Possible the first photographic planet from red dwarf

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Possible the first photographic planet from red dwarf

Post by Borislav on 16th February 2010, 6:01 am

http://arxiv.org/abs/1002.2637
The latest-type object, classified as T8-9, shares its large proper motion with Ross 458 (BD+13o2618), an active M0.5 binary which is 102" away, forming a hierarchical low-mass star+brown dwarf system. Ross 458C has an absolute J-band magnitude of 16.4, and seems overluminous, particularly in the K band, compared to similar field brown dwarfs. We estimate the age of the system to be less than 1 Gyr, and its mass to be as low as 14 Jupiter masses for the age of 1 Gyr.


They find a degeneracy between (higher) metallicity and (lower) gravity on the 2.2 and 4.5
μm fluxes, but for the Solar metallicity of Ross 458AB and a distance of 16 pc, they favour Teff= 600K, g= 100m.s2, R= 0.12 R, M =58MJup and an age of 0.10.2 Gyr. This is again a strong indication of the youth of Ross 458ABC, and the very small mass of Ross 458C.


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Re: Possible the first photographic planet from red dwarf

Post by Sirius_Alpha on 16th February 2010, 2:48 pm

Given the difficulty in producing massive planets around red dwarfs, I would think this would probably be more a brown dwarf than a planet.

But then again, if HD 41004 Bb can get into the EPE, maybe this one can too.

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Re: Possible the first photographic planet from red dwarf

Post by Lazarus on 16th February 2010, 4:07 pm

It's located at a projected separation of over 1100 AU from the Ross 458 AB binary. Hints it is probably best to regard this as a brown dwarf.
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Re: Possible the first photographic planet from red dwarf

Post by Edasich on 16th February 2010, 4:44 pm

Mass range spans between 5 and 8 Jupiter masses, but such value could likely increase.
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Re: Possible the first photographic planet from red dwarf

Post by Borislav on 17th February 2010, 5:49 am

New article about Ross 458C
http://arxiv.org/abs/1002.3073

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