxygen-rich supergiants (e.g., VY Cma), and evolved massive stars (e.g., the LBV Eta Carinae).
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Water in IRC+10216: a genuine formation process by shock-induced chemistry in the inner wind
Cherchneff Isabelle (2011), Water in IRC+10216: a genuine formation process by shock-induced chemistry in the inner wind, in Astronomy & Astrphysics, 526(L11), 1-5.
The inner wind of IRC+10216 revisited: new exotic chemistry and diagnostic for dust condensation in carbon stars
Cherchneff Isabelle, The inner wind of IRC+10216 revisited: new exotic chemistry and diagnostic for dust condensation in carbon stars, in Astronomy & Astrophysics.

Collaboration

Group / person Country
Types of collaboration
University of Barcelona Spain (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
University of Bonn Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
University of Uppsala Sweden (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
The life cycle of dust in the universe Poster Dust and molecules in IK Tau’s inner wind 18.11.2013 Taipei, China Gobrecht David Leon;
The deaths of stars and the lives of galaxies Talk given at a conference Physics and chemistry of dust production 08.04.2013 ESO - Santiago, Chile Cherchneff-Parrinello Isabelle;
Betelgeuse 2012 Talk given at a conference  The chemistry of dust formation in red supergiants 26.11.2012 Paris, France Cherchneff-Parrinello Isabelle;
Dust in EuroGENESIS environments: from primitive, massive stars to novae Talk given at a conference Dust in AGB stars 12.11.2012 Perugia, Italy, Italy Gobrecht David Leon;
The astrochemical universe unveiled with Herschel, EWASS 2012 Poster Silicate production in the inner wind of IK Tau 02.07.2012 Rome, Italy Gobrecht David Leon;
The Warm Universe - Astrochemistry at Intermediate and Elevated Temperatures”. COST network “The chemical cosmos Poster Silicate production in the inner wind of IK Tau 29.05.2012 Tallinn, Estonia, Estonia Gobrecht David Leon;
Physical and chemical aspects of late stages of stellar evolution Talk given at a conference Non equilibrium chemistry in the shocked inner wind of AGB stars 29.08.2011 Warszawa, Poland Cherchneff-Parrinello Isabelle;


Associated projects

Number Title Start Funding scheme
149190 Forming cosmic dust in low- and high-mass, evolved stars 01.02.2014 Project funding (Div. I-III)
128950 CoDustMas: Cosmic Dust Grains as a Diagnostic for Massive Stars 01.09.2010 Project funding (special)
149248 CoDustMas: Cosmic Dust as a Diagnostic for Massive Stars - prolongation request 01.10.2013 Project funding (Div. I-III)
149190 Forming cosmic dust in low- and high-mass, evolved stars 01.02.2014 Project funding (Div. I-III)

Abstract

This proposal aims at studying the dust formation processes in the wind of a variety of low- and high-mass evolved stellar objects to provide insight on the way dust is formed and processed in our local universe and at high redshift. A novel approach to dust synthesis based on a chemical kinetic and a stochastic description of the nucleation and the condensation of dust is used. We aim at deriving dust yields per type of objects and at various metallicities to assess the dust formation budget on a broad scale. These environments include the red giant stars, supergiants, and quasars, as well as proto-planetary nebulae and R CrB stars. For low-mass stars, we will provide clues on important issues such as: (1) the processes spawning the synthesis of molecules and dust in oxygen- and carbon-rich red giants stars with the derivation of dust yields as a function of stellar evolution along the Asymptotic Giant Branch; (2) the derivation of dust yields for low-mass stars at low and very-low metallicities to assess the contribution of low-mass stars to the dust observed at redshift = 6; and (3) the identification of the carriers of the Diffuse Interstellar Bands, an unsolved problem in astronomy since 1930 by modelling the synthesis of dust in the R CrB star V854 Cen and the post-AGB object named the Red Rectangle nebula. For high-mass stars, we will model the dust synthesis chemistry in the wind of supergiants and in the Broad Line Emission regions of quasars. Here, the goals are threefold: (1) the derivation of dust yields for specific well-studied local systems such as the supergiant VY Cma; (2) the extension of these results to low and very-low metallicities to assess the contribution of these evolved massive objects to the dust budget in the early universe; and (3) the assessment of quasars as potential dust producers in their distant host galaxies.
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