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[Fizinfo] CSFK seminar -- Bidong Zhang -- Date: Jun 13 (Thursday)

From: vidakris AT konkoly.hu
To: seminar AT konkoly.hu
Subject: [Fizinfo] CSFK seminar -- Bidong Zhang -- Date: Jun 13 (Thursday)
Date: Fri, 07 Jun 2024 11:30:00 +0200
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Szemináriumi meghívó / Invitation to a seminar
----------------------------------------------

CSFK CSI SZEMINÁRIUM / KONKOLY OBSERVATORY SEMINAR

Date: Jun 13 (Thursday) 16:00

Bidong Zhang
University of California Los Angeles; USA

Compositions of iron-meteorite parent bodies constrain the structure of the
protoplanetary disk
Abstract: Magmatic iron-meteorite parent bodies are the earliest
planetesimals in the Solar System, and they preserve information about
conditions and planet-forming processes in the solar nebula. We did
fractional-crystallization modeling for iron meteorites from the cores of 11
differentiated asteroids. We conclude that asteroidal cores from the outer
Solar System have smaller sizes, elevated siderophile-element abundances, and
simpler crystallization processes than those from the inner Solar System.
These differences are related to the formation locations of the parent
asteroids because the solar protoplanetary disk varied in redox conditions,
elemental distributions, and dynamics at different heliocentric distances.
Using highly-siderophile-element data from iron meteorites, we reconstructed
the distribution of calcium-aluminum-rich inclusions (CAIs) across the
protoplanetary disk within the first million years of Solar-System history.
CAIs, the first solids to condense in the So
lar System, formed close to the Sun. They were, however, concentrated within
the outer disk and depleted within the inner disk. Future models of the
structure and evolution of the protoplanetary disk should account for this
distribution pattern of CAIs.

The seminar will be held live in the Detre hall with audience, but also
streamed online via Zoom. If you are unable to attend the presentation in
person, you can join us via this link
https://us06web.zoom.us/j/82806911982?pwd=SVZpT0syQ1J6dHBvSkF4N2dXNEQ0dz09
or the meeting ID: 828 0691 1982 and passcode: 206265

Everyone is welcome!

Krisztián Vida, Ramon Brasser
organizers
https://konkoly.hu/k-szeminariumok

[Fizinfo] CSFK seminar -- Bidong Zhang -- Date: Jun 13 (Thursday), vidakris, 06/07/2024