Search for brown dwarfs: true masses of some planet candidates

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Search for brown dwarfs: true masses of some planet candidates

Post by Lazarus on 4th October 2010, 7:47 am

Search for brown dwarf companions of stars

Notably the true mass of the planet candidate HD 190228b is 65.7 Jupiter masses (i=4.3 degrees), while HD 43848b comes out at over 100 Jupiter masses, so it is a star.

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Edasich on 4th October 2010, 7:59 am

Similar works have been submitted, but EPE seems ignoring them.

HD 43848 b is still listed at EPE as planet/brown dwarf, as well as SCR J1845-6357 B.

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Lazarus on 5th October 2010, 7:57 am

HD 190228b has been dropped into the "unconfirmed" section.

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Edasich on 5th October 2010, 2:07 pm

Lazarus wrote:HD 190228b has been dropped into the "unconfirmed" section.

No

At least HD 43848 has also moved in same section.

SCR 1845 is yet an intruder... What a Face Laughing

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Sirius_Alpha on 5th October 2010, 2:19 pm

SCR 1845 b, was it disproven?

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Edasich on 5th October 2010, 2:38 pm

Sirius_Alpha wrote:SCR 1845 b, was it disproven?

It is a brown dwarf companion (45-65 Mj) not a 8 Mj planet. I don't get why EPE keeps listing it between "candidates detected by imaging".

On the other hand Ross 458 C (DT Virginis C) seems to be confirmed as 6 Mj planet at 1.160 AUs. But doesn't appear.

Since as I speak things seem to happen...who knows? Laughing

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Sirius_Alpha on 5th October 2010, 3:50 pm

Do you have a reference for the mass of SCR 1845 B?

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Lazarus on 5th October 2010, 4:13 pm

There are a fair few objects which seem to meet the inclusion criteria for EPE which aren't there. Taking this paper as a reference, it seems that DH Tau B, Oph 1622a and b, CHXR 73b, HD 203030b, FU Tau B and EK 60 B should all be listed on EPE. On the other hand, these objects may be better regarded as very low mass brown dwarfs.

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Edasich on 6th October 2010, 7:37 am

Lazarus wrote:There are a fair few objects which seem to meet the inclusion criteria for EPE which aren't there. Taking this paper as a reference, it seems that DH Tau B, Oph 1622a and b, CHXR 73b, HD 203030b, FU Tau B and EK 60 B should all be listed on EPE. On the other hand, these objects may be better regarded as very low mass brown dwarfs.

Low mass BDs - HD 203030 b, Oph 1622 a and d, FU Tau B.

True superplanets - CHXR 73b, EK 60 b (yet unpublished!), Ross 458 C (6 Mj!!) and DH Tau B.

Update, Schneider! Razz

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Sirius_Alpha on 6th October 2010, 1:52 pm

You can e-mail him about it if you want lol.

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Edasich on 6th October 2010, 3:29 pm

Sirius_Alpha wrote:You can e-mail him about it if you want lol.

I did it time ago. No answer Razz
I'm serious. Rolling Eyes

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Sirius_Alpha on 19th October 2010, 9:57 am

It's now in the unconfirmed category.
http://exoplanet.eu/planet.php?p1=SCR+1845&p2=b

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Edasich on 19th October 2010, 2:18 pm

Sirius_Alpha wrote:It's now in the unconfirmed category.
http://exoplanet.eu/planet.php?p1=SCR+1845&p2=b

So everything gets clearer. Though Corot-3 b's presence is still controverse.

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Lazarus on 19th October 2010, 2:42 pm

Well CoRoT-3b has a mass below the brown dwarf desert, so planetary nature is a definite possibility. (Still seems to be some uncertainty as to how much of a heavy element core it has though...)

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Re: Search for brown dwarfs: true masses of some planet candidates

Post by Edasich on 19th October 2010, 3:27 pm

Lazarus wrote:Well CoRoT-3b has a mass below the brown dwarf desert, so planetary nature is a definite possibility. (Still seems to be some uncertainty as to how much of a heavy element core it has though...)

Oh so? I thought 11-13 Mj were the "thresold" between planets and brown dwarfs, even accounting stellar host's metallicity.

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