Abstract
Star formation is thought to be triggered by gravitational collapse of the dense cores of molecular clouds. Angular momentum conservation during the collapse results in the progressive increase of the centrifugal force, which eventually halts the inflow of material and leads to the development of a central mass surrounded by a disc. In the presence of an angular momentum transport mechanism, mass accretion onto the central object proceeds through this disc, and it is believed that this is how stars typically gain most of their mass. However, the mechanisms responsible for this transport of angular momentum are not well understood. Although the gravitational field of a companion star or even gravitational instabilities (particularly in massive discs) may play a role, the most general mechanisms are turbulence viscosity driven by the magnetorotational instability (MRI), and outflows accelerated centrifugally from the surfaces of the disc. Both processes are powered by the action of magnetic fields and are, in turn, likely to strongly affect the structure, dynamics, evolutionary path and planet-forming capabilities of their host discs. The weak ionisation of protostellar discs, however, may prevent the magnetic field from effectively coupling to the gas and shear and driving these processes. Here I examine the viability and properties of these magnetically-driven processes in protostellar discs. The results indicate that, despite the weak ionisation, the magnetic field is able to couple to the gas and shear for fluid conditions thought to be satisfied over a wide range of radii in these discs.
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References
Adams, F.C., Lin, D.N.C.: Transport processes and the evolution of disks. In: Levy, E.H., Lunine, J.I. (eds.) Protostars and Planets III, pp. 721–748 (1993)
Adams, F.C., Ruden, S.P., Shu, F.H.: Astrophys. J. 347, 959 (1989)
Andrews, S.M., Williams, J.P.: Astrophys. J. 659, 705 (2007)
Balbus, S.A.: Annu. Rev. Astron. Astrophys. 41, 555 (2003)
Balbus, S.A., Hawley, J.F.: Astrophys. J. 376, 214 (1991)
Balbus, S.A., Hawley, J.F.: Rev. Mod. Phys. 70, 1 (1998)
Balbus, S.A., Hawley, J.F.: Numerical simulations of MHD turbulence in accretion disks. In: Falgarone, E., Passot, T. (eds.) Turbulence and Magnetic Fields in Astrophysics. Lecture Notes in Physics, vol. 614, pp. 329–348. Springer, Berlin (2003)
Blandford, R.D., Payne, D.G.: Mon. Not. R. Astron. Soc. 199, 883 (1982) (BP82)
Brauer, F., Dullemond, C.P., Henning, T.: Astron. Astrophys. J. 480, 859 (2008)
Cabot, W.: Astrophys. J. 465, 874 (1996)
Cabot, W., Pollack, J.B.: Geophys. Astrophys. Fluid Dyn. 64, 97 (1992)
Cabrit, S., Andre, P.: Astrophys. J. Lett. 379, L25 (1991)
Cabrit, S., Edwards, S., Strom, S.E., Strom, K.M.: Astrophys. J. 354, 687 (1990)
Casse, F., Ferreira, J.: Astron. Astrophys. 353, 1115 (2000)
Ciesla, F.J.: Astrophys. J. Lett. 654, L159 (2007)
Cowling, T.G.: Magnetohydrodynamics. Hilger, London (1976)
