The long-lived Type IIn SN 2015da: Infrared echoes and strong interaction within an extended massive shell
The long-lived Type IIn SN 2015da: Infrared echoes and strong interaction within an extended massive shell
In this paper we report the results of the first $\sim$four years of spectroscopic and photometric monitoring of the Type IIn supernova SN 2015da (also known as PSN J13522411+3941286, or iPTF16tu). The supernova exploded in the nearby spiral galaxy NGC 5337 in a relatively highly extinguished environment. The transient showed …