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Stars with planets on strange orbits: what's going on?
phys.org ^ | 05/27/2016

Posted on 05/29/2016 5:12:02 PM PDT by BenLurkin

All the planets in our solar system orbit close to the sun's equatorial plane. Of the eight confirmed planets, the Earth's orbit is the most tilted, but even that tilt is still small, at just seven degrees.

It was natural, then, for astronomers to expect that planets orbiting other stars would behave the same way... But in recent years, new observations have revealed that the story is somewhat more complicated, at least for the oddest planets known, the Hot Jupiters.

...

Comparable in mass to Jupiter, they move on incredibly short period orbits, almost skimming the surfaces of their host star. Instead of Jupiter's sedate 12-year orbit, they whizz around with periods of days, or even hours. Finding planets on such extreme orbits meant a major rethink.

...

Then came another set of shocking discoveries. Rather than moving in the same plane as their host star's equator, some Hot Jupiters turned out to have highly tilted orbits. Some even move on retrograde orbits, in the opposite direction to their star's rotation.

...

The most widely accepted model of planet formation is "core accretion"...

But this simple model fails to explain the latest discoveries of planets on highly inclined orbits. The migration described above typically happens within the disk, keeping the planet close to the star's equatorial plane.

To excite it to a highly inclined orbit requires something more.

To date, astronomers have measured the orbital inclinations of 91 exoplanets and more than a third (36) move on orbits that are significantly misaligned, tilted by more than 20 degrees. Nine of them move on retrograde orbits.

Were there one or two misaligned planets, we could write them off as a fluke of nature. But the number found is far too large to be coincidence.

(Excerpt) Read more at phys.org ...


TOPICS: Astronomy; Science
KEYWORDS: astronomy; capture; catastrophism; coreaccretion; retrogradeorbits; science; xplanets
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To: BenLurkin

Hyper-dimensional physics at work - what James Clerk Maxwell demonstrated in his 200 quaternions, before self-taught mamas-boy Heavyside tossed all but four which he striped of fields ... giving us all we know about electromagnetic spectrum from computers to radio to light ... and so crippled theoretical physics for the past 200 years. Only those four are generally taught of which none are Maxwell’s. Most of what Tesla tried to do was based on the original quaternions which were removed in Maxwell reference works by the late 1800s and can hardly be found today.


21 posted on 05/30/2016 3:15:26 AM PDT by PIF (They came for me and mine ... now it is your turn ...)
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To: VanDeKoik

I’m frustrated at the lack of Sol System analogs because it makes it less likely to find life-harboring planets, and it makes stable solar systems things that may be extremely rare, which is kind of disturbing.

...

It may be disturbing, but it fits the observations we have, even within our own solar system which is friendly to life. Earth, the most life friendly planet we know has a ratio of biomass to mass of only four parts in ten billion.


22 posted on 05/30/2016 3:32:57 AM PDT by Moonman62 (Th dMake America Great Again!)
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To: ASOC

Sounds similar to a story line from “Gulliver’s Travels.” We must attack the alien solar system because their planets don’t orbit the same as ours.


23 posted on 05/30/2016 5:09:42 AM PDT by ops33 (Senior Master Sergeant, USAF (Retired))
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To: 75thOVI; Abathar; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; ...
Thanks BenLurkin.



24 posted on 05/30/2016 5:19:36 AM PDT by SunkenCiv (I'll tell you what's wrong with society -- no one drinks from the skulls of their enemies anymore.)
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To: BenLurkin; KevinDavis; annie laurie; Knitting A Conundrum; Viking2002; Ernest_at_the_Beach; ...
Thanks BenLurkin.
 
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25 posted on 05/30/2016 5:19:39 AM PDT by SunkenCiv (I'll tell you what's wrong with society -- no one drinks from the skulls of their enemies anymore.)
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