Now showing items 1-13 of 13

    • 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
      Open Access
      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 ...
    • 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
      Open Access
      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
      Open Access
      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 ...
    • Forever young white dwarfs: When stellar ageing stops 

      Camisassa, María Eugenia; Althaus, Leandro G.; Torres Gil, Santiago; Córsico, Alejandro H.; Rebassa Mansergas, Alberto; Tremblay, P. E.; Cheng, Sihao; Raddi, Roberto (EDP Sciences, 2021-05-01)
      Article
      Open Access
      White dwarf stars are the most common end point of stellar evolution. The ultramassive white dwarfs are of special interest as they are related to type Ia supernovae explosions, merger events, and fast radio bursts. ...
    • 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
      Open Access
      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 ...
    • 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
      Restricted access - publisher's policy
      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
      Open Access
      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 ...
    • Spectral classification of the 100 pc white dwarf population from Gaia-DR3 and the virtual observatory 

      Jiménez Esteban, F. M.; Torres Gil, Santiago; Rebassa Mansergas, Alberto; Cruz Gamba, Patricia; Murillo Ojeda, Raquel; Solano Márquez, Enrique; Rodrigo Blanco, Carlos; Camisassa, María Eugenia (Oxford University Press, 2023-02-01)
      Article
      Open Access
      The third data release of Gaia has provided low resolution spectra for 100 000 white dwarfs (WDs) that, together with the excellent photometry and astrometry, represent an unrivalled benchmark for the study of this ...
    • 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
      Open Access
      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 ...
    • The evolution of ultra-massive carbon-oxygen white dwarfs 

      Camisassa, María Eugenia; Althaus, Leandro G.; Koester, Detlev; Torres, Santiago; Gil Pons, Pilar; Córsico, Alejandro H. (Oxford University Press, 2022-04-01)
      Article
      Open Access
      Ultra-massive white dwarfs (MWD¿1.05M¿) are considered powerful tools to study type Ia supernovae explosions, merger events, the occurrence of physical processes in the Super Asymptotic Giant Branch (SAGB) phase, and the ...
    • 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
      Open Access
      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 unusual planetary nebula nucleus in the Galactic open cluster M37 and six further hot white dwarf candidates 

      Werner, Klaus; Reindl, Nicole; Raddi, Roberto; Griggio, Massimo; Bedin, Luigi; Camisassa, María Eugenia; Rebassa Mansergas, Alberto; Torres Gil, Santiago; Goodhew, Peter (EDP Sciences, 2023-10-01)
      Article
      Open Access
      Planetary nebulae in Galactic open star clusters are rare objects; only three are known to date. They are of particular interest because their distance can be determined with high accuracy, allowing one to characterize the ...
    • White dwarf spectral type-temperature distribution from Gaia DR3 and the Virtual Observatory 

      Torres Gil, Santiago; Cruz Gamba, Patricia; Murillo Ojeda, Raquel; Jiménez Esteban, F. M.; Rebassa Mansergas, Alberto; Solano Márquez, Enrique; Camisassa, María Eugenia; Raddi, Roberto; Doliguez Le Lourec, J. (EDP Sciences, 2023-09-21)
      Article
      Open Access
      Context. The characterization of white dwarf atmospheres is crucial for accurately deriving stellar parameters such as effective temperature, mass, and age. However, the inclusion of physical processes such as convective ...