Eccentric planet versus 2:1 resonance

View previous topic View next topic Go down

Eccentric planet versus 2:1 resonance

Post by Lazarus on 9th September 2008, 7:52 am

Apparently several of the eccentric planets in the current lists of exoplanets may actually be systems with 2:1 resonant orbits in disguise. (Similar to the discovery of Gliese 876c)

arXiv: How eccentric orbital solutions can hide planetary systems in 2:1 resonant orbits

We find that a significant fraction of the published eccentric one-planet solutions might instead be multiple planet systems in near circular orbits, and that several planets with masses comparable to Earth could have already been detected.
(emphasis mine)
avatar
Lazarus
dG star
dG star

Number of posts : 2783
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Edasich on 9th September 2008, 2:23 pm

I've noticed the presence of WASP-10 in planetary table at page 8.
May even that one hide additional (low mass) planets? Who knows...
I should try a Systemic Console simulation.
avatar
Edasich
dM star
dM star

Number of posts : 1502
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Darkness nova on 15th September 2008, 8:35 pm

This is interesting and potentially both creepy even if it does happen allt he time "aka we got the data wrong and I've been modlin the wrong planets" but it also makes the potentail systems even more intresting.

Darkness nova
Asteroid
Asteroid

Number of posts : 69
Location : Octans
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Sirius_Alpha on 16th September 2008, 3:17 pm

I certainly hope this is a common scenario... there are a lot of eccentric jovians that have been detected.

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

Number of posts : 3416
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

are some planets actually two 1:2 resonant planets?

Post by youknowandy on 27th September 2008, 2:41 am

Something to ponder. Someone is saying that at least half of the currently detected planets could actually be two smaller planets in a 1:2 orbital resonance.

http://space.newscientist.com/article/mg19926755.600-have-we-already-found-a-planet-like-earth.html
avatar
youknowandy
Meteor
Meteor

Number of posts : 27
Registration date : 2008-06-16

View user profile

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Lazarus on 27th September 2008, 6:52 am

(this post no longer necessary now threads have been merged)


Last edited by Lazarus on 27th September 2008, 1:34 pm; edited 2 times in total
avatar
Lazarus
dG star
dG star

Number of posts : 2783
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by NuclearVacuum on 27th September 2008, 9:15 am

That does actually make a lot of sense. There are some planets who's mass is not pinpointed exactly. I always assumed that may be the affect of a double planet, but this could be a good hypothesis Like a Star @ heaven
avatar
NuclearVacuum
Terrestrial Planet
Terrestrial Planet

Number of posts : 155
Age : 27
Location : Delta Trianguli
Registration date : 2008-07-05

View user profile http://nuclearvacuum.wikia.com

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Lazarus on 27th September 2008, 10:59 am

I think we should merge the threads about this...
avatar
Lazarus
dG star
dG star

Number of posts : 2783
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Sirius_Alpha on 27th September 2008, 12:51 pm

Good idea; merged.

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

Number of posts : 3416
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Darkness nova on 1st October 2008, 4:21 pm

Hmm....now to see peoples redo the numbers....which I really hope doesn't take a loooong time.

I wonder how much equipment one need to do these things....make it soooooo much easier if a well versed amateur with some money could do so....((Hurray impatience.))

Darkness nova
Asteroid
Asteroid

Number of posts : 69
Location : Octans
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Sirius_Alpha on 1st October 2008, 6:40 pm

It's a matter of gathering more, precise RV data.

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

Number of posts : 3416
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Lazarus on 2nd October 2008, 7:24 am

Thing is this is a so-called degeneracy: you can't tell the difference between the two situations until planet-planet interactions cause the system to evolve (so redoing the numbers with existing data isn't really going to prove anything). Depending on the masses and orbital periods, it might be some time before this becomes apparent, so long-term monitoring of these systems is important.
avatar
Lazarus
dG star
dG star

Number of posts : 2783
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Darkness nova on 12th October 2008, 5:55 pm

Long term eh?

Exactley HOW long term are we talking here?

Darkness nova
Asteroid
Asteroid

Number of posts : 69
Location : Octans
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

Post by Sirius_Alpha on 12th October 2008, 7:56 pm

Depends really on the system. If the planet-planet interactions are stronger, and thus the orbits of the planets evolve faster, then it'll be sooner than if the planet-planet interactions are barely detectable. I'd say it would typically be decades of collecting data for the average (stable) system though.

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

Number of posts : 3416
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: Eccentric planet versus 2:1 resonance

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