366 citations · 7.1k across the 125 of their papers we have counts for
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Simulating star formation in molecular cloud cores IV. The role of turbulence and thermodynamics
R. E. Attwood, S. P. Goodwin, D. Stamatellos +1
We perform SPH simulations of the collapse and fragmentation of low-mass cores having different initial levels of turbulence (alpha_turb=0.05,0.10,0.25). We use a new treatment of…
The properties of brown dwarfs and low-mass hydrogen-burning stars formed by disc fragmentation
Dimitris Stamatellos, Anthony P. Whitworth
We suggest that a high proportion of brown dwarfs are formed by gravitational fragmentation of massive extended discs around Sun-like stars. Such discs should arise frequently, but…
The formation of brown dwarfs and low-mass stars by disc fragmentation
Dimitris Stamatellos, Anthony P. Whitworth
We suggest that a high proportion of brown dwarfs are formed by gravitational fragmentation of massive, extended discs around Sun-like stars. We argue that such discs should arise…
Introducing a Hybrid Method of Radiative Transfer in Smoothed Particle Hydrodynamics
Duncan Forgan, Ken Rice, Dimitris Stamatellos +1
We present a new method of incorporating radiative transfer into Smoothed Particle Hydrodynamics (SPH). There have been many recent attempts at radiative transfer in SPH (Stamatell…
SPH simulations of star/planet formation triggered by cloud-cloud collisions
Spyridon Kitsionas, Anthony P. Whitworth, Ralf S. Klessen
We present results of hydrodynamic simulations of star formation triggered by cloud-cloud collisions. During the early stages of star formation, low-mass objects form by gravitatio…
Can giant planets form by gravitational fragmentation of discs?
Dimitris Stamatellos, Anthony P. Whitworth
Gravitational fragmentation has been proposed as a mechanism for the formation of giant planets in close orbits around solar-type stars. However, it is debatable whether this mecha…
Brown dwarf formation by gravitational fragmentation of massive, extended protostellar discs
Dimitris Stamatellos, David Hubber, Anthony Whitworth
We suggest that low-mass hydrogen-burning stars like the Sun should sometimes form with massive extended discs; and we show, by means of radiation hydrodynamic simulations, that th…
The James Clerk Maxwell Telescope Legacy Survey of Nearby Star-forming Regions in the Gould Belt
D. Ward-Thompson, J. Di Francesco, J. Hatchell +59
This paper describes a James Clerk Maxwell Telescope (JCMT) legacy survey that has been awarded roughly 500 hrs of observing time to be carried out from 2007 to 2009. In this surve…
The dust temperatures of the prestellar cores in the rho Oph main cloud and in other star forming regions: consequences for the core mass function
D. Stamatellos, A. P. Whitworth, D. Ward-Thompson
We estimate the dust temperatures of the clumps in the rho Oph main cloud taking into account the 3D geometry of the region, and external heating from the interstellar radiation fi…
Radiative transfer and the energy equation in SPH simulations of star formation
D. Stamatellos, A. P. Whitworth, T. Bisbas +1
We introduce and test a new and highly efficient method for treating the thermal and radiative effects influencing the energy equation in SPH simulations of star formation. The met…
Brown dwarf formation by binary disruption
Simon P. Goodwin, Ant Whitworth
Context: The principal mechanism by which brown dwarfs form, and its relation to the formation of higher-mass (i.e. hydrogen-burning) stars, is poorly understood. Aims: We advocate…
A VLA search for young protostars embedded in dense cores
D. Stamatellos, D. Ward-Thompson, A. P. Whitworth +1
Four dense cores, L1582A, L1689A, B133 and B68, classified as prestellar in terms of the absence of detectable NIR emission, are observed at radio wavelengths to investigate whethe…
SCUBA observations of the Horsehead Nebula - what did the horse swallow?
D. Ward-Thompson, D. Nutter, S. Bontemps +2
We present observations taken with SCUBA on the JCMT of the Horsehead Nebula in Orion (B33), at wavelengths of 450 and 850 \mum. We see bright emission from that part of the cloud…
A dynamical model for the dusty ring in the Coalsack
P. Hennebelle, A. P. Whitworth, S. P. Goodwin
Lada et al. recently presented a detailed near-infrared extinction map of Globule G2 in the Coalsack molecular cloud complex, showing that this starless core has a well-defined cen…
How to identify the youngest protostars
D. Stamatellos, A. P. Whitworth, D. F. A. Boyd +1
We study the transition from a prestellar core to a Class 0 protostar, using SPH to simulate the dynamical evolution, and a Monte Carlo radiative transfer code to generate the SED…
Radiative equilibrium in Monte Carlo radiative transfer using frequency distribution adjustment
Maarten Baes, Dimitris Stamatellos, Jonathan I. Davies +5
The Monte Carlo method is a powerful tool for performing radiative equilibrium calculations, even in complex geometries. The main drawback of the standard Monte Carlo radiative equ…
Binary star formation from ring fragmentation
D. A. Hubber, A. P. Whitworth
We present a simple model of binary star formation based on the assumption that rotating prestellar cores collapse to form rings and these rings then fragment into protostars. We a…
The Minimum Mass for Opacity-Limited Fragmentation in Turbulent Cloud Cores
D. F. A. Boyd, A. P. Whitworth
We present a new analysis of the minimum mass for star formation, based on opacity-limited fragmentation. Our analysis differs from the standard one, which considers hierarchical f…
The Formation of Free-Floating Brown Dwarves and Planetary-Mass Objects by Photo-Erosion of Prestellar Cores
A. P. Whitworth, H. Zinnecker
We explore the possibility that, in the vicinity of an OB star, a prestellar core which would otherwise have formed an intermediate or low-mass star may form a free-floating brown…
The statistical Analysis of Star Clusters
Annabel Cartwright, Anthony P Whitworth
We review a range of stastistical methods for analyzing the structures of star clusters, and derive a new measure which both quantifies, and distinguishes between, a (re…
An explanation for the unusual IMF in Taurus
Simon P. Goodwin, A. P. Whitworth, Derek Ward-Thompson
In comparison with other well studied star formation regions, Taurus is unusual in several respects. (i) Its stellar initial mass function (IMF) peaks at relatively high mass ($\si…
Protostellar collapse induced by compression. II: rotation and fragmentation
P. Hennebelle, A. Whitworth, S. Cha +1
We investigate numerically and semi-analytically the collapse of low-mass, rotating prestellar cores. Initially, the cores are in approximate equilibrium with low rotation (the ini…
Simulating star formation in molecular cloud cores I. The influence of low levels of turbulence on fragmentation and multiplicity
Simon P Goodwin, A P Whitworth, D. Ward-Thompson
We present the results of an ensemble of simulations of the collapse and fragmentation of dense star-forming cores. We show that even with very low levels of turbulence the outcome…
Triggered massive-star formation at the border of the HII region Sh 104
L. Deharveng, B. Lefloch, A. Zavagno +4
We present millimetre-line imaging of the Galactic HII region Sh 104. We show that it is surrounded by a ring of molecular gas and dust. Four large molecular condensations are regu…