Good news for Gliese 581c, bad news for d?

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Good news for Gliese 581c, bad news for d?

Post by Lazarus on 7th February 2009, 7:37 am

From http://www.tat.physik.uni-tuebingen.de/~fgp/Conf09/abstractbooklet.pdf - abstract titled "Extrasolar planets in the Gliese 581 system Model Atmospheres and Implications for Habitability"

The conclusions presented seem to imply that liquid water is possible on Gliese 581c, but Gliese 581d would be too cold to support life, a conclusion which goes against the previous studies of the system.
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Re: Good news for Gliese 581c, bad news for d?

Post by NuclearVacuum on 7th February 2009, 11:14 am

That is really interesting. But would Gliese 581 c be quenched with water, or (more likely) have pockets of water and be a huge desert planet and or jungle planet?

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Re: Good news for Gliese 581c, bad news for d?

Post by Sirius_Alpha on 7th February 2009, 3:06 pm

If Gliese 581 c formed beyond the snow line and migrated inward, it's going to have a lot of water.

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Re: Good news for Gliese 581c, bad news for d?

Post by Lazarus on 7th February 2009, 4:03 pm

Well I'd like to see the actual results to see the explanation for how Gliese 581c manages to avoid the greenhouse feedback while receiving more energy per unit area than Venus does.
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Re: Good news for Gliese 581c, bad news for d?

Post by NuclearVacuum on 7th February 2009, 4:31 pm

Sirius_Alpha wrote:If Gliese 581 c formed beyond the snow line and migrated inward, it's going to have a lot of water.

Really? I thought that it would have only pockets of water (being in the inner hz). How did you come up with that scenario?

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Re: Good news for Gliese 581c, bad news for d?

Post by Lazarus on 7th February 2009, 4:51 pm

The question is whether there would be enough material to build the various planets of the Gliese 581 system in situ, which seems unlikely. The inner hot Neptune (b) probably formed beyond the snowline and migrated inwards to its current location. So unless the ordering of the planets has changed, planets c and d formed further out.
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Re: Good news for Gliese 581c, bad news for d?

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