A planetary system around XO-2S

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A planetary system around XO-2S

Post by Led_Zep on 1st July 2014, 9:20 pm

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 : http://solar-flux.forumandco.com/t959-evidence-for-additional-planet-at-xo-2
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Re: A planetary system around XO-2S

Post by Edasich on 2nd July 2014, 9:59 am

Listed:

http://exoplanet.eu/catalog/xo-2s/
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Re: A planetary system around XO-2S

Post by Shellface on 2nd July 2014, 10:40 am

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)?

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Re: A planetary system around XO-2S

Post by Stalker on 2nd July 2014, 11:47 am

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

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Re: A planetary system around XO-2S

Post by Lazarus on 2nd July 2014, 1:10 pm

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?
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Re: A planetary system around XO-2S

Post by Sirius_Alpha on 2nd July 2014, 1:19 pm

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.

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Re: A planetary system around XO-2S

Post by Stalker on 2nd July 2014, 2:02 pm

55 Cnc have planets on both stars?

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Re: A planetary system around XO-2S

Post by Sirius_Alpha on 2nd July 2014, 2:21 pm

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

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Re: A planetary system around XO-2S

Post by Edasich on 2nd July 2014, 3:22 pm

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...  cyclops 
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Re: A planetary system around XO-2S

Post by Daniel on 2nd July 2014, 4:58 pm

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...  cyclops 

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.
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Re: A planetary system around XO-2S

Post by Stalker on 3rd July 2014, 3:16 am

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

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Re: A planetary system around XO-2S

Post by Edasich on 3rd July 2014, 5:05 am

Stalker wrote:You make me fear I missed this kind of discovery...

The best of exoplanet discoveries has yet to come... Wink
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Re: A planetary system around XO-2S

Post by Stalker on 3rd July 2014, 6:19 am

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

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Re: A planetary system around XO-2S

Post by Lazarus on 8th January 2015, 3:04 pm

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.
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