Searching for precursor activity of Type IIn Supernovae
arXiv:2403.10398 · doi:10.1051/0004-6361/202348679
Abstract
We conducted a search for luminous outbursts prior to the explosion of Type IIn Supernovae (SNe IIn). We built a sample of 27 objects spectroscopically classified as SNe IIn, all located at . Using deep archival SN fields images taken up to nearly 20 years prior from transient surveys (PTF, ZTF, DES, CHASE) and major astronomical observatories (ESO and NOAO), we found at least one outburst years to months before the explosion of seven SNe IIn, the earliest precursor being 10 years prior to the explosion of SN 2019bxq. The maximum absolute magnitudes of the outbursts range between -11.5 mag and -15 mag, and the eruptive phases last for a few weeks to a few years. The colour measured for three objects during their outburst is relatively red, with ranging between 0.5 and 1.0 mag. This is similar to the colour expected during the eruptions of Luminous Blue Variables. We noticed that the SNe with pre-SN outbursts have light curves with faster decline rates than those that do not show pre-SN outbursts. SN 2011fh is remarkable, as it is still visible 12 years after the luminous SN-like event, indicating that the progenitor possibly survived, or that the interaction is still on-going. We detect precursor activity in 29% of bona-fide SNe~IIn in our sample. However, a quantitative assessment of the observational biases affecting the sample suggests that this fraction underestimates the intrinsic precursor occurrence rate.
arXiv comment14 pages, 13 figures, 2 tables, accepted for publication on A&A
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