Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr)
: Brennan SJ, Fraser M, Johansson J, Pastorello A, Kotak R, Stevance HF, Chen TW, Eldridge JJ, Bose S, Brown PJ, Callis E, Cartier R, Dennefeld M, Dong SB, Duffy P, Elias-Rosa N, Hosseinzadeh G, Hsiao E, Kuncarayakti H, Martin-Carrillo A, Monard B, Nyholm A, Pignata G, Sand D, Shappee BJ, Smartt SJ, Tucker BE, Wyrzykowski L, Abbot H, Benetti S, Bento J, Blondin S, Chen P, Delgado A, Galbany L, Gromadzki M, Gutierrez CP, Hanlon L, Harrison DL, Hiramatsu D, Hodgkin ST, Holoien TWS, Howell DA, Inserra C, Kankare E, Kozlowski S, Muller-Bravo TE, Maguire K, McCully C, Meintjes P, Morrell N, Nicholl M, O'Neill D, Pietrukowicz P, Poleski R, Prieto JL, Rau A, Reichart DE, Schweyer T, Shahbandeh M, Skowron J, Sollerman J, Soszynski I, Stritzinger MD, Szymanski M, Tartaglia L, Udalski A, Ulaczyk K, Young DR, van Leeuwen M, van Soelen B
Publisher: OXFORD UNIV PRESS
: 2022
: Monthly Notices of the Royal Astronomical Society
: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
: MON NOT R ASTRON SOC
: 513
: 4
: 5642
: 5665
: 24
: 0035-8711
DOI: https://doi.org/10.1093/mnras/stac1243
: https://academic.oup.com/mnras/article/513/4/5642/6581585
: https://research.utu.fi/converis/portal/detail/Publication/175979184
: https://arxiv.org/abs/2102.09572v1
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 M-V similar to-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 (similar to+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 alpha 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.
