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; Paul Benni; Rory O. 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. L. 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. Farfán; J. Farihi; Alexei V. Filippenko; Emma Foxell; Davide Gandolfi; Faustino Garcia; F. Giddens; M. Gillon; Juan Luis González-Carballo; C. González-Fernández; J. I.González Hernández; Keith A. Graham; Kenton A. Greene; J. Gregorio; Na'Ama Hallakoun; Ottó Hanyecz; G. R. Harp; Gregory W. Henry; E. Herrero; Caleb F. Hildbold; D. Hinzel; G. Holgado; Bernadett Ignácz; Ilya Ilyin; 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; Réka Könyves-Tóth; 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 González; 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; András Ordasi; Hugh Osborn; John J. Ott; J. R. Parks; Diego Rodriguez Perez; Vance Petriew; R. Pickard; András Pál; P. Plavchan; Don Pollacco; F. Pozo Nunez; F. J. Pozuelos; Steve Rau; Seth Redfield; Howard Relles; Ignasi Ribas; Jon Richards; Joonas L.O. Saario; Emily J. Safron; J. Martin Sallai; Krisztián Sárneczky; Bradley E. Schaefer; Clea F. Schumer; Madison Schwartzendruber; Michael H. Siegel; Andrew P.V. Siemion; Brooke D. Simmons; Joshua D. Simon; S. Simón-Diaz; Michael L. Sitko; Hector Socas-Navarro; A. Sódor; Donn Starkey; Iain A. Steele; Geoff Stone; Klaus G. Strassmeier; R. A. Street; Tricia Sullivan; J. Suomela; J. J. Swift; Gyula M. Szabó; Róbert Szabó; Róbert Szakáts; Tamás Szalai; Angelle M. Tanner; B. Toledo-Padrón; Tamás Tordai; Amaury H.M.J. Triaud; Jake D. Turner; Joseph H. Ulowetz; Marian Urbanik; Siegfried Vanaverbeke; Andrew Vanderburg; Krisztián Vida; Brad P. Vietje; József Vinkó; K. Von Braun; Elizabeth O. Waagen; Dan Walsh; Christopher A. Watson; R. C. Weir; Klaus Wenzel; C. Westendorp Plaza; Michael W. Williamson; Jason T. Wright; M. C. Wyatt; Weikang Zheng; Gabriella Zsidi

doi:10.3847/2041-8213/aaa405

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, Paul Benni, Rory O. 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. BrincatThomas 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. L. 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. Farfán, J. Farihi, Alexei V. Filippenko, Emma Foxell, Davide Gandolfi, Faustino Garcia, F. Giddens, M. Gillon, Juan Luis González-Carballo, C. González-Fernández, J. I.González Hernández, Keith A. Graham, Kenton A. Greene, J. Gregorio, Na'Ama Hallakoun, Ottó Hanyecz, G. R. Harp, Gregory W. Henry, E. Herrero, Caleb F. Hildbold, D. Hinzel, G. Holgado, Bernadett Ignácz, Ilya Ilyin, 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, Réka Könyves-Tóth, 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 González, 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, András Ordasi, Hugh Osborn, John J. Ott, J. R. Parks, Diego Rodriguez Perez, Vance Petriew, R. Pickard, András Pál, P. Plavchan, Don Pollacco, F. Pozo Nunez, F. J. Pozuelos, Steve Rau, Seth Redfield, Howard Relles, Ignasi Ribas, Jon Richards, Joonas L.O. Saario, Emily J. Safron, J. Martin Sallai, Krisztián Sárneczky, Bradley E. Schaefer, Clea F. Schumer, Madison Schwartzendruber, Michael H. Siegel, Andrew P.V. Siemion, Brooke D. Simmons, Joshua D. Simon, S. Simón-Diaz, Michael L. Sitko, Hector Socas-Navarro, A. Sódor, Donn Starkey, Iain A. Steele, Geoff Stone, Klaus G. Strassmeier, R. A. Street, Tricia Sullivan, J. Suomela, J. J. Swift, Gyula M. Szabó, Róbert Szabó, Róbert Szakáts, Tamás Szalai, Angelle M. Tanner, B. Toledo-Padrón, Tamás Tordai, Amaury H.M.J. Triaud, Jake D. Turner, Joseph H. Ulowetz, Marian Urbanik, Siegfried Vanaverbeke, Andrew Vanderburg, Krisztián Vida, Brad P. Vietje, József Vinkó, K. Von Braun, Elizabeth O. Waagen, Dan Walsh, Christopher A. Watson, R. C. Weir, Klaus Wenzel, C. Westendorp Plaza, Michael W. Williamson, Jason T. Wright, M. C. Wyatt, Weikang Zheng, Gabriella Zsidi

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

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 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.

