Gliese 176b does not exist. Meet Gliese 176b.

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Gliese 176b does not exist. Meet Gliese 176b.

Post by Lazarus on 5th September 2008, 4:51 am

The HARPS search for southern extra-solar planets: XIV. Gl 176b, a super-Earth rather than a Neptune, and at a different period
The 10-day planet of 24 Earth masses has not been confirmed. Instead there appears to be an 8.4-Earth mass planet in an 8.78-day orbit.

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Re: Gliese 176b does not exist. Meet Gliese 176b.

Post by Sirius_Alpha on 5th September 2008, 6:10 pm

A very interesting bit of news. In the paper, they compare the HARPS RV data and the previous DATA... and the two look like they're completely different planets. The RV curve seems visibly different between the two datasets, even considering the additional error in the previous data.

The authors of the paper also point out that they're unsure as to why the earlier solution was a 24 Earth-mass planet.

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Re: Gliese 176b does not exist. Meet Gliese 176b.

Post by Darkness nova on 6th September 2008, 9:31 pm

Title confused me however.....this begs the question of how many more planets might not be right if any? I suspect this really applies to planets that are much much less massive than jupiter and ones that orbit m dwarfs and possibly late k dwarfs where a jupiter mass planet would be affect it more than it would around a larger star so that conversely an earth mass planet would also affect it more making the data more confusing when adding other factors like multiple planets and for younger ones flares and there activity.

Also the correlation between super earths and M dwarfs could be a good sign for possible habitable planets and make m dwarfs an even better candidate for DAWN and other missions like it.

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Re: Gliese 176b does not exist. Meet Gliese 176b.

Post by Sirius_Alpha on 6th September 2008, 10:36 pm

DAWN?

Perhaps you mean Darwin?

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Re: Gliese 176b does not exist. Meet Gliese 176b.

Post by Darkness nova on 6th September 2008, 10:57 pm

Yeah I did mean darwin. No idea where I got dawn from.

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Re: Gliese 176b does not exist. Meet Gliese 176b.

Post by Sirius_Alpha on 6th September 2008, 11:08 pm

Yeah, with the apparent death of SIM Planet Quest and the TPF, I'm really looking forward to Darwin.

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Re: Gliese 176b does not exist. Meet Gliese 176b.

Post by Darkness nova on 7th September 2008, 12:18 am

We all are. IT's the only one left and it had BETTER NOT BE CANCELED!

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Re: Gliese 176b does not exist. Meet Gliese 176b.

Post by Sirius_Alpha on 19th December 2010, 12:02 am

Gliese 176 c?
http://exoplanet.eu/planet.php?p1=GJ+176&p2=c

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Re: Gliese 176b does not exist. Meet Gliese 176b.

Post by Lazarus on 19th December 2010, 6:38 am

The paper referenced for the Gliese 176b parameters makes a pretty good case for the 40-day signal being activity-related, concluding
Section 4 however demonstrates that the rotation period of Gl 176 coincides with the longer of these two Keplerian periods. The stellar flux and the Ca II H+K emission vary with that period, with a phase relative to the velocity variations consistent with a magnetic spot on the stellar surface. As a consequence, some, and probably all, of the 40-day radial-velocity signal must originate in the spot.

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Re: Gliese 176b does not exist. Meet Gliese 176b.

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