Astrophysical: Techniques

  • Publication
    Hint of an exocomet transit in the CHEOPS light curve of HD 172555
    HD 172555 is a young (~20 Myr) A7V star surrounded by a 10 au wide debris disk suspected to be replenished partly by collisions between large planetesimals...
  • Publication
    Hints of a close outer companion to the ultra-hot Jupiter TOI-2109 b
    Context. Hot Jupiters (HJs) with close-by planetary companions are rare, with only a handful of them having been discovered so far. This could be due to their...
  • Publication
    HiPERCAM: a quintuple-beam, high-speed optical imager on the 10.4-m Gran Telescopio Canarias
    HiPERCAM is a portable, quintuple-beam optical imager that saw first light on the 10.4-m Gran Telescopio Canarias (GTC) in 2018. The instrument uses re-imaging...
  • Publication
    Holographic imaging of crowded fields: high angular resolution imaging with excellent quality at very low cost
    We present a method for speckle holography that is optimized for crowded fields. Its two key features are an iterative improvement of the instantaneous point...
  • Publication
    Homogeneous photometry - VII. Globular clusters in the Gaia era
    We present wide-field, ground-based Johnson-Cousins UBVRI photometry for 48 Galactic globular clusters based on about 90 000 public and proprietary images. The...
  • Publication
    Horizontal flow fields in and around a small active region. The transition period between flux emergence and decay
    Context. The solar magnetic field is responsible for all aspects of solar activity. Thus, emergence of magnetic flux at the surface is the first manifestation...
  • Publication
    HORuS transmission spectroscopy and revised planetary parameters of KELT-7 b
    We report on the high-resolution spectroscopic observations of two planetary transits of the hot Jupiter KELT-7b (M p = 1.28 ± 0.17M Jup, T eq = 2028 K)...
  • Publication
    Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS). III. Atmospheric structure of the misaligned ultra-hot Jupiter WASP-121b
    Ultra-hot Jupiters offer interesting prospects for expanding our theories on dynamical evolution and the properties of extremely irradiated atmospheres. In this...
  • Publication
    Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS). IV. A spectral inventory of atoms and molecules in the high-resolution transmission spectrum of WASP-121 b
    Context. WASP-121 b is a hot Jupiter that was recently found to possess rich emission (day side) and transmission (limb) spectra, suggestive of the presence of...