Astrophysical: Techniques

  • Publication
    High-resolution Observations of Hα Spectra with a Subtractive Double Pass
    High-resolution imaging spectroscopy in solar physics has relied on Fabry-Pérot interferometers (FPIs) in recent years. FPI systems, however, become technically...
  • Publication
    High-resolution Observations of Siphon Flows in a Solar Magnetic Pore
    We investigate signatures of siphon flows in a region around a solar magnetic pore, observed in the photosphere at μ = 0.6, during its decay phase. We analyze...
  • Publication
    High-resolution optical imaging of the core of the globular cluster M15 with FastCam
    We present high-resolution I-band imaging of the core of the globular cluster M15 obtained at the 2.5-m Nordic Optical Telescope with FastCam, a low readout...
  • Publication
    High-resolution transmission spectroscopy study of ultra-hot Jupiters HAT-P-57b, KELT-17b, KELT-21b, KELT-7b, MASCARA-1b, and WASP-189b
    Ultra-hot jupiters (UHJs) are giant planets on short orbital periods with high equilibrium temperature (T eq) values. Their hot, extended atmospheres are...
  • Publication
    High-sensitivity measurements of the cosmic microwave background power spectrum with the extended Very Small Array
    We present deep Ka-band (ν~ 33 GHz) observations of the cosmic microwave background (CMB) made with the extended Very Small Array (VSA). This configuration...
  • Publication
    High-z Sudoku: a diagnostic tool for identifying robust (sub)mm redshifts
    We present methods to (i) graphically identify robust redshifts using emission lines in the (sub)mm regime, (ii) evaluate the capabilities of different (sub)mm...
  • 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...