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Forum » SpaceEngine » Science and Astronomy Discussions » Exoplanet News Thread (Post here any discoveries related to extrasolar planets)
Exoplanet News Thread
HarbingerDawnDate: Thursday, 08.11.2012, 09:20 | Message # 61
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Quote (smjjames)
I don't know how strong a magnetic field from a gas giant (or gas/ice dwarf as this planet might be classified) has to be to protect a moon from losing it's atmosphere, but it could happen.

No. Atmosphere is not just lost through sputtering (being stripped by solar wind). It is also lost just due to the momentum of molecules in the upper atmosphere being great enough to overcome the gravity of the planet, and so they fly off into space. For this reason, the warmer a world is, the larger it has to be to retain an atmosphere. For example, Earth's moon is too small and too warm to retain an atmosphere if I'm not mistaken.





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DoctorOfSpaceDate: Thursday, 08.11.2012, 13:32 | Message # 62
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Thanks to some help from HarbingerDawn on HD 40307 E, which he did in this file, I did F and G.




Just add this to data\catalogs\planets\Exoplanets.sc
Quote
Planet "HD 40307 e"
{
ParentBody "HD 40307"
Mass 3.5
Orbit
{
Period 0.0947843942505133470226
SemiMajorAxis 0.1886
Eccentricity 0.15
ArgOfPericen 302
}
}

Planet "HD 40307 f"
{
ParentBody "HD 40307"
Mass 5.2152
Orbit
{
Period 0.1417111567419576
SemiMajorAxis 0.247
Eccentricity 0.02
ArgOfPericen 91.2
}
}

Planet "HD 40307 g"
{
ParentBody "HD 40307"
Mass 7.0914
Orbit
{
Period 0.5415468856947296
SemiMajorAxis 0.6
Eccentricity 0.29
ArgOfPericen 354
}
}





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Edited by DoctorOfSpace - Thursday, 08.11.2012, 13:35
 
SpaceEngineerDate: Thursday, 08.11.2012, 13:47 | Message # 63
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Quote (smjjames)
For the moon: Havning a moon with a thick atmosphere isn't outside the realm of possibility. I don't know how strong a magnetic field from a gas giant (or gas/ice dwarf as this planet might be classified) has to be to protect a moon from losing it's atmosphere, but it could happen.

On the contrary, a magnetic field of gas giant may help a moon to lose its atmosphere. Particles of solar wind may be captured and accelerated by the gas giant's magnetosphere to speeds even higher than they have in a solar wind. And, as Harb said, the solar wind is not the main cause of atmosphere dissipation. The main cause is thermal dissipation - molecules that move fast enough to reach escape velocity will escape from the atmosphere.

Quote (smjjames)
Also, despite being smaller than mars, if such a moon is at the right distance, it should get enough tidal stretching to keep its core from cooling too much and therefore, keep a magnetic field.

Moons are usually tidal-locked to their parent planets, so their axial rotation period is equal to the orbital period and is about a month. So a moon's magnetic field may be weak enough, to slow rotation of the core.

*





 
SalvoDate: Thursday, 08.11.2012, 19:41 | Message # 64
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I have just heard about HD 40307 system and you already made the addon, this program is awesome cry
I hope SpaceEngineer will make cockpit and fix spaceship's bug soon, i don't know if could be possible in next update but maybe the one after yes smile





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smjjamesDate: Saturday, 10.11.2012, 22:16 | Message # 65
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Interesting little article: http://www.space.com/18404-alien-planet-colors-habitability.html

Project to give names to exoplanets: http://www.space.com/18420-exoplanet-name-baby-book-uwingu.html

There are already a few named like Osiris and Bellerophon. Anyways, I hope they use names from every human language, down to the endangered ones and possibly some dead languages.

[Discussion on naming/cataloging astronomical objects split to here]





 
DisasterpieceDate: Sunday, 11.11.2012, 06:29 | Message # 66
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On the diamond planet topic, if anyone here knows what a hybrid spud gun is they shouldn't let me within a parsec of this planet. If they do 10000x hybrid here I come!




I play teh spase engien
 
HarbingerDawnDate: Wednesday, 14.11.2012, 20:43 | Message # 67
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A rogue planet has been discovered 100 light years from Sol, the closest one yet discovered. It is thought to be around 4-7 Jupiter masses and perhaps 700 K in average temperature, due to its probable young age of 50-120 million years.

Artist's (very artistic) impression



ESO release: http://www.eso.org/public/news/eso1245/

Space.com article: http://www.space.com/18461-rogue-alien-planet-discovery.html





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DoctorOfSpaceDate: Wednesday, 14.11.2012, 20:44 | Message # 68
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Quote (HarbingerDawn)
A rogue planet has been discovered 100 light years from Sol


I want to say that is awesome but at the same time that is rather alarming. Just makes you wonder what else is out there and what could have our name on it.





