Protostellar discs formed from turbulent cores

Walch, Stefanie, Naab, T., Whitworth, Anthony Peter ORCID: https://orcid.org/0000-0002-1178-5486, Burkert, A. and Gritschneder, M. 2010. Protostellar discs formed from turbulent cores. Monthly Notices of the Royal Astronomical Society 402 (4) , pp. 2253-2263. 10.1111/j.1365-2966.2009.16058.x

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Abstract

We investigate the collapse and fragmentation of low-mass, trans-sonically turbulent pre-stellar cores, using smoothed particle hydrodynamics simulations. The initial conditions are slightly supercritical Bonnor–Ebert spheres, all with the same density profile, the same mass (MO= 6.1 M⊙) and the same radius (RO= 17 000 au), but having different initial turbulent velocity fields. 400 turbulent velocity fields have been generated, all scaled so that the mean Mach number is . Then, a subset of these (in total 11 setups), having a range of net angular momenta, j, has been evolved. The evolution of these turbulent cores is significantly different from the collapse of a rigidly rotating core. It is not strongly correlated with j. Instead, it is moderated by the formation of filamentary structures due to converging turbulent flows. A high fraction (9 out of 13, ∼69 per cent) of the individual protostars forming from turbulent cores are attended by resolved (R≥ 10 au) protostellar accretion discs, but only a very small fraction (1 out of 9, ∼11 per cent) of these discs is sufficiently cool and extended to develop non-linear gravitational instabilities and fragment. Protostars with discs show two distinct growth modes. They initially grow by direct gravitational collapse, followed by subsequent disc accretion.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Professional Services > Advanced Research Computing @ Cardiff (ARCCA) Schools > Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	hydrodynamics; circumstellar matter; stars: formation; infrared: stars
Publisher:	John Wiley
ISSN:	0035-8711
Last Modified:	19 Oct 2022 08:38
URI:	https://orca.cardiff.ac.uk/id/eprint/18491

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