Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr)

S. J. Brennan*, M. Fraser, J. Johansson, A. Pastorello, R. Kotak, H. F. Stevance, T.-W. Chen, J. J. Eldridge, S Bose, P. J. Brown, E Callis, R Cartier, M Dennefeld, Subo Dong, P Duffy, N Elias-Rosa, G Hosseinzadeh, E Hsiao, H Kuncarayakti, A Martin-CarrilloB Monard, A Nyholm, G Pignata, D Sand, B J Shappee, S. J. Smartt, B. E. Tucker, L Wyrzykowski, H Abbot, S Benetti, J Bento, S Blondin, Ping Chen, A Delgado, L Galbany, M Gromadzki, C P Gutiérrez, L Hanlon, D L Harrison, D Hiramatsu, S T Hodgkin, T W-S Holoien, D A Howell, C. Inserra, E. Kankare, S Kozłowski, T E Müller-Bravo, K. Maguire, C McCully, P Meintjes, N Morrell, M. Nicholl, D O’Neill, P Pietrukowicz, R Poleski, J L Prieto, A Rau, D E Reichart, T Schweyer, M Shahbandeh, J Skowron, J Sollerman, I Soszyński, M D Stritzinger, M Szymański, L Tartaglia, A Udalski, K Ulaczyk, D. R. Young, M van Leeuwen, B van Soelen

*Corresponding author for this work

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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.

Original languageEnglish
Pages (from-to)5642-5665
Number of pages24
JournalMonthly Notices of the Royal Astronomical Society
Volume513
Issue number4
Early online date06 May 2022
DOIs
Publication statusPublished - 01 Jul 2022

Keywords

  • Space and Planetary Science
  • Astronomy and Astrophysics

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