Corot finds gas giant exoworld.

qso1 · May 4, 2007

http://www.space.com/scienceastronomy/070503_corot_planet.html Got one..COROTs first exoworld according to the story which further states an earthlike world could be found and probing of its chemical makeup might even be possible. <div class="Discussion_UserSignature"> My borrowed quote for the time being:There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened. </div>

3488 · May 4, 2007

A very quick discovery. COROT is going to find loads!!!! This planet must almost be a Brown Dwarf. Andrew Brown. <div class="Discussion_UserSignature"> "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". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

qso1 · May 4, 2007

I was thinking just a few days ago that COROT had been launched recently and was wondering how much checkout time would be required before it begins to do actual science. Wasn't long at all. And your right, I can see COROT making many discoveries in the years to come. <div class="Discussion_UserSignature"> My borrowed quote for the time being:There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened. </div>

3488 · May 4, 2007

I can see COROT being the most prolific planet discoverer in history. Perhaps COROT will find planets around some of the nearer, more familiar stars. Also COROT hopefully wil answer many questions such as starspot cycles, resonances, etc of other stars. Andrew Brown. <div class="Discussion_UserSignature"> "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". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.http://www.launchphotography.com/ http://anthmartian.googlepages.com/thisislandearthhttp://web.me.com/meridianijournal </div>

MeteorWayne · May 4, 2007

That is excellent news! <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

deapfreeze · May 4, 2007

This was very quick. I can see several new exo planets in the very near future. <div class="Discussion_UserSignature"> William ( deapfreeze ) Hooperhttp://deapfreeze-amateur-astronomy.tk/ </div>

qso1 · May 7, 2007

3488: Perhaps COROT will find planets around some of the nearer, more familiar stars. Me: I hope so, seems strange that there has been no confirmed exoplanet findings around stars closer than Lalande 21185. Stars such as Alpha Centauri, Tau Ceti, Epsilon Eridani, or Delta Pavonis. Of course, D pav and Epsilon are a bit further off than 21185 but there all relatively close. All within 20 LY. <div class="Discussion_UserSignature"> My borrowed quote for the time being:There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened. </div>

MeteorWayne · May 7, 2007

qso1, Well since there are only 5 known stars closer than Lalande 21185 (8.3 LY), including the Sun, and the 3 star Centauri system, that's not too surprising <img src="/images/icons/smile.gif" /> (The other two closer are Barnard's star at 5.6 LY and Wolf 359 (CN Leonis) at 7.8 LY. These and Lalande 21185 are Red Dwarves. I'm Sirius! (which by the way, is next after Lalande at 8.6 LY) MW <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

qso1 · May 8, 2007

And Siriusly speeking...your right, I guess now its time to ask how many stars have been looked at overall to determine how many stars have yet to have a planet discovered around them. You don't know by chance how many stars have turned out not to have planets so far. <div class="Discussion_UserSignature"> My borrowed quote for the time being:There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened. </div>

robnissen · May 8, 2007

I am quite certain that all close stars (at least to 50 ly) have been looked at. But that doesn't begin to answer the question. All that states, is how many stars have hot jupitors. It is my belief that we currently do not have the technology to detect our solar system in any other star system, i.e. with small earth size worlds close, and jupiter sized planets at the jupiter distance from the sun. I believe the only exception is we might be able to detect a jupiter mass planet at a jupiter distance at one of the triple stars in Alpha Centauri, but only if we got incredibly lucky and happened to be in the same plane to use the transit method. I believe that we can only use the transit method on about 1% of stars. Also, I am not sure there is a stable orbit in the Alpha Centauri system at about Jupiter's current location.

qso1 · May 8, 2007

Good points and your right, it does not begin to answer the question. Our tech will have to take a few more critical steps before some answers will become available. I dealt with it sort of in my graphic novel series by suggesting the Alpha Centauri system does not have gas giants on the scale of anything beyond Neptune sized and probably none in Jupiter like orbits. Earthlike worlds as near to the "A" star as we are to the sun are probably still beyond current detection methods. And as you mentioned about orbital planes, the alpha centauri system is tilted towards us to where were looking at the orbital plane almost edge on which favors transits but it may not be edge on enough to favor transits enough. <div class="Discussion_UserSignature"> My borrowed quote for the time being:There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened. </div>

h2ouniverse · May 8, 2007

Dear all, The Corot team announced performances far beyond expectation. That is to the credit of CNES and scientists, and of our teams in Cannes who built the telescope and the spacecraft, with an outstanding pointing accuracy. You may know that the mission team even thinks about detecting the star's light reflected on planets. Given the modest 270mm diameter of the instrument, this is remarkable. Regards Joel. http://www.cnes.fr/web/5891-corot-decouvre-sa-premiere-exoplanete-.php

