  It was believed, with little theoretical basis, that the accretion disk (AD)
is destroyed in nova outbursts, and recovers only a few decades later. In my
thesis I tried to find observational signature for the presence of ADs in young
novae. I will discuss two cases:
  1. Nova V1974 Cyg 1992 - we found permanent superhumps about 2.5 years after
the nova eruption. This is a very strong evidence for the presence of the AD
according to the disk - instability model.
  2. Nova V1425 Aql 1995 - photometric features which characterize the
Intermediate Polars systems were detected about 15 months after its discovery.
It is most likely that the accretion is maintained through an AD.
