DSpace DSpace UPC
 Català   Castellano   English  

E-prints UPC >
Altres >
Enviament des de DRAC >

Empreu aquest identificador per citar o enllaçar aquest ítem: http://hdl.handle.net/2117/6517

Ítem no disponible en accés obert per política de l'editorial

Arxiu Descripció MidaFormat
apjl_711_2_66.pdfArticle principal269,72 kBAdobe PDF Accés restringit

Citació: Bravo, E. [et al.]. Metallicity as a Source of Dispersion in the SNIa Bolometric Light Curve Luminosity-width Relationship. "The astrophysical journal letters", 18 Febrer 2010, vol. 711, p. L66-L70.
Títol: Metallicity as a Source of Dispersion in the SNIa Bolometric Light Curve Luminosity-width Relationship
Autor: Bravo Guil, Eduardo Veure Producció científica UPC; Domínguez, Inmaculada; Badenes Montoliu, Carles Veure Producció científica UPC; Piersanti, Luciano; Straniero, Oscar
Data: 18-feb-2010
Tipus de document: Article
Resum: The recognition that the metallicity of Type Ia supernova (SNIa) progenitors might bias their use for cosmological applications has led to an increasing interest in its role in shaping SNIa light curves. We explore the sensitivity of the synthesized mass of 56Ni, M(56Ni), to the progenitor metallicity starting from pre-main-sequence models with masses M0 = 2–7 M_ and metallicities Z = 10−5–0.10. The interplay between convective mixing and carbon burning during the simmering phase eventually raises the neutron excess, η, and leads to a smaller 56Ni yield, but does not change substantially the dependence of M(56Ni) on Z. Uncertain attributes of the progenitor white dwarf, like the central density, have a minor effect on M(56Ni). Our main results are: (1) a sizeable amount of 56Ni is synthesized during incomplete Si-burning, which leads to a stronger dependence of M(56Ni) on Z than obtained by assuming that 56Ni is produced in material that burns fully to nuclear statistical equilibrium; (2) in onedimensional delayed detonation simulations a composition dependence of the deflagration-to-detonation transition (DDT) density gives a nonlinear relationship betweenM(56Ni) and Z and predicts a luminosity larger than previously thought at low metallicities (however, the progenitor metallicity alone cannot explain the whole observational scatter of SNIa luminosities); and (3) an accurate measurement of the slope of the Hubble residuals versus metallicity for a large enough data set of SNIa might give clues to the physics of DDT in thermonuclear explosions.
URI: http://hdl.handle.net/2117/6517
DOI: 10.1088/2041-8205/711/2/L66
Versió de l'editor: http://www.iop.org/EJ/abstract/2041-8205/711/2/L66/
Apareix a les col·leccions:GAA - Grup d'Astronomia i Astrofísica. Articles de revista
Departament de Física i Enginyeria Nuclear. Articles de revista
Altres. Enviament des de DRAC
Comparteix:


Stats Mostra les estadístiques d'aquest ítem

SFX Query

Aquest ítem (excepte textos i imatges no creats per l'autor) està subjecte a una llicència de Creative Commons Llicència Creative Commons
Creative Commons

 

Valid XHTML 1.0! Programari DSpace Copyright © 2002-2004 MIT and Hewlett-Packard Comentaris
Universitat Politècnica de Catalunya. Servei de Biblioteques, Publicacions i Arxius