questions about GJ 676 and Gl 163 and more

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questions about GJ 676 and Gl 163 and more

Post by Stalker on 2nd May 2013, 11:50 am

Hi

I have some questions about two extrasolar system (maybe more).

The first is why none of the planets of GJ 676 A are considered as confirmed by EPE?

The second is about Gl 163. For some websites there is a super earth in the habitable zone (HEC for example) and for other websits there is only gas giants on different orbits. Sadly I cant find any paper about this system. Can you help me?

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Re: questions about GJ 676 and Gl 163 and more

Post by Sirius_Alpha on 2nd May 2013, 12:23 pm

The EPE seems to have completely missed the GJ 676A paper. I believe it came out when the EPE was inactive due to their maintenance.
I never saw a GJ 163 paper. Just a news article on a university site or something like that.

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Re: questions about GJ 676 and Gl 163 and more

Post by Stalker on 2nd May 2013, 12:31 pm

But the GJ 676A system appear in the controversial catalog. It's strange.

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Re: questions about GJ 676 and Gl 163 and more

Post by Shellface on 2nd May 2013, 1:21 pm

Gliese 163 hasn't had a (dedicated) paper yet, like a lot of HARPS detections - just an announcement. Still, looking at the EPE it appears that the masses are off by a decimal point (i.e: 0.354 MJup is approximately Saturn-mass, but 0.0354 MJup is 11 MEarth; 0.226 MJup -> 0.0226 MJup = 7 MEarth. This also happened to HD 77338 b in the EPE). The period for b also seems to be wrong, as the period from HARPS archive data is 8.63 days rather than 0.63 days (the semimajor axis seems correct, though). The period for c is confirmable, though there is a necessary additional periodicity of 555 days (though I believe a "possible outer planet" was mentioned on the HEC article on the discovery? Keep that tentative for now).

Sirius is probably right for Gliese 676 A. Not sure why Ab is listed as unconfirmed though, seeing as HIP 12961 b is listed as confirmed and they're from the same announcement and paper. The four planets found by Anglada-Escudé and Tuomi are confirmable, though the period for Ac is not really constrained because no maximum has been observed.

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Re: questions about GJ 676 and Gl 163 and more

Post by Stalker on 2nd May 2013, 2:00 pm

Ok thanks you Smile

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Re: questions about GJ 676 and Gl 163 and more

Post by Lazarus on 2nd May 2013, 2:41 pm

IIRC GJ 676 Ab was in the EPE's confirmed list until the 4-planet system paper appeared on arXiv.
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Re: questions about GJ 676 and Gl 163 and more

Post by Daniel on 2nd May 2013, 7:41 pm

Well I personally don't follow EPE anymore, since that update the webpage turn in a mess with loads of missing planets and other things like lost and/or wrong data
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Re: questions about GJ 676 and Gl 163 and more

Post by Stalker on 3rd May 2013, 12:54 am

Daniel wrote:Well I personally don't follow EPE anymore, since that update the webpage turn in a mess with loads of missing planets and other things like lost and/or wrong data

So what is your favorite exoplanet catalog? The Open one?

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Re: questions about GJ 676 and Gl 163 and more

Post by Lazarus on 3rd May 2013, 4:22 pm

The Exoplanet Data Explorer is pretty good, especially in terms of the maturity of its user interface. Updates are fairly infrequent though.
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Re: questions about GJ 676 and Gl 163 and more

Post by Daniel on 3rd May 2013, 10:36 pm

Stalker wrote:
Daniel wrote:Well I personally don't follow EPE anymore, since that update the webpage turn in a mess with loads of missing planets and other things like lost and/or wrong data

So what is your favorite exoplanet catalog? The Open one?

Normally I do My own catalog,and keep in my mind the ones that are not in the EPE
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Re: questions about GJ 676 and Gl 163 and more

Post by Stalker on 5th May 2013, 8:35 am

What are the other planets missing in EPE?

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Re: questions about GJ 676 and Gl 163 and more

Post by Sirius_Alpha on 6th May 2013, 10:48 am

Well, EPE just promoted GJ 676A b to confirmed candidates.
http://exoplanet.eu/catalog/gj_676a_b/

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Re: questions about GJ 676 and Gl 163 and more

Post by Edasich on 11th May 2013, 4:03 am

I wonder what's with the three other left...
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Re: questions about GJ 676 and Gl 163 and more

Post by Lazarus on 11th May 2013, 8:57 am

Not sure GJ 676 Ac is quite at the "confirmed" stage anyway.

IMO the decision to assign "d" and "e" to the inner planets leaves things open for a Mu Arae-style renaming once object "c" completes an orbit.
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Re: questions about GJ 676 and Gl 163 and more

Post by Edasich on 11th May 2013, 10:21 am

I see. I think naming planets in order from innermost to outermost would be more practical (b, c, d...) than by discovery date, as for some Kepler planet candidates.

Nice to see some updates at EPE, though there are still 20 or so planets left to add.
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