Element gradients in the Solar neighborhood affecting terrestrial planet composition

Jorge, David (2020) Element gradients in the Solar neighborhood affecting terrestrial planet composition. Bachelor's Thesis, Astronomy.

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Abstract

In the following research we investigate the influence of the equilibrium condensation sequence for various element mixtures using the computer code GGchem. We model a pressure-temperature radial disk profile and use the Hypatia catalog as database for the stellar abundances. We are studying the impact on planet composition when the ratios Fe/Mg, Mg/Si and Fe/S are changed from the Solar abundance values. The study is done using six different stars and the Sun as reference. We discover that using elements ratios typical of the spread shown in main sequence G-type stars in the Solar neighborhood leads in large changes in the type of condensates formed using GGchem. Moreover, the condensed phase from which the planets form does not reflect the initial elements ratios present in the gas phase. Ratios of refractory elements such as Mg/Si translate directly from the gas phase to the condensed phase if the planet form below T< 1000 K. However, ratios with respect to volatile elements such as oxygen change from one phase to the other. Our study show that to accuratly investigate the composition of planets, one needs to take into account the abundances of the stellar system under investigation, and study the condensation of the protoplanetary disk as the resulting condensed phase will have different abundance ratios.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Kamp, I.E.E.
Degree programme:	Astronomy
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	29 Jul 2020 15:05
Last Modified:	06 Aug 2020 10:29
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/22601

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