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

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 detect...

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Detalles Bibliográficos
Autores: Reguitti, Andrea, Pastorello, Andrea, Pignata, Giuliano, Fraser, Morgan, Stritzinger, Maximilian, Brennan, S. J., Cai, Y-Z, Elias-Rosa, Nancy, Fugazza, D., Gutiérrez, Claudia P., Kankare, E., Kotak, R., Lundqvist, Peter, Mazzali, Paolo A., Morán, Sebastián, Salmaso, Irene, Tomasella, Lina, Valerin, Giorgio, Kuncarayakti, Hanindyo
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/279988
Acceso en línea:http://hdl.handle.net/10261/279988
Access Level:acceso abierto
Palabra clave:Supernovae: general
Supernovae
individual: SN 2021foa
Descripción
Sumario: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.

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