472 research outputs found
Episodic accretion in binary protostars emerging from self-gravitating solar mass cores
Observations show a large spread in the luminosities of young protostars,
which are frequently explained in the context of episodic accretion. We here
test this scenario using numerical simulations following the collapse of a
solar mass molecular cloud using the GRADSPH code, varying the strength of the
initial perturbations and the temperature of the cores. A specific emphasis of
this paper is to investigate the role of binaries and multiple systems in the
context of episodic accretion, and to compare their evolution to the evolution
in isolated fragments. Our models form a variety of low mass protostellar
objects including single, binary and triple systems with binaries more active
in exhibiting episodic accretion than isolated protostars. We also find a
general decreasing trend for the average mass accretion rate over time,
suggesting that the majority of the protostellar mass is accreted within the
first 10^5 years. This result can potentially help to explain the surprisingly
low average luminosities in the majority of the protostellar population.Comment: 16 pages, 13 figures, 4 tables. Accepted for publication with A&
Food web structure of fouling communities along the ecological zonation of artificial hard substrates in a North Sea offshore wind farm
onderzoeksrappor
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