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Coagulation theory has often been used to model the growth of planets, where primordial bodies formed by streaming instability or other processes accrete pairwise, with runaway growth happening beyond a certain threshold condition. These models assume perfect merging, leading to a hierarchy of growth that has been useful in framing the problem. However, about half of “small giant impacts” between planetesimals are in fact non-accretions. Because accretions dispose of the smaller objects, the advancing hierarchy of mergers leads to strong survivorship bias among the unaccreted, of which the major asteroids are sparse samples in my model. I will end with some implications for the primordial planetesimals themselves, and the source regions of the major asteroids and their diversity, and will address the so-called missing mantle paradox.-----------
Venue: Peisestua (room 304), Svein Rosselands hus (https://www.uio.no/om/finn-fram/omrader/blindern/bl26/)
**All are welcome to join!**
More upcoming seminars:
https://www.mn.uio.no/astro/english/research/news-and-events/events/guest-lectures-seminars/friday-colloquia/2026/
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Event venue
Institute of Theoretical Astrophysics, University of Oslo, Sognsveien 77B, 0855 Oslo, Norge, Oslo, Norway
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