ASAS J071404+7004.3 – a close, bright nova-like cataclysmic variable with gusty winds

Inight, Keith; Gänsicke, B. T.; D., Blondel,; Boyd, David; Ashley, R. P.; Knigge, Christian; Long, Knox S.; Marsh, T. R.; McCleery, J.; Scaringi, Simone; Steeghs, D.; Thorstensen, J. R.; Vanmunster, T.; Wheatley, P. J.

doi:10.1093/mnras/stab3662

Cited by 12 publications

(8 citation statements)

References 111 publications

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“…However, Patterson et al (1996) did not observe any clear correlation between the orbital phase and the presence of optical winds in BZ Cam. Likewise, no correlation was detected in ASAS J071404+7004.3 (Inight et al 2022), while the phase coverage presented by Ringwald & Naylor (1998) and Kafka et al (2003) in BZ Cam and Q Cyg, respectively, was not wide enough (poor overlapping coverage) to test the dependency scenario. The sampling of our database and the lack of absolute ephemeris prevent us from properly testing these claims.…”

Section: Observational Properties Of the Disc Windsmentioning

confidence: 89%

“…Another interesting aspect to consider is the geometry of the wind. Given that P Cygni profiles have been preferentially observed in low-inclination systems (see, however, Inight et al 2022), it is traditionally assumed that AWD winds are bipolar (e.g. Honeycutt et al 1986;Drew 1987).…”

Section: Outflows In Awds Versus Xrbsmentioning

confidence: 99%

“…However, if the radiation comes mainly from the compact star, the wind would be more equatorial. In addition, it is worth noting that a number of numerical simulations were able to (roughly) reproduce the spectra of high-inclination AWDs by considering biconical outflow geometries (Knigge & Drew 1997;Noebauer et al 2010;Matthews et al 2015;Inight et al 2022).…”

Section: Outflows In Awds Versus Xrbsmentioning

confidence: 99%

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Unveiling optical signatures of outflows in accreting white dwarfs

Cúneo,

Muñoz-Darias,

Jiménez-Ibarra

et al. 2023

A&A

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Accreting white dwarfs are known to show signatures of wind-type outflows in the ultraviolet. However, at optical wavelengths, wind detections have only been reported for a few sources. We present GTC-10.4 m optical spectroscopy of four accreting white dwarfs (BZ Cam, V751 Cyg, MV Lyr, and V425 Cas) observed during luminous epochs, when their optical emission is expected to be dominated by the accretion disc. Our analysis focuses on four emission lines: Hα and He Iλ5876, λ6678, and λ7065. Line profiles are complex and variable on short (minutes) and long (days to weeks) timescales, with transient absorption and emission components. Among them, we detect strong blueshifted absorptions at ≳1000 km s−1. These high-velocity components, present only in the blue wing of the emission lines, are observed in all four sources and could be associated with accretion disc winds. For MV Lyr and V425 Cas, these would represent the first detection of optical outflows in these objects, while in the cases of BZ Cam and V751 Cyg, the presence of outflows has been previously reported. This study suggests that, in addition to ultraviolet winds, optical outflows might also be common in accreting white dwarfs. We discuss the observational properties of these winds and their possible similarity to those detected in accreting black holes and neutrons stars.

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Section: Observational Properties Of the Disc Windsmentioning

confidence: 89%

Section: Outflows In Awds Versus Xrbsmentioning

confidence: 99%

Section: Outflows In Awds Versus Xrbsmentioning

confidence: 99%

See 1 more Smart Citation

Unveiling optical signatures of outflows in accreting white dwarfs

Cúneo,

Muñoz-Darias,

Jiménez-Ibarra

et al. 2023

A&A

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“…On the other hand, Inight et al (2022) recently detected a wind in the optical spectra of the novalike variable ASAS J071404+7004.3 in the form of a P Cygni profile in He I λ5876. All emission lines in that system are single peaked.…”

Section: Accretion Disk Windmentioning

confidence: 99%

The Evolution of the Optical Spectrum of V455 Andromedae throughout the 2007 Superoutburst

Tovmassian

Gänsicke

Echevarría

et al. 2022

ApJ

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V455 And is a dwarf nova with a short orbital period, close to the orbital period minimum. The object underwent its first detected outburst in 2007, brightening from around V = 16.5 all the way to magnitude 8. Outbursts of such amplitude occur exclusively in dwarf novae with short periods (typically P orb ≲ 90 minutes) and are called superoutbursts. The recurrence time of superoutbursts is long (decades), hence only very few have been studied in detail. We succeeded in observing the entire superoutburst of V455 And spectroscopically from the rise to the decline with unprecedented detail. While the light curve of the object throughout the outburst does not seem to differ much from other dwarf novae, its spectroscopic behavior is strikingly different during the transition stage from the absorption-dominated lines to the strong emission one during the rise. We interpret the emergence of the strong emission lines with little radial velocity variations during the superoutburst as evidence of wind from the evaporating disk in this high-inclination system. The evolution of the line profiles from wide to narrow peak separation during the rise, and back at the decline, matches models showing that the peak separation is a function of optical depth in the lines.

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“…CVs with known orbital periods are also important for such binary evolution studies, these enable the masses and radii of the individual stars to be determined. The orbital period can be deduced in the SU UMa dwarf nova subtypes from an eruption induced periodic 'superhump' variation in the light curve (Patterson et al 2005); from radial velocity variations in spectral lines (Inight et al 2021); or in eclipsing systems via the periodic occultation of the WD and accretion disc by the donor (Copperwheat et al 2010). The exploration of wide field survey photometry with ML techniques provides an avenue for the discovery of many more of these transients.…”

Section: Introductionmentioning

confidence: 99%

Machine learning-based search for cataclysmic variables within Gaia Science Alerts

Mistry

Copperwheat

Darnley

et al. 2022

Monthly Notices of the Royal Astronomical Society

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Wide-field time domain facilities detect transient events in large numbers through difference imaging. For example, Zwicky Transient Facility, produces alerts for hundreds of thousands of transient events per night, a rate set to be dwarfed by the upcoming Vera Rubin Observatory. The automation provided by Machine Learning (ML) is therefore necessary to classify these events and select the most interesting sources for follow-up observations. Cataclysmic Variables (CVs) are a transient class that are numerous, bright and nearby, providing excellent laboratories for the study of accretion and binary evolution. Here we focus on our use of ML to identify CVs from photometric data of transient sources published by the Gaia Science Alerts program (GSA) - a large, easily accessible resource, not fully explored with ML. Use of light curve feature extraction techniques and source metadata from the Gaia survey resulted in a Random Forest model capable of distinguishing CVs from supernovae, Active Galactic Nuclei and Young Stellar Objects with a 92 per cent precision score and an 85 per cent hit rate. Of 13,280 sources within GSA without an assigned transient classification our model predicts the CV class for ∼2800. Spectroscopic observations are underway to classify a statistically significant sample of these targets to validate the performance of the model. This work puts us on a path towards the classification of rare CV subtypes from future wide field surveys such as the Legacy Survey of Space and Time.

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ASAS J071404+7004.3 – a close, bright nova-like cataclysmic variable with gusty winds

Cited by 12 publications

References 111 publications

Unveiling optical signatures of outflows in accreting white dwarfs

Unveiling optical signatures of outflows in accreting white dwarfs

The Evolution of the Optical Spectrum of V455 Andromedae throughout the 2007 Superoutburst

Machine learning-based search for cataclysmic variables within Gaia Science Alerts

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