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The luminous and ra...
The luminous and rapidly evolving SN 2018bcc : Clues toward the origin of Type Ibn SNe from the Zwicky Transient Facility
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- Karamehmetoglu, Emir (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Aarhus University, Denmark
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- Fransson, Claes (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Sollerman, Jesper (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Tartaglia, Leonardo (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Taddia, Francesco (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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De, K. (author)
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Fremling, C. (author)
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Bagdasaryan, A. (author)
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- Barbarino, Cristina (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Bellm, E. C. (author)
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Dekany, R. (author)
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Dugas, A. M. (author)
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Giomi, M. (author)
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- Goobar, Ariel (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Graham, M. (author)
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Ho, A. (author)
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Laher, R. R. (author)
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Masci, F. J. (author)
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Neill, J. D. (author)
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Perley, D. (author)
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Riddle, R. (author)
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Rusholme, B. (author)
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Soumagnac, M. T. (author)
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(creator_code:org_t)
- 2021-06-01
- 2021
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 649
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Abstract
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- Context. Supernovae (SNe) Type Ibn are rapidly evolving and bright ( MR;peak similar to 19) transients interacting with He-rich circumstellar material (CSM). SN 2018bcc, detected by the ZTF shortly after explosion, provides the best constraints on the shape of the rising light curve (LC) of a fast Type Ibn.Aims. We used the high-quality data set of SN 2018bcc to study observational signatures of the class. Additionally, the powering mechanism of SN 2018bcc o ffers insights into the debated progenitor connection of Type Ibn SNe.Methods. We compared well-constrained LC properties obtained from empirical models with the literature. We fit the pseudobolometric LC with semi-analytical models powered by radioactive decay and CSM interaction. Finally, we modeled the line profiles and emissivity of the prominent He i lines, in order to study the formation of P-Cygni profiles and to estimate CSM properties.Results. SN 2018bcc had a rise time to peak of the LC of 5:6+0:2 0:1 days in the restframe with a rising shape power-law index close to 2, and seems to be a typical rapidly evolving Type Ibn SN. The spectrum lacked signatures of SN-like ejecta and was dominated by over 15 He emission features at 20 days past peak, alongside Ca and Mg, all with VFWHM similar to 2000 km s 1. The luminous and rapidly evolving LC could be powered by CSM interaction but not by the decay of radioactive 56Ni. Modeling of the He i lines indicated a dense and optically thick CSM that can explain the P-Cygni profiles.Conclusions. Like other rapidly evolving Type Ibn SNe, SN 2018bcc is a luminous transient with a rapid rise to peak powered by shock interaction inside a dense and He-rich CSM. Its spectra do not support the existence of two Type Ibn spectral classes. We also note the remarkable observational match to pulsational pair instability SN models.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- supernovae: general
- supernovae: individual: SN 2018bcc
- supernovae: individual: SN 2006jc
- stars: individual: ZTF18aakuewf
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Karamehmetoglu, ...
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Fransson, Claes
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Sollerman, Jespe ...
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Tartaglia, Leona ...
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Taddia, Francesc ...
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De, K.
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Fremling, C.
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Bagdasaryan, A.
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Barbarino, Crist ...
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Bellm, E. C.
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Dekany, R.
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Dugas, A. M.
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Giomi, M.
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Goobar, Ariel
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Graham, M.
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Ho, A.
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Laher, R. R.
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Masci, F. J.
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Neill, J. D.
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Perley, D.
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Riddle, R.
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Rusholme, B.
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Soumagnac, M. T.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Astronomy and As ...
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Stockholm University