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PostPosted: Sun, 12-01-14, 0:48 GMT 
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I'm finishing a new addon for Celestia. My first addon of the year ! :)

PSR J0337+1715 is a newly discovered triple stellar system.
This system is unique (one pulsar and two white dwarfs), and is already considered as one of the best lab on General Relativity, especially for the Strong Equivalence Principle. One of the White dwarfs is of surprisingly low temperature (the system is very old).

I used the data from these sources :
http://arxiv.org/abs/1401.0535
http://arxiv.org/abs/1401.0941v1

There's also a video here :
http://www.astron.nl/~archibald/video.html

Here are three views of the system, surrounded by a remnant nebula (click the pictures for a larger view) :
Attachment:
PSRJ0337+1715_1.jpg
PSRJ0337+1715_1.jpg [ 141.2 KiB | Viewed 3877 times ]

Attachment:
PSR J0337+1715_2.jpg
PSR J0337+1715_2.jpg [ 144.4 KiB | Viewed 3877 times ]

Attachment:
PSR J0337+1715_3.jpg
PSR J0337+1715_3.jpg [ 124.6 KiB | Viewed 3877 times ]

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PostPosted: Sun, 12-01-14, 11:07 GMT 
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Cham,

looking very nice and interesting! The add-on should also work for celestia.Sci...

How do you approach the gravitational 3 body problem in this case? I figure from your images that the reduction into 2 body systems should be not too bad? What are the unknown orbital parameters?

Since it is a milli-second pulsar it's emissions should be in the audible range! So it will fit perfectly into a general forthcoming .Sci project, viewtopic.php?f=9&t=381 of implementing many milli-second pulsars (often located in the cores of globular clusters), featuring 3D positional audio, as offered by the latest Qt 5.x release! So, with a number of spacially separated "singing pulsars", this could lead to quite an amazing 3D "concert"... ;-)

Fridger

PS: Best known 'role model' for impressive 3D positional audio is the gorgeous "Virtual Barber Shop" at YouTube ;-)

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PostPosted: Sun, 12-01-14, 14:36 GMT 
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t00fri wrote:
How do you approach the gravitational 3 body problem in this case? I figure from your images that the reduction into 2 body systems should be not too bad? What are the unknown orbital parameters?


The system is highly hierarchical, and is very stable (its characteristic age is estimated to be 2.5 billions years old !). See the paper I gave above.

Almost all orbital parameters are known (see the video above). I'm having some difficulties in translating orbital orientation to Celestia, though.

Even the past evolution of the system is reproduced (see the second paper above).

PSR J0337+1715 is really an interesting system for Celestia (whatever the version or the "flavor").

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Last edited by Cham on Sun, 12-01-14, 14:43 GMT, edited 1 time in total.

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PostPosted: Sun, 12-01-14, 14:40 GMT 
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Cham wrote:
t00fri wrote:
How do you approach the gravitational 3 body problem in this case? I figure from your images that the reduction into 2 body systems should be not too bad? What are the unknown orbital parameters?


The system is highly hierarchical, and is very stable (its characteristic age is estimated to be 2.5 billions years old !). See the paper I gave above.

Almost all orbital parameters are known (see the video above). I'm having some difficulties in translating orbital orientation to Celestia, though.

Even the past evolution of the system is reproduced (see the second paper above).

PSR J0337+1715 is really an interesting system for Celestia (whatever the version of "flavor").


Thanks, very interesting system, indeed. Will look into the papers, ASAP.

Fridger

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PostPosted: Mon, 13-01-14, 16:28 GMT 
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Strange how usage evolves with time. To test my addon, I had to add the MJD time to my LUA plug-ins :
Attachment:
MJD.jpg
MJD.jpg [ 48.2 KiB | Viewed 3840 times ]

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PostPosted: Mon, 20-01-14, 21:28 GMT 
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The orientation in space have been fixed, thanks to Grant.

Here's the STC file for those interested in this unique system :
Attachment:
PSR J0337+1715.stc.zip [1.71 KiB]
Downloaded 135 times

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