Nearest analog 2M 1207 ?

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Nearest analog 2M 1207 ?

Post by Borislav on 18th January 2010, 7:39 am

http://arxiv.org/abs/1001.2743

According to the model lines in an MJvs. JK diagram (Fig. 14 of Burrows, Sudarsky, & Lunine 2003), we may expect that object B is 1-5 Gyr old and has a mass between 10 and 25 Jupiter masses. Further investigation will show whether objects A+B represent a wide binary brown dwarf or a much older analogue of the young low-mass star+massive planet system 2MASS 1207−3932AB (Gizis 2002; Chauvin et al. 2004).

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Re: Nearest analog 2M 1207 ?

Post by Edasich on 18th January 2010, 11:48 am

If you assume minimum mass of 10 Jupiter masses, likely. 2M 1207 B shows 4 Mj minimum in the mass.

But it seems likely between 10-25 Jupiter masses, averagely 17.5 or 15 Mj.

EPE lists it between unconfirmed candidates:

http://exoplanet.eu/star.php?st=SDSS+141624

Looks rather like a brown low-mass brown dwarf double.
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Re: Nearest analog 2M 1207 ?

Post by Stalker on 19th January 2010, 11:56 am

I do not want create a new topic for that, then I catch occasion to ask a question.

What is the diameter of the brown dwarf 2M1207?
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Re: Nearest analog 2M 1207 ?

Post by Edasich on 19th January 2010, 4:55 pm

I do not want create a new topic for that, then I catch occasion to ask a question.

What is the diameter of the brown dwarf 2M1207?

2.5 Jupiter radii (=0.25 Solar), because of young age

http://en.wikipedia.org/wiki/2M1207
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Re: Nearest analog 2M 1207 ?

Post by Stalker on 30th January 2010, 2:45 pm

your links say that this brown dwarfs are poor in heavy element... a 2-5 Gyrs old metal poor object???
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Re: Nearest analog 2M 1207 ?

Post by Borislav on 30th January 2010, 5:50 pm

Borislav wrote:http://arxiv.org/abs/1001.2743

According to the model lines in an MJvs. JK diagram (Fig. 14 of Burrows, Sudarsky, & Lunine 2003), we may expect that object B is 1-5 Gyr old and has a mass between 10 and 25 Jupiter masses. Further investigation will show whether objects A+B represent a wide binary brown dwarf or a much older analogue of the young low-mass star+massive planet system 2MASS 1207−3932AB (Gizis 2002; Chauvin et al. 2004).

Update #2
http://arxiv.org/PS_cache/arxiv/pdf/1001/1001.2743v2.pdf
With an H−K−1.35 and MH18.1, object B falls outside Fig. 9 (top panel) in Leggett et al. (2010), where these authors compare T dwarf observations with models. However, extrapolating the model line with solar metallicity but high gravity (log g = 5.0) gives the best fit, possibly with a Te f f600 K. Alternatively, a slightly lower metallicity would also fit, but B09 excluded an L subdwarf classification of object A, and the kinematics of the system is clearly not typical of the Galactic halo or thick disk. The blue colour of object A could also be caused by high surface gravity as discussed by Burgasser et al. (2008) for the class of blue L dwarfs. If the high gravity is correct, then the evolution models of Saumon &Marley (2008; their Fig. 4) show that the system is likely 5 Gyr old, and object B could have a mass of 30 Jupiters. Further investigation will show whether objects A+B represent a wide binary brown dwarf or a much older analogue of the young low-mass star+massive planet system 2MASS 1207−3932AB (Gizis 2002; Chauvin et al. 2004).

not analog 2M1207, not planet

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Re: Nearest analog 2M 1207 ?

Post by Edasich on 31st January 2010, 5:23 am

Indeed.
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