Astrophysical: Techniques

  • Publication
    On the use of photometric redshifts for X-ray selected AGNs
    In this paper we present photometric redshift estimates for a sample of X-ray selected sources detected in the wide-field ( 2 deg^2), bright [ f_X(0.5{-}8 keV)...
  • Publication
    On the use of the Fourier transform to determine the projected rotational velocity of line-profile variable B stars
    Context. The Fourier transform method is a popular tool for deriving the rotational velocities of stars from their spectral line profiles. However, its domain...
  • Publication
    Once in a blue moon: detection of `bluing' during debris transits in the white dwarf WD 1145+017
    The first transiting planetesimal orbiting a white dwarf was recently detected in K2 data of WD 1145+017 and has been followed up intensively. The multiple...
  • Publication
    Optical and Near-Infrared Calibration of AGN Field Stars: An All-Sky Network of Faint Stars Calibrated on the Landolt System
    We present a total of 12,436 photometric measures of 371 field stars of 26 quasars in the visible (UBVRI) and 22,276 photometric measures of 122 field stars of...
  • Publication
    Optical and near-infrared spectroscopy of the black hole transient 4U 1543-47 during its 2021 ultra-luminous state
    We present simultaneous optical and near-infrared spectra obtained during the 2021 outburst of the black hole transient 4U 1543-47. The X-ray hardness-intensity...
  • Publication
    Optical phase curve of the ultra-hot Jupiter WASP-121b
    We present the analysis of TESS optical photometry of WASP-121b, which reveals the phase curve of this transiting ultra-hot Jupiter. Its hotspot is located at...
  • Publication
    Optical polarization and spectral properties of the hydrogen-poor superluminous supernovae SN 2021bnw and SN 2021fpl
    New optical photometric, spectroscopic, and imaging polarimetry data are combined with publicly available data to study some of the physical properties of the...
  • Publication
    Optical properties of metal-poor T dwarf candidates
    Context. Metal-poor brown dwarfs are poorly understood because they are extremely faint and rare. Only a few candidates have been identified as T-type subdwarfs...
  • Publication
    Optical properties of Y dwarfs observed with the Gran Telescopio Canarias
    Aims: Our science goals are to characterise the optical properties of Y dwarfs and to study their consistency with theoretical models. Methods: A sample of five...