Re: Edasich's Work

Edasich · by Edasich on Tue Oct 06, 2009 6:42 am

Sirius_Alpha wrote:How does the pulsar stress the planet's crusts?

Edited. Typos make awful confusion sometimes.

Anyway once Lazarus said these planets might have re-accreted again from previously destroyed planet (If I remember correctly).
Assuming their accretion been quite recent, activity has got to be high.

Sirius_Alpha · by Sirius_Alpha on Tue Oct 06, 2009 8:48 am

I think that the PSR 1257+12 planets re-accreted from the debris from after the supernova, instead of a destroyed planet. I'm not entirely sure a supernova has the power to destroy a planet (assuming it's not a close-in planet).

And by the way, your gas planet textures are stunning.

Lazarus · by Lazarus on Tue Oct 06, 2009 3:19 pm

Edasich wrote:Anyway once Lazarus said these planets might have re-accreted again from previously destroyed planet (If I remember correctly)

I plead not guilty there... (though willing to change my mind if you find the URL

) problem with pre-supernova planets is that the mass loss in a supernova is a very good way of unbinding the system. Likeliest scenario is a supernova fallback disc.

Whether tidal heating would be an issue I don't know... it seems likely that all three planets are in synchronous rotation despite the relatively young age of the system (spindown age ~800 million years) - anyone got any references for a formula for quantifying tidal heating?

Edasich · by Edasich on Tue Oct 06, 2009 4:36 pm

OK, the one and only reason for planets' activity: Y.O.U.T.H!

Sirius_Alpha · by Sirius_Alpha on Tue Oct 06, 2009 8:49 pm

Lazarus wrote:Anyone got any references for a formula for quantifying tidal heating?

I don't recall where I got it though.

The heating flux through the planetary surface can simply be expressed as the tidal heating divided amongst the surface area of the planet.
h = H / 4*pi*R_planet^2

Edasich · by Edasich on Thu Oct 15, 2009 5:39 am

Forgive me for thread bumps, but I reckon this couple of pictures really deserve attention:

38) HD 49674 b: eccentric hot neptune in tight orbit.

39) HAT-P-2 b: eccentric hot super-jovian.

40) HD 43691 b: hot jupiter in eccentric orbit. Here night...

... and here the day side.

42) XO-5 b's eternal dawn.

The F5 type sun bakes the dark world for evermore...

43) And finally, since none (except me) can't know anything about this exoplanet candidate yet, I offer "fan service" for you : 30 Arietis Bb.

I can't anticipate anything, only show you the star is member of a hierarchically triple system (30 Ari Aa-Ab is the bright dot at planet's left) as pointed out back in 2007 (I think) in Santorini Meeting on Extrasolar Planets. If we consider the exoplanet candidate, the system turns out quadruple then.

See you next thread bump

Sirius_Alpha · by Sirius_Alpha on Thu Oct 15, 2009 11:20 am

Water-cloud Jovian in the habitable zone eh? Neat. Laughing

Edasich · by Edasich on Thu Oct 15, 2009 2:55 pm

Consider I had to generate the stellar system by myself. And Celestia stellar temperatures differs a bit from actual ones and modelling stellar radius and spectral types, planet temperatures aren't sometimes entirely correct.
The planet would be actually hotter and more massive.

Edasich · by Edasich on Tue Oct 20, 2009 11:50 am

Thread bump for GJ 667 C needed. Though I prefer call it "MLO 4 C" as at Solstation. They have also updated related page MLO 4

44) - My model for Gliese 667 Cb, super-Earth in tight orbit.:

Sirius_Alpha · by Sirius_Alpha on Tue Oct 20, 2009 12:24 pm

I must have done the math wrong, but the planet I put in to Celestia had a much greater separation from the host star. I calculated a value of 0.051 AU, what's yours?

Edasich · by Edasich on Tue Oct 20, 2009 2:54 pm

Sirius_Alpha wrote:I must have done the math wrong, but the planet I put in to Celestia had a much greater separation from the host star. I calculated a value of 0.051 AU, what's yours?

Same, but an error was hiding in the script files...

Unreasonably the M-dwarf showed "1 Solar radius".

Gosh! It is not a protostar!

Fixed, anyway

And begging your pardon I'm adding Gliese 433.

45) Gliese 433 b, another hot super-earth.

Edasich · by Edasich on Sun Oct 25, 2009 10:50 am

A little thread bump, I was bored

46) LRc01-E2-4295: topic readers are saying "WTH?". Even if I had typed CoRoT 10101123916, impression would have been the same.
So what is this?

According to Planetary transit candidates in CoRoT-LRc01 field it could be a "Corot-7 copycat":

This candidate has a low priority because it is faint, and there are marginal indications of a secondary in the light curve. The target star has an mV = 16.5, and a spectral type according to Exo-Dat of M0V. With a period of 1.13828d and a depth of the eclipse of 0.28% (duration 2.9 h), it could be a similar case to the CoRoT-7b super Earth (Léger et al. 2009). Photometry isplanned for this source in 2009 to discard a CEB scenario.

Hoping it is not a false positive or something else. Let's cross fingers.

47) OGLE-TR-10 and transiting exoplanet "Carystos": now I imagine NuclearVacuum giggling and blushing *lol*.

Serendipitously I've noticed the Lagoon Nebula (M8) painting OGLE-TR-10 exoplanet host firmament. Suggestive, ain't it?

48) HAT-P-11: transiting hot-neptune from HATNET, a Gliese 436 b's kin. Common name? Iphicles !

Sirius_Alpha · by Sirius_Alpha on Sun Oct 25, 2009 10:37 pm

Hints of a secondary transit in the CoRoT candidate would hint that the candidate is of significant brightness compared to the host star. The secondary transits of super-Earths are probably not detectable with CoRoT, or even Kepler.

Edasich · by Edasich on Tue Oct 27, 2009 7:31 pm

It's been Edasich's birthday yesterday, but curiously it's Edasich making presents. This time non-exoplanetary stuff. Had fun with unusual planetary nebulas:

49) Planetary Nebula He 2-138: popped up on October 27 at ArXiv. Central star is very hot O subdwarf.

50) Waterfountain Nebula GLMP 480: randomly picked. Basd on IR reconstruction. Star is likely a dying late-M supergiant.

I hope you like it

Edasich · by Edasich on Tue Nov 03, 2009 7:44 am

Little thread bump. I realized that saving Celestia snapshots as Portable Network Graphics (PNG) files, pictures look much neater than they do in common jpg files. Smile

51) Gliese 676 A and jovian kin "Eumon"

Putting coordinates into stc file for Celestia, you get the binary system being 3.62 light years away from another well-known exoplanet host, Mu Arae. Curious, ain't it?

Btw faint stellar components appear separated 758 AUs away each other. The red dot at planet's left is indeed GJ 676 B, a dim M3 dwarf.

52) Gliese 832 b: Another (cold) jovian around M dwarf.

53) NN Serpentis: WD+dM eclipsing binary...

... and their (putative) substellar/planetary companion

From parameters I've got in a previous paper about this system, I get a total luminosity of 0.044 L_Solar. So water zone should be located nearly at 0.2 AUs.

See you next update Wink