Now showing items 1-20 of 38

  • 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
    Open Access
    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 ...
  • 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)
    Conference lecture
    Restricted access - publisher's policy
  • 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
    Open Access
    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 white dwarf-main sequence binaries in the galactic disk 

    Rebassa Mansergas, Alberto; García-Berro Montilla, Enrique; Torres Gil, Santiago (2017)
    Conference report
    Open Access
    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
    Open Access
    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 ...
  • 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
    Open Access
    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
    Open Access
    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
    Open Access
    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
    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 ...
  • 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 ...
  • 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, ...
  • 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 ...
  • J-PLUS: The javalambre photometric local universe survey 

    Cenarro Lagunas, Andrés Javier; Moles Villamate, Mariano; Cristóbal Hornillos, David; Rebassa Mansergas, Alberto (EDP Sciences, 2019-02-01)
    Article
    Open Access
    The Javalambre-Photometric Local Universe Survey (J-PLUS ) is an ongoing 12-band photometric optical survey, observing thousands of square degrees of the Northern hemisphere from the dedicated JAST/T80 telescope at the ...
  • Monte Carlo simulations of post-common-envelope white dwarf + main sequence binaries: The effects of including recombination energy 

    Zorotovic, Monica; García-Berro Montilla, Enrique; Schreiber, Mathias R.; Camacho Díaz, Judit; Torres Gil, Santiago; Rebassa Mansergas, Alberto; Gänsicke, Boris T. (2014-08-20)
    Article
    Open Access
    Context. Detached white dwarf + main sequence (WD+MS) post-common-envelope binaries (PCEBs) are perhaps the most suitable objects for testing predictions of close-compact binary-star evolution theories, in particular, ...
  • Observational constraints on the age-metallicity relation from white dwarf-Main sequence binaries 

    Rebassa Mansergas, Alberto; García-Berro Montilla, Enrique; Torres Gil, Santiago; Anguiano, B.; Manser, C. J.; Gänsicke, Boris T.; Liu, X. (Astronomical Society of the Pacific Conference Series (ASP), 2017)
    Article
    Open Access
    The age-metallicity relation (AMR) is a fundamental observational property to understand how the Galactic disc formed and evolved chemically in time. However, there is not yet a consensus on the observed properties of the ...
  • Orbital periods and component masses of three double white dwarfs 

    Rebassa Mansergas, Alberto; Parsons, S. G.; García-Berro Montilla, Enrique; Gaensicke, B. T.; Schreiber, Mathias R.; Rybicka, M.; Koester, D. (2017-04-01)
    Article
    Open Access
    The merger of close double white dwarfs (CDWDs) is one of the favourite evolutionary channels for producing Type Ia supernovae (SN Ia). Unfortunately, current theories of the evolution and formation of CDWDs are still ...
  • Population Synthesis of Post-Common Envelope White-Dwarf-Main-Sequence Binaries in the Sloan Digital Sky Survey 

    Torres Gil, Santiago; Camacho Díaz, Judit; Rebassa Mansergas, Alberto; Zorotovic, Mónica; Schreiber, Mathias R.; García-Berro Montilla, Enrique (Astronomical Society of the Pacific, 2011-09-01)
    Part of book or chapter of book
    Open Access
    We present preliminary results of detailed Monte Carlo simulations of the population of white dwarf-main sequence binary systems in the Sloan Digital Sky Survey Data Release 7 (SDSS DR7). We have used the most up-to-date ...
  • 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
    Open Access
    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. ...
  • Testing the models of CV evolution 

    Pala, A. F.; Ederoclite, A; Gentile Fusillo, N. P.; Vázquez Ramió, H; Raddi, R; Abril, J; Gänsicke, Boris T.; Rebassa Mansergas, Alberto (2017)
    Conference report
    Open Access
    The study of Cataclysmic Variables (CVs) is crucial to test our understanding of binary evolution and its application to many astrophysical phenomena, such as short gamma-ray bursts, X-ray transients and, more important, ...
  • Testing the white dwarf mass-radius relationship with eclipsing binaries 

    Parsons, S. G.; Gänsicke, Boris T.; Marsh, T. R.; Ashley, R. P.; Bours, M. C. P.; Breedt, E.; Burleigh, M. R.; Copperwheat, C. M.; Dhillon, V. S.; Green, M.; Hardy, L. K.; Hermes, J. J.; Irawati, P.; Kerry, P.; Littlefair, S. P.; McAllister, M. J.; Rattanasoon, S.; Rebassa Mansergas, Alberto; Sahman, D. I.; Schreiber, Mathias R. (2017-10-01)
    Article
    Open Access
    We present high-precision, model-independent, mass and radius measurements for 16 white dwarfs in detached eclipsing binaries and combine these with previously published data to test the theoretical white dwarf mass–radius ...