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  The rise and fall of an extraordinary Ca-rich transient - The discovery of ATLAS19dqr/SN 2019bkc

Prentice, S. J., Maguire, K., Flörs, A., Taubenberger, S., Inserra, C., Frohmaier, C., et al. (2020). The rise and fall of an extraordinary Ca-rich transient - The discovery of ATLAS19dqr/SN 2019bkc. Astronomy and Astrophysics, 635: A186. doi:10.1051/0004-6361/201936515.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-8E1D-B Version Permalink: http://hdl.handle.net/21.11116/0000-0006-8E1E-A
Genre: Journal Article

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 Creators:
Prentice, S. J., Author
Maguire, K., Author
Flörs, A.1, Author              
Taubenberger, S.1, Author              
Inserra, C., Author
Frohmaier, C., Author
Chen, T.-W.1, Author              
Anderson, J. P., Author
Ashall, C., Author
Clark, P., Author
Fraser, M., Author
Galbany, L., Author
Gal-Yam, A., Author
Gromadzki, M., Author
Gutiérrez, C. P., Author
James, P. A., Author
Jonker, P. G., Author
Kankare, E., Author
Leloudas, G., Author
Magee, M. R., Author
Nicholl, M., AuthorPursiainen, M., AuthorSkillen, K., AuthorSmartt, S. J., AuthorSmith, K. W., AuthorYoung, D. R., AuthorMazzali, P. A., AuthorVogl, C., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: This work presents the observations and analysis of ATLAS19dqr/SN 2019bkc, an extraordinary rapidly evolving transient event located in an isolated environment, tens of kiloparsecs from any likely host. Its light curves rise to maximum light in 5−6 d and then display a decline of Δm15 ∼ 5 mag. With such a pronounced decay, it has one of the most rapidly evolving light curves known for a stellar explosion. The early spectra show similarities to normal and “ultra-stripped” type Ic SNe, but the early nebular phase spectra, which were reached just over two weeks after explosion, display prominent calcium lines, marking SN 2019bkc as a Ca-rich transient. The Ca emission lines at this phase show an unprecedented and unexplained blueshift of 10 000–12 000 km s−1. Modelling of the light curve and the early spectra suggests that the transient had a low ejecta mass of 0.2−0.4 M and a low kinetic energy of (2−4) × 1050 erg, giving a specific kinetic energy Ek/Mej ∼ 1 [1051 erg]/M. The origin of this event cannot be unambiguously defined. While the abundance distribution used to model the spectra marginally favours a progenitor of white dwarf origin through the tentative identification of Ar II, the specific kinetic energy, which is defined by the explosion mechanism, is found to be more similar to an ultra-stripped core-collapse events. SN 2019bkc adds to the diverse range of physical properties shown by Ca-rich events.

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Language(s): eng - English
 Dates: 2020-04-01
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/201936515
Other: LOCALID: 3237916
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Affiliations:
Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 635 Sequence Number: A186 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1