Ara es mostren els items 22-41 de 78

    • Gaia 0007-1605: an old triple system with an inner brown dwarf-white dwarf binary and an outer white dwarf companion 

      Rebassa Mansergas, Alberto; Torres Gil, Santiago; Raddi, Roberto (Institute of Physics (IOP), 2022-03-15)
      Article
      Accés obert
      We identify Gaia 0007–1605 A,C as the first inner brown dwarf–white dwarf binary of a hierarchical triple system in which the outer component is another white dwarf (Gaia 0007–1605 B). From optical/near-infrared spectroscopy ...
    • 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
      Accés obert
      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, ...
    • General relativistic pulsations of ultra-massive ZZ Ceti stars 

      Córsico, Alejandro H.; Boston, Reece; Althaus, Leandro G.; Kilic, Mukremin; Kepler, Souza Oliveira; Camisassa, María Eugenia; Torres Gil, Santiago (Oxford University Press, 2023-10-01)
      Article
      Accés obert
      Ultra-massive white dwarf stars are currently being discovered at a considerable rate, thanks to surveys such as the Gaia space mission. These dense and compact stellar remnants likely play a major role in Type Ia supernova ...
    • High-proper-motion white dwarfs and halo dark matter 

      Torres Gil, Santiago; García-Berro Montilla, Enrique; Burkert, Andreas; Isern Vilaboy, Jordi (Blackwell, 2002-11)
      Article
      Accés obert
      The interpretation of the old, cool white dwarfs recently found by Oppenheimer et al. is still controversial. Whereas these authors claim that they have finally found the elusive ancienthalo white dwarf population that ...
    • 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
      Accés obert
      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 ...
    • Kinematic properties of white dwarfs. Galactic orbital parameters and age-velocity dispersion relation 

      Raddi, Roberto; Torres Gil, Santiago; Rebassa Mansergas, Alberto; Camisassa, María Eugenia; Koester, Detlev; Gentile Fusillo, N. P.; Tremblay, P. E.; Dimpel, Markus; Heber, Ulrich; Maldonado, Jesús (EDP Sciences, 2022-01-27)
      Article
      Accés restringit per política de l'editorial
      Context. Kinematic and chemical tagging of stellar populations have both revealed much information on the past and recent history of the Milky Way, including its formation history, merger events, and mixing of populations ...
    • Main-sequence companions to white dwarfs - II. The age-activity-rotation relation from a sample of Gaia common proper motion pairs 

      Rebassa Mansergas, Alberto; Maldonado, Jesús; Raddi, Roberto; Torres Gil, Santiago; Hoskin, Matthew; Cunningham, Tim; Hollands, Mark; Ren, Juanjuan; Gänsicke, Boris T.; Tremblay, P. E.; Camisassa, María Eugenia (Oxford University Press, 2023-10-06)
      Article
      Accés obert
      Magnetic activity and rotation are related to the age of low-mass main-sequence stars. To further constrain these relations, we study a sample of 574 main-sequence stars members of common proper motion pairs with white ...
    • 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
      Accés obert
      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, ...
    • Monte Carlo simulations of post-common-envelope white dwarf plus main sequence binaries: comparison with the SDSS DR7 observed sample 

      Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique; Zorotovic, Monica; Schreiber, Mathias R.; Rebassa Mansergas, Alberto; Nebot Gómez-Moran, Ada; Gänsicke, Boris T. (2014-06-01)
      Article
      Accés obert
      Context. Detached white dwarf + main sequence (WD+MS) systems represent the simplest population of post-common envelope binaries (PCEBs). Since the ensemble properties of this population carries important information about ...
    • Monte Carlo simulations of the binary white dwarf population: a progress report 

      Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique (IOP PUBLISHING LTD, 2009)
      Comunicació de congrés
      Accés obert
    • Monte Carlo simulations of the binary white dwarf population: a progress report 

      Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique (2009)
      Article
      Accés obert
      We present a detailed Monte Carlo simulator of the population of binary stars within the solar neighborhood. We have used the most updated models for stellar evolution, a complete treatment of the Roche lobe overflow ...
    • Monte Carlo simulations of the formation channels of SNeIb. PoS(SUPERNOVA)008 

      Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique (PoS - Proceedings of Science, 2007)
      Capítol de llibre
      Accés obert
      We present a Monte Carlo simulator of the population of binary stars within the solar neighborhood. We have used the most updated models for stellar evolution, a complete treatment of the Roche lobe over ow episodes, as ...
    • Monte Carlo simulations of the post-common envelope white dwarf-main sequence binary population 

      Camacho Díaz, Judit; Torres Gil, Santiago; García-Berro Montilla, Enrique; Zorotovic, Monica; Schreiber, Mathias R. (2010)
      Comunicació de congrés
      Accés obert
    • 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
      Accés obert
      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 ...
    • 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)
      Comunicació de congrés
      Accés obert
      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 ...
    • Oxygen-neon-rich merger during common envelope evolution 

      Canals, Pere; Torres Gil, Santiago; Soker, Noam (Oxford University Press, 2018-11-01)
      Article
      Accés obert
      We conduct a population synthesis study of the common envelope evolution (CEE) of a white dwarf (WD) and an asymptotic giant branch (AGB) star and find that the potential number of type Ia supernovae (SNe Ia) from the core ...
    • 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)
      Capítol de llibre
      Accés obert
      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 ...
    • 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, Monica; Schreiber, Mathias R.; García-Berro Montilla, Enrique (Astronomical Society of the Pacific Conference Series (ASP), 2011)
      Text en actes de congrés
      Accés obert
    • Quantum computing : problems and exercises 

      Torres Gil, Santiago; Bruna Escuer, Pere; Massignan, Pietro Alberto (Iniciativa Digital Politècnica. Oficina de Publicacions Acadèmiques Digitals de la UPC, 2020-07)
      Llibre
      Accés restringit a la comunitat UPC
      Quantum technology is one of the most promising and challenging fields in contemporary science. Quantum computing, quantum cryptography, and more generally quantum information technologies claim that they, in the short ...
    • 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 ...