Hints of planet formation at EE Cep?

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Hints of planet formation at EE Cep?

Post by Sirius_Alpha on 6th October 2009, 4:16 am

Multi-ring structure of the eclipsing disk in EE Cep - possible planets?
http://fr.arxiv.org/abs/0910.0432

Abstract wrote:The photometric and spectroscopic observational campaign organized for the 2008/9 eclipse of EE Cep revealed features, which indicate that the eclipsing disk in the EE Cep system has a multi-ring structure. We suggest that the gaps in the disk can be related to the possible planet formation.

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Re: Hints of planet formation at EE Cep?

Post by Edasich on 6th October 2009, 6:44 am

But it doesn't mention where such gaps are located, does it?

Plus it seems the star is a spectroscopic binary and authors seem have ignored this.
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Re: Hints of planet formation at EE Cep?

Post by Sirius_Alpha on 6th October 2009, 8:53 am

The binarity of EE Cep is certainly not ignored, it's discussed throughout the paper albeit indirectly.

Or do you mean that one of the components of EE Cep are binary? (Making EE Cep a tripple system?) This would seem unlikely, as the authors give a mutual orbital of the two stars as 5.6 yr.

Edasich wrote:But it doesn't mention where such gaps are located, does it?
Yeah....

Well, you can find the hill sphere of the disk-host, and assume that this is the extent of the disk. Then use the graphic they provide, use Pythagorean theorem to find the width of the disk and locations of gaps in pixels, and it should be simple to get the distance of the gap from the star (Don't count on it)

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Re: Hints of planet formation at EE Cep?

Post by Edasich on 6th October 2009, 9:45 am

Just an easy walk... Laughing

However such planets (if present) are quite hard to detect through RV analysis and even more difficult via imaging.
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Re: Hints of planet formation at EE Cep?

Post by Lazarus on 6th October 2009, 3:23 pm

So... an Epsilon Aurigae analogue system (in the sense that the primary is eclipsed by what seems to be a disk - Epsilon Aurigae is a more extreme system than EE Cephei)

You'd think such an environment would be quite hostile to planet formation. Binarity makes things tricky - various resonances could be causing the disc structure maybe?
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