CoRoT Results

Found the original reference I was thinking of...

http://www.colloquium.eu/congres/09COROT/docs/posters/P-VIII_86_timing_binaries.pdf

Quote :

For CoRoT: if the amplitude of the perturbation is 10s and its period is 70 days, the minimum mass of the third body is 0.23 Jupiter masses (if m_B=0); however, if binary's mass is 1 solar mass then m₃>60 M_J.

For Kepler: if the amplitude of the perturbation is 10s and its period is 150 days, the minimum mass of the third body is 0.1 Jupiter masses (if m_B=0); however, if binary's mass is 1 solar mass then m₃>47 M_J.

Both missions can only detect circumbinary objects of planetary mass around binaries with masses smaller than 0.1 solar masses (stars later than M8).

...

LITE is favored by the presence of massive objects; with the current design of these missions it is difficult to arrive to the region of the parameter space where circumbinary planets can be found.

then now i'm confuse because the two scientific papers are in contradiction with each other

the

[url]

and

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Do you know Lazarus ? anybody know? because now i don't know

far as i know most of the scientific paper that i read i'ts a favour of circumbinary planets detection with such missions like Kepler or Corot,...

but now i don't know....

Eeeew!!! My eyes are bleeding looking at this awful link paste!!

Please, Daniel, edit the post.

Just kidding

i don't know why that happen with my post! sorry Edasich sorry everybody

I fixed your urls =o.

I'm not sure what the contradiction is you speak of. Could you perhaps point it out?

ok Sirius_Alpha, this scientific paper say that kepler and Corot could detect Circumbinary Planets by timing variation

http://www.iac.es/galeria/hdeeg/pubs2002/BioAstro02_submitycorr.pdf

scientist Laurance Doyle he has the responsibilitiy for detection of extrasolar planets around eclipsing binary systems with Kepler

like say here on this site: http://www.seti.org/doyle

however lazarus point out this scientific paper on the forum the kepler and corot couldn't detect such circumbinary planet by timing variations...

see here:

http://www.colloquium.eu/congres/09COROT/docs/posters/P-VIII_86_timing_binaries.pdf

now... it is possible detect such circumbinary planet with Kepler and Corot or not?

Okay, I think I see what's going on.

The detectability of a planet is a factor of many things.

Binary mass -> Higher mass binary = shorter orbital period = lower transit-timing amplitude (and radial velocity amplitude for a single star).

Orbital period -> Greater orbital periods = higher amplitudes, but take longer to detect. CoRoT's observation window is 50 days so if the orbital period >> 50 d, CoRoT probably won't be able to detect the planet simply because it hasn't been observing long enough. Kepler, providing constant observation of one field, will have a better chance of detecting such planets.

Planet mass -> Obviously, the more massive the planet, the greater the transit-timing amplitude will be.

As you see, whether or not CoRoT can detect planets around eclipsing binaries depends on the situation. The example Lazarus gave:

Lazarus wrote:

Assuming total binary mass of 2 solar masses, planet mass of 1 Jupiter mass, orbital period 50 days (to match the length of time CoRoT observes the field) and an edge-on planetary orbit, the light travel time fluctuation has a semi-amplitude of about 80 milliseconds. This is going to be very challenging to detect - I recall seeing a paper which claimed CoRoT could not detect circumbinary planets by eclipse timing because for planets with orbital periods which are comparable to the observation time, the light travel time variation is too small to detect.

This method for detecting planets favours stars of low mass ( = higher transit timing amplitude):

Quote :

For CoRoT: if the amplitude of the perturbation is 10s and its period is 70 days, the minimum mass of the third body is 0.23 Jupiter masses (if mB=0); however, if binary's mass is 1 solar mass then m3>60 MJ.

For Kepler: if the amplitude of the perturbation is 10s and its period is 150 days, the minimum mass of the third body is 0.1 Jupiter masses (if mB=0); however, if binary's mass is 1 solar mass then m3>47 MJ.

As you can see, both spacecraft can make the detection, but only if the binary mass is low. Furthermore, Kepler is in a better position to do so (Due to the extended observation window).

Daniel wrote:

now... it is possible detect such circumbinary planet with Kepler and Corot or not?

To answer your question, as with every other detection method, it depends on the planet, and in this case, the star(s) it revolves around.

thank you Sirius Alpha to explaim the situation ,now i understand

then look like that Kepler go to be better for the job of detect circumbinary planets,so now lets just wait for kepler results,maybe corot too,how knows.

Updated parameters for Corot-6 b:

http://exoplanet.eu/star.php?st=CoRoT-6

Edasich wrote:

Updated parameters for Corot-6 b:

http://exoplanet.eu/star.php?st=CoRoT-6

Transiting exoplanets from the CoRoT space mission IX. CoRoT-6b: a transiting `hot Jupiter' planet in an 8.9d orbit around a low-metallicity star
http://arxiv.org/abs/1001.1426

Abstract wrote:

The CoRoT satellite exoplanetary team announces its sixth transiting planet in this paper. We describe and discuss the satellite observations as well as the complementary ground-based observations - photometric and spectroscopic - carried out to assess the planetary nature of the object and determine its specific physical parameters. The discovery reported here is a `hot Jupiter' planet in an 8.9d orbit, 18 stellar radii, or 0.08 AU, away from its primary star, which is a solar-type star (F9V) with an estimated age of 3.0 Gyr. The planet mass is close to 3 times that of Jupiter. The star has a metallicity of 0.2 dex lower than the Sun, and a relatively high $^7$Li abundance. While thelightcurveindicatesamuchhigherlevelof activity than, e.g., the Sun, there is no sign of activity spectroscopically in e.g., the [Ca ] H&K lines.

