neptune desert

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neptune desert

Post by Stalker on 7th March 2010, 8:43 am

Hi

I read something on this forum about the "desert of Neptune", a range of forbiden mass  if I remember well, between the ice giants and and the gas giants.

I did not succeed in finding information on the forum. I also searched on ARXIV without results.

Have you some information? Did I dream? Thanks for your future help.


Last edited by Stalker on 30th September 2015, 2:33 am; edited 1 time in total
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Re: neptune desert

Post by Edasich on 7th March 2010, 10:08 am

If you type "dessert of Neptune", you're dreaming of a very very big, planet-sized ice cream Laughing

Seriously, probably you'd have read this on some HARPS or some other survey Power Point of PDF presentation, talking about the dearth of Neptune-mass planets.

Nevertheless neither I could say exactly where I read this Question
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Re: neptune desert

Post by Borislav on 7th March 2010, 2:44 pm

I think its correct to call "desert sub-saturns"
http://online.kitp.ucsb.edu/online/exoplanets10/udry/oh/21.jpg

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Re: neptune desert

Post by Stalker on 7th March 2010, 4:17 pm

i dont understand what the graphic mean... there is not realy a desert. There is a hole too for ~10Me...
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Re: neptune desert

Post by Sirius_Alpha on 7th March 2010, 5:12 pm

See that gap around 30-40 Earth-masses? That's the desert. It isn't a very arid desert, but it is predicted to exist by planet forming models.

Remember that the planets discovered through radial velocity only have minimum masses. Some planets that appear to occupy that desert may be much more massive, but with sin(i) << 1, thus with true masses out of the desert. I.e. The desert may in fact be drier than that graphic shows.

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Re: neptune desert

Post by Stalker on 7th March 2010, 5:16 pm

thanks
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Re: neptune desert

Post by Stalker on 7th March 2010, 5:19 pm

what is the exact range of mass?
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Re: neptune desert

Post by Sirius_Alpha on 7th March 2010, 5:30 pm

I doubt it's exact. Just, roughly in that area.

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Re: neptune desert

Post by Borislav on 9th March 2010, 1:29 pm

Sirius_Alpha wrote:See that gap around 30-40 Earth-masses?

Yes, 40-50 Earth-masses. For example, current data Encyclopedias. Red for red dwarf, yellow to yellow dwarf.

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Re: neptune desert

Post by Stalker on 9th March 2010, 1:58 pm

30-50 for red dwarf stars and 40-50 for yellow dwarf? Or 30-50/40-50 for the two but artifact (M>Msin i)?
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Re: neptune desert

Post by Borislav on 9th March 2010, 2:15 pm

Stalker wrote:30-50 for red dwarf stars and 40-50 for yellow dwarf? Or 30-50/40-50 for the two but artifact (M>Msin i)?

I think red dwarfs in general is a special case. They do not know hot jupiters, with only periods, like Gliese 876bc.
So just specify the location of the desert is difficult. Necessary to accumulate statistics. Let's wait for the publication planets HARSP, COROT'a and Kepler'a.

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Re: neptune desert

Post by Borislav on 11th March 2010, 9:53 am

In the distribution of transiting planets (i.e. known true mass) has seen two of the desert - between the super-earths and neptunes, and between neptunes and saturns. But it was too little data for statistics.


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