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 Post subject: Re: TRAPPIST-1
PostPosted: Fri, 24-02-17, 21:34 GMT 
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This is just great: I was able to simulate with celestia.Sci the TRIPLE transit involving planets
f = green
c = red
e = yellow

at the spot-on time: Barycentric Julian Date = 2457367.00 + 0.58, i.e
the center config in the figure from the discovery paper in NATURE

[click on image, by all means]
Attachment:
Fig.1.jpg
Fig.1.jpg [ 126.11 KiB | Viewed 2945 times ]


and here is the result from celestia.Sci

[click on image, by all means]
Attachment:
triple_transit_e-f-c.jpg
triple_transit_e-f-c.jpg [ 69.85 KiB | Viewed 2945 times ]


(note there is a vertical ("telescope") flip involved between the 2 configs!)

And this precision happened ~40 ly away! ;-)

Fridger

PS: and here comes the double transit with planets f and c at the correct time
Barycentric Julian Date = 2457367.00 + 0.56, i.e. the lefthand config in Fig.1 above!

[click on image, by all means]
Attachment:
double_transit_f-c.jpg
double_transit_f-c.jpg [ 66.49 KiB | Viewed 2944 times ]

The planet e (yellow) has moved out of the star's disk to the left, just as in Fig.1!

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 Post subject: Re: TRAPPIST-1
PostPosted: Fri, 24-02-17, 21:45 GMT 
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I agree, this is great!
Thanks for showing it.

Andy


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 Post subject: Re: TRAPPIST-1
PostPosted: Sat, 25-02-17, 12:33 GMT 
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That's a really nice result there, so far I hadn't checked the mutual events myself. Good to see it is possible to match these events despite the transit timing variations of the real system that aren't included in the Keplerian model.


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 Post subject: Re: TRAPPIST-1
PostPosted: Sat, 25-02-17, 22:02 GMT 
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Quote:
Here are the equivalent files converted to 1.6.1 format, hopefully these work as I don't have a copy of 1.6.1 to test with.


I can verify that this works fine in Celestia 1.6.1. :DD

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Last edited by stardust on Sat, 25-02-17, 22:12 GMT, edited 3 times in total.

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 Post subject: Re: TRAPPIST-1
PostPosted: Sat, 25-02-17, 22:08 GMT 
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t00fri;

Celestia 1.6.1 doesn't quite get it. Close, but no cigar!


Attachments:
File comment: Does not quite match your conjunction.
11 Dec 2015.jpg
11 Dec 2015.jpg [ 108.25 KiB | Viewed 2914 times ]

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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 1:32 GMT 
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stardust wrote:
t00fri;

Celestia 1.6.1 doesn't quite get it. Close, but no cigar!


1) 11 dec 2015 2h00 UTC [on break]

2) go to earth

3) [entr] to TRAPPIST-1 Go to !

4) trappist-1 F (T1-F) Click

5) T1-F distance 0.20000 UA

6) zoom more (50 X)

;)


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T1f.png
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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 5:19 GMT 
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symaski62 wrote:
stardust wrote:
t00fri;

Celestia 1.6.1 doesn't quite get it. Close, but no cigar!


1) 11 dec 2015 2h00 UTC [on break]

2) go to earth

3) [entr] to TRAPPIST-1 Go to !

4) trappist-1 F (T1-F) Click

5) T1-F distance 0.20000 UA

6) zoom more (50 X)

;)


Got it! Thanks.


Attachments:
11 Dec 2015a.jpg
11 Dec 2015a.jpg [ 86.81 KiB | Viewed 2904 times ]

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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 8:54 GMT 
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Welcome at CelestialMatters (CM), stardust.

Nice to see that the TRIPLE transit also works for Celestia. If I find some time this afternoon, I'll show you how "transit hunting" is done in celestia.Sci

Fridger

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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 13:24 GMT 
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I found (like in the stardust' screenshot) that luminosity is 0.00000377 x Sun, which doesn't match the supposed ESO .pdf parameter of 0.000524 (±0.000034) x Sun, at least for stellar class M8(x). Does celestia.Sci account for better parameters? Due to the wrong luminosity, I'm unable to get the habitable zones for this system even the star's temperature is raised up to the lowest value of 2600K admitted by works of Kopparapu et. al. on habitable zones around main-sequence stars. Of course accounting for lesser than 2600K could change the coefficents, but seem that star itself can be within the temperature range, so it was just a test from my part.

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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 15:00 GMT 
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t00fri wrote:
Welcome at CelestialMatters (CM), stardust.

Nice to see that the TRIPLE transit also works for Celestia. If I find some time this afternoon, I'll show you how "transit hunting" is done in celestia.Sci

Fridger


Thanks Fridger, for the welcome and I look forward to your "transit hunting" tips.
I will try the two transit one you posted earlier to see how it compares to celestia.Sci later.

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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 15:04 GMT 
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fenerit wrote:
I found (like in the stardust' screenshot) that luminosity is 0.00000377 x Sun, which doesn't match the supposed ESO .pdf parameter of 0.000524 (±0.000034) x Sun, at least for stellar class M8(x). Does celestia.Sci account for better parameters? Due to the wrong luminosity, I'm unable to get the habitable zones for this system even the star's temperature is raised up to the lowest value of 2600K admitted by works of Kopparapu et. al. on habitable zones around main-sequence stars. Of course accounting for lesser than 2600K could change the coefficents, but seem that star itself can be within the temperature range, so it was just a test from my part.


I noticed this as well. It would be really nice if we could get a preview version of celestia.Sci :rool: !

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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 15:13 GMT 
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Well, ok... If:
Code:
"TRAPPIST-1"
{
   RA 346.622013
   Dec -5.041274
   Distance 39.4
   SpectralType "M8"
   Radius 83460

   AppMag 13.4
   Temperature 2601

}


I get 0.000545x Sun and planets e, f, g are inside the "liquid water sustainable" zone. Of course AppMag is not the V-band only.

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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 15:23 GMT 
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Fenerit,

did you take into account the bolometric correction = -4.85 in your considerations?

Fridger

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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 15:38 GMT 
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The luminosity value displayed in Celestia is the visual luminosity and TRAPPIST-1 radiates more in the infrared. It may be worth updating the info panel to make this clearer.


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 Post subject: Re: TRAPPIST-1
PostPosted: Sun, 26-02-17, 15:40 GMT 
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t00fri wrote:
Fenerit,

did you take into account the bolometric correction = -4.85 in your considerations?

Fridger


Yes. But [18.8 + (-4.85)] = 13.95 -> 0.000328 x Sun; still too low. I get planets d, e, f inside the zone, not e, f, g.

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