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Ara es mostren els items 1-20 de 74

    • A hidden population of white dwarfs with atmospheric carbon traces in the Gaia bifurcation 

      Camisassa, María Eugenia; Torres Gil, Santiago; Hollands, Mark; Koester, Detlev; Raddi, Roberto; Althaus, Leandro G.; Rebassa Mansergas, Alberto (EDP Sciences, 2023-06-01)
      Article
      Accés obert
      Context. The high-quality photometric and astrometric capabilities of the ESA Gaia space mission have revealed a bifurcation of the white dwarf sequence on the color magnitude diagram with two branches: A and B. While the ...

    • A population synthesis fitting of the Gaia resolved white dwarf binary population within 100 pc 

      Torres Gil, Santiago; Canals Canals, Pere; Jiménez Esteban, F. M.; Rebassa Mansergas, Alberto; Solano Márquez, Enrique (Oxford University Press, 2022-04-01)
      Article
      Accés obert
      The Gaia mission has provided an unprecedented wealth of information about the white dwarf population of our Galaxy. In particular, our studies show that the sample up to 100\,pc from the Sun can be considered as practically ...

    • A population synthesis study of the MS+WD population in the SDSS 

      García-Berro Montilla, Enrique; Torres Gil, Santiago; Camacho Díaz, Judit; Rebassa Mansergas, Alberto; Gänsicke, Boris T.; Schreiber, Mathias R.; Zorotovic, Mónica (Astronomical Society of the Pacific Conference Series (ASP), 2015-06-01)
      Article
      Accés obert
      Detached white dwarf + main sequence (WD+MS) systems represent the simplest population of post-common envelope binaries (PCEBs), and their ensemble properties carry important information about common-envelope phase. However, ...

    • A population synthesis study of the MS+WD population in the SDSS 

      García-Berro Montilla, Enrique; Torres Gil, Santiago; Camacho Díaz, Judit; Rebassa Mansergas, Alberto; Gänsicke, Boris T.; Schreiber, Mathias R.; Zorotovic, Mónica (2014)
      Comunicació de congrés
      Accés restringit per política de l'editorial

    • A population synthesis study of white dwarf-main sequence binaries in the galactic disk 

      Rebassa Mansergas, Alberto; García-Berro Montilla, Enrique; Torres Gil, Santiago (2017)
      Text en actes de congrés
      Accés obert
      The companion mass ratio distribution (CMRD) of main sequence binaries is a crucial physical quantity for understanding the evolution of stars in binary systems and for constraining models of binary star formation. However, ...

    • A white dwarf catalogue from Gaia-DR2 and the Virtual Observatory 

      Jiménez Esteban, F. M.; Torres Gil, Santiago; Rebassa Mansergas, Alberto; Skorobogatov, G.; Cantero, C. (Oxford University Press, 2018-01-01)
      Article
      Accés obert
      We present a catalogue of 73¿221 white dwarf candidates extracted from the astrometric and photometric data of the recently published Gaia-DR2 catalogue. White dwarfs were selected from the Gaia Hertzsprung–Russell diagram ...

    • Accurate mass and radius determinations of a cool subdwarf in an eclipsing binary 

      Rebassa Mansergas, Alberto; Parsons, Steven G.; Dhillon, Vikram S.; Ren, Juanjuan; Littlefair, Stuart P.; Marsh, Thomas R.; Torres Gil, Santiago (Springer Nature, 2019-04-08)
      Article
      Accés obert
      Cool subdwarfs are metal-poor low-mass stars that formed during the early stages of the evolution of our Galaxy. Because they are relatively rare in the vicinity of the Sun, we know of few cool subdwarfs in the solar ...

    • An extremely hot white dwarf with a rapidly rotating K-type subgiant companion: UCAC2 46706450 

      Werner, Klaus; Reindl, Nicole; Löbling, Lisa; Pelisoli, Ingrid; Schaffenroth, Veronika; Rebassa Mansergas, Alberto; Irawati, Puji; Ren, Juanjuan (EDP Sciences, 2020-10-01)
      Article
      Accés obert
      Realitzat a/amb:   Eberhard Karls Universität Tübingen / Universität Potsdam / Institut d'Estudis Espacials de Catalunya / National Astronomical Research Institute of Thailand / Zhongguo ke xue yuan
      The subgiant UCAC2 46706450 is a late-type star with an ultraviolet (UV) excess. It was considered as a candidate to establish a sample of stars of spectral type F, G, and K with white dwarf (WD) companions that could be ...

