Ratio of Earth-Sized exoplanets to other sizes of exoplanet?

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  • #1
Cerenkov
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Hello.

In this issue of the American Scientist magazine,
https://www.americanscientist.org/magazine/issues/2018/september-october, there's an article by Dominik Kraus of the Helmholtz-Zentrum Dresden-Rossendorf Institute of Radiation Physics about the internal composition of the planets Uranus and Neptune. In the opening paragraphs he writes...

The number of planets similar in size to Uranus and Neptune that have been found in the galaxy is roughly nine times greater than the number of much larger planets similar in size to Jupiter and Saturn.


This statistic interests me and I was wondering if other members of PF could help me explore further.
Are there any papers or articles that give other ratios? That is, the ratios of Jovians, Ice-Giants, Super-Earths and Earth-sized exoplanets to each other? Any help given would be appreciated, though I should point out that I'm coming at this from a basic level.

Thank you,

Cerenkov.
 

Answers and Replies

  • #2
trurle
508
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Such statistic is in general very unreliable - because of observational bias. Larger planets are simply much easier to find. The Kepler survey has delivered less biased dataset for Neptune-sized planet and larger though, and i think reference you cited is referring specifically to Kepler data.

You can also see
https://en.wikipedia.org/wiki/Initial_mass_function
which shows opinions wildly different even to the jupiter-brown dwarf range.
 
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  • #3
Cerenkov
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Thanks trurle.

Well, I suppose if I'm to pursue my interest further I'll just have to contact Dominik Kraus directly and ask him where he derived his ratio from.

Cerenkov.
 
  • #4
stefan r
Science Advisor
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305
...Larger planets are simply much easier to find. ...

That would suggest that the number neptunes is higher than the 10:1 ratio reported.

...

This statistic interests me and I was wondering if other members of PF could help me explore further.
Are there any papers or articles that give other ratios? That is, the ratios of Jovians, Ice-Giants, Super-Earths and Earth-sized exoplanets to each other? Any help given would be appreciated, though I should point out that I'm coming at this from a basic level.
....

This website as the full list. You can sort by characteristic like mass or radius. I think wikipedia is more fun to read. You can surf directly to articles.

Planets do not cooperate and fall into neat categories. For example kepler 138b has gas planet densities but Earth like mass.
 
  • #5
Cerenkov
205
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Many thanks, Stefan!

I can now work with these data and discover the ratios for myself.

Cerenkov.
 
  • #8
Cerenkov
205
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Hey TEFling!

Not 5 minutes ago I ordered Yaqoob's book on Amazon.

It'll arrive, not just in time for Xmas, but more importantly, in time for me to better understand the TESS data release scheduled for January.

https://www.nasa.gov/ames/tess-pipeline

And that result is all down to you.

upload_2018-12-1_20-8-44.png
 

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