the is nothing of news(except Updated parameters) on CoRoT-6b, it's been 3 years and the only impressive news was CoRoT-7b the super-earth size planet

i know that still a lot data for corot exoplanet science team analyzing, but i was expect more for corot.

kepler mission impress me much more,in they first science run

Hi Daniel,

Sirius_Alpha just posted the link for the paper on Corot-6b in the previous post.
There are at least 4 more planets on the way soon : Corot-8b to Corot-11b.

The Corot mission was not designed specifically for the detection of exoplanets, the telescope is far smaller than Kepler's (important for S/N) and the mission does not (or at least did not) have the kind of infra-structure that Kepler has to support ground operations and the follow up of exoplanet candidates.

They also have some tricky problems with data analysis that delayed discoveries further.

It is not easy to do cutting edge science...

Corot-11 b?? Where have you heard this?

There was an article in Ciel & Espace, a french astronomy magazine, about Corot.
In it these 4 new planets were mentioned. No further details though.

Longer orbital period than the typical hot Jupiter, and fairly low metallicity for a HJ system. Hmmmm.

exoplanet wrote:

There are at least 4 more planets on the way soon : Corot-8b to Corot-11b.

exoplanet wrote:

There was an article in Ciel & Espace, a french astronomy magazine, about Corot.
In it these 4 new planets were mentioned. No further details though.

I read that magazine too, and, well, I think it's very speculative. To answer to Edasich, in the introduction of the article, there is the sentence: "Only 11 extrasolar worlds have been detected by the satellite Corot, after 3 years of mission."
Personnaly, I don't know where they found the four other planets. I should send them a letter about this and see what their answer is.
But, apart from that, this is a very interesting article.

Considering how much "top secret" they like to be, I don't think they're gonna answer you something convincing

Quote :

Possibly one more planet (CoRoT-7d?) ~15 times Mearth and 9 days period but confirmation requires 100 – 200 additional observations with HARPS

Stalker wrote:

Quote :

Possibly one more planet (CoRoT-7d?) ~15 times Mearth and 9 days period but confirmation requires 100 – 200 additional observations with HARPS

http://www.astro.ex.ac.uk/esp09/presentations/Bouchy_Monday.pdf

http://sci.esa.int/science-e/www/object/.../object/doc.cfm?fobjectid=46536

Quote :

CoRoT: Malcolm Fridlund
After more than 1100 days in space, CoRoT continues to operate nominally but with only one
half of its initial Field-of-View following the failure of one of the two data processing units. A
newly found exoplanet, CoRoT-9b, is the subject of an article accepted for publication in Nature. Slightly less massive than Jupiter, it has a low eccentricity orbit with a period of 95 days. Given its host star luminosity, the planet surface temperature should be in the range 300 to 500 K. A further four articles on new Neptune-size to Jupiter-size planets have been submitted for publication. Several candidates are awaiting final confirmation wile around 100 further potential exoplanets are being followed-up for photometric and spectroscopic confirmation. About 20 hours of ESA observing time on the OGS 1m telescope in Tenerife is assigned to such follow-up programmes each month. CoRoT exoplanetary candidate host stars are observed at the expected time of the transit as well as out of eclipse. The OGS data are then transmitted to ESTEC for reduction and analysis. This turns out to be an efficient method to screen-out false candidates triggered by a background eclipsing binary in the large CoRoT pixel.

Who knows, how much time passes between the sending and publication of an article in the Nature?

They might be checking it for moons. A planet that far from its star may well have them.

CoRoT-9b just announced:

http://exoplanet.eu/star.php?st=CoRoT-9

DEEG H., MOUTOU C., ERIKSON A., CSIZMADIA Sz., TINGLEY B., BARGE P., BRUNTT H., HAVEL M., AIGRAIN S., ALMENARA J.-M., ALONSO R., AUVERGNE M., BAGLIN A., BARBIERI M., BENZ W., BONOMO A., BORDE P., BOUCHY F., CABRERA J., CARONE L., CARPANO S., CIARDI D., DELEUIL M., DVORAK R., FERRAZ-MELLO S., FRIDLUND M., GANDOLFI D., GAZZANO J.-C., GILLON M., GONDOIN Ph., GUENTHER E., GUILLOT T., Den HARTOG R., HATZES A., HIDAS M., HEBRARD G., JORDA L., KABATH P., LAMMER H., LEGER A., LISTER T., LLEBARIA A., LOVIS Ch. MAYOR M., MAZEH T., OLLIVIER M., PÄTZOLD M., PEPE F., PONT F., QUELOZ D., RABUS M., RAUER H., ROUAN D., SAMUEL B., SCHNEIDER J., SHPORER A., STECKLUM B., STREET R., UDRY S., WEINGRILL J. & WUCHTERL G. , 2010

A transiting giant planet with a temperature between 250 K and 430 K

in Nature , 464 , 484

Gaahh!! You beat me to it by six minutes. I need to step up my attention.

Pretty cool that this is finally official.