Retainment of r-process material in dwarf galaxies

Understand

The synthesis of $r$-process elements is known to involve extremely energetic explosions.

• At the same time, recent observations find significant $r$-process enrichment even in extremely small ultra-faint dwarf (UFD) galaxies.
• This raises the question of retainment of those elements within their hosts.
• We estimate the retainment fraction and find that it is large $\sim 0.9$, unless the $r$-process event is very energetic ($\gtrsim 10^{52}$erg) and / or the host has lost a large fraction of its gas prior to the event.