Searching for precursor activity of Type IIn Supernovae
Astronomy & Astrophysics(2024)
摘要
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 z<0.015. 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 g-r
colour measured for three objects during their outburst is relatively red, with
g-r 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
assessment of the observational biases affecting the sample suggests that this
fraction underestimates the intrinsic precursor occurrence rate.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要