Non-grey dimming events of KIC 8462852 from GTC spectrophotometry

@article{Deeg2018NongreyDE,
  title={Non-grey dimming events of KIC 8462852 from GTC spectrophotometry},
  author={Hans J. Deeg and Roi Alonso and David Nespral and T. J. Pearson Inst. de Astrof'isica de Canarias and Universidad de la Laguna and Louisiana State University},
  journal={arXiv: Solar and Stellar Astrophysics},
  year={2018}
}
We report ground-based spectrophotometry of KIC 8462852, during its first dimming events since the end of the Kepler mission. The dimmings show a clear colour-signature, and are deeper in visual blue wavelengths than in red ones. The flux loss' wavelength dependency can be described with an \AA ngstr\"om absorption coefficient of $2.19\pm0.45$, which is compatible with absorption by optically thin dust with particle sizes on the order of 0.0015 to 0.15 $\mu$m. These particles would be smaller… 

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