The First Post-Kepler Brightness Dips of KIC 8462852
Tabetha S. Boyajian, Roi Alonso, Alex Ammerman, David Armstrong, A., Asensio Ramos, K. Barkaoui, Thomas G. Beatty, Z. Benkhaldoun, Paul Benni,, Rory Bentley, Andrei Berdyugin, Svetlana Berdyugina, Serge Bergeron, Allyson, Bieryla, Michaela G. Blain, Alicia Capetillo Blanco

TL;DR
This study reports the first observed brightness dips of KIC 8462852 since 2013, indicating dust-related occultations with no spectral or polarization changes, and suggests non-grey extinction consistent with optically thin dust.
Contribution
First detection of brightness dips post-Kepler, with detailed multiband photometry supporting dust occultation models over thick material explanations.
Findings
Dips show differential reddening, indicating non-grey extinction.
No spectral or polarization changes during dips.
Data favor optically thin dust models.
Abstract
We present a photometric detection of the first brightness dips of the unique variable star KIC 8462852 since the end of the Kepler space mission in 2013 May. Our regular photometric surveillance started in October 2015, and a sequence of dipping began in 2017 May continuing on through the end of 2017, when the star was no longer visible from Earth. We distinguish four main 1-2.5% dips, named "Elsie," "Celeste," "Skara Brae," and "Angkor", which persist on timescales from several days to weeks. Our main results so far are: (i) there are no apparent changes of the stellar spectrum or polarization during the dips; (ii) the multiband photometry of the dips shows differential reddening favoring non-grey extinction. Therefore, our data are inconsistent with dip models that invoke optically thick material, but rather they are in-line with predictions for an occulter consisting primarily of…
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