GAA - Grup d'Astronomia i Astrofísica: Recent submissions

Now showing items 1-12 of 278

    • Search for nova presolar grains: gamma-ray Spectroscopy of Ar-34 and its relevance for the astrophysical Cl-33(p,gamma) reaction 

      José Pont, Jordi (American Institute of Physics (AIP), 2020-06-26)
      Article
      Open Access
      The discovery of presolar grains in primitive meteorites has initiated a new era of research in the study of stellar nucleosynthesis. However, the accurate classification of presolar grains as being of specific stellar ...

    • Low-energy( 23)Al beta-delayed proton decay and Na-22 destruction in novae 

      Perez Loureiro, David; Wrede, Christopher; José Pont, Jordi (American Physical Society (APS), 2020-05-19)
      Article
      Open Access
      The radionuclide22Na is a target of¿-ray astronomy searches, predicted to be produced during thermonuclearrunaways driving classical novae. The22Na(p,¿)23Mg reaction is the main destruction channel of22Na during anova, ...

    • Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye 

      Rebassa Mansergas, Alberto (EDP Sciences, 2020-01-21)
      Article
      Open Access
      Gaia16aye was a binary microlensing event discovered in the direction towards the northern Galactic disc and was one of the first microlensing events detected and alerted to by the Gaia space mission. Its light curve ...

    • Experimentally well-constrained masses of 27P and 27S: implications for studies of explosive binary systems 

      Sun, Lijie; Xu, Xinxing; Hou, S.Q.; José Pont, Jordi (Elsevier, 2020-03-10)
      Article
      Open Access
      The mass of 27P is expected to impact the X-ray burst (XRB) model predictions of burst light curves and the composition of the burst ashes, but large uncertainties and inconsistencies still exist in the reported 27P masses. ...

    • Integral SPH: Connecting the partition of unit to accurate gradient estimation 

      García Senz, Domingo; Cabezón Gómez, Rubén Martín (University of Exeter, 2019)
      Conference lecture
      Open Access

    • 123-321 models of classical novae 

      José Pont, Jordi; Shore, Steven N.; Casanova Bustamante, Jordi (EDP Sciences, 2020-01-28)
      Article
      Open Access
      Context. High-resolution spectroscopy has revealed large concentrations of CNO and sometimes other intermediate-mass elements (e.g., Ne, Na, Mg, or Al, for ONe novae) in the shells ejected during nova outbursts, suggesting ...

    • The effects of unresolved double degenerates in the white dwarf luminosity function 

      Rebassa Mansergas, Alberto; Torres Gil, Santiago (Oxford University Press, 2020-02-01)
      Article
      Restricted access - publisher's policy
      We perform an analysis of the single white dwarf and the double degenerate binary populations in the solar neighbourhood following a population synthesis approach to investigate the effects of unresolved double degenerates ...

    • Explosion of fast spinning Sub-Chandrasekhar mass white dwarfs 

      Cabezón Gómez, Rubén Martín; García Senz, Domingo (Springer International Publishing, 2018)
      Conference lecture
      Restricted access - publisher's policy
      We study the explosion of rotating sub-Chandrasekhar mass white dwarfs using three-dimensional hydrodynamic simulations. High rotational speeds are assumed in order to significantly distort the initial spherical geometry ...

    • Gaia DR2 white dwarfs in the Hercules stream 

      Torres Gil, Santiago; Cantero, Carles; Camisassa, María E.; Antoja, T.; Rebassa Mansergas, Alberto; Althaus, Leandro G.; Thelemaque, Thomas; Canovas Cabrera, Héctor (EDP Sciences, 2019-09-01)
      Article
      Open Access
      We analyzed the velocity space of the thin- and thick-disk Gaia white dwarf population within 100 pc by searching for signatures of the Hercules stellar stream. We aimed to identify objects belonging to the Hercules stream, ...

    • Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function 

      Tononi García, Jordi; Torres Gil, Santiago; García-Berro Montilla, Enrique; Camisassa, María E.; Althaus, Leandro G.; Rebassa Mansergas, Alberto (EDP Sciences, 2019-08-06)
      Article
      Open Access
      We analyzed the effect of the sedimentation of 22Ne on the local white dwarf luminosity function by studying scenarios under different Galactic metallicity models. Methods. We use an advanced population synthesis code based ...

    • Infrared-excess white dwarfs in the Gaia 100 pc sample 

      Rebassa Mansergas, Alberto; Solano Márquez, Enrique; Xu, Siyi; Rodrigo Blanco, Carlos; Jiménez Esteban, F. M.; Torres Gil, Santiago (Oxford University Press, 2019-11)
      Article
      Open Access
      We analyse the 100¿pc Gaia white dwarf volume-limited sample by means of VOSA (Virtual Observatory SED Analyser) with the aim of identifying candidates for displaying infrared excesses. Our search focuses on the study of ...

    • Nucleosynthesis in stellar explosions: Type Ia supernovae, classical novae, and type I X-ray bursts 

      José Pont, Jordi (2019-02-20)
      Article
      Open Access
      Nuclear astrophysics aims at understanding the cosmic origin of the chemical elements and the energy generation in stars. It constitutes a truly multidisciplinary arena that combines tools, developments, and achievements ...