Explanipedia

Revisiting the accretion disc spectra of Dwarf Novae and Novalike variables: implications for the standard disc model Open

Gabriella Zsidi, C. J. Nixon, T. Naylor, J. E. Pringle · 2024

Accretion discs are fundamental to much of astronomy. They can occur around stars both young and old, around compact objects they provide a window into the extremes of physics, and around supermassive black holes in galaxy centres they gen…

The Morphology of the Asteroidal Dust around White Dwarf Stars: Optical and Near-infrared Pulsations in G29-38 Open

Ted von Hippel, Jay Farihi, J. L. Provençal, S. J. Kleinman, J. E. Pringle , et al. · 2024

More than 36 yr have passed since the discovery of the infrared excess from circumstellar dust orbiting the white dwarf G29-38, which at 17.5 pc it is the nearest and brightest of its class. The precise morphology of the orbiting dust rema…

On the role of numerical diffusivity in MHD simulations of global accretion disc dynamos Open

C. J. Nixon, Chris C. T. Pringle, J. E. Pringle · 2024

Observations, mainly of outbursts in dwarf novae, imply that the anomalous viscosity in highly ionized accretion discs is magnetic in origin and requires that the plasma ${\beta \sim 1}$ . Until now, most simulations of the magnetic dynamo…

On the role of numerical diffusivity in MHD simulations of global accretion disc dynamos Open

C. J. Nixon, Chris C. T. Pringle, J. E. Pringle · 2023

Observations, mainly of outbursts in dwarf novae, imply that the anomalous viscosity in highly ionized accretion discs is magnetic in origin, and requires that the plasma $β\sim 1$. Until now most simulations of the magnetic dynamo in accr…

A trio of month-long flares in the nova-like variable V704 And Open

Gabriella Zsidi, C. J. Nixon, T. Naylor, J. E. Pringle, K. L. Page · 2023

We present the discovery of an unusual set of flares in the nova-like variable V704 And. Using data from AAVSO, ASAS-SN, and ZTF for the nova-like variable V704 And, we discovered a trio of brightening events that occurred during the high …

A trio of month long flares in the nova-like variable V704 And Open

Gabriella Zsidi, C. J. Nixon, T. Naylor, J. E. Pringle, K. L. Page · 2023

We present the discovery of an unusual set of flares in the nova-like variable V704 And. Using data from AAVSO, ASAS-SN, and ZTF, of the nova-like variable V704 And, we have discovered a trio of brightening events that occurred during the …

Potential effects of stellar winds on gas dynamics in debris disks leading to observable belt winds Open

Quentin Kral, J. E. Pringle, Luca Matrà, P. Thébault · 2022

Context. Gas has been successfully detected in many extrasolar systems around mature stars aged between 10 Myr and ∼1 Gyr that include planetesimal belts. Gas in these mature disks is thought to be released from planetesimals and has been …

Be Star Disks: Powered by a Nonzero Central Torque Open

C. J. Nixon, J. E. Pringle · 2020

Be stars are rapidly rotating B stars with Balmer emission lines that indicate the presence of a Keplerian, rotationally supported, circumstellar gas disk. Current disk models, referred to as “decretion disks,” make use of the zero-torque …

Short Gamma-Ray Bursts and the Decompression of Neutron Star Matter in Tidal Streams Open

C. J. Nixon, Eric R. Coughlin, J. E. Pringle · 2020

Short gamma-ray bursts (sGRBs) are generally thought to result from the merger of two neutron stars or the merger of a neutron star with a black hole. It is becoming standard practice to model these mergers with hydrodynamical simulations …

Emission from elliptical streams of dusty debris around white dwarfs Open

C. J. Nixon, J. E. Pringle, Eric R. Coughlin, Andrew Swan, Jay Farihi · 2020

White dwarfs are routinely observed to have polluted atmospheres, and sometimes significant infrared excesses, that indicate ongoing accretion of circumstellar dust and rocky debris. Typically this debris is assumed to be in the form of a …

Hydrodynamical Simulations of Misaligned Accretion Discs in Binary Systems: Companions tear discs Open

Suzan Doğan, C. J. Nixon, A. R. King, J. E. Pringle, D. Price · 2020

Accretion discs appear in many astrophysical systems. In most cases, these discs are probably not completely axisymmetric. Discs in binary systems are often found to be misaligned with respect to the binary orbit. In this case, the gravita…

Extreme variability in an active galactic nucleus: Gaia16aax Open

G. Cannizzaro, M. Fraser, P. G. Jonker, J. E. Pringle, S. Mattila , et al. · 2020

We present the results of a multiwavelength follow-up campaign for the luminous nuclear transient Gaia16aax, which was first identified in 2016 January. The transient is spatially consistent with the nucleus of an active galaxy at z = 0.25…

Generalized Warped Disk Equations Open

Rebecca G. Martin, Stephen H. Lubow, J. E. Pringle, Alessia Franchini, Zhaohuan Zhu , et al. · 2019

The manner in which warps in accretion disks evolve depends on the magnitude of the viscosity. ... See full text for complete abstract.

On the physical nature of accretion disc viscosity Open

Rebecca G. Martin, C. J. Nixon, J. E. Pringle, Mario Livio · 2019

Instability of warped discs Open

Suzan Doğan, C. J. Nixon, A. R. King, J. E. Pringle · 2018

Accretion discs are generally warped. If a warp in a disc is too large, the disc can ‘break’ apart into two or more distinct planes, with only tenuous connections between them. Further, if an initially planar disc is subject to a strong di…

A self-consistent model for the evolution of the gas produced in the debris disc of β Pictoris Open

Quentin Kral, M. C. Wyatt, R. F. Carswell, J. E. Pringle, Luca Matrà , et al. · 2016

This paper presents a self-consistent model for the evolution of gas produced in the debris disc of β Pictoris. Our model proposes that atomic carbon and oxygen are created from the photodissociation of CO, which is itself released from vo…

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