    • An irradiated-Jupiter analogue hotter than the Sun 

      Hallakoun, Na'ama; Maoz, Dan; Istrate, Alina G.; Badenes, Carles; Breedt, Elmé; Gänsicke, Boris T.; Jha, Saurabh; Leibundgut, Bruno; Mannucci, Filippo; Marsh, Thomas R.; Nelemans, Gijs; Patat, Ferdinando; Rebassa Mansergas, Alberto (Springer Nature, 2023-09-14)
      Article
      Accés obert
      Planets orbiting close to hot stars experience intense extreme-ultraviolet radiation, potentially leading to atmosphere evaporation and to thermal dissociation of molecules. However, this extreme regime remains mainly ...

    • Can we reveal the core-chemical composition of ultra-massive white dwarfs through their magnetic fields? 

      Camisassa, María Eugenia; Raddi, Roberto; Althaus, Leandro G.; Isern Vilaboy, Jordi; Rebassa Mansergas, Alberto; Torres, Santiago; Córsico, Alejandro H.; Korre, Lydia (Oxford University Press, 2022-10-01)
      Article
      Accés obert
      Ultra-massive white dwarfs (1.05M¿ . MWD) are particularly interesting objects that allow us to study extreme astrophysical phenomena such as type Ia supernovae explosions and merger events. Traditionally, ultra-massive ...

    • Carbon-oxygen ultra-massive white dwarfs in general relativity 

      Althaus, Leandro G.; Corsico, Alejandro H.; Camisassa, María Eugenia; Torres Gil, Santiago; Gil Pons, Pilar; Rebassa Mansergas, Alberto; Raddi, Roberto (Oxford University Press, 2023-08-01)
      Article
      Accés obert
      We employ the La Plata stellar evolution code, lpcode, to compute the first set of constant rest-mass carbon–oxygen ultra-massive white dwarf evolutionary sequences for masses higher than 1.29 M¿ that fully take into account ...

    • DA white dwarfs from the LSS-GAC survey DR1: the preliminary luminosity and mass functions and formation rate 

      Rebassa Mansergas, Alberto; Cojocaru, Elena Ruxandra; Torres, S.; García-Berro Montilla, Enrique; Liu, X.; Yuan, H-B.; Xiang, M.-X.; Huang, Y.; Koester, D.; Hou, Y.; Li, G.; Zhang, Y. (2015-06-11)
      Article
      Accés obert
      Modern large-scale surveys have allowed the identification of large numbers of white dwarfs. However, these surveys are subject to complicated target selection algorithms, which make it almost impossible to quantify to ...

    • Detached cataclysmic variables are crossing the orbital period gap 

      Zorotovic, Mónica; Schreiber, Mathias R.; Parsons, S. G.; Gaensicke, B. T.; Hardy, A.; Agurto Gangas, C.; Nebot Gómez-Moran, Ada; Rebassa Mansergas, Alberto; Schowpe, A. D. (2016-04-21)
      Article
      Accés obert
      A central hypothesis in the theory of cataclysmic variable (CV) evolution is the need to explain the observed lack of accreting systems in the similar or equal to 2-3 h orbital period range, known as the period gap. The ...

    • Discovery of the first resolved triple white dwarf 

      Perpinyà Vallès, M.; Rebassa Mansergas, Alberto; Gänsicke, Boris T.; Toonen, S.; Hermes, J. J.; Gentile Fusillo, N. P.; Tremblay, P. E. (Oxford University Press, 2019-02-01)
      Article
      Accés obert
      We report the discovery of J1953-1019, the first resolved triple white dwarf system. The triplet consists of an inner white dwarf binary and a wider companion. Using Gaia DR2 photometry and astrometry combined with our ...

    • 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
      Accés obert
      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 ...

    • Examen Final 

      Torres Gil, Santiago; Rebassa Mansergas, Alberto (Universitat Politècnica de Catalunya, 2019-01-21)
      Examen
      Accés restringit a la comunitat UPC

    • Examen Final 

      Torres Gil, Santiago; Rebassa Mansergas, Alberto (Universitat Politècnica de Catalunya, 2020-01-14)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Examen final, 1r quadrimestre) 

      Rebassa Mansergas, Alberto (Universitat Politècnica de Catalunya, 2024-01-15)
      Examen
      Accés restringit a la comunitat UPC

    • FÍSICA (Examen parcial, 1r quadrimestre) 

      Rebassa Mansergas, Alberto (Universitat Politècnica de Catalunya, 2023-10-26)
      Examen
      Accés restringit a la comunitat UPC

    • FONAMENTS DE FÍSICA (Examen final, 1r quadrimestre) 

      Álvarez Lacalle, Enrique; Rebassa Mansergas, Alberto; Martorell Pena, Jordi (Universitat Politècnica de Catalunya, 2023-01-31)
      Examen
      Accés restringit a la comunitat UPC