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Optical polarizatio...
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Poidevin, F.
(författare)
Optical polarization and spectral properties of the hydrogen-poor superluminous supernovae SN 2021bnw and SN 2021fpl
- Artikel/kapitelEngelska2023
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2023-03-20
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Oxford University Press (OUP),2023
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LIBRIS-ID:oai:DiVA.org:su-227678
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-227678URI
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https://doi.org/10.1093/mnras/stad830DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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New optical photometric, spectroscopic, and imaging polarimetry data are combined with publicly available data to study some of the physical properties of the two hydrogen-poor superluminous supernovae (SLSNe) SN 2021bnw and SN 2021fpl. For each SLSN, the best-fitting parameters obtained from the magnetar model with Modular Open-Source Fitter for Transients do not depart from the range of parameter obtained on other SLSNe discussed in the literature. A spectral analysis with SYN++ shows that SN 2021bnw is a W type, fast evolver, while SN 2021fpl is a 15bn type, slow evolver. The analysis of the polarimetry data obtained on SN 2021fpl at four epochs (+1.8, +20.6, +34.1, and +43.0 d, rest frame) shows >3σ polarization detections in the range of 0.8–1 per cent. A comparison of the spectroscopy data suggests that SN 2021fpl underwent a spectral transition a bit earlier than SN 2015bn, during which, similarly, it could have underwent a polarization transition. The analysis of the polarimetry data obtained on SN 2021bnw does not show any departure from symmetry of the photosphere at an empirical diffusion time-scale of ≈2 (+81.1 d rest frame). This result is consistent with those on the sample of W-type SLSN observed at empirical diffusion time-scale ≤ 1 with that technique, even though it is not clear the effect of limited spectral windows varying from one object to the other. Measurements at higher empirical diffusion time-scale may be needed to see any departure from symmetry as it is discussed in the literature for SN 2017egm.
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Omand, Conor Michael Bruce,1992-Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)coom9840
(författare)
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Könyves-Tóth, Réka
(författare)
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Pérez-Fournon, I.
(författare)
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Clavero, R.
(författare)
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Geier, S.
(författare)
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Jimenez Angel, C.
(författare)
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Marques-Chaves, R.
(författare)
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Shirley, R.
(författare)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)521:4, s. 5418-54390035-87111365-2966
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