A planetary system around XO-2S

http://arxiv.org/abs/1407.0251

The GAPS programme with HARPS-N@TNG IV: A planetary system around XO-2S

We performed an intensive radial velocity monitoring of XO-2S, the wide companion of the transiting planet-host XO-2N, using HARPS-N at TNG in the framework of the GAPS programme. The radial velocity measurements indicate the presence of a new planetary system formed by a planet that is slightly more massive than Jupiter at 0.48 au and a Saturn-mass planet at 0.13 au. Both planetary orbits are moderately eccentric and were found to be dynamically stable. There are also indications of a long-term trend in the radial velocities. This is the first confirmed case of a wide binary whose components both host planets, one of which is transiting, which makes the XO-2 system a unique laboratory for understanding the diversity of planetary systems.


And also : https://solar-flux.forumotion.com/t959-evidence-for-additional-planet-at-xo-2

Listed:

http://exoplanet.eu/catalog/xo-2s/

The second binary with planets orbiting both components after HD 20782/20781, right?

Interesting that both planets are in the inter-population desert. Also interesting that both stars have RV trends - perhaps XO-2 could have the most giant planets in a single system (though this is stretching the rules)?

There is one Kepler system with at least one planet around each star.

So, cognac with a side-helping of niobium, antimony and scandium then...

As the paper notes, Kepler-132 (KOI-284) has planets around two different stars, though it is not known which star hosts which candidates (the two ~6-day planets cannot orbit the same star due to stability constraints).

IIRC the maximum number of giant planets in a single system so far is four (HR 8799, ups And, HD 141399), no?

Yes (55 Cnc as well). But if XO-2S's RV drift is a third planet, then that with XO-2N's two planets makes the system a five-planet system.

55 Cnc have planets on both stars?

I was mentioning it as another example of a system with four giant planets.

Stalker wrote:

55 Cnc have planets on both stars?

Well, we all wish it has.

Perhaps some bunch of super-Earths or Neptune-mass planets around B...   

Edasich wrote:

Stalker wrote:

55 Cnc have planets on both stars?

Well, we all wish it has.

Perhaps some bunch of super-Earths or Neptune-mass planets around B...   

well my hope is for Earth-size and Mass planets,when they don't detect a super-earth in HZ around of red dwarf I feel more relieve, because there is hope to detect a earth-size and mass in HZ region with more precise future Instruments.

You make me fear I missed this kind of discovery...

Stalker wrote:

You make me fear I missed this kind of discovery...

The best of exoplanet discoveries has yet to come...

Yep, and with SPHERE and Gaïa we enter may be in the golden age of long period planets

Damasso et al. "The GAPS Programme with HARPS-N@TNG V. A comprehensive analysis of the XO-2 stellar and planetary systems"
http://arxiv.org/abs/1501.01424

There appears to have been a turnover in the radial velocity drift of XO-2N. The long-period RV variation is consistent with being due to a stellar activity cycle.