Study of 2021 outburst of the recurrent nova RS Ophiuchi: Photoionization and morpho-kinematic modelling

Abstract

We present the evolution of the optical spectra of the 2021 outburst of RS Ophiuchi (RS Oph) over about a month after the outburst. The spectral evolution is similar to the previous outbursts. Early spectra show prominent P Cygni profiles of hydrogen Balmer, \ion{Fe}{ii}, and \ion{He}{i} lines. The emission lines were very broad during the initial days, which later became narrower and sharper as the nova evolved. This is interpreted as the expanding shocked material into the winds of the red giant companion. We find that the nova ejecta expanded freely for $\sim 4$ days, and afterward, the shock velocity decreased monotonically with time as $v\propto t^{-0.6}$. The physical and chemical parameters associated with the system are derived using the photoionization code \textsc{cloudy}. The best-fit \textsc{cloudy} model shows the presence of a hot central white dwarf source with a roughly constant luminosity of $\sim$1.00 $\times$ 10${}^{37}$ erg s${}^{-1}$. The best-fit photoionization models yield absolute abundance values by number, relative to solar of He/H $\sim 1.4-1.9$, N/H = $70-95$, O/H = $0.60-2.60$, and Fe/H $\sim 1.0-1.9$ for the ejecta during the first month after the outburst. Nitrogen is found to be heavily overabundant in the ejecta. The ejected hydrogen shell mass of the system is estimated to be in the range of $3.54-3.83\times 10^{-6}{M}_{\odot }$. The 3D morpho-kinematic modelling shows a bipolar morphology and an inclination angle of $i=30^{\circ }$ for the RS Oph binary system.

16 Pages, 7 figures, Accepted for publication in Monthly Notices of the Royal Astronomical Society (MNRAS) on 19 July 2022

References in corpus (18)

• X-Ray Emitting Blast Wave from the Recurrent Nova RS Ophiuchi
• An asymmetric shock wave in the 2006 outburst of the recurrent nova RS Ophiuchi
• 3D simulations of RS Oph: from accretion to nova blast
• Supersoft X-ray Light Curve of RS Ophiuchi (2006)
• Spectroscopic orbits and variations of RS Oph
• 123-321 Models of Classical Novae
• High-resolution X-ray spectroscopy of the evolving shock in the 2006 outburst of RS Ophiuchi
• Three-dimensional modeling of the asymmetric blast wave from the 2006 outburst of RS Ophiuchi: Early X-ray emission
• A near-infrared shock wave in the 2006 outburst of recurrent nova RS Ophiuchi
• The Morphology of the Expanding Ejecta of V2491 Cygni (2008 N.2)
• Metallicity and effective temperature of the secondary of RS Oph
• Optical spectroscopy of the recurrent nova RS Ophiuchi - from the outburst of 2006 to quiescence
• Spitzer and ground-based infrared observations of the 2006 eruption of RS Ophiuchi
• Expanding Bipolar X-ray Structure After the 2006 Eruption of RS Oph
• Infrared observations of the 2006 outburst of the recurrent nova RS Ophiuchi: the early phase
• Optical spectroscopic and polarization properties of 2011 outburst of the recurrent nova T Pyxidis
• Abundance analysis of the recurrent nova RS Ophiuchi (2006 outburst)
• Photoionization modelling of quiescence phase spectra of novae & symbiotic star

Cited by in corpus (14)

• Evidence for multiple shocks from the $\gamma$-ray emission of RS Ophiuchi
• Symbiotic stars in the era of modern ground- and space-based surveys
• Shocks in the outflow of the RS Oph 2021 eruption observed with X-ray gratings
• Study of the fastest classical nova, V1674 Her: Photoionization and Morpho-kinemetic model analysis
• 7Be detection in the 2021 outburst of RS Oph
• Low-frequency radio observations of recurrent nova RS Ophiuchi with MeerKAT and LOFAR
• Infrared spectroscopy of the 2019 eruption of the recurrent nova V3890 Sgr: separation into equatorial and polar winds revealed
• DeGaPe 35: Amateur discovery of a new southern symbiotic star
• Evolution of lithium in the disc of the Galaxy and the role of novae
• High-resolution imaging of the evolving bipolar outflows in symbiotic novae: The case of the RSOphiuchi 2021 nova outburst
• Fate and detectability of rare gas hydride ions in nova ejecta: A case study with nova templates
• Synchrotron emission from double-peaked radio light curves of the symbiotic recurrent nova V3890 Sagitarii
• Unveiling compact planetary nebulae: Broad-band survey analysis and LAMOST confirmation
• Discovery and Detailed Study of the M31 Classical Nova AT 2023tkw: Evidence for Internal Shocks