Planetary companions around 42 Draconis and HD 139357

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Planetary companions around 42 Draconis and HD 139357

Post by Edasich on 20th March 2009, 6:09 am

Waiting for discovery paper, here I post from EPE


DOELINGER M., HATZES A., PASQUINI L., GUENTHER E., HARTMANN M. & GIRARDI L. , 2009 (update : 20 March 2009)

Planetary companion candidates around the K giant stars 42 Draconis and HD 139357

Astron. & Astrophys.
, - , -
accepted

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Re: Planetary companions around 42 Draconis and HD 139357

Post by Michael Johne on 23rd March 2009, 3:28 am

Hi!

Here is the paper: http://arxiv.org/abs/0903.3593

Bye!

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Re: Planetary companions around 42 Draconis and HD 139357

Post by Edasich on 23rd March 2009, 6:13 am

Thanks, Michael. Very Happy

I'm noticing a little delay between posting the paper link at EPE and making the "Note for star...." page. Rolling Eyes

However 42 Draconis really looks like an old Sun close to die. sunny

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Re: Planetary companions around 42 Draconis and HD 139357

Post by Lazarus on 23rd March 2009, 5:14 pm

Hmm 42 Dra b would have been located quite close to the main sequence habitable zone. Not that it really matters so much for a gas giant. And the system is very low metallicity: [Fe/H] = -0.46, i.e. 35% solar.

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Re: Planetary companions around 42 Draconis and HD 139357

Post by Sirius_Alpha on 23rd March 2009, 8:18 pm

Perhaps any hypothetical moons of 42 Dra b may have been habitable.

Would a system with low metallicity crank out more moons than a system with high metallicity? The trend so far favors gas planets around high-metallicity stars, and low-mass planets around metal-poor stars.

That's probably a topic for another thread though. And needless to say, there isn't a lot of data points concerning the types of moons around various exoplanets.

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Re: Planetary companions around 42 Draconis and HD 139357

Post by Lazarus on 24th March 2009, 3:29 pm

Indeed. There are several important questions that need to be answered (of which the issue of formation is just one) before I'm convinced by the habitable moon idea.

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