Worldbuilding help - oxygen-to-hydrogen ratio, planet migration, etc

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Worldbuilding help - oxygen-to-hydrogen ratio, planet migration, etc

Post by Baltazar on 19th December 2011, 10:37 pm

Hello to all Smile

I was designing a star system, that features an inhabited planet, as part of a personal "fictional universe" project.

I was looking for a random sun-like star as the home of the planet, and the point of origin of the life forms the planet featured. I had picked it up some time ago when the biosphere was just a concept of a few sentences inside my head. As I have added a lot more details and complexity to it, i was thinking of researching the star system, to see how plausible is it to host a planet like the one I imagined.

The star system in question is HD 45184 (referred to as Corum in my fictional universe). What I was initially looking for was:

* Possibility of hosting rocky bodies;

* Corum being slightly larger than the Sun, and shining more brightly since the planet (called Arcadius) is receiving a bit more heat and light than the Earth does;

* Arcadius having violent megaquakes and meteor showers creating an extinction level event at some point in its history, as a result of external factors;

* Arcadius has large oceans as well as oxygen and ozone-producing life forms.


Information about the star was poor (to say the least), until recently, when more information and data was released about it together with the discovery of a large planetary body, almost the size of Neptune, orbiting in a very close orbit around the star (0.0638 AU), earning it hot Super-earth candidate status.


The star is similar to the Sun (G1.5V), a bit larger mass and radius, slightly more luminous, temp. slightly higher than Earth (5869 K), and metallicity higher than the Sun, ranging from 110% to 140%, and its age is 4.1 billion years.

Most of the data above seem to fit with the characteristics I have prescribed to the system without even knowing anything about it other than its spectral class (at the time thought to be G2V). I guess I was lucky.



Now, I have a few questions, and would very much appreciate the answers:

1) Does anyone know more about planet migration? Especially migration of giant planets? I was thinking of using the giant planet that's discovered as the reason behind the megaquakes and meteor showers that gradually cause an extinction level event on the planet in its distant past. Is a body the size of Neptune large enough to cause such effects on smaller worlds such as Arcadius, like the quakes and also large enough to hurl comets and asteroids towards the planet? Without having to be too close for the two planets to crash into each other?

2) This star system has an unusually high abundance of yttrium and barium compared to our Sun (barium reaching 44% more than the barium presence in our solar system) - Would this mean that I could incorporate it somehow in some quantity in the biosphere or the atmosphere? Is there any organic molecules that can chain yttrium and especially barium? I'm just curious as to the possibility, I can surely go without them.

3) It said the oxygen-to-hydrogen ratio is 23% higher than the oxygen-to-hydrogen ratio in the sun. What does that exactly mean? Sorry if its a stupid question, but I'm not sure what to take from it. Does this mean hydrogen and oxygen are 23% more present in the chemical soup the star is made of, than the sun? Would that mean 23% more water? It would surely fit with Arcadius having more water, and life forms that produce a lot of oxygen.



I appreciate any well-intentioned input. Thank you Smile
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Re: Worldbuilding help - oxygen-to-hydrogen ratio, planet migration, etc

Post by Baltazar on 18th February 2012, 4:44 pm

No help?


..... really?


If I can't get help here, where would I then?
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Re: Worldbuilding help - oxygen-to-hydrogen ratio, planet migration, etc

Post by Sirius_Alpha on 18th February 2012, 5:03 pm

As to your first question, planetary migration is still a subject of ongoing research. You can always find some free-to-access literature on the subject at arXiv (like here).

Your second question, I don't know enough about organic chemistry.

Your third, yes, there's 23% more oxygen for every unit amount of hydrogen for that star than there is for the sun. As to whether it means 23% more water, I doubt it's that simple, as there's other oxygen-involving compounds present.

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Re: Worldbuilding help - oxygen-to-hydrogen ratio, planet migration, etc

Post by Baltazar on 18th February 2012, 5:15 pm

Sirius_Alpha wrote:As to your first question, planetary migration is still a subject of ongoing research. You can always find some free-to-access literature on the subject at arXiv (like here).

Your second question, I don't know enough about organic chemistry.

Your third, yes, there's 23% more oxygen for every unit amount of hydrogen for that star than there is for the sun. As to whether it means 23% more water, I doubt it's that simple, as there's other oxygen-involving compounds present.

Finally! A response! YAY!

Seriously though, thanks for the comment. I don't know why I haven't checked arXiv. I have seen planet migration discussed on some forums by people who seem to know what they talk about but i haven't been a member there and the things discussed were planet migration from a different aspect (not the one I needed). I posted this question on another science forum and got zero responses as well, which was kind of frustrating (if its science-oriented forum you'd expect some responses right?)

Only the first and the third questions were of most importance to me, so thanks for at least giving me an answer for the third one. Much appreciated.
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