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

Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr)
Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr)
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.
Gaia16cfr, SN 2009ip, circumstellar matter, stars: massive, supernovae: individual: AT 2016jbu
1365-2966
5642-5665
Brennan, S. J.
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Fraser, M.
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Johansson, J.
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Pastorello, A.
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Kotak, R.
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Stevance, H. F.
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Chen, T.-W.
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Eldridge, J. J.
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Bose, S.
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Dennefeld, M.
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Hsiao, E.
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Kuncarayakti, H.
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Martin-Carrillo, A.
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Monard, B.
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Nyholm, A.
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Pignata, G.
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Sand, D.
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Shappee, B. J.
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Smartt, S. J.
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Tucker, B. E.
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Wyrzykowski, L.
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Abbot, H.
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Benetti, S.
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Bento, J.
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Blondin, S.
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Chen, Ping
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Delgado, A.
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Galbany, L.
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Gromadzki, M.
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Gutiérrez, C. P.
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Hanlon, L.
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Harrison, D. L.
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Hiramatsu, D.
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Hodgkin, S. T.
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Holoien, T. W.-S.
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Howell, D. A.
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Inserra, C.
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Kankare, E.
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Kozłowski, S.
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Müller-Bravo, T. E.
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Maguire, K.
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McCully, C.
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Meintjes, P.
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et al.
Brennan, S. J.
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Fraser, M.
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Johansson, J.
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Pastorello, A.
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Kotak, R.
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Stevance, H. F.
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Chen, T.-W.
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Eldridge, J. J.
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Bose, S.
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Brown, P. J.
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Callis, E.
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Cartier, R.
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Dennefeld, M.
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Dong, Subo
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Duffy, P.
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Elias-Rosa, N.
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Hosseinzadeh, G.
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Hsiao, E.
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Kuncarayakti, H.
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Martin-Carrillo, A.
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Monard, B.
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Nyholm, A.
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Pignata, G.
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Sand, D.
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Shappee, B. J.
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Smartt, S. J.
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Tucker, B. E.
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Wyrzykowski, L.
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Abbot, H.
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Benetti, S.
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Bento, J.
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Blondin, S.
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Chen, Ping
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Delgado, A.
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Galbany, L.
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Gromadzki, M.
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Gutiérrez, C. P.
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Hanlon, L.
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Harrison, D. L.
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Hiramatsu, D.
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Hodgkin, S. T.
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Holoien, T. W.-S.
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Howell, D. A.
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Inserra, C.
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Kankare, E.
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Kozłowski, S.
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Müller-Bravo, T. E.
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Maguire, K.
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McCully, C.
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Meintjes, P.
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Brennan, S. J., Fraser, M., Pastorello, A. and Müller-Bravo, T. E. , et al. (2022) Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr). Monthly Notices Of The Royal Astronomical Society, 513 (4), 5642-5665. (doi:10.1093/mnras/stac1243).

Record type: Article

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.

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Accepted/In Press date: 27 April 2022
Published date: 1 July 2022
Additional Information: Publisher Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Keywords: Gaia16cfr, SN 2009ip, circumstellar matter, stars: massive, supernovae: individual: AT 2016jbu

Identifiers

Local EPrints ID: 475542
URI: http://eprints.soton.ac.uk/id/eprint/475542
ISSN: 1365-2966
PURE UUID: 1189e352-521e-4323-a697-d1a1d195763d

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Date deposited: 21 Mar 2023 17:41
Last modified: 16 Mar 2024 22:50

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Contributors

Author: S. J. Brennan
Author: M. Fraser
Author: J. Johansson
Author: A. Pastorello
Author: R. Kotak
Author: H. F. Stevance
Author: T.-W. Chen
Author: J. J. Eldridge
Author: S. Bose
Author: P. J. Brown
Author: E. Callis
Author: R. Cartier
Author: M. Dennefeld
Author: Subo Dong
Author: P. Duffy
Author: N. Elias-Rosa
Author: G. Hosseinzadeh
Author: E. Hsiao
Author: H. Kuncarayakti
Author: A. Martin-Carrillo
Author: B. Monard
Author: A. Nyholm
Author: G. Pignata
Author: D. Sand
Author: B. J. Shappee
Author: S. J. Smartt
Author: B. E. Tucker
Author: L. Wyrzykowski
Author: H. Abbot
Author: S. Benetti
Author: J. Bento
Author: S. Blondin
Author: Ping Chen
Author: A. Delgado
Author: L. Galbany
Author: M. Gromadzki
Author: C. P. Gutiérrez
Author: L. Hanlon
Author: D. L. Harrison
Author: D. Hiramatsu
Author: S. T. Hodgkin
Author: T. W.-S. Holoien
Author: D. A. Howell
Author: C. Inserra
Author: E. Kankare
Author: S. Kozłowski
Author: T. E. Müller-Bravo
Author: K. Maguire
Author: C. McCully
Author: P. Meintjes
Corporate Author: et al.

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