Now showing items 1-20 of 36

  • A new kind of type I supernovae? 

    Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Domínguez, Inmaculada (Istituto Nazionale di Astrofisica, 2000-12)
    Article
    Open Access
    In this paper we examine the consequences of the propagation of a slow deflagration front through a C-0 white dwarf that leads to the formation of a marginally bound remnant. This situation corresponds to the transition ...
  • Binary systems and their nuclear explosions 

    Isern Vilaboy, Jordi; Hernanz Carbó, Margarita; José Pont, Jordi (2011-01)
    Part of book or chapter of book
    Restricted access - publisher's policy
  • Bounds on the possible evolution of the gravitational constant from cosmological type-Ia supernovae 

    Gaztañaga, E.; García-Berro Montilla, Enrique; Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Domínguez, Inmaculada (2002-01)
    Article
    Open Access
    Recent high-redshift type-Ia supernovae results can be used to set new bounds on a possible variation of the gravitational constant G. If the local value of G at the space-time location of distant supernovae is different, ...
  • Clues to type ia supernovae progenitors from degenerate carbon ignition models 

    Bravo Guil, Eduardo; Tornambé, A; Domínguez, Inmaculada; Isern Vilaboy, Jordi (1996-04)
    Article
    Open Access
  • Cobalt-56 gamma-ray emission lines from the type Ia supernova 2014J 

    Churazov, Eugene; Sunyaev, Rashid; Isern Vilaboy, Jordi; Knodlseder, Jurgen; Jean, Pierre; Lebrun, François; Chugai, Nikolai; Grebenev, Sergei; Bravo Guil, Eduardo; Sazonov, Sergei; Renaud, Matthieu (2014-08-28)
    Article
    Restricted access - publisher's policy
    A type Ia supernova is thought to be a thermonuclear explosion of either a single carbon–oxygen white dwarf or a pair of merging white dwarfs. The explosion fuses a large amount of radioactive 56Ni. After the explosion, ...
  • Detection and interpretation of gamma-ray emission from SNIa 

    Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Hirschmann, Alina (2008-10)
    Article
    Restricted access - publisher's policy
    The explosion mechanism associated with thermonuclear supernovae (SNIa) is still a matter of debate. Nevertheless, there is a wide agreement that large amounts of radioactive nuclei are produced during these events, which ...
  • Detonations in white dwarf dynamical interactions 

    Aznar Siguan, Gabriela; García-Berro Montilla, Enrique; Lorén Aguilar, Pablo; José Pont, Jordi; Isern Vilaboy, Jordi (2013)
    Article
    Open Access
    n old, dense stellar systems collisions of white dwarfs are a rather frequent phenomenon. Here we present the results of a comprehensive set of Smoothed Particle Hydrodynamics simulations of close encounters of white ...
  • Double degenerate mergers as progenitors of high-field magnetic white dwarfs 

    García-Berro Montilla, Enrique; Lorén Aguilar, Pablo; Aznar Siguan, Gabriela; Torres Gil, Santiago; Camacho Díaz, Judit; Althaus, Leandro Gabriel; Córsico, Alejando Hugo; Kulebi, Baybar; Isern Vilaboy, Jordi (2011-04-10)
    Article
    Open Access
    High-field magnetic white dwarfs have been long suspected to be the result of stellar mergers. However, the nature of the coalescing stars and the precise mech anism that produces the magnetic field are still unknown. ...
  • Exploding stars: the gamma-ray signature of type Ia supernovae 

    Isern Vilaboy, Jordi; Gomez, J.; Bravo Guil, Eduardo (Istituto Nazionale di Astrofisica, 1996-12)
    Article
    Open Access
    Type Ia supenovae are commonly thought to be the outcome of the thermonuclear explosion of a white dwarf in a binary system. Nevertheless, there is no agreement on the scenarios (double degenerates, symbiotics stars ...) ...
  • Gamma-ray emission from type Ia supernovae 

    Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Hirschmann, Alina; García Senz, Domingo (2004-02)
    Article
    Restricted access - publisher's policy
    The explosion mechanism associated with thermonuclear supernovae is still a matter of debate. Since huge amounts of radioactive elements are synthesized during such explosions, it is possible to use the associated γ-ray ...
  • Gamma-ray spectrum of type Ia supernovae 

    Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Gómez, J.; García Senz, Domingo; Jean, Pierre (1999-12)
    Article
    Restricted access - publisher's policy
    The explosion mechanism associated with thermonuclear supernovae (SNia) is still a matter of debate. In this paper we examine the 'f-ray emission of the radioactive debris predicted by the different theoretícal models ...
  • High-proper-motion white dwarfs and halo dark matter 