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HarbingerDawnDate: Wednesday, 14.11.2012, 21:00 | Message # 69
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Quote (DoctorOfSpace)
Just makes you wonder what else is out there and what could have our name on it.

If you find something out there with your name on it, it was most definitely aliens, for real this time.





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HarbingerDawnDate: Thursday, 15.11.2012, 09:37 | Message # 70
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The Kepler space telescope has completed its prime mission and has now begun an extended mission planned to last four more years. This should greatly improve our chances of discovering Earth-like worlds around Sun-like stars.

NASA release: http://www.nasa.gov/mission....on.html

Space.com article: http://www.space.com/18487-nasa-alien-planet-mission-extension.html





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smjjamesDate: Monday, 10.12.2012, 00:05 | Message # 71
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http://www.space.com/18817-brown-dwarf-earth-size-planets.html

It's not a huge surprise that brown dwarfs can have accretion disks, after all, planets seem to form the first chance they can get.

Now, whether life could exist on a planet around such a brown dwarf is another matter entirely.





 
HarbingerDawnDate: Wednesday, 19.12.2012, 12:50 | Message # 72
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There is evidence for 5 possible planets orbiting Tau Ceti, which is only 12 light years away and thus quite popular among science fiction writers. One of these proposed planets is in the habitable zone. All of the planets are relatively small super-Earths. However there is much doubt about whether the planets really exist and it could be a long time before we know with much confidence what planets really are there, if any.

Space.com article





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OrbitalResonanceDate: Wednesday, 19.12.2012, 19:51 | Message # 73
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Tau Ceti Factsheet

Distance: 11.9 Light-years

Absolute Magnitude: 5.69 vs 4.83 Sol

Apparent Magnitude: 3.50

Spectral Class: G5.8V

Mass: 70% Sol

Radius: 79% Sol

Luminosity: 52% Sol

Habitable Zone: Inner 0.52AU toCenter 0.74 AU to Outer 1.15 AU

Temperature: 5,344 K vs 5,778 Sol

Rotation: 34 Days VS 25 Sol

Radial Velocity: -17 km/s, approaching earth

Galactic Eccentricity: 50.6% VS 16.0% for Sol

Age: 7 billion years to 10 billion years VS Sol’s 4.5 Gy

Projected Lifespan: 15 billion years, 46% to 70% of lifetime used VS 45% for sun

Possibility of 5+ planets in system!!





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DoctorOfSpaceDate: Thursday, 20.12.2012, 15:08 | Message # 74
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Quote (OrbitalResonance)
Possibility of 5+ planets in system!!


Just saw it on PopSci
http://www.popsci.com/technol....-planet
Quote
It was really big news back in October when astronomers discovered an Earth-sized planet whipping around Alpha Centauri B, a star in the Alpha Centauri system, the closest star system to Earth. Now, it turns out the nearest single sun-like star to us is likely also harboring planets--five of them--and one looks to be orbiting in the so-called “goldilocks zone.”

The star is known as Tau Ceti, which resides just 12 light-years away. That’s further than Alpha Centauri (at just four light-years) but the Tau Ceti finding is significant. The Alpha Centauri exoplanet orbits its star at too close a distance to harbor surface water--it’s simply too hot. The potential planet orbiting Tau Ceti, though its precise composition is unknown, looks to be a rocky planet like Earth. And it’s orbital distance is such that liquid water could exist on the planet’s surface.

Its minimum mass is just 4.3 times that of Earth, making it the smallest exoplanet to be discovered in the habitable zone of a sun-like star. And it’s worth noting here that the this planet is not yet confirmed--while it appears to exist in data collected from three different instruments, further study is needed before astronomers can declare it a known exoplanet. But if confirmed, the Tau Ceti planets would be a prime candidates for further study--and perhaps for eventual exploration.


Wouldn't that be cool





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Edited by DoctorOfSpace - Thursday, 20.12.2012, 15:09
 
anonymousgamerDate: Thursday, 20.12.2012, 15:08 | Message # 75
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[Merged from another thread]

http://news.yahoo.com/planet-....RHtDpiF nM3D-pd8XWqnnZlVJNU6A-ttrsd1KcpaITuhky9OFvgC79jfcWzQDHjcNNVc#_=_

Thats a long link, lol





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Forum » SpaceEngine » Science and Astronomy Discussions » Exoplanet News Thread (Post here any discoveries related to extrasolar planets)
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