Original language	English (US)
Article number	L8
Journal	Astrophysical Journal Letters
Volume	853
Issue number	1
DOIs	https://doi.org/10.3847/2041-8213/aaa405
State	Published - Jan 20 2018
Externally published	Yes

Keywords

comets: general
stars: activity
stars: individual (KIC 8462852)
stars: peculia

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.3847/2041-8213/aaa405

Cite this

Boyajian, T. S., Alonso, R., Ammerman, A., Armstrong, D., Ramos, A. A., Barkaoui, K., Beatty, T. G., Benkhaldoun, Z., Benni, P., Bentley, R. O., Berdyugin, A., Berdyugina, S., Bergeron, S., Bieryla, A., Blain, M. G., Blanco, A. C., Bodman, E. H. L., Boucher, A., Bradley, M., ... Zsidi, G. (2018). The First Post-Kepler Brightness Dips of KIC 8462852. Astrophysical Journal Letters, 853(1), [L8]. https://doi.org/10.3847/2041-8213/aaa405

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, Lorenzo, RD, Jaeger, TD, Desrosiers, JB, Dolan, J, Dowhos, DJ, Dubois, F, Durkee, R, Dvorak, S, Easley, L, Edwards, N, Ellis, TG, Erdelyi, E, Ertel, S, Farfán, RG, Farihi, J, Filippenko, AV, Foxell, E, Gandolfi, D, Garcia, F, Giddens, F, Gillon, M, González-Carballo, JL, González-Fernández, C, Hernández, JIG, Graham, KA, Greene, KA, Gregorio, J, Hallakoun, NA, Hanyecz, O, Harp, GR, Henry, GW, Herrero, E, Hildbold, CF, Hinzel, D, Holgado, G, Ignácz, 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, Könyves-Tóth, 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, Martinez González, MJ, 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, Pál, 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, Sárneczky, K, Schaefer, BE, Schumer, CF, Schwartzendruber, M, Siegel, MH, Siemion, APV, Simmons, BD, Simon, JD, Simón-Diaz, S, Sitko, ML, Socas-Navarro, H, Sódor, A, Starkey, D, Steele, IA, Stone, G, Strassmeier, KG, Street, RA, Sullivan, T, Suomela, J, Swift, JJ, Szabó, GM, Szabó, R, Szakáts, R, Szalai, T, Tanner, AM, Toledo-Padrón, B, Tordai, T, Triaud, AHMJ, Turner, JD, Ulowetz, JH, Urbanik, M, Vanaverbeke, S, Vanderburg, A, Vida, K, Vietje, BP, Vinkó, J, Braun, KV, Waagen, EO, Walsh, D, Watson, CA, Weir, RC, Wenzel, K, Plaza, CW, Williamson, MW, Wright, JT, Wyatt, MC, Zheng, W & Zsidi, G 2018, 'The First Post-Kepler Brightness Dips of KIC 8462852', Astrophysical Journal Letters, vol. 853, no. 1, L8. https://doi.org/10.3847/2041-8213/aaa405

@article{af507d0f5c034fa8b174006f23ced861,

title = "The First Post-Kepler Brightness Dips of KIC 8462852",

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 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.",

keywords = "comets: general, stars: activity, stars: individual (KIC 8462852), stars: peculia",

