Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

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Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

Post by Sirius_Alpha on 31st December 2014, 12:30 am

http://www.gizmag.com/earth-like-planets-milky-way-kepler-koi-3158/35378/

YouTube video of a presentation of the system given in October 2014.
https://www.youtube.com/watch?v=QEIokMsMUbY


Last edited by Sirius_Alpha on 26th January 2015, 9:32 pm; edited 1 time in total

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Re: Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

Post by Led_Zep on 31st December 2014, 7:23 am


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Re: Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

Post by Shellface on 31st December 2014, 10:53 am

Definitely a fascinating system. Some of the smallest planets discovered, around (I believe) the densest star with photometric astroseismology, in a tight triple system.

The companion binary lies at a projected separation of only 65 AU! That must have severely truncated the protoplanetary disk. The two should also cause a large RV trend, which I hope has been detected.

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Re: Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

Post by tommi59 on 31st December 2014, 5:38 pm

Any precise mass measurement for these planets are expected from ttv?

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Re: Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

Post by Shellface on 31st December 2014, 6:53 pm

Towards the end of the talk video it's mentioned that the resonant TTV signal is marginally detected for the outermost pair of planets. I expect, due to Kepler's precision floor, the bottom table Led_Zep showed from last year hasn't been improved much.

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Re: Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

Post by Lazarus on 5th January 2015, 4:43 pm

Always nice when Kepler systems turn out to be Hipparcos stars. (KOI-3158 = HIP 94931)

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Re: Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

Post by Sirius_Alpha on 26th January 2015, 9:34 pm

Now on arXiv, listed as Kepler-444.

An ancient extrasolar system with five sub-Earth-size planets
http://arxiv.org/abs/1501.06227

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Re: Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

Post by Led_Zep on 27th January 2015, 2:05 pm

New Scientist :
http://www.newscientist.com/article/dn26856-ancient-planets-are-almost-as-old-as-the-universe.html#.VMfQWHx0zIV

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Re: Kepler-444 / KOI-3158 : Five sub-Earth-sized planets orbiting a K dwarf

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