Astrophysical: Techniques

  • Publication
    High-resolution imaging and near-infrared spectroscopy of penumbral decay
    Aims: Combining high-resolution spectropolarimetric and imaging data is key to understanding the decay process of sunspots as it allows us to scrutinize the...
  • Publication
    High-resolution infrared spectroscopy as a tool to detect false positives of transit search programs
    Context. Transit search programs such as CoRoT and Kepler now have the capability of detecting planets as small as the Earth. The detection of these planets...
  • 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...