Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr). Issue 4 (6th May 2022)

• Record Type: Journal Article
• Authors: 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, Subo; Duffy, 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, Ping; Delgado, A; Galbany, L; Gromadzki, M; Gutiérrez, 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;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 513:Issue 4(2022)
• Page Start: 5642
• Page End: 5665
• Publication Date: 2022-05-06
• Subjects: circumstellar matter -- stars: massive -- supernovae: individual: AT 2016jbu, Gaia16cfr, SN 2009ip; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stac1243
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: 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.