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arXiv:astro-ph/0011326 (astro-ph)
[Submitted on 16 Nov 2000]

Title:Constraints on the Birth Aggregate of the Solar System

Authors:Fred C. Adams (U. Michigan), Gregory Laughlin (NASA Ames)
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Abstract: Using the observed properties of our solar system, in particular the isotopic compositions of meteorites and the regularity of the planetary orbits, we constrain the star formation environment of the Sun within the scenario of (external) radioactive enrichment by a massive star. This calculation yields a probability distribution for the number of stars in the solar birth aggregate. The Sun is most likely to have formed within a stellar group containing $N$ = 2000 $\pm$ 1100 members. The {\it a priori} probability of a star forming in this type of environment is ${\cal P} \approx$ 0.0085, i.e., only about 1 out of 120 solar systems are expected to form under similar conditions. We discuss additional implications of this scenario, including possible effects from the radiation fields provided by the putative cluster environment and dynamical disruption of the Kuiper Belt. The constraints of this paper place tight restrictions on the properties of the solar birth aggregate for the scenario of external enrichment by a massive star; alternately, these tight constraints slightly favor a self-enrichment scenario for the short-lived radioactive species.
Comments: 25 pages, 2 figures, accepted to Icarus
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011326
  (or arXiv:astro-ph/0011326v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011326
Journal reference: Icarus150:151-162,2001
Related DOI: https://doi.org/10.1006/icar.2000.6567

Submission history

From: Fred C. Adams [view email]
[v1] Thu, 16 Nov 2000 21:06:01 UTC (29 KB)
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