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

note = "Funding Information: A major upgrade of the Kast spectrograph on the Shane 3m telescope at Lick Observatory was made possible through generous gifts from William and Marina Kast as well as the Heising-Simons Foundation. Research at Lick Observatory is partially supported by a generous gift from Google. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration (NASA); the observatory was made possible by the generous financial support of the W. M. Keck Foundation. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by NASA. This publication also makes use of data products from NEOWISE, which is a project of the Jet Propulsion Laboratory/California Institute of Technology, funded by the Planetary Science Division of NASA. Software: emcee (Foreman-Mackey et al. 2013). Funding Information: The LCOGT observations used in this project were made possible by the collective effort of 1762 supporters as part of the Kickstarter campaign “The Most Mysterious Star in the Galaxy.”140 The authors gratefully acknowledge and humbly extend a special thanks for substantial support from Las Cumbres Observatory, Glenn Klakring, Fred Boyajian and Bobbie Staley, Alex Mazingue, The Bible Family, Claudio Bottaccini, Joachim De Lombaert, Amity and Brigid Williams, Kevin Fischer, William Hopkins, Milton Bosch, Zipeng Wang, T.J., D.R., and C.C. The authors thank Peter Foukal for helpful conversations. A.T. wishes to acknowledge her mother, Celeste, for all her love and efforts to help her become an astronomer. A.T. also wishes to thank the Boyajian{\textquoteright}s Star Kickstarter team for electing to name dip “Celeste” after her mom who passed away in 2017 June. Mom would have been pleased and would have “got it.” H.D. acknowledges support from grant ESP2015-65712-C5-4-R of the Spanish Secretary of State for R&D&i (MINECO). This research made use of data acquired with the Gran Telescopio Canarias (GTC), installed at the Spanish Observa-torio del Roque de los Muchachos of the Instituto de Astrof{\'i}sica de Canarias, in the island of La Palma. J.B. acknowledges the support from the VEGA 2/0031/18 and APVV 15-0458 grants. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. E.H.L.B.ʼs research was supported by an appointment to the NASA Postdoctoral Program with the Nexus for Exoplanet System Science, administered by Universities Space Research Association under contract with NASA. A.V.F.ʼs group is grateful for financial assistance from the TABASGO Foundation, the Christopher R. Redlich Fund, Gary and Cynthia Bengier (T.d.J. is a Bengier Postdoctoral fellow), and the Miller Institute for Basic Research in Science (U.C. Berkeley). This project was supported by the National Research, Development and Innovation Fund of Hungary, financed under the K_16 funding scheme (project No. NKFIH K-115709). The research leading to these results has received funding from the ARC grant for Concerted Research Actions, financed by the Wallonia-Brussels Federation. M. Gillon is Research Associate at the Belgian Fonds de la Recherche Scientifique (F.R.S.-FNRS). B.D.S. acknowledges support from the National Aeronautics and Space Administration (NASA) through Einstein Postdoctoral Fellowship Award Number PF5-160143 issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-03060. E.H. and I.R. acknowledge support by the Spanish Ministry of Economy and Competitiveness (MINECO) and the Fondo Europeo de Desarrollo Regional (FEDER) through grant ESP2016-80435-C2-1-R, as well as the support of the Generalitat de Catalunya/ CERCA programme. A.A.R., H.S.N., and M.J.M.G. acknowledge financial support by the Spanish Ministry of Economy and Competitiveness through projects AYA2014-60476-P and AYA2014-60833-P. F.J.P.R is supported by Marie Curie CO-FUND fellowship, co-founded by the University of Li{\`e}ge and the European Union. F.P.N. is supported by grants 950/15 from the Israeli Science Foundation (ISF) and 3555/14-1 fromthe Deutsche Forschungsgemeinschaft (DFG). Funding Information: 144 IRAF is distributed by the National Optical Astronomy Observatory, which is operated by AURA, Inc., under a cooperative agreement with the NSF. 145 https://github.com/ishivvers/TheKastShiv Publisher Copyright: {\textcopyright} 2018. The American Astronomical Society. All rights reserved..",

year = "2018",

month = jan,

day = "20",

doi = "10.3847/2041-8213/aaa405",

language = "English (US)",

volume = "853",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "IOP Publishing Ltd.",

number = "1",

}

TY - JOUR

T1 - The First Post-Kepler Brightness Dips of KIC 8462852

AU - Boyajian, Tabetha S.

AU - Alonso, Roi

AU - Ammerman, Alex

AU - Armstrong, David

AU - Ramos, A. Asensio

AU - Barkaoui, K.

AU - Beatty, Thomas G.

AU - Benkhaldoun, Z.

AU - Benni, Paul

AU - Bentley, Rory O.

AU - Berdyugin, Andrei

AU - Berdyugina, Svetlana

AU - Bergeron, Serge

AU - Bieryla, Allyson

AU - Blain, Michaela G.

AU - Blanco, Alicia Capetillo

AU - Bodman, Eva H.L.

AU - Boucher, Anne

AU - Bradley, Mark

AU - Brincat, Stephen M.

AU - Brink, Thomas G.

AU - Briol, John

AU - Brown, David J.A.

AU - Budaj, J.

AU - Burdanov, A.

AU - Cale, B.

AU - Carbo, Miguel Aznar

AU - Garcia, R. Castillo

AU - Clark, Wendy J.

AU - Clayton, Geoffrey C.

AU - Clem, James L.

AU - Coker, Phillip H.

AU - Cook, Evan M.

AU - Copperwheat, Chris M.

AU - Curtis, J. L.

AU - Cutri, R. M.

AU - Cseh, B.

AU - Cynamon, C. H.

AU - Daniels, Alex J.

AU - Davenport, James R.A.

AU - Deeg, Hans J.

