Definition of Super-Earth

View previous topic View next topic Go down

Definition of Super-Earth

Post by Stalker on 19th June 2008, 6:50 am

Stalker wrote:There is a definition now as a super-earth.
A super-earth is a planet the mass of which is more important than that of the Earth but lower in 10ME

A superb earth can be:
- Rocky (similar composition in the Earth)
- ferrous (similar composition with Mercury)
- oceanic [Covered with water and with ice (supercritical or not)]
- gaseous (mini-Neptune)

Source (French) in "dernières informations"
avatar
Stalker
Jovian
Jovian

Number of posts : 530
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Edasich on 19th June 2008, 6:52 am

Interesting. Also John M. Dollan typed a similar classification for his ArcBuilders' Universe but this one adds one more subtype
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Stalker on 19th June 2008, 7:02 am

I have some questions to put you down:

What is the theoretical minimal
mass for a gaseous planet?

What is the intervalley of mass for a " neptunian " planet?
Is it 30MT the maximum? (HARPS had concentrated on on the study of superearths and of neprunians planets and the border was 30ME)

Tx
avatar
Stalker
Jovian
Jovian

Number of posts : 530
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Edasich on 19th June 2008, 8:49 am

I think the minimum mass should be around 0.022 and upper limit 0.15 Jupiter masses. Ask Lazarus, he's got many informations
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Stalker on 19th June 2008, 9:01 am

>0.15Mj = metalic hydrogen??
avatar
Stalker
Jovian
Jovian

Number of posts : 530
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Edasich on 19th June 2008, 12:43 pm

Yes, likely Smile

Even >0.22 Mj.

Look HD 149026b 2/3rds of its mass has been found to be rocky. So does HAT-P-3b.
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Stalker on 19th June 2008, 1:00 pm

Tx
avatar
Stalker
Jovian
Jovian

Number of posts : 530
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Stalker on 20th June 2008, 2:44 pm

I have another question. I know that I ask too much question. Excuse
me.
From what mass a superearth can have a mantel of hot ice?
avatar
Stalker
Jovian
Jovian

Number of posts : 530
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Edasich on 20th June 2008, 3:09 pm

I don't know. Maybe 1/3rd or planetary mass. Actually I don't own such data
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Stalker on 20th June 2008, 3:18 pm

I badly expressed myself. What must be the minimal mass of the planet so that of the hot ice is possible form?
avatar
Stalker
Jovian
Jovian

Number of posts : 530
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Edasich on 20th June 2008, 3:28 pm

I don't know. Ask Lazarus
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Stalker on 21st June 2008, 6:54 pm

Is Lazarus a member?
avatar
Stalker
Jovian
Jovian

Number of posts : 530
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Sirius_Alpha on 21st June 2008, 8:10 pm

Stalker wrote:Is Lazarus a member?

Yes, you must be a member to put posts on this site. This is to complicate matters a bit for spammers.

I must say that I've been very busy in "real life" for the past two weeks, and I shall be so for the next two as well. As such, I don't have as much time as I would like to have available, especially for fixing the annoying grey text in the post input fields. I promise though, I will work on it when I can.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3528
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Edasich on 22nd June 2008, 5:04 am

Lazarus owns many informations about astronomy and astrophysics.
Recently we were discussing here. You may check profile and send a private message if you need:

http://solar-flux.forumandco.com/general-questions-f11/carbon-jovians-t33.htm
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Stalker on 22nd June 2008, 6:33 am

Tx
avatar
Stalker
Jovian
Jovian

Number of posts : 530
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Edasich on 22nd June 2008, 6:47 am

Welcome Wink
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Lazarus on 24th June 2008, 8:30 am

Here's a phase diagram of water, you can see the hot ice phases on it. However the p/T range spanned by that phase diagram is not adequate to cover the conditions in planetary interiors. See also this paper which discusses the structures of ocean planets.

The "hot ice" issue is a tricky one, as it is complicated when the planet has internal heat or contains hydrogen. For example, Neptune and Uranus are predicted to be fluid (molecular at the top of the atmosphere, ionic in the mantle) throughout their interiors, possibly with the water and ammonia transitioning to a fluid metallic state near the core (see this paper for details). Thus I am sceptical that the planet Gliese 436b is going to have a solid "hot ice" mantle, as it is a hotter planet than either Uranus or Neptune. Note that both Uranus and Neptune are too hot and dry to support liquid water in the interior: see this paper.
avatar
Lazarus
dG star
dG star

Number of posts : 2894
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Stalker on 24th June 2008, 11:32 am

Tank's Lazarus

Is possible be that there is not lower border as the hot ice.

Callisto
has a nucleus of constricted ice and of rock. The similar for the
mantel of Ganymède. Titan has a mantel of ice constricted
without rocks.
avatar
Stalker
Jovian
Jovian

Number of posts : 530
Age : 26
Location : Paris, France
Registration date : 2008-06-16

View user profile http://exoplanetes.wetpaint.com/

Back to top Go down

Re: Definition of Super-Earth

Post by Edasich on 24th June 2008, 11:40 am

Stalker wrote:Tank's Lazarus

Is possible be that there is not lower border as the hot ice.

Callisto
has a nucleus of constricted ice and of rock. The similar for the
mantel of Ganymède. Titan has a mantel of ice constricted
without rocks.

Yes, but objects you mean lay beyond system's snowline. It's exotic high pressure ice which plays an interesing role in Hot Neptunes, because they seem to form beyond host star's snowline (>2 AUs) and then migrate inwards, in "torch" orbits. Suspect
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by marasama on 30th June 2008, 12:25 pm

What about an Icy analog?
avatar
marasama
SuperEarth
SuperEarth

Number of posts : 212
Location : Earth
Registration date : 2008-04-22

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Edasich on 30th June 2008, 2:23 pm

marasama wrote:What about an Icy analog?

Something like Uranus and Neptune, right? Suspect
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Definition of Super-Earth

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum