A possible mechanism for the formation of tilted disks in intermediate polars

Бисикало, Д. В.; Жилкин, А. Г.; Kaygorodov, P. V.; Ustyugov, V. A.; Montgomery, M. M.

doi:10.1134/s1063772913040021

Cited by 10 publications

(5 citation statements)

References 39 publications

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“…In (Bisikalo et al 2013) it is reported that, when the magnetic field on the white dwarf is fixed in the corotating coordinate system, negative superhumps are seen to exist but their amplitude decays over time. To test whether or not our simulations experience a similar fate, we continued the simulations out to 2,000 orbits for two cases (µ r = 3.6 with q = 0.3 or q = 0.4.)…”

Section: Some Variationsmentioning

confidence: 99%

“…In Lai's 1999 work, while the rate of tilt and the precession rate are developed, the possibility of a magnetic field origin for negative superhumps is not argued rather the main thrust of the paper is directed elsewhere. Recently, Bisikalo et al (2013) have also investigated the presence of a magnetic field on the white dwarf as a potential source of tilted disks in CVs. Their work assumes a white dwarf that is synchronously locked to the orbital period of the binary with the magnetic dipole fixed in the co-rotating frame.…”

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confidence: 99%

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The Emergence of Negative Superhumps in Cataclysmic Variables: Smoothed Particle Hydrodynamics Simulations

Thomas

Wood

2015

ApJ

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Negative superhumps are believed to arise in cataclysmic variable systems when the accretion disk is tilted with respect to the orbital plane. Slow retrograde precession of the line-of-nodes results in a signal-the negative superhump-with a period slightly less than the orbital period. Previous studies have shown that tilted disks exhibit negative superhumps, but a consensus on how a disk initially tilts has not been reached. Analytical work by Lai suggests that a magnetic field on the primary can lead to a tilt instability in a disk when the dipole moment is offset in angle from the spin axis of the primary and when the primary's spin axis is, itself, not aligned with the angular momentum axis of the binary orbit. However, Lai did not apply his work to the formation of negative superhumps. In this paper, we add Lai's model to an existing smoothed particle hydrodynamics code. Using this code, we demonstrate the emergence of negative superhumps in the "light curve" for a range of magnetic dipole moments. We show that the period deficits calculated from these negative superhumps match those in simulations using manually tilted disks. When positive superhumps appear (q 0.33), we show that the period excesses calculated from these signals are also consistent with previous results. Using examples, we show that the disks are tilted, though the tilt varies periodically, and that they precess in the retrograde direction. The magnetic fields found to lead to the emergence of negative superhumps lie in the kilogauss regime.

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Section: Some Variationsmentioning

confidence: 99%

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confidence: 99%

The Emergence of Negative Superhumps in Cataclysmic Variables: Smoothed Particle Hydrodynamics Simulations

Thomas

Wood

2015

ApJ

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“…Intermediate polars give rise to specific types of study associated with the structure of the accretion disk. The influence of the white-dwarf magnetic field leads to the formation of an inclined accretion disk [146]. Such disks have been observed, for example, in the TV Col [147], RR Cha [148], XX Tau [149], and XY Ari systems (and others).…”

Section: Magnetic Cataclysmic Variablesmentioning

confidence: 96%

Scientific problems addressed by the Spektr-UV space project (world space Observatory—Ultraviolet)

et al. 2016

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Abstract-The article presents a review of scientific problems and methods of ultraviolet astronomy, focusing on perspective scientific problems (directions) whose solution requires UV space observatories. These include reionization and the history of star formation in the Universe, searches for dark baryonic matter, physical and chemical processes in the interstellar medium and protoplanetary disks, the physics of accretion and outflows in astrophysical objects, from Active Galactic Nuclei to close binary stars, stellar activity (for both low-mass and high-mass stars), and processes occurring in the atmospheres of both planets in the solar system and exoplanets. Technological progress in UV astronomy achieved in recent years is also considered. The well advanced, international, Russian-led Spektr-UV (World Space Observatory-Ultraviolet) project is described in more detail. This project is directed at creating a major space observatory operational in the ultraviolet (115-310 nm). This observatory will provide an effective, and possibly the only, powerful means of observing in this spectral range over the next ten years, and will be an powerful tool for resolving many topical scientific problems.

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“…This model is based on the equations system of modified magnetic hydrodynamics, which describes astrophysical flows under conditions of a strong external magnetic field. We have successfully applied this approach to modeling the flow structure for both polars and intermediate polars [5,[16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Numerical Modelmentioning

confidence: 99%

Hot Spots Drift in Synchronous and Asynchronous Polars: Results of Three-Dimensional Numerical Simulation

2021

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In this paper, the characteristics of hot spots on an accretor surface are investigated for two types of polars: the eclipsing synchronous polar V808 Aur and the non-eclipsing asynchronous polar CD Ind in configuration of an offset and non-offset magnetic dipole. The drift of hot spots is analyzed based on the results of numerical calculations and maps of the temperature distribution over the accretor surface. It is shown that a noticeable displacement of the spots is determined by the ratio of ballistic and magnetic parts of the jet trajectory. In the synchronous polar, the dominant influence on the drift of hot spots is exerted by variations in the mass transfer rate, which entail a change in the ballistic part of the trajectory. It was found that when the mass transfer rate changes within the range of 10−10M⊙/year to 10−7M⊙/year, the displacement of the hot spot in latitude and longitude can reach 30∘. In the asynchronous polar, a change in the position of hot spots is mainly defined by the properties of the white dwarf magnetosphere, and the displacement of hot spots in latitude and longitude can reach 20∘.

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A possible mechanism for the formation of tilted disks in intermediate polars

Cited by 10 publications

References 39 publications

The Emergence of Negative Superhumps in Cataclysmic Variables: Smoothed Particle Hydrodynamics Simulations

The Emergence of Negative Superhumps in Cataclysmic Variables: Smoothed Particle Hydrodynamics Simulations

Scientific problems addressed by the Spektr-UV space project (world space Observatory—Ultraviolet)

Hot Spots Drift in Synchronous and Asynchronous Polars: Results of Three-Dimensional Numerical Simulation

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