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"Tau Ceti" sim (Read 3579 times)
EDG
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"Tau Ceti" sim
02/11/07 at 01:01:15
 
Started another system after a bit of a break... (I called this one Tau Ceti because my system generator create it for a G8 V star, and figured Tau Ceti (a G8 V) was as good a place as any for it). The two innermost worlds are actually jovians, the three outer ones are rockies - apparently you can have jovians migrate and still have terrestrials form beyond them afterwards, so this shouldn't be too unrealistic! The second terrestrial is habitable.  
 
Code:
   Num Star	Age    ZMass   Mass	  ZLum	     Lum	   Rad   Met Pha
    53 G8 V     9.239   0.876   0.876     0.3932416     0.6208220     0.884   2   1
  
ZAMShabzone=	0.627
habzone=	    0.788
ZAMSsnowline=     1.590
 
 
Num    AU	 ecc	    type     mass	 den	 rad	  peri	     aph	hill     inner     outer	4:1	 2:1	migrate
 1     0.159     0.016     2.000     0.513	564.4  74426.0     0.156     0.161     0.009     0.120     0.188     0.063     0.100     0.059
 2     0.318     0.057     2.000     0.443     1009.4  58392.5     0.299     0.336     0.017     0.213     0.388     0.126     0.200     0.059
 3     0.600     0.035     4.000     0.000     0.000     0.000     0.579     0.621     0.002     0.571     0.627     0.238     0.378     0.059
 4     0.840     0.065     4.000     0.000     0.000     0.000     0.785     0.895     0.003     0.771     0.903     0.333     0.529     0.059
 5     1.428     0.081     4.000     0.000     0.000     0.000     1.312     1.544     0.005     1.289     1.558     0.567     0.900     0.059
 

 
 
1: Period = 24.74 days. 76 mean anomaly, 74426 km radius, 564.4 density, 0.513 jupiter mass, tidelocked
2: Period = 69.98 days. 50 mean anomaly, 58392.5 km radius, 1009.4 density, 0.443 jupiter mass, 15.076hr rotation
3: Period = 181.37 days. 218 mean anomaly, 2011 km radius, 3800 density, 0.022 earth mass, 38.086 hr rotation
4: Period = 300.43 days. 162 mean anomaly, 7160 km rad, 5100 den, 1.313 earth mass, 19.489hr rot.
5: Period = 665.92 days. 21 mean anomaly, 4600 km rad, 3200 den, 0.218 mass, 26.969 hr rot.
 
It's been running for 200,000 years so far at a timestep of 4096, so far all the bodies are still present and correct. Planet 4 (the habitable one) has a pretty regular eccentricity cycle though, ranging from about 0.065 to 0.115 over 20,000 years - that might have an interesting effect on its climate. Planet 3 seems surprisingly stable, I thought being small it'd be most likely to be tossed out by now, but it's pretty good. Planet 5's orbit has a big 'envelope' (ie every time I check it, the orbit's moved around a fair bit) but also seems stable so far.
 
I'm planning to run it for 2 million years and see how it goes - if it's all there by the end of that time then I'm assuming it'll be stable for the 9.2 billion year age of the system (probably a bit optimistic, but I'm really not waiting THAT long!). It should be stable though, because the program that generated it should have got rid of any objects that would cause instability already.  
 
The attachment contains the gsim and the output txt file for the first 220,000 years.
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Tony
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Re: "Tau Ceti" sim
Reply #1 - 02/11/07 at 14:05:40
 
Here's 10000 years of your simulation at ts=4096 in an animaged GIF
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EDG
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Re: "Tau Ceti" sim
Reply #2 - 02/11/07 at 18:28:22
 
cool... the habitable planet orbit (the green one) gets a mite close to that of the red orbit doesn't it... doesn't seem to affect it though, I've run it for 1.1 million years now and everything's still there, the cycles are still the same.
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frankuitaalst
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Re: "Tau Ceti" sim
Reply #3 - 02/12/07 at 13:31:58
 
Ran the Tauceti system at a good precision for about 9000 years . Altough there's a lot of dynamic in the system , it seems to be stable in the long term  
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Taucetisystem.jpg
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Re: "Tau Ceti" sim
Reply #4 - 02/12/07 at 15:45:23
 
Quote from frankuitaalst on 02/12/07 at 13:31:58:
Ran the Tauceti system at a good precision for about 9000 years . Altough there's a lot of dynamic in the system , it seems to be stable in the long term

Did you use the Picard beta or the standard one?
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EDG
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Re: "Tau Ceti" sim
Reply #5 - 02/12/07 at 16:50:50
 
Yep, after 2.2 million years everything's still stable. I'd attach the final data file, but the attachment size limit here is a bit too small... but it basically continues cycling the way it shows in the other file.  
 
You can grab it from here instead. I'm going to assume the system is going to be stable over billion years, which is nice because it means my system generator program is doing its job Smiley
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frankuitaalst
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Re: "Tau Ceti" sim
Reply #6 - 02/12/07 at 22:43:25
 
Quote from Tony on 02/12/07 at 15:45:23:
Did you use the Picard beta or the standard one?

 
I used the Picard . Can you send the Picard Beta once more ?
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EDG
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Re: "Tau Ceti" sim
Reply #7 - 02/13/07 at 07:46:14
 
There's a new beta?
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Re: "Tau Ceti" sim
Reply #8 - 02/13/07 at 22:11:46
 
Quote from Mal on 02/13/07 at 07:46:14:
There's a new beta?

It integrates Frank's Picard code with Gravity Simulator.  There's still some stuff to work out to get them to work together.  I'll have a chance in a few days to play with it and hopefully iron out the bugs.
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