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In simulations of a star-disk system in the closest vicinity of a star, we obtain very fast, light ejecta of matter. Those micro-ejections are of small mass and angular momentum flux, and can be launched from a resistive magnetosphere above the disk gap. Shown is the absolute value of toroidal current in code units, in logarithmic color grading. In solid lines are drawn poloidal magnetic field lines, with lines along which magnetic field vector points towards the star painted in black color, and those where the field points in the opposite direction, in white color. Reconnection is ongoing along the boundary sheet between the opposite-directed magnetic fields. The quasi-stationary state is reached, with matter pushed out of the magnetosphere by pressure gradient and magnetic forces, helped by reconnection. Vectors show poloidal velocity, normalized to Keplerian velocity at R=2.8 (for more details, see Cemeljic et al., 2013, ApJ768, 5).
Micro-ejections in star-disk resistive magnetohydrodynamic simulations
A schematic sketch of the evolution in star-disk interaction.
Magnetospheric Accretion and Ejection of Matter in Resistive Magnetohydrodynamic Simulations
In numerical simulations of the star-disk system, after the relaxation, the disk is truncated at the truncation radius R_t. Position of the R_t is close to the line of balance of the disk ram pressure and the magnetic pressure, which is located between a central object and the disk inner radius.
Magnetospheric Accretion and Ejection of Matter in Resistive MHD Simulations
Cemeljic, Miljenko
Visiting Scholar (NCAC, Poland)
photo of Cemeljic, Miljenko
Email: miki_replace2@_tiara.sinica.edu.tw

Education and Positions

  • ASIAA/TIARA, Hsinchu, Taiwan (2007~2008)
  • Marie Curie research Fellow, JETSET collaboration, University of Athens, Greece (2005~2007)
  • Astrophysikalisches Institut Potsdam, Germany (1999~2003)
  • Nicolaus Copernicus Astronomical Center, Warsaw, Poland (1997~1999)
  • University of Potsdam, Germany, PhD (2000~2005)
  • University of Zagreb, Croatia, MS (1988~1996)

Research Interests

MHD Simulations

Journal Papers affiliated with ASIAA

  1. Cemeljic M; Yang H; Yuan F; Shang H, "Formation of episodic jets and associated flares from black hole accretion systems" , ApJ, 2022, Accepted [SCI] ( ADS | Fulltext )
  2. Vinković D; Čemeljić M, "Inner dusty regions of protoplanetary discs - II. Dust dynamics driven by radiation pressure and disc winds" , MNRAS: 500(1), 506-519, Jan, 2021 [SCI] ( ADS | Fulltext )
  3. Čemeljić M; Siwak M, "Light-curve variation caused by accretion column switching stellar hemispheres" , MNRAS: 491(1), 1057-1063, Jan, 2020 [SCI] ( ADS | Fulltext )
  4. Cemeljic M; Huang R-Y, "Magnetic reconnection in a comparison of topology and helicities in two and three dimensional resistive magnetohydrodynamic simulations" , Physics of Plasmas: 21(3), 032121, March, 2014 [SCI] ( ADS | Fulltext )
  5. Cemeljic M; Vlahakis N; Tsinganos K, "Large resistivity in numerical simulations of radially self-similar outflows" , MNRAS: 442(2), 1133-1141, Aug 1, 2014 [SCI] ( ADS | Fulltext )
  6. Cemeljic M; Shang H; Chiang TY, "Magnetospheric accretion and ejection of matter in resistive magnetohydrodynamic simulations" , ApJ: 768(1), 5, May 1, 2013 [SCI] ( ADS | Fulltext )
  7. Cemeljic M; Gracia J; Vlahakis N; Tsinganos K, "Resistive jet simulations extending radially self-similar magnetohydrodynamic models" , MNRAS: 389(3), 1022-1032, Sep, 2008 [SCI] ( ADS | Fulltext )
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