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Old 18-December-2008, 11:47 PM
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WASP-12b: the hottest transiting extra-solar planet yet discovered have discovered a very very hot Jupiter with a 1.09 day period orbiting an F9 star. They claim it is the most heavily irradiated planet known with an equilibrium surface temperature (inferred) of 2516K. They also say WASP-12b has the largest radius of any transiting planet yet detected, 1.79 RJ.
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Old 25-December-2008, 07:20 PM
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Another record, great However, not one of those records getting us closer to finding Earth2, but still a record...
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Old 06-January-2009, 09:29 PM
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After a lean period while astronomers waxed fat, another record: HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field describes the smallest radius transiting extrasolar planet found so far, radius 4.73±0.16 R⊕. Mp = 25.8±2.9 M⊕, P = 4.9 days, e = 0.198±0.046. This planet would be very hot.
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Old 06-January-2009, 10:45 PM
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WASP-12b: the hottest transiting extra-solar planet yet discovered have discovered a very very hot Jupiter with a 1.09 day period orbiting an F9 star. They claim it is the most heavily irradiated planet known with an equilibrium surface temperature (inferred) of 2516K. They also say WASP-12b has the largest radius of any transiting planet yet detected, 1.79 RJ.
Wow, that one's going to make big splash when it augers into its Fine host.
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Old 07-January-2009, 04:13 AM
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Another record

And how great. When it looked as if 2007 would beat 2008's planet count we just suceeded and reached 62 new exoplanets for the second year in a row.
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Old 13-January-2009, 02:41 AM
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Hot Jupiter discovered around magnitude 0.4 G8 giant. This is the first planet to be discovered by a Chinese-Japanese co-op.
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Old 13-January-2009, 03:57 PM
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WASP-12b: the hottest transiting extra-solar planet yet discovered have discovered a very very hot Jupiter with a 1.09 day period orbiting an F9 star. They claim it is the most heavily irradiated planet known with an equilibrium surface temperature (inferred) of 2516K. They also say WASP-12b has the largest radius of any transiting planet yet detected, 1.79 RJ.
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Wow, that one's going to make big splash when it augers into its Fine host.
How can it be calculated?
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Dont say its Fake cos I Have Seen it on TV.

Cos no One can Say its a Reflection off Clouds etc Like we See on Earth.
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Old 19-January-2009, 04:53 PM
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How can it be calculated?
I don't know that it's ever been done, which is part of the humor behind the statement.

Just guessing, but being that close to that bright of a star has got to be putting it into a decaying orbit. The stellar winds alone should create some drag. If so, astronomers should be able to monitor the orbital period and determine a splash date. The closest similar observation of such an event was Shoemaker-Levy as it burst into Jupiter's atmosphere.

The impact of this planet onto the star would a be colossal one and the star would likely flash very, very brightly. V838 Mon may have been one such star that flashed for this reason, at least that is one hypothesis.
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Old 20-January-2009, 01:34 AM
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After a lean period while astronomers waxed fat, another record: HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field describes the smallest radius transiting extrasolar planet found so far, radius 4.73±0.16 R⊕. Mp = 25.8±2.9 M⊕, P = 4.9 days, e = 0.198±0.046. This planet would be very hot.
Why is this classified as the smallest radius extrasolar planet?

We've discovered several 1.5-10 Earth mass planets around main sequence stars, I'd assume those terrestrials would have a far smaller radius than a Neptune class planet.

Also there were terrestrials that weere even smaller than Earth mass discovered orbiting pulsars, those must have a far smaller radius than this super-Neptune.
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Old 20-January-2009, 01:46 AM
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Why is this classified as the smallest radius extrasolar planet?
Don't forget the use of the word "transiting". There are now still only 55 exoplanets found by this technique.
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  #461 (permalink)  
Old 20-January-2009, 01:50 AM
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Don't forget the use of the word "transiting". There are now still only 55 exoplanets found by this technique.
Ah.
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Old 22-January-2009, 03:18 PM
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Regarding the recent "Super-Neptune" discovery:

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have discovered a planet somewhat larger and more massive than Neptune orbiting a star 120 light-years from Earth.

While Neptune has a diameter 3.8 times that of Earth and a mass 17 times Earth's, the new world (named HAT-P-11b) is 4.7 times the size of Earth and has 25 Earth masses.
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The newfound world orbits very close to its star, revolving once every 4.88 days. As a result, it is baked to a temperature of around 1100 degrees F. The star itself is about three-fourths the size of our Sun and somewhat cooler.
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There are signs of a second planet in the HAT-P-11 system
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HAT-P-11 is in the constellation Cygnus, which puts in it the field of view of NASA's upcoming Kepler spacecraft. Kepler will search for extrasolar planets using the same transit technique pioneered by ground-based telescopes. This mission potentially could detect the first Earth-like world orbiting a distant star.
{I thought we'd already discovered the 1st Earth-like world orbiting a distant star??}

http://www.spaceref.com/news/viewpr.html?pid=27404
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Old 22-January-2009, 04:38 PM
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Regarding the recent "Super-Neptune" discovery:









{I thought we'd already discovered the 1st Earth-like world orbiting a distant star??}

http://www.spaceref.com/news/viewpr.html?pid=27404
Those were the Super-Earths, not anything 5< Earth masses.
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  #464 (permalink)  
Old 22-January-2009, 08:34 PM
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Actually the Extrasolar Planets Encyclopedia shows five planets that are lower than 5 Earth masses.

Of course, three of these are pulsar planets, but the other two I'd consider genuine terrestrials, mass-wise:

http://exoplanet.eu/planet.php?p1=MO...BLG-192-L&p2=b
http://exoplanet.eu/planet.php?p1=HD+40307&p2=b

But anyway your basic point is correct, we have not discovered any Earth-like planets.

