CoRoT Results

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Re: CoRoT Results

Post by Sirius_Alpha on 5th February 2009, 9:58 am

Lazarus wrote:According to the latest comment on the oklo.org post about this, there are apparently hints of an additional Neptune-mass planet with a period 4 times that of the super-Earth.

That must be the CoRoT-Exo-7c that was in the EPE before it was taken off. I'll bet you were right, about it supposed to mean 30 M_e instead of M_j.

Exoplanet, water might be in the interior as well as any atmosphere (or ...former atmosphere if indeed it has blown away).

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Re: CoRoT Results

Post by Lazarus on 5th February 2009, 5:06 pm

Hmmmm... problem with that idea is that 4×0.85 days is not 8.6 days.

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Re: CoRoT Results

Post by Edasich on 8th February 2009, 12:45 pm

Have fun with this tiny GIF about Corot-exo-7b... Wink


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Re: CoRoT Results

Post by Sirius_Alpha on 8th February 2009, 7:03 pm

Lazarus wrote:Hmmmm... problem with that idea is that 4×0.85 days is not 8.6 days.

WHAT? I refuse to accept this.

More seriously, yeah I didn't think about that. Then... perhaps the 8.6 day planet was indeed supposed to be CoRoT-Exo-6b, and it's just a coincidence that it's supposed 30 M_j mass could be thought as mistaken, and that it refers to a Neptune at CoRoT-Exo-7.

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Re: CoRoT Results

Post by Edasich on 10th February 2009, 8:48 am

Corot-exo-6 b, some hints. No mass provided so far.

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

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Re: CoRoT Results

Post by Sirius_Alpha on 22nd February 2009, 9:17 pm

Near the end of this paper, evidence for a second object at CoRoT-Exo-1 is presented from an RV drift. Far too unconstrained to really tell what it is.

Radial velocity follow-up for confirmation and characterization of transiting exoplanets
http://arxiv.org/abs/0902.3520

Abstract wrote:Radial Velocity follow-up is essential to establish or exclude the planetary nature of a transiting companion as well as to accurately determine its mass. Here we present some elements of an efficient Doppler follow-up strategy, based on high-resolution spectroscopy, devoted to the characterization of transiting candidates. Some aspects and results of the radial velocity follow-up of the CoRoT space mission are presented in order to illustrate the strategy used to deal with the zoo of transiting candidates.

Just for fun, here's an updated table.
StarPlanetMassP (d)Radiusa (AU)
CoRoT-Exo-1b1.03 J 1.5089557 d 1.49 J0.0254
c?
CoRoT-Exo-2b3.31 J 1.7429964 d1.465 J0.0281
CoRoT-Exo-3b21.66 J 4.2568 d1.008 J0.052
CoRoT-Exo-4b0.72 J 9.20205 d 1.19 J0.09
CoRoT-Exo-5b0.67 J 4.03 d 1.2 J?
CoRoT-Exo-6b? 8.89 d 1.16 J?
CoRoT-Exo-7b0.035 J 0.8535 d0.157 J0.017
c?

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Re: CoRoT Results

Post by Lazarus on 10th March 2009, 3:11 pm

The CoRoT planets have been renamed to drop the "Exo-", so we now have CoRoT-1b, etc.

Mailing list posting

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Re: CoRoT Results

Post by Sirius_Alpha on 10th March 2009, 3:59 pm

Well that's pretty nifty. Makes things a little easier.

