The first post-Kepler brightness dips of KIC 8462852

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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 2015 October, 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 as follows: (i) there are no apparent changes of the stellar spectrum or polarization during the dips and (ii) the multiband photometry of the dips shows differential reddening favoring non-gray 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 ordinary dust, where much of the material must be optically thin with a size scale Lt1 μm, and may also be consistent with models invoking variations intrinsic to the stellar photosphere. Notably, our data do not place constraints on the color of the longer-term "secular" dimming, which may be caused by independent processes, or probe different regimes of a single process.

Item Type: Journal Article
Journal or Publication Title: Astrophysical Journal Letters
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3103
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 127613
Deposited By: ep_importer_pure
Deposited On: 21 Sep 2018 15:38
Refereed?: Yes
Published?: Published
Last Modified: 18 Feb 2020 04:00
URI: https://eprints.lancs.ac.uk/id/eprint/127613

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