Planetary Masses - 3rd attempt

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Planetary Masses - 3rd attempt

Post by marasama on 7th July 2008, 12:09 am

TYPEMASS
Brown Dwarf
if [Fe/H] > 0, then ~13 to ~65Mj
if [Fe/H] = 0, then ~13 to ~80Mj
if [Fe/H] < 0, then ~13 to ~80-90Mj
Transitional Planets
Mass between 12-14Mj, due to metallicity
Gray-area between planet & sub-brown dwarf
Mass at ~5 to 12Mj
Electron degeneracyBegins at ~2Mj
Metallic hydrogenBegins at ~0.1Mj / 31.8Me
Ability to start accreting gas
Begins at ~7-15Me
Ability to maintain volatile?

Ability to maintain a tenuous atmosphere?

Any suggestions/criticisms would is welcomed.

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Re: Planetary Masses - 3rd attempt

Post by Edasich on 7th July 2008, 5:26 am

I would set limit to "ability to mantain volatile" between <0.15-5 Me.
And "mantaining a tenuous atmosphere" between <0.05-<0.1 Me.
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Re: Planetary Masses - 3rd attempt

Post by Sirius_Alpha on 7th July 2008, 3:04 pm

A very interesting table! Where did you get the information for it?

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Re: Planetary Masses - 3rd attempt

Post by Edasich on 7th July 2008, 3:28 pm

John M. Dollan wrote interesting Planetary Classification about

Available here at his site:

http://arcbuilder.home.bresnan.net/PCLMaster.html
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Re: Planetary Masses - 3rd attempt

Post by Lazarus on 7th July 2008, 3:34 pm

Note that electron degeneracy starts much, much earlier than 2 Jupiter masses: it is a minor contribution even in everyday solids, and degeneracy pressure is at least partially responsible for holding up the cores of even low mass planets.

It is at ~2 Jupiter masses where the dominant contribution to the core pressure is degeneracy pressure rather than electrostatic repulsion, so increasing mass results in decreasing radius.
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Re: Planetary Masses - 3rd attempt

Post by Edasich on 8th July 2008, 5:56 am

I wonder why they've still not given Lazarus Nobel Prize Laughing
His knowledge seems infinite... Rolling Eyes
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Re: Planetary Masses - 3rd attempt

Post by Sirius_Alpha on 8th July 2008, 9:22 am

Edasich wrote:His knowledge seems infinite...
I know, right. Lazarus is very, very knowledgable. I admire him for it. It makes me wonder though... Lazarus if you don't mind me asking, what is your level of formal education?

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Re: Planetary Masses - 3rd attempt

Post by Edasich on 8th July 2008, 11:56 am

According to me he's a Nobel scientist which's hiding beyond anonymous forum user ... *lol: lol!
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Re: Planetary Masses - 3rd attempt

Post by marasama on 8th July 2008, 3:52 pm

I got the table from previous entries in extrasolar forum, very long time ago.

What would be the electron degeneracy mass be at?

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Re: Planetary Masses - 3rd attempt

Post by marasama on 26th November 2008, 7:56 pm

This is a rough outline on the major classes based on only the mass.
*Brown Dwarfif [Fe/H] > 0, then ~13 to ~65Mj
if [Fe/H] = 0, then ~13 to ~80Mj
if [Fe/H] < 0, then ~13 to ~80-90Mj
ACrossover Planetmasses around and above ~13Mj.
BSuper Giant Planetabove Jupiter, maybe ~5-12Mj
CGiant Planetwhere Jupiter is
DSubgiant Planetmaybe Saturn
maybe around the metallic hydrogen formation? ~0.1Mj / 31.8Me
ETransitional Planetwhere the mass is enough to being the process of being a gas giant
~7-15Me
FDwarf Planetwhere Earth is
GSubdwarf Planetwhere Mercury is
HPlanetoidwhere Ceres is
ISubplanetoidsmaller asteroids and giant boulders
I'm thinking Pluto will probably at G (Subdwarf Planet) area, since it still has significant atmospheric activities. But it could also be cause it is far out in the cold. Need to wait and see if they find something smaller beyond Neptune and see if it still exhibit an atmopheric change.

I'll update this if I or anyone have any new information.

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Re: Planetary Masses - 3rd attempt

Post by Sirius_Alpha on 26th November 2008, 8:06 pm

So your classification would group Saturn, Uranus, Neptune, and Gliese 436 b into a single category?

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Re: Planetary Masses - 3rd attempt

Post by marasama on 26th November 2008, 8:41 pm

Uranus = 14.536Me
Neptune = 17.147Me
Gliese 436b = 22.21.0Me
Saturn = 95.152Me

So far it looks:
Saturn = subgiant planet
Gliese 436b = crossing between the transitional/subgiant planet range
Neptune = crossing between the transitional/subgiant planet range
Uranus = probably going to be in the transitional planet

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