Now showing items 1-15 of 15

    • A common origin of magnetism from planets to white dwarfs 

      Isern Vilaboy, Jordi; García-Berro Montilla, Enrique; Kulebi, Baybar; Lorén Aguilar, Pablo (2017-02-20)
      Article
      Open Access
      Isolated magnetic white dwarfs have field strengths ranging from kilogauss to gigagauss. However, the origin of the magnetic field has not been hitherto elucidated. Whether these fields are fossil, hence the remnants of ...
    • A white dwarf merger as progenitor of the anomalous X-Ray pulsar 4U 0142+61? 

      Rueda, Jorge A.; Boshkayev, K.; Izzo, L.; Ruffini, R.; Lorén Aguilar, Pablo; Kuelebi, B.; Aznar Siguan, Gabriela; García-Berro Montilla, Enrique (2013-08)
      Article
      Open Access
      It has been recently proposed that massive, fast-rotating, highly magnetized white dwarfs could describe the observational properties of some of soft gamma-ray repeaters and anomalous X-ray pulsars (AXPs). Moreover, it has ...
    • BAETULO XXI, o de com arribar a Mart des de la secundària 

      Serrano Porta, Lydia; Ramírez Alcántara, Jorge; Portell Canal, Xavier; Pijuan, Caterina; Monfort Peligero, Lluís; Ayza, Assumpta; Berenguer Sau, Jordi; Carnerero López, Sheila; Crespo Artiaga, Daniel; López Codina, Daniel; López Rubio, Juan; Lorén Aguilar, Pablo; Melo Vera, Maria Jesús (2008)
      Conference report
      Open Access
    • 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. ...
    • 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 ...
    • On the origin of high-field magnetic white dwarfs 

      García-Berro Montilla, Enrique; Torres Gil, Santiago; Lorén 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 ...
    • One-armed spiral instability in double-degenerate post-merger accretion disks 

      kashyap, Rahul; Fisher, Robert T.; García-Berro Montilla, Enrique; Aznar-Siguán, Gabriela; Ji, Suoqing; Lorén Aguilar, Pablo (2017-05-01)
      Article
      Open Access
      Increasing observational and theoretical evidence points to binary white dwarf (WD) mergers as the origin of some, if not most, normal Type Ia supernovae (SNe Ia). In this paper, we discuss the post-merger evolution of ...
    • Smoothed particle hydrodynamics simulations of the core-degenerate scenario for Type Ia supernovae 

      Aznar Siguan, Gabriela; García-Berro Montilla, Enrique; Lorén Aguilar, Pablo; Soker, Noam; Kashi, Amit (2015-07-01)
      Article
      Open Access
      The core-degenerate scenario for Type Ia supernovae involves the merger of the hot core of an asymptotic giant branch star and a white dwarf, and might contribute a non-negligible fraction of all thermonuclear supernovae. ...
    • Spiral instability can drive thermonuclear explosions in binary white dwarf mergers 

      kashyap, Rahul; Fisher, Robert T.; García-Berro Montilla, Enrique; Aznar Siguan, Gabriela; Ji, Suoqing; Lorén Aguilar, Pablo (2015-02-10)
      Article
      Open Access
      Thermonuclear, or Type Ia supernovae (SNe Ia), originate from the explosion of carbon-oxygen white dwarfs, and serve as standardizable cosmological candles. However, despite their importance, the nature of the progenitor ...
    • The gravitational wave emission from white dwarf interactions in globular clusters 

      Lorén Aguilar, Pablo; Lobo Gutiérrez, José Alberto; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (2009-03-01)
      Article
      Restricted access - publisher's policy
      In the dense central regions of globular clusters close encounters of two white dwarfs are relatively frequent. The estimated frequency is one or more strong encounters per star in the lifetime of the cluster. Such ...
    • The post-merger magnetized evolution of white dwarf binaries: The double-degenerate channel of sub-Chandrasekhar type Ia supernovae and the formation of magnetized white dwarfs 

      Ji, Suoqing; Fisher, Robert T.; García-Berro Montilla, Enrique; Tzeferacos, Petros; Jordan, George C.; Lee, Dongwook; Lorén Aguilar, Pablo; Cremer, Pascal; Behrends, Jan (2013-08-20)
      Article
      Open Access
      Type Ia supernovae (SNe Ia) play a crucial role as standardizable cosmological candles, though the nature of their progenitors is a subject of active investigation. Recent observational and theoretical work has pointed to ...
    • White dwarf dynamical interactions and fast optical transients 

      García-Berro Montilla, Enrique; Badenes Montoliu, Carles; Aznar Siguan, Gabriela; Lorén Aguilar, Pablo (2017-07-01)
      Article
      Open Access
      Recent advances in time-domain astronomy have uncovered a new class of optical transients with time-scales shorter than typical supernovae and a wide range of peak luminosities. Several subtypes have been identified within ...
    • White dwarf mergers and the origin of R coronae borealis stars 

      Lorén Aguilar, Pablo; Longland, Richard Leigh; José Pont, Jordi; García-Berro Montilla, Enrique; Althaus, Leandro Gabriel; Isern-Fontanet, J. (2012)
      Conference report
      Restricted access - publisher's policy
      We present a nucleosynthesis study of the merger of a 0.4 M⊙ helium white dwarf with a 0.8 M⊙ carbon-oxygen white dwarf, coupling the thermodynamic history of Smoothed Particle Hydrodynamics particles with a post-processing ...