Hitchcock, J; Fossey, SJ; Savnil, G; (2019) Non-gray, Month-long Brightening of KIC 8462852 in the Immediate Aftermath of a Deep Dip. Publications of the Astronomical Society of the Pacific , 131 (1002) , Article 084204. 10.1088/1538-3873/ab254f.

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Abstract

We present an analysis of the results of long-term, multi-band photometric monitoring of the enigmatic star, KIC 8462852. Observations in the B, g', V, r', and I C passbands have been acquired at University College London Observatory between 2017 May and 2018 September. We interrogate the wavelength dependence of the ~month-long dimming and brightening exhibited by the target star over an 85 day interval, immediately following a days-long ~5% drop in brightness on Julian Date (JD) 2,458,203. Between JD 2,458,215–300 we measure brightness variations which correspond to relative extinctions of ${A}_{B}/{A}_{V}=1.39\pm 0.27$, A g'/A V = 1.16 ± 0.11, A r'/A V = 0.80 ± 0.25 and A Ic /A V = 0.49 ± 0.19, from which we infer an Ångström absorption coefficient of 1.33 ± 0.43 (${R}_{V}\simeq {3.2}_{-1.0}^{+2.6}$). As with the days-long "dips", the wavelength dependence of the longer-term brightness variations must also be associated with extinction arising from a dust distribution containing a substantial fraction of submicron-sized grains. This implies some common mechanism is responsible for the star's variability over both these short and longer timescales.

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