What makes this exoplanet so hot - 2,040 Celsius

[summoner]

Not really sure how this thread got so far off topic, but I really don't see any relevance. Bottom line is that any exoplanet discovered is extremely valuable and the more the better to learn about our universe. <div class="Discussion_UserSignature"> <p> </p><p> </p><p> </p><p> <br /><table cellpadding="0" cellspacing="0" style="width:271px;background-color:#FFF;border:1pxsolid#999"><tr><td colspan="2"><div style="height:35px"><img src="http://banners.wunderground.com/weathersticker/htmlSticker1/language/www/US/MT/Three_Forks.gif" alt="" height="35" width="271" style="border:0px" /></div>

 

[derekmcd]

I fail to see how a stationary orbit would add to the planet's heating. I would think the star would radiate equally around the equatorial band and any variances would be statistically insignificant over time. The planet's proximity to the host star and the incredibly thick atmosphere with very high winds allowing for efficient convection are the likely culprits. The article mentioned the atmosphere is likely metal rich aiding in absorption. <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>

 

[rlb2]

<font color="orange">Intriguing idea. One could postulate dozens of variants along this line of thought<font color="white"><br /><br />I agree it is a little perplexing and does help stretch the imagination into a new direction. They mentioned in the article that there was a host of different hypothesis on how this planet got so hot I wonder if this was one of them???<br /></font></font> <div class="Discussion_UserSignature"> Ron Bennett </div>

 

[rlb2]

<font color="orange">I fail to see how a stationary orbit would add to the planet's heating.<font color="white"><br /><br />The planet being somewhat stationary relative to the stars atmosphere which has enveloped it would mean that there are less frictional forces trying to erode its orbit causing it to crash into the star.<br /><br /><font color="orange">The article mentioned the atmosphere is likely metal rich aiding in absorption.<font color="white"><br /><br />The temperature mentioned is hot enough to liquefy most metals and as mentioned turn some metals like titanium into gaseous form however the boiling point of titanium is (3287 °C, 5949 °F) so this hypothesis mentioned in the article would have to mean that the titanium would be under less than 1 atm pressure to vaporize into a gasses state at the lower exoplanet temperature mentioned (3,700 degrees Fahrenheit - 2,040 degrees Celsius)?</font></font></font></font> <div class="Discussion_UserSignature"> Ron Bennett </div>

 

[derekmcd]

I think they are measuring the 'surface' temp. Due to it's proximity to the star, the upper atmospheric temps might be much, much higher. Possibly several thousand Celsius.<br /><br />And I still don't understand your thought behind it's orbit and temp. <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>

 

[rlb2]

<font color="orange">And I still don't understand your thought behind it's orbit and temp.<font color="white"> <br /> <br /><br />OK lets put it this way if a satellite circling the earth comes in contact with Earths tenuous upper atmosphere it would decelerate and loose orbit causing it to crash back to earth, however if that atmosphere extended out to the geosynchronous orbit location then the atmosphere would be traveling about the same speed as the satellite - this would allow the satellite to stay in orbit a lot longer time while in its atmosphere…</font></font> <div class="Discussion_UserSignature"> Ron Bennett </div>

 

[MeteorWayne]

I still have problems seeing a reason for the atmosphere at that distance to be rotating at the same speed as the "surface". <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[rlb2]

I’m not talking about the surface. In short the atmosphere towards the equator at that distance from the surface would also be in geosynchronous orbit. <div class="Discussion_UserSignature"> Ron Bennett </div>

 

[alokmohan]

Last line I dont understand.

 

[MeteorWayne]

Why? <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[rlb2]

Why not.... <div class="Discussion_UserSignature"> Ron Bennett </div>

 

[MeteorWayne]

I'm being serious here <img src="/images/icons/smile.gif" /><br /><br />I don't see a mechanism that would cause the tenuous atmosphere at 6 million km out to rotate at the same speed as the surface, surface being an unclear concept for a gaseous body anyway. <br /><br /> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[nexium]

The article has some errors, thus low credibility. 2040 Celcius is the temperature of the filliment in an incandecent light bulb, so it is white hot with a hint of yellow and orange, not dull red, nor slightly.<br />How could they determine that the planet is charcoal black? Speculation is my guess.<br />A very thin atmospere can extend millions of miles above the photosphere of a star. Likely this outer atmosphere turns slower than the photosphere turns at the equator, so the planet could orbit at close to the same speed as the nearby steller atmosphere, but that condition would last a few years, perhaps less.<br />Perhaps this is the planet equivelent of a Dyson sphere? Neil

 

[rlb2]

<font color="orange">I don't see a mechanism that would cause the tenuous atmosphere at 6 million km out to rotate at the same speed as the surface<font color="white"><br /><br />In order for this idea as I proposed to work it had to be qualified by a reason to stay in orbit around its host star, the best way to do that was to be in a stationary orbit above its theatrically surface in order to be relative to the gasses that had extended out that far. If the exoplanet wasn't in a stationary orbit relative to the host stars surface then it would lose its orbit and be consumed by the star...<br /><br />Another reason for this exoplanet to be so dark is that it is partially shielded by the stars atmosphere which I would guess to be made mostly of carbon.... <br /><br />Another idea for its darkness is they could also be looking through a cloud of dark material to observe the exoplanet.<br /><br /></font></font> <div class="Discussion_UserSignature"> Ron Bennett </div>

 

[rlb2]

<font color="orange">The article has some errors, thus low credibility.<font color="white"><br /><br />I agree. They have been debating this for years and all they can come up with is that hypothesis?</font></font> <div class="Discussion_UserSignature"> Ron Bennett </div>

 

[saurc]

<blockquote><font class="small">In reply to:</font><hr /><p>How could they determine that the planet is charcoal black? <p><hr /></p></p></blockquote><br /><br />Maybe they meant 'black body' radiation as an analogy, not the actual colour? If it had been white-hot and shining, then we would have seen it as a star I suppose.

 

[3488]

I wonder if this planet has a powerfulf magnetosphere like Jupiter, that accellerates particles into the atmosphere, causing it to heat up!!!!<br /><br />Just a thought.<br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[keermalec]

Well I calculated that the planet's temperature at 0.042 AU from its slightly-more-massive than the sun G0 star should be around 1'500°C. Now I remember that Jupiter emits more energy than it receives from the Sun, because it is slowly contracting and liberating a LOT of energy as it does. So my gues is that this planet is doing the same thing. 1'500 °C comes from its star and 500° more from its contraction... <div class="Discussion_UserSignature"> <p><em>“An error does not become a mistake until you refuse to correct it.” John F. Kennedy</em></p> </div>

 

[nexium]

Plus 500 degrees c from contraction is likely possible. That requires a contraction of what percent per thousand years for a jupiter mass? Radioactive decay should also warm the surface somewhat. Neil