Astrophysical: Circumstellar matter

  • Publication
    Brown Dwarf Disks at Ages of 5-10 Myr
    We present Spitzer/IRAC and MIPS 24 μm observations for 28 brown dwarfs in the Upper Scorpius (UppSco) region. We find a disk fraction of 10.7%+8.7% -3.3%. One...
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    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...
  • Publication
    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...
  • Publication
    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...
  • Publication
    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...
  • Publication
    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...