    Torres Gil, Santiago; García-Berro Montilla, Enrique; Burkert, Andreas; Isern Vilaboy, Jordi (Blackwell, 2002-11)
    Article
    Open Access
    The interpretation of the old, cool white dwarfs recently found by Oppenheimer et al. is still controversial. Whereas these authors claim that they have finally found the elusive ancienthalo white dwarf population that ...
  • High-resolution smoothed particle hydrodynamics simulations of the merger of binary white dwarfs 

    Lorén Aguilar, Pablo; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (2009-06)
    Article
    Open Access
    Context. The coalescence of two white dwarfs is the final outcome of a sizeable fraction of binary stellar systems. Moreover, this process has been proposed to explain several interesting astrophysical phenomena. Aims. ...
  • Nucleosynthesis during the merger of white dwarfs and the origin of R Coronae Borealis stars 

    Longland, Richard Leigh; Lorén Aguilar, Pablo; José Pont, Jordi; García-Berro Montilla, Enrique; Althaus, Leandro Gabriel; Isern Vilaboy, Jordi (2011-08-20)
    Article
    Restricted access - publisher's policy
    Many hydrogen-deficient stars are characterized by surface abundance patterns that are hard to reconcile with conventional stellar evolution. Instead, it has been suggested that they may represent the result of a merger ...
  • Observation of SN2011fe with INTEGRAL - I : pre-maximum phase 

    Isern Vilaboy, Jordi; Jean, Pierre; Bravo Guil, Eduardo; Diehl, Roland; Knödlseder, Jurgen; Domingo, A.; Hirschmann, Alina; Hoeflich, Peter; Lebrun, F.; Renaud, M.; Soldi, Simona; Elias-Rosa, Nancy; Hernanz Carbó, Margarita; Kulebi, Baybar; Zhang, X.; Badenes Montoliu, Carles; Domínguez, Inmaculada; García Senz, Domingo; Jordi, Carme; Lichti, G.; Vedrenne, G.; von Ballmoos, Peter (2013-04)
    Article
    Open Access
    Context. SN2011fe was detected by the Palomar Transient Factory in M101 on August 24, 2011, a few hours after the explosion. From the early optical spectra it was immediately realized that it was a Type Ia supernova, thus ...
  • On the internal composition of white dwarfs 

    Isern Vilaboy, Jordi; Bravo Guil, Eduardo; García-Berro Montilla, Enrique; Domínguez, Inmaculada; Salaris, M. (2001-05)
    Article
    Restricted access - publisher's policy
  • On the origin of high-field magnetic white dwarfs 

    García-Berro Montilla, Enrique; Torres Gil, Santiago; Loren Aguilar, Pablo; Aznar Siguan, Gabriela; Camacho Díaz, Judit; Kulebi, Baybar; Isern Vilaboy, Jordi; Althaus, Leandro Gabriel; Corsico, Alejandro H. (Astronomical Society of the Pacific, 2013-01-01)
    Conference lecture
    Open Access
    Every two years, white dwarf researchers and enthusiasts meet to exchange their knowledge and discuss recent developments in white dwarf theory and observations. These proceedings are from the 18th European White Dwarf ...
  • On the photometric homogeneity of type IA supernovae 

    Bravo Guil, Eduardo; Domínguez, Inmaculada; Isern Vilaboy, Jordi; Canal Corretger, Ramon; Höflich, P.; Labay, Javier (1993-03)
    Article
    Open Access
    The dependence of the characteristics of the light curves of Type Ia supernovae on the ignition density of the progenitor white dwarf is studied with the aid of two models of propagation of the thermonuclear burning front: ...
  • Oxygen neutronization in accreting white dwarfs 

    Bravo Guil, Eduardo; Isern Vilaboy, Jordi; Labay, Javier; Canal Masgoret, Ramon (1983)
    Article
    Open Access
    Solid carbon-oxygen white dwarf cores have been shown to be likely initial configurations for collapse to neutron star densities. Solidification seems to entail carbon/oxygen separation, with oxygen settling at the star's ...
  • SIXE: A Payload for MINISAT-02 

    Gómez, J.; Isern Vilaboy, Jordi; Bravo Guil, Eduardo; Giovannelli, F.; Padula, C.L. (1998-01)
    Article
    Restricted access - publisher's policy
    A description of the X-ray instrument SIXE proposed for the MINISAT-02 mission is presented. The description includes the scientific goals and instrument performances.