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 Lazarus on 5th July 2018, 1:52 pm

Planet e has gone down a bit though. Wonder if it's still rocky.
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 5th July 2018, 5:56 pm

Well densities of the planets look now planet b 4.81 ,c -5.23, d-4.23, e 4.80, f- 4.66, g- 4.61 , h- 4.39 g/cm3 so all depends on Fe %, Mg % ,water and other factors, nevertheless some of them can contain up to 3 % of water assuming 32 % Fe (earthlike composition) In this case e and c have very similar composition to Venus and may contain little bit more water than Earth can have some land but almost entirely covered by ocean .Planets b and f have almost identical composition but surely require to have water 1-1.5 %. Planet g has the most water of all but not more than 3%.Planet d after revised mass still requires water but much less maybe even less than 0.1%. Planet h has not more than twice water than Earth so is not completely covered by water. Assuming lower Fe % than 32 for example 20 all planets might be waterless even g
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 18th July 2018, 7:15 am

Not sure if such paper appeared here before,
https://www.researchgate.net/publication/323904896_Spin-orbital_Tidal_Dynamics_and_Tidal_Heating_in_the_TRAPPIST-1_Multiplanet_System?_sg=ZgK6QQg-CDoEX9gdc5I_5IUgQUxB-9E09Ww4Noi7wP6s6N37effeA64KmWTlTrWFX-8mgd2Rgw

I have a question about slope of the planet's axis in case of tidal locking and capture in 1:1 and 3:2 resonance? Would Earth and Mars loose completely their 23.4 and 25,2 % slope or decrease only if being in habitable zone of trappist 1 system? After all it has influence on habitability
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 25th July 2018, 2:46 am

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

Post by tommi59 on 10th August 2018, 4:48 am

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

Post by Lazarus on 14th August 2018, 1:07 pm

Dorn et al. "Interior characterization in multiplanetary systems: TRAPPIST-1"
https://arxiv.org/abs/1808.01803

More models of the TRAPPIST-1 planetary bulk compositions.
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Re: TRAPPIST-1 : Transiting Earth-Sized Planets Around a Nearby Ultracool Dwarf

Post by tommi59 on 14th August 2018, 2:23 pm

In this paper mass measurement are from Grimm not Demory slides from Exoplanets 2 .I am curious when any paper of it is going to appear ?
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