Astrophysical: Techniques

  • Publication
    Differential atmospheric refraction in integral-field spectroscopy: Effects and correction. Atmospheric refraction in IFS
    The basic concepts for determining the effect of differential atmospheric refraction on integral-field (two-dimensional) spectroscopic observations are...
  • Publication
    Differential image motion in astrometric observations with very large seeing-limited telescopes
    Aims. We investigate how to quantitatively model the observed differential image motion (DIM) in relative astrometric observations. Methods. As a test bed we...
  • Publication
    Differential reddening in 48 globular clusters: An end to the quest for the intracluster medium
    For decades, it has been theorized that a tenuous but detectable intracluster medium should be present in globular clusters, which is continuously replenished...
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    Discovery and characterization of the exoplanets WASP-148b and c. A transiting system with two interacting giant planets
    We present the discovery and characterization of WASP-148, a new extrasolar system that includes at least two giant planets. The host star is a slowly rotating...
  • Publication
    Discovery and mass measurement of the hot, transiting, Earth-sized planet, GJ 3929 b
    We report the discovery of GJ 3929 b, a hot Earth-sized planet orbiting the nearby M3.5 V dwarf star, GJ 3929 (G 180-18, TOI-2013). Joint modelling of...
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    Discovery and physical characterization as the first response to a potential asteroid collision: The case of 2023 DZ<SUB>2</SUB>
    Context. Near-Earth asteroids (NEAs) that may evolve into impactors deserve detailed threat assessment studies. Early physical characterization of a would-be...
  • Publication
    Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)
    We present the confirmation and characterisation of GJ 3473 b (G 50-16, TOI-488.01), a hot Earth-sized planet orbiting an M4 dwarf star, whose transiting signal...
  • Publication
    Discovery of a nitrogen-enhanced mildly metal-poor binary system: Possible evidence for pollution from an extinct AGB star
    We report the serendipitous discovery of a nitrogen-rich, mildly metal-poor ([Fe/H] = -1.08) giant star in a single-lined spectroscopic binary system found in...
  • Publication
    Discovery of a planet around the K giant star 4 Ursae Majoris
    For the past 3 years we have been monitoring a sample of 62 K giant stars using precise stellar radial velocity measurements with high accuracy taken at the...