Enabling Star Formation via Spontaneous Molecular Dipole Orientation in Icy Solids

Alexander Rosu-Finsen, Jerome Lasne, Andrew Cassidy, Martin R S McCoustra, David Field

Research output: Contribution to journalArticle

2 Citations (Scopus)
24 Downloads (Pure)

Abstract

It is shown here how new experimental data, for the electrical properties of solid CO, can be used to fill important gaps in our understanding of the evolution of pre-stellar cores. Dust grains with a mantle of CO lead to a reduction in the degree of ionization in these cores by a factor of between 5 and 6. The lifetimes for expulsion of magnetic fields from cores, a process generally necessary for gravitational collapse, are reduced from current estimates of several Myr, by a similar factor. This removes a major inconsistency, since lifetimes now tally with typical ages of pre-stellar cores of a few hundred thousand to one million years, derived from observations. With the reduced timescales, cores also escape disruption by Galactic supernova remnants. Our results provide a natural mechanism for the generation of so-called magnetically supercritical cores, in which the magnetic field alone cannot prevent gravitational collapse. In addition we find a minimum value for the density of pre-stellar cores of ≥1.1±0.1×104 H2 cm-3, in agreement with observations.
Original languageEnglish
Article number1
Number of pages6
JournalAstrophysical Journal
Volume832
Issue number1
Early online date10 Nov 2016
DOIs
Publication statusPublished - 20 Nov 2016

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