Journal: Astronomy and Astrophysics

  • Publication
    Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors
    Aims: We try to identify ultra-cool dwarfs from the seventh Data Release of the Sloan Digital Sky Survey (SDSS DR7) with SDSS i-z and r-z colors. We also obtain...
  • Publication
    Ultra-deep imaging of NGC 1052-DF2 and NGC 1052-DF4 to unravel their origins
    A number of scenarios have been proposed to explain the low velocity dispersion (and hence possible absence of dark matter) of the low surface brightness...
  • Publication
    UltraCompCAT: A comprehensive catalogue of ultra-compact and short orbital period X-ray binaries
    Ultracompact X-ray binaries (UCXBs) are a distinctive but elusive family of low-mass X-ray binaries (LMXBs) characterised by their tight orbits and degenerate...
  • Publication
    Uncertainties in the solar photospheric oxygen abundance
    Aims: The purpose of this work is to better understand the confidence limits of the photospheric solar oxygen abundance derived from three-dimensional models...
  • Publication
    Uncertainty-aware blob detection with an application to integrated-light stellar population recoveries
    Context. Blob detection is a common problem in astronomy. One example is in stellar population modelling, where the distribution of stellar ages and...
  • Publication
    Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076
    Context. TOI-2076 is a transiting three-planet system of sub-Neptunes orbiting a bright (G = 8.9 mag), young (340 ± 80 Myr) K-type star. Although a validated...
  • Publication
    Understanding internetwork magnetic fields as determined from visible and infrared spectral lines
    We present numerical experiments aimed at understanding why near-infrared observations systematically deliver weak magnetic fields in the internetwork, whereas...
  • Publication
    Understanding the evolution and dust formation of carbon stars in the Large Magellanic Cloud via the JWST
    Context. Carbon stars have been, and still are, extensively studied. Given their complex internal structure and their peculiar chemical composition, they are...
  • Publication
    Understanding the thermal and magnetic properties of an X-class flare in the low solar atmosphere
    We analyse the spatial distribution and vertical stratification of the physical parameters of the solar atmosphere when an X-class flare occurs. We made use of...