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  #211 (permalink)  
Old 15-March-2008, 03:48 PM
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Probably should have been here, but needs a crosslink anyway:

Space Exploration topic methane detected in exoplanet's atmosphere

(More direct: NASA news release: Hubble Detects Organic Molecule on an Extrasolar Planet)
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  #212 (permalink)  
Old 16-March-2008, 10:06 PM
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Quote:
Originally Posted by Kullat Nunu View Post
A new transiting planet:
  • HAT-7b: An extremely hot massive planet transiting a bright star in the Kepler field.

The abstract says that the planet's dayside temperature should be about 2700 K. That is hot.
I'm curious, how would such a planet appear?Would it be glowing orange hot even at the nightside with winds of speeds in magnitude of 10 000 km/s?
That's truly a hell planet.Venus is a nice good cool habitable inviting planet compared to this.
One thing that I don't understand is that how that planet can even exist?It is only about 1.776 x as massive as Jupiter so I would expect that the planet's gas envelope would evaporate early in it's life, leaving a*lava ball superterrestrial.Was there any sign of atmospheric evaporation detected.
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  #213 (permalink)  
Old 01-April-2008, 11:30 AM
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Ten new SuperWASP planets (follow this thread).

No much information about the planets is available yet. From the news release:
Quote:
45 planets have now been discovered using the transit method, and since they started operation in 2004 the SuperWASP cameras have found 15 of them – making them by far the most successful discovery instruments in the world. The SuperWASP planets have masses between a middleweight 0.5 and a huge 8.3 times that of Jupiter, the largest planet in our Solar System. A number of these new worlds are quite exotic. For example, a year on WASP-12B (its orbital period) is just 1.1 days. The planet is so close to its star that its daytime temperature could reach a searing 2300 degrees Celsius.
That planet has the shortest-period of confirmed extrasolar planets. However, some of the SWEEPS planet candidates have much shorter orbital periods.
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  #214 (permalink)  
Old 01-April-2008, 11:41 AM
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Let's do some wild extrapolation:

Now a total of 16 new planets have been discovered in 2008 so far. However, only 1/4th of the year has passed. That means if the current rate continues, at the end of the year we should have a total of 64 planets, surpassing the record year 2007.

On the other hand, in the period of 2002-06 the average number of new planets/year was only 30. If the transit method is finally delivering its promise, 60+ planets in this year is what we can realistically expect.

PS. The COROT team is following 100 planet candidates, and discovery papers are being prepared so one can expect news from them sooner or later...
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  #215 (permalink)  
Old 02-April-2008, 09:49 PM
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HL Tau b, a planet less than 2000 years old!?
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  #216 (permalink)  
Old 02-April-2008, 09:53 PM
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Quote:
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No much information about the planets is available yet.
Information on the planets is now on-line.
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  #217 (permalink)  
Old 03-April-2008, 02:33 AM
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Quote:
Originally Posted by Kullat Nunu View Post
If the transit method is finally delivering its promise, 60+ planets in this year is what we can realistically expect.
I'll guess 90, based heavily on wishful thinking.
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  #218 (permalink)  
Old 03-April-2008, 10:31 PM
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One can always hope, but there is a serious limit on the availability of telescope time. Even if the transit method was much more productive than it has turned out to be, the number of new discoveries couldn't be dramatically higher because each discovery must be confirmed by measuring the radial velocities. Large majority of promising candidates turn out to be false positives, unfortunately.
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  #219 (permalink)  
Old 03-April-2008, 10:58 PM
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I was afraid that might be the case. Do you have an idea when we might see a noticeable rate increase?
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  #220 (permalink)  
Old 04-April-2008, 09:36 PM
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What counts as a noticeable increase? We were just given the by far biggest batch of transiting planets so far. Last year we saw a big jump in transiting planet discoveries, and it is not impossible that in this year most planets will be found using the transit method.
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  #221 (permalink)  
Old 04-April-2008, 11:55 PM
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I was thinking about new scopes or new mass surveys coming on-line to assist the search. I don't recall anything coming up in the next several months, but there are some nice spacecraft planned.
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  #222 (permalink)  
Old 06-April-2008, 05:49 AM
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Kullat Nunu,

I love this thread, thanks. How did you come by the "100 planet candidates" figure? Is this more than just a guess on your part?

