Bibliographic Details
| Title: |
SN 2021foa, a transitional event between a Type IIn (SN 2009ip-like) and a Type Ibn supernova |
| Authors: |
Reguitti, A., Pastorello, A., Pignata, G., Fraser, M., Stritzinger, M. D., Brennan, S. J., Cai, Y. -Z., Elias-Rosa, N., Fugazza, D., Gutierrez, C. P., Kankare, E., Kotak, R., Lundqvist, P., Mazzali, P. A., Moran, S., Salmaso, I., Tomasella, L., Valerin, G., Kuncarayakti, H. |
| Source: |
A&A 662, L10 (2022) |
| Publication Year: |
2022 |
| Subject Terms: |
Astrophysics - Solar and Stellar Astrophysics |
| More Details: |
We present photometric and spectroscopic data of the unusual interacting supernova (SN) 2021foa. It rose to an absolute magnitude peak of $M_r=-18$ mag in 20 days. The initial light curve decline shows some luminosity fluctuations before a long-lasting flattening. A faint source ($M_r\sim -14$ mag) was detected in the weeks preceding the main event, showing a slow-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 ($v_{FWHM}\sim$400 km s$^{-1}$) H emission lines, that, two weeks later, reveal a complex profile, with a narrow P Cygni on top of an intermediate-width ($v_{FWHM}\sim$2700 km s$^{-1}$) component. At +12 days metal lines in emission appear, while \Hei lines become very strong, with \Hei~$\lambda$5876 reaching half of the \Ha luminosity, much higher than in previous SN 2009ip-like objects. We propose SN 2021foa to be a transitional event between the H-rich SN 2009ip-like SNe and the He-rich Type Ibn SNe.
Comment: 5 pages, 3 figures, submitted to A&AL after addressing the reviewer's comments |
| Document Type: |
Working Paper |
| DOI: |
10.1051/0004-6361/202243340 |
| Access URL: |
http://arxiv.org/abs/2206.00625 |
| Accession Number: |
edsarx.2206.00625 |
| Database: |
arXiv |