Desch, S.J., Morris, M.A., Connolly, H.C., Boss, A.P.: Astrophys. J. 725, 692 (2010)
Durisen, R.H., Boss, A.P., Mayer, L., Nelson, A.F., Quinn, T., Rice, W.K.M.: In: Protostars and Planets V, p. 607 (2007)
Dutrey, A., Guilloteau, S., Ho, P.: In: Protostars and Planets V, pp. 495–506 (2007)
Feigelson, E., Townsley, L., Güdel, M., Stassun, K.: In: Protostars and Planets V, pp. 313–328 (2007)
Ferreira, J., Pelletier, G.: Astron. Astrophys. 295, 807 (1995)
Fleming, T., Stone, J.M.: Astrophys. J. 585, 908 (2003)
Frank, J., King, A., Raine, D.: Accretion Power in Astrophysics. Cambridge University Press, Cambridge (1992)
Fromang, S., Terquem, C., Nelson, R.P.: Mon. Not. R. Astron. Soc. 363, 943 (2005)
Glassgold, A.E., Feigelson, E.D., Montmerle, T.: In: Protostars and Planets IV, p. 429 (2000)
Glassgold, A.E., Krstić, P.S., Schultz, D.R.: Astrophys. J. 621, 808 (2005)
Hartigan, P., Edwards, S., Ghandour, L.: Astrophys. J. 452, 736 (1995)
Hayashi, C.: Prog. Theor. Phys. Suppl. 70, 35 (1981)
Igea, J., Glassgold, A.E.: Astrophys. J. 518, 848 (1999)
Ilgner, M., Nelson, R.P.: Astron. Astrophys. 445, 223 (2006)
Johnson, E.T., Goodman, J., Menou, K.: Astrophys. J. 647, 1413 (2006)
Kitamura, Y., Momose, M., Yokogawa, S., Kawabe, R., Tamura, M., Ida, S.: Astrophys. J. 581, 357 (2002)
Königl, A.: Magnetized accretion disks and the origin of bipolar outflows. In: Wickramasinghe, D.T., Bicknell, G.V., Ferrario, L. (eds.) IAU Colloq. 163: Accretion Phenomena and Related Outflows. Astronomical Society of the Pacific Conference Series, vol. 121, p. 551 (1997)
Königl, A., Pudritz, R.E.: In: Protostars and Planets IV, p. 759 (2000)
Königl, A., Salmeron, R.: In: Physical Proceses in Circumstellar Disks Around Young Stars, pp. 283–354. The University of Chicago Press, Chicago (2011) (arXiv:1004.1875v1)
Königl, A., Salmeron, R., Wardle, M.: Mon. Not. R. Astron. Soc. 401, 479 (2010) (KSW10)
Krasnopolsky, R., Königl, A.: Astrophys. J. 580, 987 (2002)
Levy, E.H., Sonett, C.P.: Meteorite magnetism and early solar system magnetic fields. In: Gehrels, T. (ed.) IAU Colloq. 52: Protostars and Planets, pp. 516–532 (1978)
Li, Z.-Y.: Astrophys. J. 465, 855 (1996)
Lin, D.N.C., Papaloizou, J.: Mon. Not. R. Astron. Soc. 191, 37 (1980)
Lin, D.N.C., Papaloizou, J.C.B., Kley, W.: Astrophys. J. 416, 689 (1993)
McCaughrean, M.J., Stapelfeldt, K.R., Close, L.M.: In: Protostars and Planets IV, p. 485 (2000)
Muto, T., Machida, M.N., Inutsuka, S.-I.: Astrophys. J. 679, 813 (2008)
Nakano, T., Umebayashi, T.: Mon. Not. R. Astron. Soc. 218, 663 (1986)
Nishi, R., Nakano, T., Umebayashi, T.: Astrophys. J. 368, 181 (1991)
Norman, C., Heyvaerts, J.: Astron. Astrophys. 147, 247 (1985)
Ogilvie, G.I., Livio, M.: Astrophys. J. 553, 158 (2001)
Pollack, J.B., Hubickyj, O., Bodenheimer, P., Lissauer, J.J., Podolak, M., Greenzweig, Y.: Icarus 124, 62 (1996)
Pringle, J.E.: Annu. Rev. Astron. Astrophys. 19, 137 (1981)
Pudritz, R.E., Ouyed, R., Fendt, C., Brandenburg, A.: Disk winds, jets, and outflows: theoretical and computational foundations. In: Reipurth, B., Jewitt, D., Keil, K. (eds.) Protostars and Planets V, pp. 277–294 (2007)
