Title:
Mystery of classical nova V339 Delphini: Long-lasting
Super-Eddington luminosity with Dust Emission

Author:
A. Skopal

Abstract:
Classical nova V339 Del exploded on August 13.9, 2013 (= day zero).
A dramatic evolution of its spectrum was measured during the
transition to the super-soft X-ray stage, from day 35 to day 100
of its life. Models of energy distribution in the nova spectrum
revealed:
(i) The oblate shape of the white dwarf (WD) pseudophotosphere
  with an equatorially concentrated dusty outflow on day 35,
(ii) stopping-down the wind from the WD that caused the steep
  3-4 mag decline during the transition,
(iii) the coexistence of a strong dust emission and the luminous
  (~500 000 solar units) high-temperature (~370 000 K) WD
  photosphere, which constrained the disk-like shaping of
  the dust, and
(iv) the long-lasting super-Eddington luminosity from day 2 to
  at least day 100.
The extreme physical conditions derived from observations of the
classical nova V339 Del represent new challenges for the theoretical
modelling of the nova phenomenon.