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SN 2021foa, a transitional event between a Type IIn (SN 2009ip-like) and a Type Ibn supernova

Reguitti, A, Pastorello, A, Pignata, G, Fraser, M, Stritzinger, MD, Brennan, SJ, Cai, YZ, Elias-Rosa, N, Fugazza, D, Gutierrez, CP, Kankare, E, Kotak, R, Lundqvist, P, Mazzali, PA, Moran, S, Salmaso, I, Tomasella, L, Valerin, G and Kuncarayakti, H (2022) SN 2021foa, a transitional event between a Type IIn (SN 2009ip-like) and a Type Ibn supernova. Astronomy and Astrophysics, 662. ISSN 0004-6361

SN 2021foa a transitional event between a Type IIn (SN 2009ip-like) and a Typle Ibn supernova.pdf - Published Version
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Open Access URL: https://doi.org/10.1051/0004-6361/202243340 (Published version)


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 s1) H emission lines that, two weeks later, reveal a complex profile, with a narrow P Cygni on top of an intermediate-width (∼2700 km s1) component. At +12 days, metal lines in emission appear and Hea lines become very strong, with Hea 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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
SWORD Depositor: A Symplectic
Date Deposited: 01 Nov 2022 16:59
Last Modified: 01 Nov 2022 17:00
DOI or ID number: 10.1051/0004-6361/202243340
URI: https://researchonline.ljmu.ac.uk/id/eprint/17997
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