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Thread: HD 209458 b

  1. #1 HD 209458 b 
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    I was reading on wikipedia that they have found water vapour on this planet HD 209458 b which lies in the Constallation Pegasus.

    http://en.wikipedia.org/wiki/HD_209458_b

    Could i or you expect that with our advances in technology more discoveries similar to this will occur with planets that are closer?
    Its kind of exciting lol

    anyways i have a question here is what wikipedia said

    The radius of the planet's orbit is 7 million kilometers, ~0.047 astronomical units, one eighth the radius of Mercury's orbit. This small radius results in a year that is 3.5 Earth days long and an estimated surface temperature of about 1000 degrees Celsius or around 1800 degrees Fahrenheit. Its mass is 220 times that of Earth's (0.69 Jupiter masses), which indicates that it is probably a gas giant.
    how could an object so large have water vapour on it? wouldnt the water on the planet break down to hydrogen and oxygen under the huge amounts of pressure and temperature?


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    • #2  
      Forum Professor river_rat's Avatar
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      Hi johnny

      Firstly water is hydrogen and oxygen, there is no carbon for it to break up into. Secondly, water is remarkably stable - so it has no real problem at such high temperatures and pressures.


      As is often the case with technical subjects we are presented with an unfortunate choice: an explanation that is accurate but incomprehensible, or comprehensible but wrong.
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    • #3  
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      holy shiat ooops i never noticed such a stupid mistake, i dont know how carbon got in that, that deserves a kick in the head. Sometimes i just write and you know im only human

      Anyways so water can still be around on a planet that has surface temperatures of about 1000 degrees Celsius in the atmosphere and it will just stay there till the planet cools down or something when it can just rain back down? Im not familair with astromony lol
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      Forum Professor leohopkins's Avatar
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      Yes it will just stay there. That is due to the planet's mass. If it were Earth size, im sure the vapour would have left it a long time ago.
      The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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    • #5  
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      I don't think the temperature and pressure would be high in the planet's upper atmosphere.
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      Forum Professor leohopkins's Avatar
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      think again. This planet is VERY close to its star.
      The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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      i was reading something about gas giants on wikipedia and it says that the extreme pressures and temperatures in the interior of jupiter for example make hydrogen metallic (liquid) or something.

      if this planet has water vapour and is .69% the mass of Jupiter what kind of core do you think there would be? Could it be ice or something?
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      Forum Senior anand_kapadia's Avatar
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      Might be because of high pressure it remains in the same form just as the innercore(having high pressure) of the earth is solid whereas the outer core(having less pressure) is liqiud because of pressure difference.

      Else, also on mars water varpours have been found and there is strong evidence of presence or extinction of blue-gree algae.
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    • #9  
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      im just asking thw wrong questions and actually stupoid ones the answers where in front of me but when i read the article i rushed through it, oh well

      Anyways if it has water on it and has a very hot surface, and has sodium in the atmosphere so says wikipedia, what kind of elements would make up the core?
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