Three new planet candidates around very low-mass stars

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Three new planet candidates around very low-mass stars

Post by Sirius_Alpha on 14th November 2011, 5:40 pm

Three new 2M1207-type systems. Masses are highly unconstrained, so they could conceivably be in the planetary mass range or brown dwarf range. But with host star masses < 0.15 Msol, they may be better described as brown dwarfs anyhow.

2M 2206-20 b 30+70-20 MJ
2M 2140+16 b 20+80-20 MJ
2M 0746+20 b 30 25 MJ

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Re: Three new planet candidates around very low-mass stars

Post by Daniel on 14th November 2011, 6:30 pm

I still don't understand why put this object on exoplanet catalog in the EPE. they don't ever know if this object are a least in the planetary mass regime.if so many brown Dwarfs should be on this catalog too.

It's likely that is object are brown dwarfs and not planets
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Re: Three new planet candidates around very low-mass stars

Post by Sirius_Alpha on 14th November 2011, 6:38 pm

IIRC, if the 1σ error overlaps with the mass range of ≤ 20 MJ, then they qualify for inclusion into the EPE. The error bars for these three planets does overlap some with the planetary mass range. When their masses are better constrained, and if they're found to be outside the planetary mass regime, they will be removed from the list of candidates (See ChaHα 8 b, though IIRC, it was redacted at a time when the mass limit for the EPE was 13 MJ).

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Re: Three new planet candidates around very low-mass stars

Post by Lazarus on 14th November 2011, 6:49 pm

More objects which show that the definition of "planet" is not simple in this mass range!
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