AU - Lorenzo, Roberto De

AU - Jaeger, Thomas De

AU - Desrosiers, Jean Bruno

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N1 - Funding Information: A major upgrade of the Kast spectrograph on the Shane 3m telescope at Lick Observatory was made possible through generous gifts from William and Marina Kast as well as the Heising-Simons Foundation. Research at Lick Observatory is partially supported by a generous gift from Google. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration (NASA); the observatory was made possible by the generous financial support of the W. M. Keck Foundation. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by NASA. This publication also makes use of data products from NEOWISE, which is a project of the Jet Propulsion Laboratory/California Institute of Technology, funded by the Planetary Science Division of NASA. Software: emcee (Foreman-Mackey et al. 2013). Funding Information: The LCOGT observations used in this project were made possible by the collective effort of 1762 supporters as part of the Kickstarter campaign “The Most Mysterious Star in the Galaxy.”140 The authors gratefully acknowledge and humbly extend a special thanks for substantial support from Las Cumbres Observatory, Glenn Klakring, Fred Boyajian and Bobbie Staley, Alex Mazingue, The Bible Family, Claudio Bottaccini, Joachim De Lombaert, Amity and Brigid Williams, Kevin Fischer, William Hopkins, Milton Bosch, Zipeng Wang, T.J., D.R., and C.C. The authors thank Peter Foukal for helpful conversations. A.T. wishes to acknowledge her mother, Celeste, for all her love and efforts to help her become an astronomer. A.T. also wishes to thank the Boyajian’s Star Kickstarter team for electing to name dip “Celeste” after her mom who passed away in 2017 June. Mom would have been pleased and would have “got it.” H.D. acknowledges support from grant ESP2015-65712-C5-4-R of the Spanish Secretary of State for R&D&i (MINECO). This research made use of data acquired with the Gran Telescopio Canarias (GTC), installed at the Spanish Observa-torio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma. J.B. acknowledges the support from the VEGA 2/0031/18 and APVV 15-0458 grants. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. E.H.L.B.ʼs research was supported by an appointment to the NASA Postdoctoral Program with the Nexus for Exoplanet System Science, administered by Universities Space Research Association under contract with NASA. A.V.F.ʼs group is grateful for financial assistance from the TABASGO Foundation, the Christopher R. Redlich Fund, Gary and Cynthia Bengier (T.d.J. is a Bengier Postdoctoral fellow), and the Miller Institute for Basic Research in Science (U.C. Berkeley). This project was supported by the National Research, Development and Innovation Fund of Hungary, financed under the K_16 funding scheme (project No. NKFIH K-115709). The research leading to these results has received funding from the ARC grant for Concerted Research Actions, financed by the Wallonia-Brussels Federation. M. Gillon is Research Associate at the Belgian Fonds de la Recherche Scientifique (F.R.S.-FNRS). B.D.S. acknowledges support from the National Aeronautics and Space Administration (NASA) through Einstein Postdoctoral Fellowship Award Number PF5-160143 issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-03060. E.H. and I.R. acknowledge support by the Spanish Ministry of Economy and Competitiveness (MINECO) and the Fondo Europeo de Desarrollo Regional (FEDER) through grant ESP2016-80435-C2-1-R, as well as the support of the Generalitat de Catalunya/ CERCA programme. A.A.R., H.S.N., and M.J.M.G. acknowledge financial support by the Spanish Ministry of Economy and Competitiveness through projects AYA2014-60476-P and AYA2014-60833-P. F.J.P.R is supported by Marie Curie CO-FUND fellowship, co-founded by the University of Liège and the European Union. F.P.N. is supported by grants 950/15 from the Israeli Science Foundation (ISF) and 3555/14-1 fromthe Deutsche Forschungsgemeinschaft (DFG). Funding Information: 144 IRAF is distributed by the National Optical Astronomy Observatory, which is operated by AURA, Inc., under a cooperative agreement with the NSF. 145 https://github.com/ishivvers/TheKastShiv Publisher Copyright: © 2018. The American Astronomical Society. All rights reserved..

PY - 2018/1/20

Y1 - 2018/1/20

N2 - 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.

AB - 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.

KW - comets: general

KW - stars: activity

KW - stars: individual (KIC 8462852)

KW - stars: peculia

UR - http://www.scopus.com/inward/record.url?scp=85041223676&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85041223676&partnerID=8YFLogxK

U2 - 10.3847/2041-8213/aaa405

DO - 10.3847/2041-8213/aaa405

M3 - Article

AN - SCOPUS:85041223676

SN - 2041-8205

VL - 853

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L8

ER -

The First Post-Kepler Brightness Dips of KIC 8462852

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