Monday

Novae are the result of a thermonuclear eruption on the surface of a white dwarf (WD) within an accreting binary. Recurrent novae (RNe) are systems that have been observed in outburst more than once and contain high mass WDs with high mass accretion rates. M31N 2008-12a (12a) is the current record holder for having the shortest time between eruptions, approximately one year. This rapidly recurring nova is surrounded by a vast nova super-remnant (NSR), orders of magnitude larger than any other nova shell known, and currently one of a kind. Hydrodynamical simulations have been used to show that such a structure can be grown from hundreds of thousands of previous RN eruptions, through the continual sweeping up of the surrounding interstellar medium (ISM). Additionally, the WD belonging to 12a is growing in mass and is close to the Chandrasekhar limit therefore NSRs could be indicators of potential past or upcoming type Ia supernovae.

In this talk, I will present the results of an ongoing study to determine whether the NSR associated with 12a is unique or is simply the first to be found. This study involved running a suite of hydrodynamical simulations to find relationships between the underlying nova system parameters such as white dwarf temperature and mass accretion rate as well as ISM density, with the radial size of the remnant, alongside predictions of emission characteristics, to aid the search for more of these NSRs in the Galaxy and beyond.