Usually, a white dwarf, the expiring star is ripped apart from the supernova. However, as per a statement of NASA, it has been found by a new study that the remnant white dwarf was actually left behind by this event. SN 20127 is the supernova in question and this was left 110 million light-years away in Galaxy NGC 1309.
Firstly, the Lick Observatory Supernova Search observed the Supernova in the month of January 2012. Fortunately, the NGC 1309 was being watched by the Hubble Space Telescope for several years before the even. A comparison can be made between before and after images.