Date: 30/05/2019 13:05:05
From: Tau.Neutrino
ID: 1393250
Subject: Astronomers find 'forbidden' planet NGTS-4b orbiting a star in the 'Neptunian Desert'

Astronomers find ‘forbidden’ planet NGTS-4b orbiting a star in the ‘Neptunian Desert’

A group of international astronomers say they have observed a “forbidden” planet closely orbiting a star.

more…

Should do a movie about it.

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Date: 30/05/2019 13:08:53
From: Tau.Neutrino
ID: 1393252
Subject: re: Astronomers find 'forbidden' planet NGTS-4b orbiting a star in the 'Neptunian Desert'

I wonder what NGTS-4b’s magnetic field looks like?

Maybe the magnetic field has properties we haven’t seen yet?

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Date: 30/05/2019 15:47:11
From: Tau.Neutrino
ID: 1393315
Subject: re: Astronomers find 'forbidden' planet NGTS-4b orbiting a star in the 'Neptunian Desert'

Maybe the interior of the planet has certain metals in it creating a strong magnetosphere, perhaps stronger than Jupiter?

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Date: 30/05/2019 17:19:30
From: mollwollfumble
ID: 1393331
Subject: re: Astronomers find 'forbidden' planet NGTS-4b orbiting a star in the 'Neptunian Desert'

Tau.Neutrino said:


Maybe the interior of the planet has certain metals in it creating a strong magnetosphere, perhaps stronger than Jupiter?

https://www.sciencedaily.com/releases/2019/05/190528193034.htm

I’ve never thought sub-neptune = super-earth sized planets to be particularly rare.

Now if it was found orbiting at the orbital radius of Neptune, that would be exceedingly rare.

> It orbits around the star in only 1.3 days

Nope.

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Date: 30/05/2019 17:26:33
From: mollwollfumble
ID: 1393336
Subject: re: Astronomers find 'forbidden' planet NGTS-4b orbiting a star in the 'Neptunian Desert'

Tau.Neutrino said:


I wonder what NGTS-4b’s magnetic field looks like?

Maybe the magnetic field has properties we haven’t seen yet?

Magnetic field doesn’t help much in retaining atmosphere. Venus has a much weaker magnetic field than Earth but much thicker atmosphere. Actually, the same is true of Titan.

Thickness of atmosphere has a lot to do with the violence with which planetesimals collide to form the final planet.

Here’s a speculation. I speculate that NGTS-4b doesn’t have a big moon.

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Date: 30/05/2019 17:45:55
From: Cymek
ID: 1393345
Subject: re: Astronomers find 'forbidden' planet NGTS-4b orbiting a star in the 'Neptunian Desert'

mollwollfumble said:


Tau.Neutrino said:

I wonder what NGTS-4b’s magnetic field looks like?

Maybe the magnetic field has properties we haven’t seen yet?

Magnetic field doesn’t help much in retaining atmosphere. Venus has a much weaker magnetic field than Earth but much thicker atmosphere. Actually, the same is true of Titan.

Thickness of atmosphere has a lot to do with the violence with which planetesimals collide to form the final planet.

Here’s a speculation. I speculate that NGTS-4b doesn’t have a big moon.

That close wouldn’t the suns gravity either not allow it to form or rip it away

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Date: 30/05/2019 18:09:46
From: Tau.Neutrino
ID: 1393355
Subject: re: Astronomers find 'forbidden' planet NGTS-4b orbiting a star in the 'Neptunian Desert'

What is the heaviest gas a planet like that could have?

Could a spectrograph of NGTS-4b show it?

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