Ge/Ay133

In what sort of region did our own solar system form?

In what sort of environment did our own solar system form?

In relative isolation (Taurus, Bok globules,…)?

Or as part of a rich cluster (more likely)?

terrestrial

terrestrial

One important set of clues: Short-lived nuclides in meteorites

Murchison

Thin section (chondrules)

CAIs

Also need to worry about spallation (e.g. 14C):

Not just the minor elements/isotopes: Oxygen

Supernova imprint?Would need ~1%“contamination”.

E.D. Young et al.

The dynamics of small bodies in the outer solar system can also tell us about the early environment in which planets were built.

http://cfa-www.harvard.edu/cfa/ps/lists/OuterPlot.html

The radiation environment can be quite harsh in clusters:

Orion Proplyds

For stars still accreting gas/dust, photoevaporation can dramatically shorten the disk lifetime:

External photoevaporation scenario:

1.5

pc

1000

AU

green = H-alphablue = [OIII]red = [SII]

3 pc

1000

AU

Must therefore consider environment in clusters!