Spatial differences between stars and brown dwarfs: a dynamical origin? - Archive ouverte HAL Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2014

Spatial differences between stars and brown dwarfs: a dynamical origin?

, (1)
1

Abstract

We use N-body simulations to compare the evolution of spatial distributions of stars and brown dwarfs in young star-forming regions. We use three different diagnostics: the ratio of stars to brown dwarfs as a function of distance from the region's centre, {R}_SSR, the local surface density of stars compared to brown dwarfs, ΣLDR, and we compare the global spatial distributions using the ΛMSR method. From a suite of 20 initially statistically identical simulations, 6/20 attain {R}_SSR ≪ 1 and ΣLDR ≪ 1 and ΛMSR ≪ 1, indicating that dynamical interactions could be responsible for observed differences in the spatial distributions of stars and brown dwarfs in star-forming regions. However, many simulations also display apparently contradictory results - for example, in some cases the brown dwarfs have much lower local densities than stars (ΣLDR ≪ 1), but their global spatial distributions are indistinguishable (ΛMSR = 1) and the relative proportion of stars and brown dwarfs remains constant across the region ({R}_SSR = 1). Our results suggest that extreme caution should be exercised when interpreting any observed difference in the spatial distribution of stars and brown dwarfs, and that a much larger observational sample of regions/clusters (with complete mass functions) is necessary to investigate whether or not brown dwarfs form through similar mechanisms to stars.
Fichier principal
Vignette du fichier
stu615.pdf (513.76 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03618569 , version 1 (24-03-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Richard J. Parker, Morten Andersen. Spatial differences between stars and brown dwarfs: a dynamical origin?. Monthly Notices of the Royal Astronomical Society, 2014, 441, pp.784-789. ⟨10.1093/mnras/stu615⟩. ⟨insu-03618569⟩
9 View
4 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More