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SN 2021foa, a trans...
SN 2021foa, a transitional event between a Type IIn (SN 2009ip-like) and a Type Ibn supernova
- Article/chapterEnglish2022
Publisher, publication year, extent ...
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2022-06-28
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EDP Sciences,2022
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LIBRIS-ID:oai:DiVA.org:su-208358
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-208358URI
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https://doi.org/10.1051/0004-6361/202243340DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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We present photometric and spectroscopic data of the unusual interacting supernova (SN) 2021foa. It rose to an absolute magnitude peak of Mr = −18 mag in 20 days. The initial light curve decline shows some luminosity fluctuations before a long-lasting flattening. A faint source (Mr ∼ −14 mag) was detected in the weeks preceding the main event, showing a slowly rising luminosity trend. The r-band absolute light curve is very similar to those of SN 2009ip-like events, with a faint and shorter duration brightening (‘Event A’) followed by a much brighter peak (‘Event B’). The early spectra of SN 2021foa show a blue continuum with narrow (∼400 km s−1) H emission lines that, two weeks later, reveal a complex profile, with a narrow P Cygni on top of an intermediate-width (∼2700 km s−1) component. At +12 days, metal lines in emission appear and He I lines become very strong, with He I λ5876 reaching half of the Hα luminosity, much higher than in previous SN 2009ip-like objects. We propose that SN 2021foa is a transitional event between the H-rich SN 2009ip-like SNe and the He-rich Type Ibn SNe.
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Pastorello, A.
(author)
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Pignata, G.
(author)
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Fraser, M.
(author)
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Stritzinger, M. D.
(author)
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Brennan, S. J.
(author)
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Cai, Y-Z
(author)
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Elias-Rosa, N.
(author)
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Fugazza, D.
(author)
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Gutierrez, C. P.
(author)
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Kankare, E.
(author)
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Kotak, R.
(author)
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Lundqvist, PeterStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)lundq
(author)
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Mazzali, P. A.
(author)
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Moran, S.
(author)
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Salmaso, I.
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Tomasella, L.
(author)
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Valerin, G.
(author)
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Kuncarayakti, H.
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Astronomy and Astrophysics: EDP Sciences6620004-63611432-0746
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Reguitti, A.
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Pastorello, A.
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Pignata, G.
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Fraser, M.
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Stritzinger, M. ...
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Brennan, S. J.
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Cai, Y-Z
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Elias-Rosa, N.
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Fugazza, D.
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Gutierrez, C. P.
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Kankare, E.
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Kotak, R.
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Lundqvist, Peter
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Mazzali, P. A.
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Moran, S.
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Salmaso, I.
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Tomasella, L.
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Valerin, G.
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Kuncarayakti, H.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Stockholm University