Early evolution of the extraordinary Nova Del 2013 (V339 Del)

Abstract

We determine the temporal evolution of the luminosity L(WD), radius R(WD) and effective temperature Teff of the white dwarf (WD) pseudophotosphere of V339 Del from its discovery to around day 40. Another main objective was studying the ionization structure of the ejecta. These aims were achieved by modelling the optical/near-IR spectral energy distribution (SED) using low-resolution spectroscopy (3500 - 9200 A), UBVRcIc and JHKLM photometry. During the fireball stage (Aug. 14.8 - 19.9, 2013), Teff was in the range of 6000 - 12000 K, R(WD) was expanding non-uniformly in time from around 66 to around 300 (d/3 kpc) R(Sun), and L(WD) was super-Eddington, but not constant. After the fireball stage, a large emission measure of 1.0-2.0E+62 (d/3 kpc)**2 cm**(-3) constrained the lower limit of L(WD) to be well above the super-Eddington value. The evolution of the H-alpha line and mainly the transient emergence of the Raman-scattered O VI 1032 A line suggested a biconical ionization structure of the ejecta with a disk-like H I region persisting around the WD until its total ionization, around day 40. It is evident that the nova was not evolving according to the current theoretical prediction. The unusual non-spherically symmetric ejecta of nova V339 Del and its extreme physical conditions and evolution during and after the fireball stage represent interesting new challenges for the theoretical modelling of the nova phenomenon.

arXiv comment14 pages, 9 figures, 3 tables, accepted for Astronomy and Astrophysics

References in corpus (7)

• An extensive library of 2500-10500 Ang synthetic spectra
• Disentangling the composite continuum of symbiotic binaries I. S-type systems
• On the effect of emission lines on the UBVR photometry
• Structure of the hot object in the symbiotic prototype Z And during its 2000-03 active phase
• Transient jets in the symbiotic prototype Z Andromedae
• Formation of a disk structure in the symbiotic binary AX Per during its 2007-10 precursor-type activity
• Ionization structure of hot components in symbiotic binaries during active phases

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