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

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, Cosimo ORCID: https://orcid.org/0000-0002-3968-4409, Kankare, E, Koz?owski, 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, Soszy?ski, I, Stritzinger, M D, Szyma?ski, M, Tartaglia, L, Udalski, A, Ulaczyk, K, Young, D R, van Leeuwen, M and van Soelen, B 2022. Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr). Monthly Notices of the Royal Astronomical Society 513 (4) , pp. 5642-5665. 10.1093/mnras/stac1243

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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.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Oxford University Press
ISSN:	0035-8711
Date of First Compliant Deposit:	27 January 2023
Date of Acceptance:	13 April 2022
Last Modified:	03 May 2023 07:45
URI:	https://orca.cardiff.ac.uk/id/eprint/156325

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