MeteorWayne · May 8, 2007

You are most likely correct about that. Since in our solar system, the sun's reflex action is produced by: Jupiter 49%, Period 11.9 Yr Saturn 27%, P=29.7 Y Uranus 8%, P=83 Y Neptune 15% P=164 Y All the other stuff combined is less than 1% In the amount of time we have been conducting radial velocity searches just over 1 Jupiter cycle will have been completed, such a system might be suspected, but not confirmable. Even for a transit, you would only have a small chance of having detected Jupiter (with no second pass for confirmation) even if someone was lucky enough to beat the />1 in 50 odds of proper alighnment. BTW, the Canadian MOST (Microvariability and Oscillation of STars) space telescope was scheduled to look for a potential transit of Gliese 581c yesterday. Keep an eye out for headlines, but the researchers calculated the 1 in 50 odds of proper alignment I mentioned above. <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

h2ouniverse · May 8, 2007

Hi Meteorwayne, The Corot team hopes to detect the star's light reflected on planets. That would theoretically open the way for detection of non-transiting planets since the phases should induce a variation of both total flux and spectral signature. May be that will occur with Corot for total flux, or may be with bigger instruments and spectro, but that is an exciting perspective... Probably they will try first on planets discovered by transit or radial velocity. The signal variation is likely to be so dim and with a so long time constant that they will probably not claim a discovery based on that info alone.

robnissen · May 8, 2007

Interesting post and welcome to SDC. It would be truly remarkable and awesome if Corot could detect reflected light off of planets. Too bad I can't read French. <img src="/images/icons/smile.gif" />

MeteorWayne · May 8, 2007

Thanx for the post, and welcome, By The Way. <img src="/images/icons/smile.gif" /> I still think that with Gliese 581c in a 13 day orbit (?) it's awfully close to the star, but I admit I have not looked at the detailed capabilities. <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

h2ouniverse · May 8, 2007

Dear all, Thank you for your welcome and, oops, Sorry for the link! I thought there was an English version but... So here is the ESA link. (more or less the translation of the CNES page). The light curve looks particularly clean for this hot Jupiter, at 1500 LY: my COROT colleagues are understandably quite proud of it! Regards. http://www.esa.int/esaCP/SEMCKNU681F_index_0.html See too this link (in english) to CNES, with the pictures taken in our clean rooms in Cannes: the achievements relatively to the small size of the satellite are also encouraging for future missions (the platform at bottom of satellite -between telescope and launcher interface- is the Proteus platform, a 1m cube; the telescope aperture is just 270mm). http://smsc.cnes.fr/COROT/GP_satellite.htm

h2ouniverse · May 8, 2007

MeteorWayne, Apparently they hope to reach between 1e-6 and 1e-5 of accuracy. That would marginally detect the light from a Gliese 581b (assuming 40000km diameter at 0.041 AU), but not from a Gliese 581c. Assuming 18000 km diameter at 0.072 AU, that would mean if I am correct about 1e-7. To be compared with the mere 1e-3 required to detect a Gliese 581c in front of Gliese 581 by transit method.

MeteorWayne · May 8, 2007

Am I to assume from this post you are on the Corot team? It would be wonderful to have a view from the inside. If you've stated that before, I apologize for missing it. Thanx again for your insights! Wayne <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

h2ouniverse · May 9, 2007

MeteorWayne, Unfortunately I have not been involved in the Corot programme although I would have really liked to. But I am working in the same directorate and same site so I know some of the people who designed the spacecraft and the telescope (on industry side). Sorry for expressing a misleading pride that is collective, not personal. Regards.

MeteorWayne · May 9, 2007

That's OK, it wasn't really misleading. Any insight you can glean from those you speak to will be much appreciated here. <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

robnissen · May 9, 2007

Sorry for expressing a misleading pride that is collective, not personal. Don't be sorry, I have pride in Corot from being a member of the species that can carry out such a mission. <img src="/images/icons/smile.gif" /> You are certainly entitled to have a strong sense of pride in your co-workers' accomplishments.

MeteorWayne · May 9, 2007

Heck I have a strong sense of pride in what I learn and share here at SDC <img src="/images/icons/smile.gif" /> <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

qso1 · May 10, 2007

H2Ouniverse: You may know that the mission team even thinks about detecting the star's light reflected on planets. Me: And thats why COROT is under my microscope. That is to say, my primary interest is earthlike worlds and this project may yet be the first to image an earthlike world although I would expect no more than a few pixels at best. <div class="Discussion_UserSignature"> My borrowed quote for the time being:There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened. </div>

h2ouniverse · May 10, 2007

Sorry qso, I am afraid you will have to wait for large interferometers such as TPF or Darwin to get a one-pixelled image. May be JWST if they equip it with a coronagraph. And next generation for more. CoRoT measures lightcurves. A planet appears primarily if it transits, as a dip in overall lightcurve. The sensitivity is so good that they expect to detect Earth-sized planets. And to detect/analyse the light reflected by large planets. But not by resolving the planet (optically), "just" by differentiating total light received from the average flux. (see light curve beneath to visualize how the planet manifests itself). The depth of the dips gives the ratio between squared diameters of planet vs star, and characteristics of star provide for assessment of star diameter. Distance to star is inferred from assessment of star's mass and from planet's orbital period. May be if the resolution is really really good (and with post-processing), CoRoT might detect a Mars-sized exomoon orbiting a large giant (double dip). Best regards.

Corot finds gas giant exoworld.

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