Now showing items 21-40 of 78

  • Dark energy and thermonuclear supernovae 

    Domínguez, Inmaculada; Bravo Guil, Eduardo; Piersanti, L.; Tornambé, A.; Straniero, O.; Höfflich, P. (Ulla, A.; Manteiga, M. / Real Sociedad Española de Física, 2007)
    Conference report
    Open Access
    Nowadays it is widely accepted that the current Universe is dominated by dark energy and exotic matter, the so called StandardModel of Cosmoloy or _CDM model. All the available data (Thermonuclear Supernovae, Cosmic Microwave ...
  • Detailed spectral modeling of a three-dimensional pulsating reverse detonation model: Too much nickel 

    Baron, E; Jeffery, D J; Branch, D; Bravo Guil, Eduardo; García Senz, Domingo; Hauschildt, P H (2008-01)
    Article
    Restricted access - publisher's policy
    We calculate detailed non-LTE synthetic spectra of a pulsating reverse detonation (PRD) model, a novel explosion mechanism for Type Ia supernovae. While the hydro models are calculated in three dimensions, the spectra use ...
  • 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 ...
  • Evidence for a sub-Chandrasekhar-mass type Ia supernova in the Ursa Minor dwarf galaxys 

    McWilliam, Andrew; Piro, Anthony; Badenes, Carles; Bravo Guil, Eduardo (2018-04-19)
    Article
    Open Access
    A long-standing problem is identifying the elusive progenitors of Type Ia supernovae (SNe Ia), which can roughly be split into Chandraksekhar and sub-Chandrasekhar-mass events. An important difference between these two ...
  • 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 ...) ...
  • Exploring the physics of type Ia supernovae through the x-ray spectra of their remnants 

    Badenes Montoliu, Carles; Borkowski, K.; Bravo Guil, Eduardo; Hughes, J.P.; Hwang, U. (Istituto Nazionale di Astrofisica, 2005-10)
    Article
    Open Access
    We present the results of an ongoing project to use the X-ray observations of Type Ia Supernova Remnants to constrain the physical processes involved in Type Ia Supernova explosions. We use the Tycho Supernova Remnant (SN ...
  • Explosion of white dwarfs harboring hybrid CONe cores 

    Bravo Guil, Eduardo; Gil Pons, Pilar; Gutiérrez Cabello, Jordi; Doherty, Carolyn L. (EDP Sciences, 2016-04-12)
    Article
    Open Access
    Recently, it has been found that off-center carbon burning in a subset of intermediate-mass stars does not propagate all the way to the center, resulting in a class of hybrid CONe cores. The implications of a significant ...
  • Gamma-ray emission from SN2014J near maximum optical light 

    Isern Vilaboy, Jordi; Jean, Pierre; Bravo Guil, Eduardo; Knodlseder, Jurgen; Lebrun, François; Churazov, Eugene; Sunyaev, Rashid; Domingo, Alberto; Badenes, Carles; Hartmann, Dieter, H; Hoeflich, Peter; Renaud, Matthieu; Soldi, Simona; Elias Rosa, Nancy; Hernanz Carbó, Margarita; Domínguez Aguilera, Inmaculada; García Senz, Domingo; Lichti, G.G.; Vedrenne, G.; Von Ballmoos, Peter (EDP Sciences, 2016-04)
    Article
    Open Access
    Context. The optical light curve of Type Ia supernovae (SNIa) is powered by thermalized gamma-rays produced by the decay of 56Ni and 56Co, the main radioactive isotopes synthesized by the thermonuclear explosion of a C/O ...
  • 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 rays from Type Ia supernova SN 2014j 

