The spectroscopic evolution of the $γ$-ray emitting classical nova Nova Mon 2012. I. Implications for the ONe subclass of classical novae

S. N. Shore; I. De Gennaro Aquino; G. J. Schwarz; T. Augusteijn; C. C. Cheung; F. M. Walter; S. Starrfield

doi:10.1051/0004-6361/201321095

paper

The spectroscopic evolution of the $γ$ -ray emitting classical nova Nova Mon 2012. I. Implications for the ONe subclass of classical novae

arXiv:1303.0404 · doi:10.1051/0004-6361/201321095

Abstract

Nova Mon 2012 was the first classical nova to be detected as a high energy $γ$ -ray transient, by Fermi-LAT, before its optical discovery. We study a time sequence of high resolution optical echelle spectra (Nordic Optical Telescope) and contemporaneous NOT, STIS UV, and CHIRON echelle spectra (Nov 20/21/22). We use [O III] and H $β$ line fluxs to constrain the properties of the ejecta. We derive the structure from the optical and UV line profiles and compare our measured line fluxes for with predictions using Cloudy with abundances from other ONe novae. Mon 2012 is confirmed as an ONe nova. We find E(B-V)=0.85 $\pm$ 0.05 and hydrogen column density $\approx 5 \times 1 0^{21}$ cm $^{- 2}$ . The corrected continuum luminosity is nearly the same in the entire observed energy range as V1974 Cyg, V382 Mon, and Nova LMC 2000 at the same epoch after outburst. The distance, about 3.6 kpc, is quite similar to V1974 Cyg. The line profiles can be modeled using an axisymmetric bipolar geometry for the ejecta with various inclinations of the axis to the line of sight, 60 \le i \le 80 degrees, an opening angle of \approx $70 d e g, inn er r a d i u s$ ΔR/R(t)\approx 0.4 $f or p er mi tt e d l in es an d l ess f i l l e df or f or bi dd e n l in es . T h e f i l l in g f a c t or$ f\approx 0.1-0.3 $im pl y in g M (e j ec t a)$ \leq 6\times 10^{-5} $M$ _\odot $. T h e O N e n o v a e a pp e a r t oco m p r i se a s in g l e p h y s i c a l c l a ss w i t hbi p o l a r hi g hma sse j ec t a, s imi l a r l y e nhan ce d ab u n d an ces, an d a co mm o n s p ec t r osco p i ce v o l u t i o n w i t hinana r r o w r an g eo f l u min os i t i es . T h e d e t ec t e d$ γ$-ray emission may be a generic phenomenon, common to all ONe novae, possibly to all classical novae, and connected with acceleration and emission processes within the ejecta (abstract severely truncated).

Submitted to A&A 9/1/2013; Accepted 27/2/2013 (in press)

The spectroscopic evolution of the $γ$ -ray emitting classical nova Nova Mon 2012. I. Implications for the ONe subclass of classical novae

Abstract

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The spectroscopic evolution of the γ-ray emitting classical nova Nova Mon 2012. I. Implications for the ONe subclass of classical novae

Abstract

References in corpus (6)

Cited by in corpus (43)

The spectroscopic evolution of the $γ$ -ray emitting classical nova Nova Mon 2012. I. Implications for the ONe subclass of classical novae