Gliese 581d in the habitable zone

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Gliese 581d in the habitable zone

Post by Lazarus on 6th May 2011, 3:43 am

This time using a 3-dimensional global climate model...
Gliese 581d is the first discovered terrestrial-mass exoplanet in the habitable zone

Needs around 10 bar of carbon dioxide in the atmosphere.
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Re: Gliese 581d in the habitable zone

Post by tommi59 on 6th May 2011, 4:01 am

We can not check possible composition due lack of transit but in my opinion considering low density of kepler 11 planets and low metallicity of host star is very unlikely planet d as terrestial planet simply next minineptune with around 2.0g/cm3 density


Last edited by tommi59 on 6th May 2011, 4:02 am; edited 1 time in total
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Re: Gliese 581d in the habitable zone

Post by Sirius_Alpha on 6th May 2011, 4:02 am

I tend to agree with you there.

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Re: Gliese 581d in the habitable zone

Post by tommi59 on 6th May 2011, 4:10 am

I am not sure about possibility of creating co2 in atmosphere of water ,ice planet but with deep 500km ocean I dont expect any life.Planetary biology give HZ between 0.1-0.15 AU around this star-so this planet require at least 5.0 g/cm density and 10 bar co2 in air -very unlikely.
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Re: Gliese 581d in the habitable zone

Post by tommi59 on 6th May 2011, 9:08 am

Although I am not sure http://arxiv.org/abs/1105.0021
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Re: Gliese 581d in the habitable zone

Post by Lazarus on 6th May 2011, 8:04 pm

On the cold edge of the habitable zone the gaseous H2/He atmosphe might actually be helpful to habitability (provided there is not so much that it exceeds the critical pressure). Gliese 581d remains a potentially-habitable planet either way...
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Re: Gliese 581d in the habitable zone

Post by tommi59 on 7th May 2011, 3:09 am

Potentially habitable -ok but what composition of 581d you meant lazarus??
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Re: Gliese 581d in the habitable zone

Post by Sirius_Alpha on 7th May 2011, 3:20 am

He's talking about a composition that has a gaseous-to-solid boundary (like your typical terrestrial planet), as opposed to a gradual transition from gaseous to solid (like a mini-Neptune or gas giant).

Lazarus wrote:(provided there is not so much that it exceeds the critical pressure)

Critical point.
"A critical point specifices the conditions (temperature, pressure, and sometimes composition) at which a phase boundary ceases to exist."

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