A Brown Dwarf Main Topic

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How about a topic about ONLY brown dwarfs orbiting stars, orbiting each other and stand alone?

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A Brown Dwarf Main Topic

Post by Edasich on 21st November 2008, 6:52 am

We have "Unconfirmed/Unpublished Exoplanets Catalogue" for doubtful or suspected planetary objects. As you know, dear John Whatmough's original site included an "Extrasolar Planets Catalogue" and a "Brown Dwarfs List".

How about making a post about ONLY brown dwarf objects (i.e substellar non-planetary objects). It should include both brown dwarfs orbiting around standard stars (ex. GJ 229 B, 15 Sge B etc.), both twin brown dwarfs orbiting each other (ex. PPL 15 AB), either stand alone objects (ex. OTS 44).
Meanwhile I would submit a first draft of several substellar object detected so far, if you wish.

Obviously such a topic should be sticky and placed above "Unconfirmed/Unpublished Exoplanet Catalogue".



Someway we'd keep Whatmough's original subdivision.

Post here you opinion. Smile
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Re: A Brown Dwarf Main Topic

Post by Lazarus on 21st November 2008, 7:02 am

The current way we don't have to start worrying about whether an object is a BD or a planet when we post the discovery.

Does a thread on an m sin i = 11 Jupiter masses object go into the planets or brown dwarfs forum? (The probability that such an object exceeds 13 Jupiter masses is roughly 50%)

What definition do we use for the dividing line? Supposing an object with 20 Jupiter masses but signs of a massive heavy element core is found - does that count as a superplanet or a brown dwarf? What about if a system of >13 Jupiter mass objects is found with a planet-like architecture?
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Re: A Brown Dwarf Main Topic

Post by Edasich on 22nd November 2008, 6:35 am

Well, it was supposed to keep someway Whatmough's original organization.Neutral

However I wait for next votes.
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Re: A Brown Dwarf Main Topic

Post by Edasich on 17th December 2008, 4:10 pm

Excuse me for "necro-posting", but I see fifty-fifty poll result...
So it should still be open...
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Re: A Brown Dwarf Main Topic

Post by Lazarus on 17th December 2008, 4:29 pm

Well since you have proposed this, perhaps you could answer some of the questions I raised about how to deal with the borderline topics.

And here's another one: should the recent HW Virginis detection have been filed under the "planets" category (as planet+superplanet system), the "brown dwarfs" category (as sub-brown dwarf+brown dwarf), or perhaps both categories, or what?
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Re: A Brown Dwarf Main Topic

Post by Edasich on 17th December 2008, 5:51 pm

Touchè. Rolling Eyes

Probably neither astrophysics are able to give a feasible limit for planet-brown dwarf at the moment. Usually the limit is put at 13-15 Jupiter masses.
However I think an object with more than 20 Jupiter masses should lay in "brown dwarf" regime. HW Vir c (or D, whatever) could just be in the middle. HD 162020 b could be a superplanet.

Perhaps.
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