The Surprising State of the Earth after the Moon-Forming Giant Impact - ...
Δημοσιεύτηκε στις 28 Ιαν 2015
In
the giant impact hypothesis, the Moon accretes from a disk around the
proto-Earth. In the canonical model, the impact also sets the
present-day angular momentum (AM). Alternatively, the Moon may form via a
high AM giant impact and the present-day AM was established by a lunar
orbital resonance. I will discuss the unusual state of the Earth after a
high angular momentum impact: a continuous pressure- and
rotationally-supported fluid-to-vapor structure from the mantle to the
disk. The surface of the structure cools radiatively and forms droplets.
The droplets settle to the mid plane beyond the Roche radius and form
moonlets. If mixing between the atmosphere and inner disk is efficient,
then a wide range of high AM giant impacts may produce the isotopic
similarity between the Earth and Moon.
the giant impact hypothesis, the Moon accretes from a disk around the
proto-Earth. In the canonical model, the impact also sets the
present-day angular momentum (AM). Alternatively, the Moon may form via a
high AM giant impact and the present-day AM was established by a lunar
orbital resonance. I will discuss the unusual state of the Earth after a
high angular momentum impact: a continuous pressure- and
rotationally-supported fluid-to-vapor structure from the mantle to the
disk. The surface of the structure cools radiatively and forms droplets.
The droplets settle to the mid plane beyond the Roche radius and form
moonlets. If mixing between the atmosphere and inner disk is efficient,
then a wide range of high AM giant impacts may produce the isotopic
similarity between the Earth and Moon.
Δεν υπάρχουν σχόλια:
Δημοσίευση σχολίου