The First Post-Kepler Brightness Dips of KIC 8462852

Boyajian, T.S. and Alonso, R. and Ammerman, A. and Armstrong, D. and Ramos, A.A. and Cseh, Borbála and Kriskovics, Levente and Pál, András and Sárneczky, Krisztián and Sódor, Ádám and Szabó, Gyula and Szabó, Róbert and Szakáts, Róbert and Szalai, Tamás and Vida, Krisztián and Vinkó, József (2018) The First Post-Kepler Brightness Dips of KIC 8462852. ASTROPHYSICAL JOURNAL LETTERS, 853 (1). L8. ISSN 2041-8205


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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 ≪1 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. © 2018. The American Astronomical Society. All rights reserved..

Item Type: Article
Uncontrolled Keywords: STEPS; MISSION; PROGRAM; extinction; POLARIZATION; DUST; PLANET; STAR; TELESCOPE; INTERSTELLAR SILICATE MINERALOGY; stars: peculiar; stars: individual (KIC 8462852); Stars: activity; comets: general
Subjects: Q Science / természettudomány > QB Astronomy, Astrophysics / csillagászat, asztrofizika
Depositing User: MTMT SWORD
Date Deposited: 20 Sep 2018 02:16
Last Modified: 20 Sep 2018 02:16

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