Brennan, S.J.Fraser, M.Johansson, J.Pastorello, A.Kotak, R.Stevance, H.F.Chen, T.-W.Eldridge, J.J.Bose, S.Brown, P.J.Callis, E.Cartier, R.Dennefeld, M.Dong, SuboDuffy, P.Elias Rosa, N.Hosseinzadeh, G.Hsiao, E.Kuncarayakti, H.Martin Carrillo, A.Monard, B.Nyholm, A.Pignata, G.Sand, D.Shappee, B.J.Smartt, S.J.Tucker, B.E.Wyrzykowski, L.Abbot, H.Benetti, S.Bento, J.Blondin, S.Chen, PingDelgado, A.Galbany, L.Gromadzki, M.Gutierrez, C.P.Hanlon, L.Harrison, D.L.Hiramatsu, D.Hodgkin, S.T.Holoien, T.W.-S.Howell, D.A.Inserra, C.Kankare, E.Kozłowski, S.Müller Bravo, T.E.Maguire, K.McCully, C.Meintjes, P.Morrell, N.Nicholl, M.O'Neill, D.Pietrukowicz, P.Poleski, R.Prieto, J.L.Rau, A.Reichart, D.E.Schweyer, T.Shahbandeh, M.Skowron, J.Sollerman, J.Soszyński, I.Stritzinger, M.D.Szymański, M.Tartaglia, L.Udalski, A.Ulaczyk, K.Young, D.R.Van Leeuwen, M.Van Soelen, B.2023-11-282023-11-282022-07-01Monthly Notices of the Royal Astronomical Society, Volume 513, Issue 4, Pages 5642 - 5665,July 20220035-8711https://repositorio.unab.cl/xmlui/handle/ria/54195Indexación: Scopus.We present the results from a high-cadence, multiwavelength observation campaign of AT 2016jbu (aka Gaia16cfr), an interacting transient. This data set complements the current literature by adding higher cadence as well as extended coverage of the light-curve evolution and late-time spectroscopic evolution. Photometric coverage reveals that AT 2016jbu underwent significant photometric variability followed by two luminous events, the latter of which reached an absolute magnitude of MV ∼-18.5 mag. This is similar to the transient SN 2009ip whose nature is still debated. Spectra are dominated by narrow emission lines and show a blue continuum during the peak of the second event. AT 2016jbu shows signatures of a complex, non-homogeneous circumstellar material (CSM). We see slowly evolving asymmetric hydrogen line profiles, with velocities of 500 km s-1 seen in narrow emission features from a slow-moving CSM, and up to 10 000 km s-1 seen in broad absorption from some high-velocity material. Late-time spectra (∼+1 yr) show a lack of forbidden emission lines expected from a core-collapse supernova and are dominated by strong emission from H, He i, and Ca ii. Strong asymmetric emission features, a bumpy light curve, and continually evolving spectra suggest an inhibit nebular phase. We compare the evolution of H α among SN 2009ip-like transients and find possible evidence for orientation angle effects. The light-curve evolution of AT 2016jbu suggests similar, but not identical, circumstellar environments to other SN 2009ip-like transients. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.enCircumstellar matterStars: MassiveSupernovae: Individual: AT 2016jbuGaia16cfrSN 2009ipArtículoCC BY 4.0 DEED Atribución 4.0 Internacional10.1093/mnras/stac1243