Rozyczka, M., Spruit, H.C.: Astrophys. J. 417, 677 (1993)
Ryu, D., Goodman, J.: Astrophys. J. 388, 438 (1992)
Salmeron, R., Wardle, M.: Mon. Not. R. Astron. Soc. 345, 992 (2003)
Salmeron, R., Wardle, M.: Mon. Not. R. Astron. Soc. 361, 45 (2005)
Salmeron, R., Wardle, M.: Mon. Not. R. Astron. Soc. 388, 1223 (2008)
Salmeron, R., Königl, A., Wardle, M.: Mon. Not. R. Astron. Soc. 375, 177 (2007)
Salmeron, R., Königl, A., Wardle, M.: Mon. Not. R. Astron. Soc. 412, 1162 (2011) (SKW11)
Sano, T., Stone, J.M.: Astrophys. J. 570, 314 (2002a)
Sano, T., Stone, J.M.: Astrophys. J. 577, 534 (2002b)
Sano, T., Inutsuka, S.I., Turner, N.J., Stone, J.M.: Astrophys. J. 605, 321 (2004)
Semenov, D., Wiebe, D., Henning, T.: Astron. Astrophys. 417, 93 (2004)
Semenov, D., Wiebe, D., Henning, T.: Astrophys. J. Lett. 647, L57 (2006)
Shakura, N.I., Syunyaev, R.A.: Astron. Astrophys. 24, 337 (1973)
Stone, J.M., Balbus, S.A.: Astrophys. J. 464, 364 (1996)
Stone, J.M., Gammie, C.F., Balbus, S.A., Hawley, J.F.: In: Protostars and Planets IV, p. 589 (2000)
Terquem, C.E.J.M.L.J.: Mon. Not. R. Astron. Soc. 341, 1157 (2003)
Turner, N.J., Willacy, K., Bryden, G., Yorke, H.W.: Astrophys. J. 639, 1218 (2006)
Uesugi, M., Akaki, T., Sekiya, M., Nakamura, T., Tsuchiyama, A., Nakano, T., Uesugi, K.: Difficulties of chondrule formation by nebular shock waves. In: Krot, A.N., Scott, E.R.D., Reipurth, B. (eds.) Chondrites and the Protoplanetary Disk. Astronomical Society of the Pacific Conference Series, vol. 341, pp. 893–902 (2005)
Umebayashi, T., Nakano, T.: Publ. Astron. Soc. Jpn. 33, 617 (1981)
Umebayashi, T., Nakano, T.: Mon. Not. R. Astron. Soc. 243, 103 (1990)
Valenti, J.A., Johns-Krull, C.M.: Astrophys. Space Sci. 292, 619 (2004)
Vishniac, E.T., Diamond, P.: Astrophys. J. 347, 435 (1989)
Wardle, M.: Magnetically-driven winds from protostellar disks. In: Wickramasinghe, D.T., Bicknell, G.V., Ferrario, L. (eds.) IAU Colloq. 163: Accretion Phenomena and Related Outflows. Astronomical Society of the Pacific Conference Series, vol. 121, pp. 561–565 (1997)
Wardle, M.: Mon. Not. R. Astron. Soc. 307, 849 (1999)
Wardle, M.: Astrophys. Space Sci. 311, 35 (2007)
Wardle, M., Königl, A.: Astrophys. J. 410, 218 (1993) (WK93)
Wardle, M., Ng, C.: Mon. Not. R. Astron. Soc. 303, 239 (1999)
Wardle, M., Salmeron, R.: arXiv:1103.3562v1 (2011) (WS11)
Watson, A.M., Stapelfeldt, K.R., Wood, K., Ménard, F.: In: Protostars and Planets V, pp. 523–538 (2007)
Wilner, D.J., Lay, O.P.: In: Protostars and Planets IV, p. 509 (2000)
Zanni, C., Ferrari, A., Rosner, R., Bodo, G., Massaglia, S.: Astron. Astrophys. 469, 811 (2007)
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Salmeron, R. Formation of stars and planets: the role of magnetic fields. Astrophys Space Sci 335, 353–371 (2011). https://doi.org/10.1007/s10509-011-0783-x
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DOI: https://doi.org/10.1007/s10509-011-0783-x