Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: RR Cae - Circumbinary Planet(s?) 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 - Quote :
- 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.
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Last edited by Sirius_Alpha on 9th October 2013, 7:31 am; edited 1 time in total | |
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Edasich dK star
Number of posts : 2292 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: RR Cae - Circumbinary Planet(s?) 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. | |
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: RR Cae - Circumbinary Planet(s?) 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. | |
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: RR Cae - Circumbinary Planet(s?) 9th October 2013, 7:32 am | |
| _________________ Caps Lock: Cruise control for 'Cool'!
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Edasich dK star
Number of posts : 2292 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: RR Cae - Circumbinary Planet(s?) 9th October 2013, 12:30 pm | |
| It is a nearby WD-M dwarf binary after all (12 pc). | |
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: RR Cae - Circumbinary Planet(s?) 9th October 2013, 2:52 pm | |
| So the Exoplanet Archive is not affected by the government shutdown then? | |
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: RR Cae - Circumbinary Planet(s?) 9th October 2013, 9:16 pm | |
| It's a caltech.edu site, not a .gov site. _________________ Caps Lock: Cruise control for 'Cool'!
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: RR Cae - Circumbinary Planet(s?) 20th September 2021, 9:07 pm | |
| _________________ Caps Lock: Cruise control for 'Cool'!
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