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Protostellar feedback in turbulent fragmentation: consequences for stellar clustering and multiplicity

Guszejnov, Dávid and Hopkins, Philip F. and Krumholz, Mark R. (2017) Protostellar feedback in turbulent fragmentation: consequences for stellar clustering and multiplicity. Monthly Notices of the Royal Astronomical Society, 468 (4). pp. 4093-4106. ISSN 0035-8711. doi:10.1093/mnras/stx725.

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Stars are strongly clustered on both large (∼pc) and small (∼binary) scales, but there are few analytic or even semi-analytic theories for the correlation function and multiplicity of stars. In this paper, we present such a theory, based on our recently developed semi-analytic framework called MISFIT (Minimalistic Star Formation Including Turbulence), which models gravito-turbulent fragmentation, including the suppression of fragmentation by protostellar radiation feedback. We compare the results including feedback to a control model in which it is omitted. We show that both classes of models robustly reproduce the stellar correlation function at >0.01 pc scales, which is well approximated by a power law that follows generally from scale-free physics (turbulence plus gravity) on large scales. On smaller scales, protostellar disc fragmentation becomes dominant over common core fragmentation, leading to a steepening of the correlation function. Multiplicity is more sensitive to feedback: we found that a model with the protostellar heating reproduces the observed multiplicity fractions and mass ratio distributions for both Solar and sub-Solar mass stars (in particular, the brown dwarf desert), while a model without feedback fails to do so. The model with feedback also produces an at-formation period distribution consistent with the one inferred from observations. However, it is unable to produce short-range binaries below the length-scale of protostellar discs. We suggest that such close binaries are produced primarily by disc fragmentation and further decrease their separation through orbital decay.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Guszejnov, Dávid0000-0001-5541-3150
Hopkins, Philip F.0000-0003-3729-1684
Krumholz, Mark R.0000-0003-3893-854X
Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 March 22. Received 2017 March 20; in original form 2016 October 03. Published: 24 March 2017. Support for PFH and DG was provided by an Alfred P. Sloan Research Fellowship, NASA ATP Grant NNX14AH35G, and NSF Collaborative Research Grant no. 1411920 and CAREER grant no. 1455342. MRK is supported by NASA ATP grant NNX15AT06G and Australian Research Council grant DP160100695. Numerical calculations were run on the Caltech compute cluster ‘Zwicky’ (NSF MRI award no. PHY-0960291) and allocation TG-AST130039 granted by the Extreme Science and Engineering Discovery Environment (XSEDE) supported by the NSF.
Group:TAPIR, Astronomy Department
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Australian Research CouncilDP160100695
Subject Keywords:turbulence, binaries: general, stars: formation, galaxies: star clusters: general, galaxies: star formation, cosmology: theory
Issue or Number:4
Record Number:CaltechAUTHORS:20170629-103507286
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Official Citation:Dávid Guszejnov, Philip F. Hopkins, Mark R. Krumholz; Protostellar feedback in turbulent fragmentation: consequences for stellar clustering and multiplicity. Mon Not R Astron Soc 2017; 468 (4): 4093-4106. doi: 10.1093/mnras/stx725
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78691
Deposited By: Tony Diaz
Deposited On:29 Jun 2017 23:42
Last Modified:15 Nov 2021 17:42

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