It is fun to speculate on how many new planets will be discovered/announced in a given year. Each year new planets are discovered and the discoveries that astronomers are sure enough about from previous years are announced. Clearly there will be a time when the number of extrasolar planet discoveries really accelerates and the number of candidates piles near a thousand. That time, as the new SuperWASP results and probable COROT results imply, may not be too far off.
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  #223 (permalink)  
Old 08-April-2008, 10:23 AM
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Quote:
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I love this thread, thanks. How did you come by the "100 planet candidates" figure? Is this more than just a guess on your part?
That figure comes from the spacEurope blog. No idea how secure cases those are. If they're just "planetary like transits", the value will no doubt radically fall.

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Originally Posted by folkhemmet View Post
It is fun to speculate on how many new planets will be discovered/announced in a given year. Each year new planets are discovered and the discoveries that astronomers are sure enough about from previous years are announced. Clearly there will be a time when the number of extrasolar planet discoveries really accelerates and the number of candidates piles near a thousand. That time, as the new SuperWASP results and probable COROT results imply, may not be too far off.
So it was thought. Back in 2005, it was believed that when the planetary transit searches are in full swing (like now...) there should be around 186 detections/month. None of the searches turned out as successful than expected, and interestingly the only ones that have found anything are among the ones using the smallest telescopes.
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  #224 (permalink)  
Old 08-April-2008, 12:26 PM
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Default Corot News ?

I kept in mind ( waiting anxious... ) end of februari as being the time when the new Corot discoveries were anounced to be published by Esa.
We surpassed with one month now.
Has anybody an idea if Esa released a new date for the next releases ?
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  #225 (permalink)  
Old 09-April-2008, 03:18 AM
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Quote:
Originally Posted by frankuitaalst View Post
I kept in mind ( waiting anxious... ) end of februari as being the time when the new Corot discoveries were anounced to be published by Esa.
We surpassed with one month now.
Has anybody an idea if Esa released a new date for the next releases ?
The COROT team has release three papers, describing two planets:

http://arxiv.org/abs/0803.3202
http://arxiv.org/abs/0803.3207
http://arxiv.org/abs/0803.3209

Enjoy.
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  #226 (permalink)  
Old 11-April-2008, 01:15 PM
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There are reports on the discovery of Gliese 436 c, "the smallest planet found so far". Unfortunately and unlike the various news articles suggest, the discovery is still far from certain. It would be great if the planet is confirmed: the previously found planet, Gliese 436 b is a transiting planet which means that any other planets orbit probably very close to edge-on (as a matter of fact, Gliese 436 b is a hot Neptune and only transiting planet of its kind). The inferred minimum mass of ~5 times Earth's would therefore be close to the true value. In addition, if we are exceptionally lucky, we could see transits of the secondary planet!

Even though the existence of the planet is unclear, the eccentric orbit of Gliese 436 b strongly suggests that it is not the only planet in the system. Only time and more radial velocity measurements will tell if the suggested planet really exists.
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Old 19-April-2008, 01:29 PM
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Is this planet smaller than Gliese 581c? It's reported mass was just over 5 as I recall.
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  #228 (permalink)  
Old 19-April-2008, 05:38 PM
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What conditions can be on it?If it has a Venuslike albedo and atmosphere, then it must be melting hot according to this http://www.astro.indiana.edu/~gsimon...perature1.html.
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  #229 (permalink)  
Old 21-April-2008, 11:26 AM
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Alonso et al. report that they are unable to confirm the existence of Gliese 436 c.
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  #230 (permalink)  
Old 26-April-2008, 03:24 PM
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