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

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Paul Benni Rory Bentley Andrei Berdyugin Svetlana Berdyugina Serge Bergeron Allyson Bieryla Michaela G. Blain Alicia Capetillo Blanco Eva H. L. Bodman Anne Boucher Mark Bradley Stephen M. Brincat Thomas G. Brink John Briol David J. A. Brown J.Budaj A. Burdanov B. Cale Miguel Aznar Carbo R. Castillo Garcia Wendy J Clark Geoffrey C. Clayton James L. Clem Phillip H Coker Evan M. Cook Chris M. Copperwheat J. Curtis R. M. Cutri B. Cseh C. H. Cynamon Alex J. Daniels James R. A. Davenport Hans J. Deeg Roberto De Lorenzo Thomas de Jaeger Jean-Bruno Desrosiers John Dolan D. J. Dowhos Franky Dubois R. Durkee Shawn Dvorak Lynn Easley N. Edwards Tyler G. Ellis Emery Erdelyi Steve Ertel Rafael. G. Farf\'an J. Farihi Alexei V. Filippenko Emma Foxell Davide Gandolfi Faustino Garcia F. Giddens M. Gillon Juan-Luis Gonz\'alez-Carballo C. Gonz\'alez-Fern\'andez J. I. Gonz\'alez Hern\'andez Keith A. Graham Kenton A. Greene J. Gregorio Na'ama Hallakoun Ott\'o Hanyecz G. R. Harp Gregory W. Henry E. Herrero Caleb F. Hildbold D. Hinzel G. Holgado Bernadett Ign\'acz Valentin D. Ivanov E. Jehin Helen E. Jermak Steve Johnston S. Kafka Csilla Kalup Emmanuel Kardasis Shai Kaspi Grant M. Kennedy F. Kiefer C. L. Kielty Dennis Kessler H. Kiiskinen T. L. Killestein Ronald A. King V. Kollar H. Korhonen C. Kotnik R\'eka K\"onyves-T\'oth Levente Kriskovics Nathan Krumm Vadim Krushinsky E. Kundra Francois-Rene Lachapelle D. LaCourse P. Lake Kristine Lam Gavin P. Lamb Dave Lane Marie Wingyee Lau Pablo Lewin Chris Lintott Carey Lisse Ludwig Logie Nicolas Longeard M. Lopez Villanueva E. Whit Ludington A. Mainzer Lison Malo Chris Maloney A. Mann A. Mantero Massimo Marengo Jon Marchant M. J. Martinez Gonz\'alez Joseph R. Masiero Jon C. Mauerhan James McCormac Aaron Mcneely Huan Y. A. Meng Mike Miller Lawrence A. Molnar J. C. Morales Brett M. Morris Matthew W. Muterspaugh David Nespral C. R. Nugent Katherine M. Nugent A. Odasso Derek O'keeffe A. Oksanen John M. O'Meara Andr\'as Ordasi Hugh Osborn John J. Ott J. R. Parks Diego Rodriguez Perez Vance Petriew R. Pickard Andr\'as P\'al P. Plavchan C. Westendorp Plaza Don Pollacco F. Pozo Nu\~nez F. J. Pozuelos Steve Rau Seth Redfield Howard Relles I. Ribas Jon Richards Joonas L. O. Saario Emily J. Safron J. Martin Sallai Kriszti\'an S\'arneczky Bradley E. Schaefer Clea F. Schumer Madison Schwartzendruber Michael H. Siegel Andrew P. V. Siemion Brooke D. Simmons Joshua D. Simon S. Sim\'on-Diaz Michael L. Sitko Hector Socas-Navarro \'A. S\'odor Donn Starkey Iain A. Steele Geoff Stone R.A. Street Tricia Sullivan J. Suomela J. J. Swift Gyula M. Szab\'o R\'obert Szab\'o R\'obert Szak\'ats Tam\'as Szalai Angelle M. Tanner B. Toledo-Padr\'on Tam\'as Tordai Amaury H.M.J. Triaud Jake D. Turner Joseph H. Ulowetz Marian Urbanik Siegfried Vanaverbeke Andrew Vanderburg Kriszti\'an Vida Brad P. Vietje J\'ozsef Vink\'o K. von Braun Elizabeth O. Waagen Dan Walsh Christopher A. Watson R.C. Weir Klaus Wenzel Michael W. Williamson Jason T. Wright M. C. Wyatt Weikang Zheng Gabriella Zsidi

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classification 🌌 astro-ph.SR astro-ph.EP

keywords dipsbrightnessdatafirstmainmaterialmodelsoptically

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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 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 ordinary dust, where much of the material must be optically thin with a size scale <<1um, 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.

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The First Post-Kepler Brightness Dips of KIC 8462852

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