Tidally-induced warps in protostellar discs

Details Tidally-induced warps in protostellar discs Tidally-induced warps in protostellar discs

1998-10-01

arxiv.org/abs/astro-ph/9810014v1

Astronomy and Astrophysics

Astrophysics

10 pages, LaTeX (including 1 figure), uses paspconf.sty and epsf.sty, to be published in Proceedings of the EC Summer School o

Scientific paper

We review results on the dynamics of warped gaseous discs. We consider tidal perturbation of a Keplerian disc by a companion star orbiting in a plane inclined to the disc. The perturbation induces the precession of the disc, and thus of any jet it could drive. In some conditions the precession rate is uniform, and as a result the disc settles into a warp mode. The tidal torque also leads to the truncation of the disc, to the evolution of the inclination angle (not necessarily towards alignment of the disc and orbital planes) and to a transport of angular momentum in the disc. We note that the spectral energy distribution of such a warped disc is different from that of a flat disc. We conclude by listing observational effects of warps in protostellar discs.

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