Classical Nova Carinae 2018: discovery of circumbinary iron and oxygen

McLoughlin, Dominic; Blundell, Katherine M.; Lee, Steven

doi:10.1093/mnras/staa651

Cited by 10 publications

(7 citation statements)

References 19 publications

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“…Nova V906 Car (ASASSN-18fv) was discovered in eruption in March 2018 by ASAS-SN (Stanek et al 2018) and peaked at ∼5 mag in the optical. The nova was observed extensively from radio to γ-ray and has already been the topic of multiple studies (Molaro et al 2020;McLoughlin et al 2020;Aydi et al 2020;Pavana et al 2020;Wee et al 2020;Sokolovsky et al 2020). Aydi et al (2020) detected a correlation between flares in its optical and γ-ray light curves, which led them to conclude that shocks are the source of a substantial fraction of the nova optical luminosity (in contrast to the standard picture of a nuclear-burning white dwarf powering the bolometric luminosity).…”

Section: The Spectral Evolution Of Nova V906 Carmentioning

confidence: 99%

“…Recently, McLoughlin et al (2020) suggested the presence of a circumbinary disk rich with Fe and O in nova V906 Car. Their evidence consists of particular emission lines of Fe ii at 5991 Å (46), 6432 Å (40), 6456 Å (74), and 6516 Å (40), in addition to [O i] 6300 Å, which are characterized by double-peaked profiles and mod-est expansion velocities (FWZI ≈ 900 km s −1 ).…”

Section: Circumbinary Material?mentioning

confidence: 99%

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Early spectral evolution of classical novae: consistent evidence for multiple distinct outflows

Aydi,

Chomiuk,

Izzo

et al. 2020

Preprint

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The physical mechanism driving mass ejection during a nova eruption is still poorly understood. Possibilities include ejection in a single ballistic event, a common envelope interaction, a continuous wind, or some combination of these processes. Here we present a study of 12 Galactic novae, for which we have pre-maximum high-resolution spectroscopy. All 12 novae show the same spectral evolution. Before optical peak, they show a slow P Cygni component. After peak a fast component quickly arises, while the slow absorption remains superimposed on top of it, implying the presence of at least two physically distinct flows. For novae with high-cadence monitoring, a third, intermediate-velocity component is also observed.These observations are consistent with a scenario where the slow component is associated with the initial ejection of the accreted material and the fast component with a radiation-driven wind from the white dwarf. When these flows interact, the slow flow is swept up by the fast flow, producing the intermediate component. These colliding flows may produce the γ-ray emission observed in some novae. Our spectra also show that the transient heavy element absorption lines seen in some novae have the same velocity structure and evolution as the other lines in the spectrum, implying an association with the nova ejecta rather than a pre-existing circumbinary reservoir of gas or material ablated from the secondary. While this basic scenario appears to qualitatively reproduce multi-wavelength observations of classical novae, substantial theoretical and observational work is still needed to untangle the rich diversity of nova properties.

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Section: The Spectral Evolution Of Nova V906 Carmentioning

confidence: 99%

Section: Circumbinary Material?mentioning

confidence: 99%

Early spectral evolution of classical novae: consistent evidence for multiple distinct outflows

Aydi,

Chomiuk,

Izzo

et al. 2020

Preprint

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“…The designation of phases for the optical spectroscopic progression of classical novae has typically focused on relatively early-time absorption lines to elucidate what is happening specifically along the line-of-sight to the eruption (McLaughlin 1956). However, a full understanding of the nature and evolution of the classical nova phenomenon necessitates sustained time-resolved studies beyond this regime.…”

Section: Discussionmentioning

confidence: 99%

The onset of jets in classical novae

McLoughlin

Blundell

Lee

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We present two further classical novae, V906 Car and V5668 Sgr, which show jets and accretion disc spectral signatures in their H α complexes throughout the first 1000 d following their eruptions. From extensive densely time-sampled spectroscopy, we measure the appearance of the first high-velocity absorption component in V906 Car, and the duration of the commencement of the main H α emission. We constrain the time taken for V5668 Sgr to transition to the nebular phase using [N ii] 6584 Å. We find these timings to be consistent with the jet and accretion disc model for explaining optical spectral line profile changes in classical novae, and discuss the implications of this model for enrichment of the interstellar medium.

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“…They were first proposed by Williams et al (2008) to originate in a circumbinary disk, fed by an outflow from the companion star. Adding to this McLoughlin et al (2020) arrive at the conclusion of the existence of circumbinary Fe and O for the V906 Car system and claim this reservoir may provide the origin of the THEA lines. The argument for the spectral features not originating in the shell itself is from the lower velocities observed.…”

Section: Introductionmentioning

confidence: 87%

Shock shaping? Nebular Spectroscopy of Nova V906 Carinae

Harvey¹,

Aydi²,

Izzo³

et al. 2023

Preprint

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V906 Carinae was one of the best observed novae of recent times. It was a prolific dust producer and harboured shocks in the early evolving ejecta outflow. Here, we take a close look at the consequences of these early interactions through study of high-resolution UVES spectroscopy of the nebular stage and extrapolate backwards to investigate how the final structure may have formed. A study of ejecta geometry and shaping history of the structure of the shell is undertaken following a spectral line SHAPE model fit. A search for spectral tracers of shocks in the nova ejecta is undertaken and an analysis of the ionised environment. Temperature, density and abundance analyses of the evolving nova shell are presented.

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Classical Nova Carinae 2018: discovery of circumbinary iron and oxygen

Cited by 10 publications

References 19 publications

Early spectral evolution of classical novae: consistent evidence for multiple distinct outflows

Early spectral evolution of classical novae: consistent evidence for multiple distinct outflows

The onset of jets in classical novae

Shock shaping? Nebular Spectroscopy of Nova V906 Carinae

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