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Did the Solar System form in a sequential triggered star formation event?

Parker, RJ and Dale, JE (2016) Did the Solar System form in a sequential triggered star formation event? Monthly Notices of the Royal Astronomical Society, 456 (1). pp. 1066-1072. ISSN 0035-8711

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Abstract

The presence and abundance of the short-lived radioisotopes (SLRs) $^{26}$Al and $^{60}$Fe during the formation of the Solar System is difficult to explain unless the Sun formed in the vicinity of one or more massive star(s) that exploded as supernovae. Two different scenarios have been proposed to explain the delivery of SLRs to the protosolar nebula: (i) direct pollution of the protosolar disc by supernova ejecta and (ii) the formation of the Sun in a sequential star formation event in which supernovae shockwaves trigger further star formation which is enriched in SLRs. The sequentially triggered model has been suggested as being more astrophysically likely than the direct pollution scenario. In this paper we investigate this claim by analysing a combination of $N$-body and SPH simulations of star formation. We find that sequential star formation would result in large age spreads (or even bi-modal age distributions for spatially coincident events) due to the dynamical relaxation of the first star-formation event(s). Secondly, we discuss the probability of triggering spatially and temporally discrete populations of stars and find this to be only possible in very contrived situations. Taken together, these results suggest that the formation of the Solar System in a triggered star formation event is as improbable, if not more so, than the direct pollution of the protosolar disc by a supernova.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record "Did the Solar System form in a sequential triggered star formation event?" is available online at: http://dx.doi.org/10.1093/mnras/stv2765
Uncontrolled Keywords: astro-ph.EP; astro-ph.EP; astro-ph.GA; astro-ph.SR; physics.geo-ph
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 25 Nov 2015 10:20
Last Modified: 23 Mar 2016 11:19
URI: http://researchonline.ljmu.ac.uk/id/eprint/2393

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