期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 502, 期 2, 页码 2120-2139出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa4035
关键词
Transients: supernovae; supernova: general; supernovae: individual: SN 2017gci
资金
- PRIN-INAF 2017
- NSF [AST1911225, AST-1813176, AST-2008108]
- CONICYT PFCHA/DOCTORADOBECAS CHILE/2017 [72180113]
- Polish NCN MAESTRO [2014/14/A/ST9/00121]
- Alexander von Humboldt Foundation
- EU [842471]
- European Union [839090]
- European Funds for Regional Development (FEDER) [PGC2018-095317-B-C21]
- VILLUM FONDEN [19054]
- Royal Astronomical Society Research Fellowship
- Marie Sklodowska-Curie Individual Fellowship within the Horizon 2020 European Union (EU) Framework Programme for Research and Innovation [H2020-MSCA-IF-2017-794467]
- National Science Foundation [AST-1909796, AST-1238877]
- University of Arizona [2018A-UAO-G16]
- Smithsonian Institution [2018A-UAO-G16]
- National Aeronautics and Space Administration [NW440, NNX08AR22G, NNX12AR65G, NNX14AM74G]
- W. M. Keck Foundation
- Northwestern University
- Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA)
- European Organisation for Astronomical Research in the Southern Hemisphere [199.D-0143, 0100.D-0751(B), 0101.D-0199(B), 099.A-9025(A), 0100.A-9099(A)099.A-9099, 0100.A-9099]
- DFG [HA 1850/28-1]
- NASA [NNX12AR55G, 80NSSC19k1639]
- Google Summer of Code initiative
- ESA's Summer of Code in Space program
- EU/FP7ERC [615929]
- Marie Curie Actions (MSCA) [842471] Funding Source: Marie Curie Actions (MSCA)
The optical spectrophotometric observations of the nearby Type I superluminous supernova SN 2017gci reveal features that suggest a continuum distribution between slow- and fast-evolving SLSN I subclasses. The analysis of multiband light curves and synthetic LC fittings support the hypothesis that late interactions between ejecta and circumstellar material may be the power source for this supernova. Additionally, models suggest a possible progenitor star mass of 40 solar masses and either a magnetar or CSM interaction powering the SN 2017gci.
We present and discuss the optical spectrophotometric observations of the nearby (z = 0.087) Type I superluminous supernova (SLSN I) SN 2017gci, whose peak K-corrected absolute magnitude reaches M-g = -21.5 mag. Its photometric and spectroscopic evolution includes features of both slow- and of fast-evolving SLSN I, thus favoring a continuum distribution between the two SLSN-I subclasses. In particular, similarly to other SLSNe I, the multiband light curves (LCs) of SN 2017gci show two re-brightenings at about 103 and 142 d after the maximum light. Interestingly, this broadly agrees with a broad emission feature emerging around 6520 angstrom after similar to 51 d from the maximum light, which is followed by a sharp knee in the LC. If we interpret this feature as H alpha, this could support the fact that the bumps are the signature of late interactions of the ejecta with a (hydrogen-rich) circumstellar material. Then we fitted magnetar- and CSM-interaction-powered synthetic LCs on to the bolometric one of SN 2017gci. In the magnetar case, the fit suggests a polar magnetic field B-p similar or equal to 6 x 10(14) G, an initial period of the magnetar P-initial similar or equal to 2.8 ms, an ejecta mass M-ejecta similar or equal to 9M(circle dot) and an ejecta opacity kappa similar or equal to 0.08 cm(2) g(-1). A CSM-interaction scenario would imply a CSM mass similar or equal to 5 M-circle dot and an ejecta mass similar or equal to 12M(circle dot). Finally, the nebular spectrum of phase + 187 d was modeled, deriving a mass of similar or equal to 10 M-circle dot for the ejecta. Our models suggest that either a magnetar or CSM interaction might be the power sources for SN 2017gci and that its progenitor was a massive (40 M-circle dot) star.
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