Ara es mostren els items 41-60 de 78

    • Random forest classification of Gaia DR3 white dwarf-main sequence spectra: a feasibility study 

      Echeverry, David; Torres Gil, Santiago; Rebassa Mansergas, Alberto; Ferrer i Burjachs, Aina (EDP Sciences, 2022-11-01)
      Article
      Accés obert
      Aims. The third Gaia data release provides low-resolution spectra for around 200 million sources. It is expected that a sizeable fraction of them contain a white dwarf (WD), neither isolated, or in a binary system with a ...
    • Random Forest identification of the thin disc, thick disc, and halo Gaia-DR2 white dwarf population 

      Torres Gil, Santiago; Cantero, C.; Rebassa Mansergas, Alberto; Skorobogatov, G.; Jiménez Esteban, F. M.; Solano Márquez, Enrique (Oxford University Press, 2019-03-13)
      Article
      Accés obert
      Gaia-DR2 has provided an unprecedented number of white dwarf candidates of ourGalaxy. In particular, it is estimated thatGaia-DR2 has observed nearly 400 000 ofthese objects and close to 18 000 up to 100 pc from the Sun. ...
    • Revisiting the luminosity function of single halo white dwarfs 

      Cojocaru, Elena Ruxandra; Torres Gil, Santiago; Althaus, Leandro G.; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (EDP Sciences, 2015-09-01)
      Article
      Accés obert
      Context. White dwarfs are the fossils left by the evolution of low- and intermediate-mass stars, and have very long evolutionary timescales. This allows us to use them to explore the properties of old populations, like the ...
    • Simulación de Monte Carlo de la población de enanas blancas de la galaxia 

      Torres Gil, Santiago (Universitat Politècnica de Catalunya, 2002-07-10)
      Tesi
      Accés obert
      El estudio de las propiedades de la población de enanas blancas de la Galaxia es muy amplio, e implica aportaciones en diferentes campos de la astrofísica, tales como evolución estelar, dinámica galáctica, ...
    • Structure and evolution of ultra-massive white dwarfs in general relativity 

      Althaus, Leandro G.; Camisassa, María Eugenia; Torres Gil, Santiago; Battich, Tiara; Córsico, Alejandro H.; Rebassa Mansergas, Alberto; Raddi, Roberto (EDP Sciences, 2022-12-01)
      Article
      Accés obert
      Ultra-massive white dwarfs (M? & 1.05M ) are of utmost importance in view of the role they play in type Ia supernovae explosions, merger events, the existence of high magnetic field white dwarfs, and the physical processes ...
    • TECNOLOGIES D'INFORMACIÓ QUÀNTICA (Examen final, 1r quadrimestre) 

      Torres Gil, Santiago (Universitat Politècnica de Catalunya, 2023-01-19)
      Examen
      Accés restringit per decisió de l'autor
    • The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo 

      Camacho Díaz, Judit; Torres Gil, Santiago; Isern Vilaboy, Jordi; Althaus, Leandro Gabriel; García-Berro Montilla, Enrique (2007-06-13)
      Article
      Accés obert
      Context. The interpretation of microlensing results towards the Large Magellanic Cloud (LMC) still remains controversial. White dwarfs have been proposed to explain these results and, hence, to contribute significantly ...
    • The contribution of red dwarfs and white dwarfs to the halo dark matter 

      Torres Gil, Santiago; Camacho Díaz, Judit; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (2008)
      Article
      Accés obert
    • The difficulty of finding double-degenerate progenitors of type Ia supernovae 

      Rebassa Mansergas, Alberto; Toonen, S.; Korol, V.; Torres Gil, Santiago (2018)
      Text en actes de congrés
      Accés obert
      The double-degenerate progenitors of type Ia su- pernovae (SNIa) are double white dwarf binaries with a totalmass near the Chandrasekhar limit and with merger timescales smaller than the Hubble time. The fact that we ...
    • The effects of metallicity on the Galactic disk population of white dwarfs 

      Cojocaru, Elena Ruxandra; Torres Gil, Santiago; Isern Vilaboy, Jordi; García-Berro Montilla, Enrique (2014-06)
      Article
      Accés obert
      Context. It has been known for a long time that stellar metallicity plays a significant role in the determination of the ages of the different Galactic stellar populations, when main sequence evolutionary tracks are employed. ...
    • The effects of the Observational Selection Criteria on the post common envelope white dwarf-main sequence binary population 

      Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique; Zorotovic, Mónica; Schreiber, Mathias R.; Rebassa Mansergas, Alberto (American Institute of Physics (AIP), 2010)
      Comunicació de congrés
      Accés obert
      We present a detailed Monte Carlo simulator of the Galactic population of binary stars. Preliminary results are presented for the white dwarf-main sequence (WD+MS) binary population resulting from a common envelope (CE) ...
    • 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
      Accés restringit per política de l'editorial
      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 ...
    • The evolution of white dwarfs resulting from helium-enhanced, low-metallicity progenitor stars 

      Althaus, Leandro G.; de Geronimo, Francisco; Córsico, Alejandro H.; Torres Gil, Santiago; García-Berro Montilla, Enrique (EDP Sciences, 2017-01-01)
      Article
      Accés obert
      Context. Some globular clusters host multiple stellar populations with different chemical abundance patterns. This is particularly true for ¿ Centauri, which shows clear evidence of a helium-enriched subpopulation characterized ...
    • The formation of ultra-massive carbon-oxygen core white dwarfs and their evolutionary and pulsational properties 

      Althaus, Leandro G.; Gil Pons, Pilar; Córsico, Alejandro H.; Camisassa, María Eugenia; Miller Bertolami, Marcelo M; de Geronimo, Francisco; Torres Gil, Santiago; Gutiérrez Cabello, Jordi; Rebassa Mansergas, Alberto (EDP Sciences, 2021-02)
      Article
      Accés obert
      The existence of ultra-massive white dwarf stars, MWD & 1.05M , has been reported in several studies. These white dwarfs are relevant for the role they play in type Ia Supernova explosions, the occurrence of physical ...
    • The Gaia white dwarf population within 100 pc of the Sun 

      Torres Gil, Santiago; Rebassa Mansergas, Alberto; Jiménez Esteban, F. M.; Cantero, C.; Canals, Pere; Skorobogatov, G.; Solano, E (2018)
      Text en actes de congrés
      Accés obert
      The recent Gaia Data Release 2 has provided an unprecedented sample of the local white dwarf population. The high astrometric resolution and the photometry provided by Gaia allows to build a clean magnitude-color diagram ...
    • The kinematics of the white dwarf population from the SDSS DR12 

      Anguiano, B.; Rebassa Mansergas, Alberto; Torres Gil, Santiago; García-Berro Montilla, Enrique; Freeman, K. C. (2017)
      Text en actes de congrés
      Accés obert
      We use the Sloan Digital Sky Survey Data Release 12, which is the largest avail-able white dwarf catalog to date, to study the evolution of the kinematical properties of thepopulation of white dwarfs in the Galactic disc. ...
    • The kinematics of the white dwarf population from the SDSS DR12 

      Anguiano, B.; Rebassa Mansergas, Alberto; García-Berro Montilla, Enrique; Torres Gil, Santiago; Freeman, K. C.; Zwitter, T. (2017-08-01)
      Article
      Accés obert
      We use the Sloan Digital Sky Survey Data Release 12, which is the largest available white dwarf catalogue to date, to study the evolution of the kinematical properties of the population of white dwarfs in the Galactic disc. ...
    • The kinematics of white dwarfs from the SDSS DR12 

      García-Berro Montilla, Enrique; Skorobogatov, G.; Torres Gil, Santiago; Anguiano, B.; Rebassa Mansergas, Alberto (2018)
      Text en actes de congrés
      Accés obert
      We use the Sloan Digital Sky Survey Data Release 12, which is the largest availablewhite dwarf catalogue to date, to study the evolution of the kinematical properties of the pop-ulation of white dwarfs of the Galactic disk. ...
    • The population of single and binary white dwarfs of the Galactic bulge 

      Torres Gil, Santiago; García-Berro Montilla, Enrique; Cojocaru, Elena Ruxandra; Calamida, Annalisa (Oxford University Press, 2018-05-01)
      Article
      Accés obert
      Recent Hubble Space Telescope observations have unveiled the white dwarf cooling sequence of the Galactic bulge. Although the degenerate sequence can be well fitted employing the most up-to-date theoretical cooling sequences, ...
    • The population of white dwarf-main sequence binaries in the SDSS DR 12 

      Cojocaru, Elena Ruxandra; Rebassa Mansergas, Alberto; Torres Gil, Santiago; García-Berro Montilla, Enrique (2017-09-11)
      Article
      Accés obert
      We present a Monte Carlo population synthesis study of white dwarf-main sequence (WD+MS) binaries in the Galactic disc aimed at reproducing the ensemble properties of the entire population observed by the Sloan Digital Sky ...