A1 Refereed original research article in a scientific journal
The First Post-Kepler Brightness Dips of KIC 8462852
Authors: Boyajian TS, Alonso R, Ammerman A, Armstrong D, Ramos AA, Barkaoui K, Beatty TG, Benkhaldoun Z, Benni P, Bentley RO, Berdyugin A, Berdyugina S, Bergeron S, Bieryla A, Blain MG, Blanco AC, Bodman EHL, Boucher A, Bradley M, Brincat SM, Brink TG, Briol J, Brown DJA, Budaj J, Burdanov A, Cale B, Carbo MA, Garcia RC, Clark WJ, Clayton GC, Clem JL, Coker PH, Cook EM, Copperwheat CM, Curtis JL, Cutri RM, Cseh B, Cynamon CH, Daniels AJ, Davenport JRA, Deeg HJ, De Lorenzo R, De Jaeger T, Desrosiers JB, Dolan J, Dowhos DJ, Dubois F, Durkee R, Dvorak S, Easley L, Edwards N, Ellis TG, Erdelyi E, Ertel S, Farfan RG, Farihi J, Filippenko AV, Foxell E, Gandolfi D, Garcia F, Giddens F, Gillon M, Gonzalez-Carballo JL, Gonzalez-Fernandez C, Hernandez JIG, Graham KA, Greene KA, Gregorio J, Hallakoun N, Hanyecz O, Harp GR, Henry GW, Herrero E, Hildbold CF, Hinzel D, Holgado G, Ignacz B, Ilyin I, Ivanov VD, Jehin E, Jermak HE, Johnston S, Kafka S, Kalup C, Kardasis E, Kaspi S, Kennedy GM, Kiefer F, Kielty CL, Kessler D, Kiiskinen H, Killestein TL, King RA, Kollar V, Korhonen H, Kotnik C, Konyves-Toth R, Kriskovics L, Krumm N, Krushinsky V, Kundra E, Lachapelle FR, LaCourse D, Lake P, Lam K, Lamb GP, Lane D, Lau MW, Lewin P, Lintott C, Lisse C, Logie L, Longeard N, Villanueva ML, Ludington EW, Mainzer A, Malo L, Maloney C, Mann A, Mantero A, Marengo M, Marchant J, Gonzalez MJM, Masiero JR, Mauerhan JC, McCormac J, McNeely A, Meng HYA, Miller M, Molnar LA, Morales JC, Morris BM, Muterspaugh MW, Nespral D, Nugent CR, Nugent KM, Odasso A, O'Keeffe D, Oksanen A, O'Meara JM, Ordasi A, Osborn H, Ott JJ, Parks JR, Perez DR, Petriew V, Pickard R, Pal A, Plavchan P, Pollacco D, Nunez FP, Pozuelos FJ, Rau S, Redfield S, Relles H, Ribas I, Richards J, Saario JLO, Safron EJ, Sallai JM, Sarneczky K, Schaefer BE, Schumer CF, Schwartzendruber M, Siegel MH, Siemion APV, Simmons BD, Simon JD, Simon-Diaz S, Sitko ML, Socas-Navarro H, Sodor A, Starkey D, Steele IA, Stone G, Strassmeier KG, Street RA, Sullivan T, Suomela J, Swift JJ, Szabo GM, Szabo R, Szakats R, Szalai T, Tanner AM, Toledo-Padron B, Tordai T, Triaud AHMJ, Turner JD, Ulowetz JH, Urbanik M, Vanaverbeke S, Vanderburg A, Vida K, Vietje BP, Vinko J, Von Braun K, Waagen EO, Walsh D, Watson CA, Weir RC, Wenzel K, Plaza CW, Williamson MW, Wright JT, Wyatt MC, Zheng W, Zsidi G
Publisher: IOP PUBLISHING LTD
Publication year: 2018
Journal: Astrophysical Journal Letters
Journal name in source: ASTROPHYSICAL JOURNAL LETTERS
Journal acronym: ASTROPHYS J LETT
Article number: ARTN L8
Volume: 853
Issue: 1
Number of pages: 14
ISSN: 2041-8205
DOI: https://doi.org/10.3847/2041-8213/aaa405
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 mu m, 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.
