[Space] Hot Jupiters

Agemegos · 01-19-2007, 12:48 AM

Marcy et al [2005] is a paper reviewing the extrasolar planets discovered to date.

According to the abstract, the incidence of 'hot Jupiters' among F, G, and K stars is 1.2% ± 0.2%. Using the Star System Generation procedure in GURPS Space you get such an 'Epistellar gas giant' on a roll of 15–18 on 3d6. Which is 9.3% of all systems.

balzacq · 01-19-2007, 01:44 AM

Currently the breakdown is:

No Gas Giant (3-10): 50.0%
Conventional (11-12): 24.1%
Eccentric (13-14): 16.6%
Epistellar (15-18): 9.3%

We could easily adjust the chart:

No Gas Giant (3-10): 50.0%
Conventional (11-13): 33.8%
Eccentric (14-16): 14.3%
Epistellar (17-18): 1.9%

Thus we get closer to the reported percentage for hot Jupiters while slightly increasing the number of systems with conventional gas giants, which suits my preferences nicely.

Unfortunately, the abstract suggests that only 12% of systems have gas giants at all, and most orbits are eccentric, which suggests a chart like this:

No Gas Giant (3-13): 83.8%
Conventional (14): 6.9%
Eccentric (15-16): 7.4%
Epistellar (17-18): 1.9%

Whaddaya think?

Pomphis · 01-19-2007, 04:45 AM

Quote:

Originally Posted by Agemegos

That, and the fact that the state of the art is changing so fast that anything I commit myself to is likely to be bunk well within the life of my setting designs.

Will players really visit so many systems that they will notice statistically incorrect numbers ?

01-19-2007, 12:48 AM	#1
Agemegos Join Date: May 2005 Location: Oz	[Space] Hot Jupiters Marcy et al [2005] is a paper reviewing the extrasolar planets discovered to date. According to the abstract, the incidence of 'hot Jupiters' among F, G, and K stars is 1.2% ± 0.2%. Using the Star System Generation procedure in GURPS Space you get such an 'Epistellar gas giant' on a roll of 15–18 on 3d6. Which is 9.3% of all systems. __________________ Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 10-30-2010 at 08:47 PM.

01-19-2007, 01:44 AM	#2
balzacq Join Date: Nov 2005 Location: Seattle, Washington	Re: [Space] Hot Jupiters Currently the breakdown is: No Gas Giant (3-10): 50.0% Conventional (11-12): 24.1% Eccentric (13-14): 16.6% Epistellar (15-18): 9.3% We could easily adjust the chart: No Gas Giant (3-10): 50.0% Conventional (11-13): 33.8% Eccentric (14-16): 14.3% Epistellar (17-18): 1.9% Thus we get closer to the reported percentage for hot Jupiters while slightly increasing the number of systems with conventional gas giants, which suits my preferences nicely. Unfortunately, the abstract suggests that only 12% of systems have gas giants at all, and most orbits are eccentric, which suggests a chart like this: No Gas Giant (3-13): 83.8% Conventional (14): 6.9% Eccentric (15-16): 7.4% Epistellar (17-18): 1.9% Whaddaya think? __________________ -- Bryan Lovely My idea of US foreign policy is three-fold: If you have nice stuff, we’d like to buy it. If you have money, we’d like to sell you our stuff. If you mess with us, we kill you.

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