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Re: CoRoT Results

Post by Sirius_Alpha on 11th March 2009, 8:09 pm

An analysis of the transit times of CoRoT-Exo-1b
http://arxiv.org/abs/0903.1845

Abstract wrote:I report the results from a study of the transit times for CoRoT-Exo-1b, which was one of the first planets discovered by the CoRoT satellite. Analysis of the pipeline reduced CoRoT light curve yields a new determination of the physical and orbital parameters of planet and star, along with 35 individual transit times at a typical precision of 36 s. I estimate a planet-to-star radii ratio of 0.1433 +/- 0.0010, a ratio of the planet's orbital semimajor axis to the host star radius of 4.751 +/- 0.045, and an orbital inclination for the planet of 83.88 +/- 0.29 deg. The observed transit times are consistent with CoRoT-Exo-1b having a constant period and there is no evidence of an additional planet in the system. I use the observed constancy of the transit times to set limits on the mass of a hypothetical additional planet in a nearby, stable orbit. I ascertain that the most stringent limits can be placed on planets residing in or near low-order mean motion resonances with the transiting planet. For example, masses greater than 1 M_Earth and 0.3 M_Jup are ruled out for planets in or near the 2:1 and 3:1 outer mean motion resonances respectively. In addition, I simulate what limits to additional planets could be obtained from analysis of data for a similar system obtained during a CoRoT long run (100 sequential transit times). I find that for this scenario, planets with masses greater than that of Mars (0.1 M_Earth) in the 2:1 outer mean motion resonance would cause high-significance transit time deviations. Therefore, such planets could be detected or ruled out using CoRoT long run data. I conclude that CoRoT data will indeed be very useful for searching for additional planets to discovered transiting planets with the transit timing method. (Abridged)

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Re: CoRoT Results

Post by Sirius_Alpha on 30th March 2009, 6:20 pm

http://beyondthecradle.wordpress.com/2009/03/30/corot-update-with-malcolm-fridlund/#more-373
CoRoT has lost one of its detector chains...the spacecraft saw its field-of-view decreased to half...considerable reducing of potential obseved planets to 50% of the previous capability.

On the upside,
...the team is still working on CoRoT-Exo-7b, which is presented, here by the project scientist, as a rocky planet. The first paper is already with the referees and the second and third in the process of writing at the moment.

And back to the downside
[The Corot Team] clearly expected to find more exoplanets by now... They even postulated that there might be a problem with the methods of detection.

Perhaps short period planets are much more infrequent than what RV surveys led us to believe?

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Re: CoRoT Results

Post by Lazarus on 30th March 2009, 6:46 pm

There will be 70 CoRoT papers in a separate issue of A&A soon with over thirty more for later issues.
I guess that is going to be the proceedings of the Symposium, which it has been stated will be published in a special issue of A&A.

We will not have classical proceedings for this symposium. Instead, a special feature of the European Journal Astronomy & Astrophysics will be devoted to CoRoT results. The guest editors of this special feature are Annie Baglin, Tristan Guillot and Conny Aerts.

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Re: CoRoT Results

Post by Sirius_Alpha on 8th April 2009, 8:07 pm

Optical detection of CoRoT-1b phase curve!

The changing phases of extrasolar planet CoRoT-1b
http://arxiv.org/abs/0904.1208

Abstract wrote:Hot Jupiters are a class of extrasolar planet that orbit their parent stars at very short distances. Due to their close proximity, they are expected to be tidally locked, which can lead to a large temperature difference between their day and nightsides. Infrared observations of eclipsing systems have yielded dayside temperatures for a number of transiting planets. Furthermore the day-night contrast of the transiting extrasolar planet HD 189733b was mapped using infrared observations. It is expected that the contrast between the dayside and nightside of hot Jupiters is much higher at visual wavelengths as we move shortward of the peak emission, and could be further enhanced by reflected stellar light. Here we report on the analysis of optical photometric data of the transiting hot Jupiter CoRoT-1b, which cover 36 planetary orbits. The nightside hemisphere of the planet is consistent with being entirely black, with the dayside flux dominating the optical phase curve. This means that at optical wavelengths the planet's phase variation is just as we see it for the interior planets in our own solar system. The data allow only for a small fraction of reflected light, corresponding to a geometric albedo <0.20.

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Re: CoRoT Results

Post by Lazarus on 9th April 2009, 3:51 pm

COROT-7b may well be a chthonian planet.

Observational Evidence for Tidal Destruction of Exoplanets

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Re: CoRoT Results

Post by Edasich on 10th April 2009, 4:55 pm

And it seems Corot-7b may be destroyed in next gigayears, doesn't it?

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Re: CoRoT Results

Post by Lazarus on 11th April 2009, 6:07 am

This interview with Pierre Barge (the French version of which is linked to in the Beyond the Cradle blog post linked to by Sirius_Alpha) includes discussion of the second planet around CoRoT-7. Looks like the RVs detect one planet, the transits detect the other...

