CoRoT Results

by Sirius_Alpha on Thu May 22, 2008 5:02 pm

This thread will be dedicated to the CoRoT (Convection, Rotation, and planetary Transits) spacecraft, the first spacecraft launch with the ability to seriously look for planets, (as opposed to Hubble which found the SWEEPS candidates, but Hubble isn't quite the most reliable tool for finding exoplanets). A similar thread will be made for Kepler in the future.

In May of 2007, the first planet, CoRoT-Exo-1b was announced, and in December of 2007, the second planet was announced. In May of 2008, three more objects were announced.

So as far as planets go, we have these five objects:

Star	Planet	Mass	P (d)	Radius
CoRoT-Exo-1	b	1.03 J	1.5089557 d	1.49 J
CoRoT-Exo-2	b	3.31 J	1.7429964 d	0.83 J
CoRoT-Exo-3	b	20.2 J	4.25 d	1.17 J
CoRoT-Exo-4	b	1.1 J	9.20205 d	1.2 J
CoRoT-Exo-5	b	0.86 J	4 d	? J

by Edasich on Sat Jun 14, 2008 7:49 am

I don't get why Corot team does never publish orbital separations in Astronomical Units?!

by Edasich on Thu Jul 10, 2008 3:13 pm

Updated data for Corot-Exo-1 and 2:

http://exoplanet.eu/star.php?st=CoRoT-Exo-1
http://exoplanet.eu/star.php?st=CoRoT-Exo-2

Added orbital separations and host stars.
Both planetary companions show zero eccentricity.

by Lazarus on Thu Jul 10, 2008 4:21 pm

Seems to have also been an update for Corot-Exo-3 and 4, though the host star coordinates are still absent.

by Edasich on Thu Jul 10, 2008 4:26 pm

Only 1 and 2 show actual host star. At the moment.

by Sirius_Alpha on Thu Jul 10, 2008 4:47 pm

Additionally, they added the metallicity [Fe/H] of CoRoT-Exo-1 and 2, and updated the radius of CoRoT-Exo-2 b.
The update for CoRoT-Exo-3 is the age, now given at 0.85 Gyr.

by Sirius_Alpha on Wed Jul 16, 2008 11:04 am

CoRoT-Exo-3 b was updated. The mass is just a bit higher, now at 21.6 Jupiters, but the radius is also lager, 0.97 Jupiter radii. This brought the density down some.

by Sirius_Alpha on Wed Jul 23, 2008 9:13 pm

The paper for CoRoT-Exo-4 b is now available.

Transiting exoplanets from the CoRoT space mission V. CoRoT-Exo-4b: Stellar and planetary parameters
http://arxiv.org/abs/0807.3739

Abstract wrote:The CoRoT satellite has announced its fourth transiting planet (Aigrain et al. 2008) with space photometry. We describe and analyse complementary observations of this system performed to establish the planetary nature of the transiting body and to estimate the fundamental parameters of the planet and its parent star. We have analysed high precision radial-velocity data, ground-based photometry, and high signal-to-noise ratio spectroscopy. The parent star CoRoT-Exo-4 (2MASS 06484671-0040219) is a late F-type star of mass of 1.16 Msun and radius of 1.17 Rsun. The planet has a circular orbit with a period of 9.20205d. The planet radius is 1.19 Rjup and the mass is 0.72 Mjup. It is a gas-giant planet with a ''normal'' internal structure of mainly H and He. CoRoT-Exo-4b has the second longest period of the known transiting planets. It is an important discovery since it occupies an empty area in the mass-period diagram of transiting exoplanets.

by Edasich on Thu Jul 24, 2008 2:57 am

Not a bright F0 star, but a Solar-like one. Radius and mass were similar to those of Sun, indeed

by Sirius_Alpha on Thu Jul 24, 2008 3:31 pm

It seems the planet's orbit and the rotation period of the star are synchronized.
http://www.space.com/scienceastronomy/080724-new-exoplanet.html

Space.com wrote:By tracking the time between transits, a team of scientists
led by the French space agency CNES measured how long the planet takes to
revolve around its star, and found that it is the same period of time its star,
which is slightly larger than our sun, takes to rotate 360 degrees. They were
able to derive the star's period of rotation by monitoring dark spots on its
surface that rotated in and out of view.

by Sirius_Alpha on Sat Jul 26, 2008 11:11 am

Earlier, there were rumors that CoRoT had found a 1.7 Earth-radius transiting object. Here's the light curve for that. The first image is the normal light curve, the second image is zoomed in on it.

The CoRoT website wrote:Good news also on the side of finding small planets.

CoRoT has picked up signals as small as 5 parts in ten thousand. If it
is the transit, the planet's radius would be 1.7 times the radius of
the Earth.

(ref)

by Lazarus on Thu Aug 07, 2008 11:09 am

Sirius_Alpha wrote:The paper for CoRoT-Exo-4 b is now available.

Transiting exoplanets from the CoRoT space mission V. CoRoT-Exo-4b: Stellar and planetary parameters
http://arxiv.org/abs/0807.3739

There are two papers about this object, the first is "Transiting exoplanets from the CoRoT space mission IV: CoRoT-Exo-4b: A transiting planet in a 9.2 day synchronous orbit"

by Sirius_Alpha on Thu Aug 07, 2008 12:28 pm

Yes, indeed.

I like how each CoRoT planet is getting enough attention has they have been. For example, CoRoT-Exo-2 had two papers on it, as does CoRoT-Exo-4. With papers with this degree of specificity, it doesn't leave the planets seemingly void of information. We actually know something interesting about the planets, more than just their orbital and physical parameters. As opposed to the most recent 10 WASP planets... which seem little more than vague numbers for which we still waiting on papers for.

by Sirius_Alpha on Thu Sep 04, 2008 5:19 pm

http://exoplanet.eu/papers/Deleuil-CoRoT3.pdf (pdf)

(updated figures) CoRoT-Exo-5 b has a period of 4.03 days, a mass of 0.67 Jupiters, and a radius of 1.2 Jupiter radii.

by Darkness nova on Sat Sep 06, 2008 8:21 pm

Ohh this is all interesting and quite thoroughly done. The lack of au data makes it confusing however. I have to actually try and fail to figure out how far they really are from the star.

Any more updates on the potential 1.7 earth radius one or was it alot larger?

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