RR Cae - Circumbinary Planet(s?)

View previous topic View next topic Go down

RR Cae - Circumbinary Planet(s?)

Post by Sirius_Alpha on 22nd January 2012, 9:10 pm

Another cirumbinary planet. And, as seems to be ubiquitous for such systems (Kepler objects aside), there's evidence for a second planet.

A Circumbinary Planet in Orbit Around the Short-Period White-Dwarf Eclipsing Binary RR Cae
http://arxiv.org/abs/1201.4205

By using six new determined mid-eclipse times together with those collected from the literature, we found that the Observed-Calculated (O-C) curve of RR Cae shows a cyclic change with a period of 11.9 years and an amplitude of 14.3s, while it undergoes an upward parabolic variation (revealing a long-term period increase at a rate of dP/dt =+4.18(+-0.20)x10^(-12). The cyclic change was analyzed for the light-travel time effect that arises from the gravitational influence of a third companion. The mass of the third body was determined to be M_3*sin i' = 4.2(+-0.4) M_{Jup} suggesting that it is a circumbinary giant planet when its orbital inclination is larger than 17.6 degree. The orbital separation of the circumbinary planet from the central eclipsing binary is about 5.3(+-0.6)AU. The period increase is opposite to the changes caused by angular momentum loss via magnetic braking or/and gravitational radiation, nor can it be explained by the mass transfer between both components because of its detached configuration. These indicate that the observed upward parabolic change is only a part of a long-period (longer than 26.3 years) cyclic variation, which may reveal the presence of another giant circumbinary planet in a wide orbit.


Last edited by Sirius_Alpha on 9th October 2013, 7:31 am; edited 1 time in total

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

Number of posts : 3403
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: RR Cae - Circumbinary Planet(s?)

Post by Edasich on 23rd January 2012, 5:03 am

I was sure this one could harbour planet(s).

I wonder about QS Virginis, wheter they have got a new orbital solution of this year.
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: RR Cae - Circumbinary Planet(s?)

Post by Lazarus on 23rd January 2012, 3:27 pm

Post common-envelope binaries do seem to be good targets for this kind of thing...

That paper does reference the 2-planet solution for QS Virginis, however from what I can tell it would be unstable. I suspect we haven't heard the last of that one.
avatar
Lazarus
dG star
dG star

Number of posts : 2772
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: RR Cae - Circumbinary Planet(s?)

Post by Sirius_Alpha on 9th October 2013, 7:32 am

RR Cae (AB)b has now made it to the NASA Exoplanet Archive as GJ 2034.
http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=GJ+2034&type=CONFIRMED_PLANET

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

Number of posts : 3403
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: RR Cae - Circumbinary Planet(s?)

Post by Edasich on 9th October 2013, 12:30 pm

It is a nearby WD-M dwarf binary after all (12 pc).
avatar
Edasich
dM star
dM star

Number of posts : 1500
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: RR Cae - Circumbinary Planet(s?)

Post by Lazarus on 9th October 2013, 2:52 pm

So the Exoplanet Archive is not affected by the government shutdown then?
avatar
Lazarus
dG star
dG star

Number of posts : 2772
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: RR Cae - Circumbinary Planet(s?)

Post by Sirius_Alpha on 9th October 2013, 9:16 pm

It's a caltech.edu site, not a .gov site.

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

Number of posts : 3403
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: RR Cae - Circumbinary Planet(s?)

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