Astrophysical: Circumstellar matter

  • Publication
    Circumstellar disc geometry constrained by infrared line fluxes
    Lenorzer et al. introduce ratios of hydrogen infrared recombination lines as a diagnostic tool to constrain the spatial distribution and physical condition of...
  • Publication
    Close binary central stars and the abundance discrepancy - new extreme objects
    Recent work (Corradi et al. 2015; Jones et al. 2016) has shown that the phenomenon of extreme abundance discrepancies, where recombination line abundances...
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    Confirmation of the link between central star binarity and extreme abundance discrepancy factors in planetary nebulae
    It has recently been noted that there seems to be a strong correlation between planetary nebulae with close binary central stars and highly enhanced...
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    Constraints on Circumstellar Material around the Type Ia Supernova 2007af
    Patat et al. recently inferred the existence of circumstellar material around a normal Type Ia supernova (SN Ia) for the first time, finding time-variable Na I...
  • Publication
    Depleted diffuse bands in circumstellar envelopes of post-AGB stars
    We report on new results in the search for diffuse bands, signatures of still unknown origin, in the circumstellar envelopes of evolved (post-AGB) stars.
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    Detection of a Giant Halo Around NGC 7027
    As a parallel result of an IT Project aimed at determining accurate distances to more than 30 planetary nebulae using the extinction-distance method, we report...
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    Diffuse Interstellar Bands in (Proto-) Fullerene-Rich Environments
    The recent infrared detection of fullerenes (C60 and C70) in Planetary Nebulae (PNe) and R Coronae Borealis (RCB) stars offers a beautiful opportunity for...
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    Diffuse interstellar bands in fullerene planetary nebulae: the fullerenes - diffuse interstellar bands connection
    We present high-resolution (R ~ 15 000) VLT/UVES optical spectra of two planetary nebulae (PNe; Tc 1 and M 1-20) where C60 (and C70) fullerenes have already...
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    Disc frequencies for brown dwarfs in the Upper Scorpius OB association: implications for brown dwarf formation theories
    We have investigated the brown dwarf (BD) and stellar disc fractions in the Upper Scorpius (USco) OB association and compared them with several other young...