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Re: CoRoT Results

Post by exoplanet on 11th April 2009, 8:31 am

There is something strange about the announcement of Corot-7b. They had a possible transit in their hands, they did the radial velocity follow up and they detected a clear signature of a Neptune sized planet and, I assume, the signal for Corot-7b in the residuals with large error margins. Yet, they they announce Corot-7b and *not also* Corot-7c, the Neptune-like planet, for which much better data must be available (although, it seems, not transit). Odd...

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Re: CoRoT Results

Post by Lazarus on 11th April 2009, 12:29 pm

Well CoRoT-7b was after all a CoRoT discovery. Strictly speaking, "CoRoT-7c" was not.

And super-Earths sell stories, hot Neptunes not so much.

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Re: CoRoT Results

Post by Sirius_Alpha on 16th April 2009, 5:59 pm

Information on CoRoT-6 is now available. Exoplanet.eu also has an update for CoRoT-5
http://www.exoplanet.eu/planet.php?p1=CoRoT-6&p2=b

CoRoT-6 turns out to be less massive than 30 M_j, and CoRoT-5 seems to be a little lighter, too.

StarPlanetMassP (d)Radiusa (AU)
CoRoT-Exo-1b1.03 J 1.5089557 d 1.49 J0.0254
c?
CoRoT-Exo-2b3.31 J 1.7429964 d1.465 J0.0281
CoRoT-Exo-3b21.66 J 4.2568 d1.008 J0.052
CoRoT-Exo-4b0.72 J 9.20205 d 1.19 J0.09
CoRoT-Exo-5b0.459 J 4.0384 d 1.28 J?
CoRoT-Exo-6b3.3 8.89 d 1.15 J?
CoRoT-Exo-7b0.035 J 0.8535 d0.157 J0.017
c? 3.5 d

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Re: CoRoT Results

Post by Borislav on 3rd May 2009, 1:37 pm

embargo


Last edited by Borislav on 10th May 2009, 9:33 am; edited 1 time in total

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Re: CoRoT Results

Post by Sirius_Alpha on 3rd May 2009, 3:06 pm

Shocked OMG EPIC![embargo]!


Last edited by Sirius_Alpha on 10th May 2009, 11:31 am; edited 1 time in total

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Re: CoRoT Results

Post by Borislav on 3rd May 2009, 3:59 pm

embargo


Last edited by Borislav on 10th May 2009, 9:34 am; edited 1 time in total

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Re: CoRoT Results

Post by Edasich on 3rd May 2009, 5:34 pm

Sirius_Alpha wrote:Shocked OMG EPIC!Three planets!

This presentation reports a mass for CoRoT-5 b of 0.99 M_j, much greater than the previous 0.459 M_j

OMG! Radial velocities!! I can toy with Systemic too Laughing

However, gosh! Such a hot and eerie trio of chthonian planets. I notice a much lower mass for Corot-7 b (rather 13 Me), more suitable for a 1.5 Re planet. A much warmer HD 40307 system analogue.

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Corot-7b and friends

Post by exoplanet on 3rd May 2009, 7:16 pm

This is really neat !

I guess this must be some of the stuff S. Atkinson from the blog "Beyond the Cradle" was referring to in this interview with M. Fridlund:

http://beyondthecradle.wordpress.com/2009/03/30/corot-update-with-malcolm-fridlund/

He says:

"…in what concerns good news Malcolm Fridlund
tells us that the team is still working on CoRoT-exo-7b, which is
presented, here by the Project Scientist, as a rocky planet. The first
paper is already with the referees and the second and third in the
process of writing at the moment."

Cheers

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still CoRoT-7

Post by exoplanet on 4th May 2009, 6:43 am

The fact that we now have a triple system may also explain why the second (initially 30 MEarth) planet was not announced in February. They probably had some hints that something else was going on.

Cheers

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Re: CoRoT Results

Post by Edasich on 4th May 2009, 3:03 pm

And surely not a 30 Mj object alien Laughing

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Re: CoRoT Results

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