TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Sirius_Alpha on 24th February 2017, 5:31 pm

Huh! I had no idea you could get spin-orbit resonances with such low eccentricities!

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Lazarus on 28th February 2017, 7:29 pm

Thanks for posting that paper, that'll come in pretty useful for worldbuilding-type stuff.
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Lazarus on 2nd March 2017, 7:19 pm

Playing around with the formulae in here and the maximum triaxiality formulae there, if I set the eccentricities to the maximum values I get probabilities of up to ~8% for capture into the 3:2 resonance for some of the TRAPPIST-1 planets using the bare rock triaxiality. However these eccentricities are likely quite a lot higher than the true system, which results in decreasing probability of resonance capture.
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Led_Zep on 5th March 2017, 7:10 pm

http://archive.stsci.edu/archive_news/2017/03-Mar/index.html#article1

Raw observational data from K2 Campaign 12, featuring the TRAPPIST-1 exoplanet system, will be available for download from MAST on Tuesday, March 7th
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Lazarus on 9th March 2017, 6:10 pm

K2 data released.

NASA press release
Data on MAST
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 9th March 2017, 6:57 pm

Possibly 9 planets around Trappist 1 ? It would be very interesting indeed

EPIC 200164267, P=1.5108 days, starting at BKJD 2906.52, duration 1.5 hours, depth 0.0078 (planet b) 
EPIC 200164267, P=2.4218 days, starting at BKJD 2907.53, duration 1.5 hours, depth 0.0055 (planet c) 
EPIC 200164267, P=4.0496 days, starting at BKJD 2905.98, duration 1.5 hours, depth 0.0054 (planet d) 
EPIC 200164267, P=6.0996 days, starting at BKJD 2906.66, duration 2.5 hours, depth 0.0034 (planet e) 
EPIC 200164267, P=9.2066 days, starting at BKJD 2912.02, duration 2.5 hours, depth 0.0081 (planet f) 
EPIC 200164267, P=12.352 days, starting at BKJD 2906.49, duration 2.5 hours, depth 0.0070 (planet g) 
EPIC 200164267, P=16.550 days, starting at BKJD 2906.83, duration 3,5 hours, depth 0.0072 (planet X) 
EPIC 200164267, P=19.974 days, starting at BKJD 2923.70, duration 3.5 hours, depth 0.0076 (planet h) 
EPIC 200164267, P=26.740 days, starting at BKJD 2923.19, duration 1.5 hours, depth 0.0099 (planet Y), Very Happy
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Sirius_Alpha on 10th March 2017, 1:04 am

What is the source for that?

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Lazarus on 10th March 2017, 4:16 am

It's in one of the comments on the MAST page. If that ends up being confirmed, nine planets would make it the highest number of any known planetary system, pretty impressive for such a small star.
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 10th March 2017, 4:56 am

According to our planet hunters talk actually we do not know whether tentative planet h detected by Spitzer has 20 days period it can have two different periods maybe even single transit of more distant planet
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Sirius_Alpha on 10th March 2017, 5:22 am

I'm a bit confused as to why the "X" planet would not have shown up in the Spitzer LC, unless it transited simultaneously with the "h" planet?

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 10th March 2017, 5:54 pm

Maybe x transited during glitch or gaps when spitzer transmitted data
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 11th March 2017, 4:58 pm

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 11th March 2017, 4:59 pm

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 11th March 2017, 5:00 pm


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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Led_Zep on 11th March 2017, 7:09 pm

??
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Sirius_Alpha on 11th March 2017, 7:39 pm

Led_Zep wrote:??
Light curves for the b, c, d and e planets.

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 12th March 2017, 4:37 am

Bit different values for radii for b,c,d than in nature paper equalizing densities b and c. I wonder is better to have 4 times more data from k2 or from spitzer?
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 12th March 2017, 4:07 pm

Tentative planet h has different period than 20 days  as I guessed. Indeed it is 32.6 days. One of our planet hunter volunteer found 2 additional transits of planet h in K2 data.
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Sirius_Alpha on 12th March 2017, 11:19 pm

"Appearing in 24 hours on arXiv! A first look at #TRAPPIST1h resulting from a heroic 65 hour effort led by @rodluger! Excited to share more!"
https://twitter.com/ethan_kruse/status/841092095448305665


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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 13th March 2017, 3:59 am

Shot of planet h ?



Last edited by tommi59 on 12th April 2017, 3:09 am; edited 1 time in total
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Sirius_Alpha on 13th March 2017, 9:54 pm

A terrestrial-sized exoplanet at the snow line of TRAPPIST-1
https://arxiv.org/abs/1703.04166

The TRAPPIST-1 system is the first transiting planet system found orbiting an ultra-cool dwarf star. At least seven planets similar to Earth in radius and in mass were previously found to transit this host star. Subsequently, TRAPPIST-1 was observed as part of the K2 mission and, with these new data, we report the measurement of an 18.764 d orbital period for the outermost planet, TRAPPIST-1h, which was unconstrained until now. This value matches our theoretical expectations based on Laplace relations and places TRAPPIST-1h as the seventh member of a complex chain, with three-body resonances linking every member. We find that TRAPPIST-1h has a radius of 0.715 Earth radii and an equilibrium temperature of 169 K, placing it at the snow line. We have also measured the rotational period of the star at 3.3 d and detected a number of flares consistent with an active, middle-aged, late M dwarf.

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Led_Zep on 13th March 2017, 11:18 pm

The star : an age in the range 3-8 Gyr ! (0.5 previously)
Near the end of the K2 campaign, a very energetic flare erupted
no detected additional planets in the system
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 14th March 2017, 4:48 am

It seems that one transit of planet_h is hidden in a flare, and one is inside a transit of planet_b I m not really convinced
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by PlutonianEmpire on 15th March 2017, 6:42 pm

Led_Zep wrote:The star : an age in the range 3-8 Gyr ! (0.5 previously)
Near the end of the K2 campaign, a very energetic flare erupted
no detected additional planets in the system
There goes that system's habitability. Razz

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by Rajasun on 15th March 2017, 8:28 pm

PlutonianEmpire wrote:There goes that system's habitability. Razz

Isn't that a little too premature an announcement to make in that we know nothing yet about the atmospheres and gravities of any of the planets in the system? Besides, even accounting for possible thin atmospheres and weak gravities on all of the planets, we know zilch about any ocean/s on any of the worlds in the system, no?

Also am I correct to say that as we know not if any of the planets in the TRAPPIST-1 have ocean/s, we cannot yet rule out the possibility of life having survived perhaps even prospered due to the protection offered by the oceanic cover, yes? No?

Same applies to possible subterranean life also, no Rolling Eyes ?

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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

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