Astrophysical: Techniques

  • Publication
    He I λ 10 830 Å in the transmission spectrum of HD209458 b
    Context. Recently, the He I triplet at 10 830 Å was rediscovered as an excellent probe of the extended and possibly evaporating atmospheres of close-in...
  • Publication
    Height variation of the cutoff frequency in a sunspot umbra
    Context. In the solar atmosphere, the acoustic cutoff frequency is a local quantity that depends on atmospheric height. It separates low-frequency evanescent...
  • Publication
    HerMES: ALMA Imaging of Herschel-selected Dusty Star-forming Galaxies
    The Herschel Multi-tiered Extragalactic Survey (HerMES) has identified large numbers of dusty star-forming galaxies (DSFGs) over a wide range in redshift. A...
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    High ionisation absorption in low mass X-ray binaries
    The advent of the new generation of X-ray telescopes yielded a significant step forward in our understanding of ionised absorption generated in the accretion...
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    High spatial resolution optical imaging of the multiple T Tauri system Lk Hα 262/Lk Hα 263
    We report high spatial resolution i' band imaging of the multiple T Tauri system LkHα 262/LkHα 263 obtained during the first commissioning period of the...
  • Publication
    High-contrast optical imaging of companions: the case of the brown dwarf binary HD 130948 BC
    Context. High-contrast imaging at optical wavelengths is limited by the modest correction of conventional near-IR optimized AO systems. We take advantage of new...
  • 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 observational analysis of flare ribbon fine structures
    Context. Since the mechanism of energy release from solar flares is still not fully understood, the study of fine-scale features developing during flares...