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The First Post-Kepler Brightness Dips of KIC 8462852

2018; IOP Publishing; Volume: 853; Issue: 1 Linguagem: Inglês

10.3847/2041-8213/aaa405

2041-8213

Tabetha S. Boyajian, R. Alonso, Alex Ammerman, David E.J. Armstrong, A. Asensio Ramos, Khalid Barkaoui, Thomas G. Beatty, Z. Benkhaldoun, Paul Benni, Rory O. Bentley, A. Berdyugin, S. V. 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, D. J. A. Brown, J. Budaj, Artem Burdanov, Bryson Cale, Miguel Aznar Carbo, Rafael Castillo García, Wendy J Clark, Geoffrey C. Clayton, James L. Clem, Phillip H Coker, Evan M. Cook, C. M. Copperwheat, Jason L. Curtis, R. M. Cutri, B. Cseh, Chuck Cynamon, A Daniels, James R. A. Davenport, H. J. Deeg, Roberto De Lorenzo, Thomas de Jaeger, Jean-Bruno Desrosiers, John R. Dolan, D. J. Dowhos, Franky Dubois, Russell I. Durkee, Shawn Dvorak, Lynn Easley, John N. Edwards, Tyler G. Ellis, Emery Erdelyi, Steve Ertel, Rafael. G. Farfán, Jay Farihi, Alexei V. Filippenko, Emma Foxell, D. Gandolfi, F. López García, Frank Giddens, M. Gillon, Juan-Luis González-Carballo, C. Gónzalez-Fernández, J. I. Gónzalez Hernández, Keith A. Graham, Kenton Greene, J. Gregorio, Na’ama Hallakoun, O. Hanyecz, G. R. Harp, Gregory W. Henry, E. Herrero, Caleb F. Hildbold, Dave H Hinzel, G. Holgado, Bernadett Ignácz, Ilya Ilyin, V. D. Ivanov, Emmanuël Jehin, Helen Jermak, Steve Johnston, S. Kafka, Csilla Kalup, E. Kardasis, S. Kaspi, G. M. Kennedy, F. Kiefer, Collin Kielty, Dennis Kessler, Harri Kiiskinen, T. Killestein, Ronald A. King, Vojtech Kollár, H. Korhonen, C. Kotnik, Réka Könyves-Tóth, L. Kriskovics, N. Krumm, V. Krushinsky, E. Kundra, F. R. Lachapelle, Daryll M. LaCourse, P. B. Lake, K. W. F. Lam, Gavin P. Lamb, D. J. Lane, Marie Wingyee Lau, Pablo Lewin, Chris Lintott, C. M. Lisse, Ludwig Logie, Nicolas Longeard, M. Villanueva, E. W. Ludington, A. Mainzer, Lison Malo, Chris Maloney, Andrew W. Mann, A. Mantero, M. Marengo, J. M. Marchant, M. J. Martínez González, J. Masiero, Jon C. Mauerhan, J. McCormac, Aaron McNeely, Huan Meng, M. S. Miller, Lawrence A. Molnar, J. C. Morales, Brett M. Morris, Matthew W. Muterspaugh, D. Nespral, C. R. Nugent, Katherine M. Nugent, Alessandro Odasso, Derek OKeeffe, A. Oksanen, John M. O’Meara, A. Ordasi, H. P. Osborn, John J. Ott, J. R. Parks, D. Pérez, V. Petriew, R. Pickard, András Pál, Peter Plavchan, D. Pollacco, F. Pozo Núñez, F. J. Pozuelos, Steve Rau, Seth Redfield, Howard Relles, I. Ribas, J. Richards, J. Saario, Emily Safron, J. Martin Sallai, K. Sárneczky, Bradley E. Schaefer, Clea F. Schumer, Madison Schwartzendruber, M. H. Siegel, Andrew P. V. Siemion, Brooke Simmons, Joshua D. Simon, S. Simón‐Díaz, Michael L. Sitko, H. Socas‐Navarro, Á. Sódor, Donn Starkey, I. A. Steele, G. Stone, Klaus G. Strassmeier, R. A. Street, Tricia Sullivan, J. Suomela, Jonathan Swift, Gyula M. Szabó, R. Szabó, R. Szakáts, Tamás Szalai, Angelle Tanner, B. Toledo-Padrón, Tamás Tordai, Amaury H. M. J. Triaud, Jake D. Turner, Joseph H. Ulowetz, M. Urbaník, S. Vanaverbeke, Andrew Vanderburg, K. Vida, Brad P. Vietje, J. Vinkó, Kaspar von Braun, Elizabeth O. Waagen, Dan Walsh, C. A. Watson, Ronald C. Weir, Klaus Wenzel, C. Westendorp Plaza, Michael Williamson, Jason T. Wright, M. C. Wyatt, WeiKang Zheng, Gabriella Zsidi,

Gamma-ray bursts and supernovae

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 ≪1 μ 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.