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Author Topic: Recreating a theoretical star system  (Read 5295 times)

tuckrr

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Recreating a theoretical star system
« on: August 18, 2014, 07:58:06 PM »
Hey guys! 
I'm new to using universe sandbox, but so far I think its great.  I've been trying to recreate a binary star system which was theorized in 2001.  The paper, written by S. Edgeworth, can be found here:
http://www.academia.edu/3029649/Theoretical_Orbits_of_Planets_in_Binary_Star_Systems

I'm specifically trying to achieve page #15/16

I don't know enough about the program yet to make this system myself, but I'm learning quickly.  If someone knows a guru on the forums please let them know about this challenging system.  I'd really appreciate some help with the advanced tools, or getting a stable starting point.
Cheers,
Tuckrr

gabriel.dac

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Re: Recreating a theoretical star system
« Reply #1 on: August 19, 2014, 08:48:27 AM »
(Link of the orbit, for the lazy: http://htmlimg1.scribdassets.com/2lq25ze3pc2eifzu/images/15-7380fd2fe7.jpg)

haha wow. That's something extremely tricky to do! I'm afraid I can't help you on that

tuckrr

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Re: Recreating a theoretical star system
« Reply #2 on: August 19, 2014, 06:51:51 PM »
Also, a bug I've noticed with the software.  Binary star systems don't last very long.
Repro Steps:
1.  Make 2 stars of equal properties
2.  Highlight both
3.  Click "Make Binary Orbit"
4.  Click "Add Barycenter"
5.  Click "Balance selected"
6.  Speed up the time, after a few years the stars will leave each other somehow.

Weird bug, but it will make stable systems tough to achieve...

Unnamed25

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Re: Recreating a theoretical star system
« Reply #3 on: August 22, 2014, 09:32:23 PM »
Also, a bug I've noticed with the software.  Binary star systems don't last very long.
Repro Steps:
1.  Make 2 stars of equal properties
2.  Highlight both
3.  Click "Make Binary Orbit"
4.  Click "Add Barycenter"
5.  Click "Balance selected"
6.  Speed up the time, after a few years the stars will leave each other somehow.

Weird bug, but it will make stable systems tough to achieve...
The faster the simulation goes, the more inaccurate it gets.

tuckrr

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Re: Recreating a theoretical star system
« Reply #4 on: September 09, 2014, 06:38:15 PM »

The faster the simulation goes, the more inaccurate it gets.

Ahh Gotcha.  Is there a recommended speed I should use?

Also, are there templates of Binary systems I can work off of?

sedge

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Re: Recreating a theoretical star system
« Reply #5 on: September 13, 2014, 04:41:13 AM »
Hi, I wrote that article, thanks for reading it.
I don't have universe sandbox so am guessing here:
First set up a binary system of two stars of equal mass with circular orbits around each other.
If the orbits decay, reduce the time step (slow it down).
After getting the two stars orbiting ok, you then need to add a planet of zero(negligible) mass.
To give you an idea of where to position this planet, and what velocity to give it, here are the initial parameters for a similar orbit illustrated on page 17.
https://www.academia.edu/4716055/Initial_parameters_for_a_theoretical_S-type_stable_planetary_orbit_with_period_equal_to_the_binary_star_period
« Last Edit: September 13, 2014, 04:47:04 AM by sedge »

Unnamed25

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Re: Recreating a theoretical star system
« Reply #6 on: September 17, 2014, 04:12:16 PM »

The faster the simulation goes, the more inaccurate it gets.

Ahh Gotcha.  Is there a recommended speed I should use?

Also, are there templates of Binary systems I can work off of?
It depends on computer power.

A more powerful computer can go faster timesteps without starting to get really innacurate