A lot of people I've noticed have a tendency to confuse "Earth-like" and "Earth-sized" - makes a big difference.

Even when we discover the first planet with a mass equal to Earth's, it will still not be an "Earth-like" planet, any more than Venus, which is approximately equal to Earth mass, can remotely be considered "Earthlike."
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Old 24-January-2009, 01:15 PM
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Demonstrating that a planet is Earth-like would require far more sensitive instruments than planet finders use currently because you would have to constrain the composition as well as the mass and size of a body which is currently below the threshold of detection. Of course just a minimum mass of ~5 and an irradiation 20% greater than Venus' for Gliese 581c was enough to provoke media reports that Earth's "twin" had been found, and spawn hundreds of posts here about its likely oceans, biosphere, plans for missions and colonies etc, so I expect numerous more such outbreaks of mass, uh, optimism before the real thing is found.
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Old 28-January-2009, 05:26 AM
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HAT-P-11 is in the constellation Cygnus, which puts in it the field of view of NASA's upcoming Kepler spacecraft. Kepler will search for extrasolar planets using the same transit technique pioneered by ground-based telescopes. This mission potentially could detect the first Earth-like world orbiting a distant star.
You quoted this statement. From what i read, whoever wrote this expects this second planet to be something interesting, or he's just overjoyed about every exoplanet found in the universe (is it you, Timb, who quoted this? ). What is all the fuss with this? Are there any indications that this would not be a M_jup=3,5 orbiting 6AU from the parent star or something along those lines?
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  #467 (permalink)  
Old 28-January-2009, 12:31 PM
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You quoted this statement. From what i read, whoever wrote this expects this second planet to be something interesting, or he's just overjoyed about every exoplanet found in the universe (is it you, Timb, who quoted this? ). What is all the fuss with this? Are there any indications that this would not be a M_jup=3,5 orbiting 6AU from the parent star or something along those lines?
Transit timing variations could be used to detect quite small planets, ie of about Earth mass. I don't think there's any reason to expect a small planet in the HAT-P-11 system though. The page Buttercup was quoting seems to be based on HAT-P-11b: A SUPER-NEPTUNE PLANET TRANSITING A BRIGHT K STAR IN THE KEPLER FIELD, which just reports that another planet is already suspected.
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Old 29-January-2009, 01:53 PM
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HD 7924 b, another super-Earth.
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Old 30-January-2009, 11:20 PM
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HD 7924 b, another super-Earth.
AKA hot Neptune. WASP-6b, an inflated sub-Jupiter mass planet transiting a solar-type star.
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Old 04-February-2009, 06:38 AM
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COROT-Exo-7b, smallest radius planet (1.75 RE seems to be the radius du jour) is discussed elsewhere.

HD45364 has two sub-Jovians in unusually close orbits (0.68 AU and 0.9 AU). A paper by Correia et al. shows that stability is maintained by a 3:2 resonance between the planets.
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Old 04-February-2009, 10:28 AM
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HD 45364, a system of two warm Jupiters in 3:2 mean motion resonance.
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Old 05-February-2009, 04:50 AM
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HD45364 has two sub-Jovians in unusually close orbits (0.68 AU and 0.9 AU). A paper by Correia et al. shows that stability is maintained by a 3:2 resonance between the planets.


Why stop at one paper? Now the same authors have published HD60532, a planetary system in a 3:1 mean motion resonance
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Old 05-February-2009, 11:57 AM
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Is this the first resonance of planets yet found (i mean, we have two moons in the solar system, but no planets)?
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Old 05-February-2009, 03:31 PM
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Is this the first resonance of planets yet found (i mean, we have two moons in the solar system, but no planets)?
Gilese 876b and 876c are also in a 1:2 resonance. I would assume most are in an orbital rsonance, not unlike our planets in the Solar system.
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Old 05-February-2009, 10:51 PM
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Based on what...?
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Old 05-February-2009, 10:53 PM
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COROT-Exo-7b, smallest radius planet (1.75 RE seems to be the radius du jour) is discussed elsewhere.

HD45364 has two sub-Jovians in unusually close orbits (0.68 AU and 0.9 AU). A paper by Correia et al. shows that stability is maintained by a 3:2 resonance between the planets.
First link is 404 because of extra HTTP and .com.
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Old 05-February-2009, 10:54 PM
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Gilese 876b and 876c are also in a 1:2 resonance. I would assume most are in an orbital rsonance, not unlike our planets in the Solar system.
AFAIK the only two planets in the Solar system in mean motion resonance are Neptune and Pluto, and one of those isn't even a planet.

Many exoplanets are suspected of being in MMR, but not that many are regarded as proved. HD82943 and HD73526 are another couple of systems known to have resonances.
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Old 09-February-2009, 10:28 PM
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AFAIK the only two planets in the Solar system in mean motion resonance are Neptune and Pluto, and one of those isn't even a planet.
Oops, you're right. I had the near resonance ratios on my mind. Thanks for the correction.
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Old 10-February-2009, 06:28 PM
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But how do you assume that most exoplanets are in a resonance?

BTW: Two of Saturn's moons are in a resonance, sort of, switching place now and then.
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Old 11-February-2009, 07:57 PM
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You mean Epimetheus and Janus. Mimas and Tethys are in 4:2 resonance, Enceladus and Dione in 2:1 resonance, and Titan and Hyperion are in 4:3 resonance. And of course, Jupiter's moons Io, Europa, and Ganymede are 4:2:1 resonance.

Many multi-planet extrasolar systems found so far orbit quite close their stars (not counting systems with hot Jupiters), so resonant systems should be expected.
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