    Churazov, Eugene; Sunyaev, Rashid; Isern Vilaboy, Jordi; Bikmaev, I; Bravo Guil, Eduardo; Chugai, Nikolai; Grebenev, Sergei; Jean, Pierre; Knodlseder, Jurgen; Lebrun, François; Kuulkers, Eric (2015-10-08)
    Article
    Open Access
    The whole set of INTEGRAL observations of Type Ia supernova SN 2014J, covering the period 19–162 days after the explosion, has been analyzed. For spectral fitting the data are split into early and late periods covering ...
  • 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-temperature combustion: Approaching equilibrium using nuclear networks 

    Cabezón Gómez, Rubén Martín; García Senz, Domingo; Bravo Guil, Eduardo (2004-04)
    Article
    Restricted access - publisher's policy
  • Hypersonic collision of a blast wave on a low-mass star 

    García Senz, Domingo; Serichol Augué, Núria; Bravo Guil, Eduardo (2001-03)
    Article
    Open Access
    When a neutron star is born as a result of the accretion-induced collapse (AIC) of a white dwarf, a small but signi_cant fraction of its mass can be simultaneously expelled at a velocity of around 104 kms −1. In this paper ...
  • Insights into thermonuclear supernovae from the incomplete Si-burning process 

    Bravo Guil, Eduardo (2013-01-21)
    Article
    Open Access
    Type Ia supernova (SNIa) explosions synthesize a few tenths to several tenths of a solar mass, whose composition is the result of incomplete silicon burning that reaches peak temperatures of 4 GK to 5 GK. The elemental ...
  • Interaction of Supernovae remnants: From the circumstellar medium to the terrestrial laboratory 

    Velarde, P; García Senz, Domingo; Bravo Guil, Eduardo; Ogando, F; Relaño, A; Oliva, E (2006-09)
    Article
    Open Access
    The evolution of supernova remnants (SNRs) represents a useful and natural laboratory for gasdynamics studies. In this paper the results of several hydrodynamical simulations of the propagation and early phases of interaction ...
  • Is the metallicity of their host galaxies a good measure of the metallicity of Type Ia supernovae? 

    Bravo Guil, Eduardo; Badenes Montoliu, Carles (2011-06)
    Article
    Open Access
    The efficient use of Type Ia supernovae (SNIa) for cosmological studies requires knowledge of any parameter that can affect their luminosity in either systematic or statistical ways. Observational samples of SNIa commonly ...
  • Measurement of the 58Ni(a, g) 62Zn reaction and its astrophysical impact 

    Quinn, Samantha J.; Spyrou, Artemis; Bravo Guil, Eduardo (2014-05-16)
    Article
    Restricted access - publisher's policy
    Cross section measurements of the 58Ni(a,¿)62Zn reaction were performed in the energy range Ea=5.5to9.5 MeV at the Nuclear Science Laboratory of the University of Notre Dame, using the NSCL Summing NaI(Tl) detector and the ...
  • Metallicity as a Source of Dispersion in the SNIa Bolometric Light Curve Luminosity-width Relationship 

    Bravo Guil, Eduardo; Domínguez, Inmaculada; Badenes Montoliu, Carles; Piersanti, Luciano; Straniero, Oscar (2010-02-18)
    Article
    Restricted access - publisher's policy
    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 ...
  • Neutrino-induced nucleosynthesis of a > 64 nuclei: The vp process 

    Fröhlich, C; Martínez, G; Liebendörfer, M; Thielemann, F -K; Bravo Guil, Eduardo; Hix, W R; Langanke, K; Zinner, N T (2006-04)
    Article
    Open Access
    We present a new nucleosynthesis process that we denote as the νp process, which occurs in supernovae (and possibly gamma-ray bursts) when strong neutrino fluxes create proton-rich ejecta. In this process, antineutrino ...
  • Nucleosynthesis as a result of multiple delayed detonations in Type Ia Supernovae 

    García Senz, Domingo; Bravo Guil, Eduardo (2003-05)
    Article
    Restricted access - publisher's policy
    The explosion of a white dwarf of mass 1.36 M⊙ has been simulated in three dimensions with the aid of a SPH code. The explosion follows the delayed detonation paradigm. In this case the deflagration-detonation transition ...