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Stability of black hole accretion disks [PDF]

EPJ Web of Conferences, 2012
We discuss the issues of stability of accretion disks that may undergo the limit-cycle oscillations due to the two main types of thermal-viscous instabilities.
Czerny B., Misra R., Janiuk A., Kunert-Bajraszewska M.   +3 more
doaj   +2 more sources

Active Galactic Nucleus Tori: Potential Birthplace to Millions of Planets

The Astrophysical Journal
The outer regions of AGN disks have temperatures similar to those of circumstellar disks, permitting dust condensation. Therefore, planet formation and growth could be active in these dust tori through similar mechanisms.
Bhupendra Mishra, Wladimir Lyra, Barry McKernan, Mordecai-Mark Mac Low, K. E. Saavik Ford, Harrison E. Cook   +5 more
doaj   +1 more source

Planet-forming disks and their environment across regions and time from the full NIR census★

Astronomy & Astrophysics
The evolution of planet-forming disks and the processes of planet formation influence each other, and both of them are possibly impacted by the local environment.
Garufi A., Ginski C., Benisty M., Vioque M., Winter A., Huang J., Manara C. F., Dominik C.   +7 more
doaj   +1 more source

Electron Heating in the Transrelativistic Perpendicular Shocks of Tilted Accretion Flows

The Astrophysical Journal
General relativistic magnetohydrodynamic (GRMHD) simulations of black hole tilted disks—where the angular momentum of the accretion flow at large distances is misaligned with respect to the black hole spin—commonly display standing shocks within a few to
Lorenzo Sironi, Aaron Tran
doaj   +1 more source

Deep Hα Imaging Survey of IC 348 with the Hubble Space Telescope. I. Accretion Properties of Stellar and Substellar Objects

The Astronomical Journal
Accretion governs the growth of young stars and the early evolution of their circumstellar disks, yet population-level measurements of accretion are often hampered by heterogeneous diagnostics and by samples preferentially selected toward disk-bearing or
Lillian Yushu Jiang, Brendan P. Bowler, Yifan Zhou, Adam L. Kraus, Sean M. Andrews, Lynne A. Hillenbrand, Michael J. Ireland, Zhaohuan Zhu   +7 more
doaj   +1 more source

Spectral Appearance of Self-gravitating Disks Powered by Stellar Objects: Universal Effective Temperature in the Optical Continuum and Application to Little Red Dots

The Astrophysical Journal Letters
We revisit the spectral appearance of extended self-gravitating accretion disks surrounding compact central objects such as supermassive black holes. Using dust-poor opacities, we show that all optically thick disk solutions possess a universal outer ...
Yi-Xian Chen, Hanpu Liu, Ruancun Li, Bingjie Wang, Yilun Ma, Yan-Fei Jiang, Jenny E. Greene, Eliot Quataert, Jeremy Goodman   +8 more
doaj   +1 more source

The Pre-outburst Properties of the FU Ori Object HBC 722

The Astrophysical Journal Letters
FU Ori outbursts are thought to play an important role in stellar assembly and the evolution of protoplanetary disks. However, the progenitor young stellar objects are largely uncharacterized.
Gregory J. Herczeg, Bo Reipurth
doaj   +1 more source

Disk-regulated Mass Transfer between Rotating Nondegenerate Stars: Insights from Be and sdOB Binaries

The Astrophysical Journal
Mass transfer between nondegenerate stars is a fundamental but still poorly understood process in binary evolution. The commonly used rotationally limited accretion prescription in detailed binary evolution simulations that account for stellar rotation ...
Zepei Xing, Tassos Fragos, Vicky Kalogera, Seth Gossage, Kyle Akira Rocha, Emmanouil Zapartas   +5 more
doaj   +1 more source

The ODYSSEUS Survey. Characterizing Magnetospheric Geometries and Hotspot Structures in T Tauri Stars

The Astrophysical Journal
Magnetospheric accretion is a key process that shapes the inner disks of T Tauri stars, controlling mass and angular momentum evolution. It produces strong ultraviolet and optical emission that irradiates the planet-forming environment.
Caeley V. Pittman, Catherine C. Espaillat, Connor E. Robinson, Thanawuth Thanathibodee, Sophia Lopez, Nuria Calvet, Zhaohuan Zhu, Frederick M. Walter, John Wendeborn, Carlo F. Manara, Justyn Campbell-White, Rik Claes, Min Fang, Antonio Frasca, Jorge F. Gameiro, Manuele Gangi, Jesus Hernández, Ágnes Kóspál, Karina Maucó, James Muzerolle, Michał Siwak, Łukasz Tychoniec, Laura Venuti   +22 more
doaj   +1 more source

Nonideal Magnetohydrodynamic Instabilities in Protoplanetary Disks: Vertical Modes and Reflection Asymmetry

The Astrophysical Journal
Magnetized disk winds and wind-driven accretion are an essential and intensively studied dispersion mechanism of protoplanetary disks (PPDs). However, the stability of these mechanisms has yet to be adequately examined.
Lile Wang, Sheng Xu, Zhenyu Wang, Min Fang, Jeremy Goodman   +4 more
doaj   +1 more source