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Can understanding which elements are present in a star, in what abundances help researchers estimate the makeup of the exoplanets that orbit them?

The team determined that Ross 128 has iron levels similar to our Sun. Although they were not able to measure its abundance of silicon, the ratio of iron to magnesium in the star indicates that the core of its planet, Ross 128 b, should be larger than Earth's.
See link.
https://www.sciencedaily.com/releases/2018/07/180710122824.htm

9 day(s) ago

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Kravenhead
Apparently so. That's an interesting approach.
This planet mentioned is only 11 light years away. That's pretty darn close, relatively speaking.
They also think it may have a rocky surface similar to earth.
All that they mentioned sounds like it could possibly support life.

I was a little surprised to hear the percentage of red dwarfs in out galaxy.
I didn't realized there were so many.

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Question Title Can understanding which elements are present in a star, in what abundances help researchers estimate the makeup of the exoplanets that orbit them?
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