Search: onr:"swepub:oai:DiVA.org:su-218373" >
SN 2017egm :
SN 2017egm : A Helium-rich Superluminous Supernova with Multiple Bumps in the Light Curves
-
Zhu, Jiazheng (author)
-
Jiang, Ning (author)
-
Dong, Subo (author)
-
show more...
-
Filippenko, Alexei V. (author)
-
Rudy, Richard J. (author)
-
Pastorello, A. (author)
-
Ashall, Christopher (author)
-
Bose, Subhash (author)
-
Post, R. S. (author)
-
Bersier, D. (author)
-
Benetti, Stefano (author)
-
Brink, Thomas G. (author)
-
Chen, Ping (author)
-
Dou, Liming (author)
-
Elias-Rosa, N. (author)
-
- Lundqvist, Peter (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
Mattila, Seppo (author)
-
Russell, Ray W. (author)
-
Sitko, Michael L. (author)
-
Somero, Auni (author)
-
Stritzinger, M. D. (author)
-
Wang, Tinggui (author)
-
Brown, Peter J. (author)
-
Cappellaro, E. (author)
-
Fraser, Morgan (author)
-
Kankare, Erkki (author)
-
Moran, S. (author)
-
Prentice, Simon (author)
-
Pursimo, Tapio (author)
-
Reynolds, T. M. (author)
-
Zheng, WeiKang (author)
-
show less...
-
(creator_code:org_t)
- 2023
- 2023
- English.
-
In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 949:1
- Related links:
-
https://doi.org/10.3...
-
show more...
-
https://urn.kb.se/re...
-
https://doi.org/10.3...
-
show less...
Abstract
Subject headings
Close
- When discovered, SN 2017egm was the closest (redshift z = 0.03) hydrogen-poor superluminous supernova (SLSN-I) and a rare case that exploded in a massive and metal-rich galaxy. Thus, it has since been extensively observed and studied. We report spectroscopic data showing strong emission at around He i lambda 10830 and four He i absorption lines in the optical. Consequently, we classify SN 2017egm as a member of an emerging population of helium-rich SLSNe-I (i.e., SLSNe-Ib). We also present our late-time photometric observations. By combining them with archival data, we analyze high-cadence ultraviolet, optical, and near-infrared light curves spanning from early pre-peak (similar to-20 days) to late phases (similar to+300 days). We obtain its most complete bolometric light curve, in which multiple bumps are identified. None of the previously proposed models can satisfactorily explain all main light-curve features, while multiple interactions between the ejecta and circumstellar material (CSM) may explain the undulating features. The prominent infrared excess with a blackbody luminosity of 10(7)-10(8) L (circle dot) detected in SN 2017egm could originate from the emission of either an echo of a pre-existing dust shell or newly formed dust, offering an additional piece of evidence supporting the ejecta-CSM interaction model. Moreover, our analysis of deep Chandra observations yields the tightest-ever constraint on the X-ray emission of an SLSN-I, amounting to an X-ray-to-optical luminosity ratio less than or similar to 10(-3) at late phases (similar to 100-200 days), which could help explore its close environment and central engine.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Zhu, Jiazheng
-
Jiang, Ning
-
Dong, Subo
-
Filippenko, Alex ...
-
Rudy, Richard J.
-
Pastorello, A.
-
show more...
-
Ashall, Christop ...
-
Bose, Subhash
-
Post, R. S.
-
Bersier, D.
-
Benetti, Stefano
-
Brink, Thomas G.
-
Chen, Ping
-
Dou, Liming
-
Elias-Rosa, N.
-
Lundqvist, Peter
-
Mattila, Seppo
-
Russell, Ray W.
-
Sitko, Michael L ...
-
Somero, Auni
-
Stritzinger, M. ...
-
Wang, Tinggui
-
Brown, Peter J.
-
Cappellaro, E.
-
Fraser, Morgan
-
Kankare, Erkki
-
Moran, S.
-
Prentice, Simon
-
Pursimo, Tapio
-
Reynolds, T. M.
-
Zheng, WeiKang
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
- Articles in the publication
-
Astrophysical Jo ...
- By the university
-
Stockholm University