Re: CoRoT Results

Lazarus · by Lazarus on Thu Sep 17, 2009 2:38 pm

So taking the mass-radius relationships from here and plugging in 4.8 Earth masses, I get the following

Composition	m₁/m_⊕	r₁/r_⊕	m_s	r_s	r/r_⊕
Iron	4.34	2.23	1.11	0.53	1.17
Perovskite	7.38	3.58	0.65	0.46	1.64
Ice	8.16	4.73	0.59	0.45	2.11
Mercury	6.41	2.84	0.75	0.48	1.35
Earth	6.41	3.19	0.75	0.48	1.52
25% Ice	6.41	3.63	0.75	0.48	1.73
45% Ice	6.88	4.02	0.70	0.47	1.87
75% Ice	7.63	4.42	0.63	0.45	2.00

Comes out quite close to a pure-silicate planet without a significant iron core.

Sirius_Alpha · by Sirius_Alpha on Thu Sep 17, 2009 4:09 pm

Lazarus, regarding the transits of Mercury and Venus,

I knew that! I promise! Very Happy

It's amazing how often I forget about our own solar system when thinking about what we have and haven't found regarding planets. Embarassed

Edasich · by Edasich on Mon Sep 21, 2009 5:28 am

Paper about Corot-5. With RV sets by SOPHIE and HARPS too.

Transiting exoplanets from the CoRoT space mission: VII. The "hot-Jupiter"-type planet CoRoT-5b

Moreover, it seems another jovian made of heavy elements alike HAT-P-3 b and HD 149026 b.

Standard recipes that account for missing physics (kinetic energy transport or increased opacities) can explain this large size, and predict that the planet is mostly made of hydrogen-helium, with at most 28M⊕ of heavy elements (maximum value obtained in the kinetic energy model, assuming 0.5% of the incoming energy is dissipated at the planet center). Thus, CoRoT-5b supports the proposed link between the metallicity of planets and of their host star.

Emphasis mine.

Borislav · by Borislav on Mon Sep 21, 2009 5:31 am

Now we wait the article about Corot-6b, afterwards publish the unknown planets Corot?

Edasich · by Edasich on Mon Sep 21, 2009 5:43 am

Sure. They're keeping us on tenter-hooks since too much time!

Lazarus · by Lazarus on Mon Sep 21, 2009 6:47 pm

Lots of heavy elements? Hmmm...

CoRoT-5b has a density of 0.217^+0.031_−0.025 g cm⁻³, similar to the planets WASP-12b and WASP-15b (Hebb et al. 2009; West et al. 2009), implying that it belongs to the planets with the lowest mean density found so far. As such, it is found to be larger by 20% than standard evolution models (Guillot et al. 2006) would predict.

(emphasis mine)

Plus, yes the host star is 2MASS J06450653+0048548 Smile

Borislav · by Borislav on Tue Sep 22, 2009 7:07 am

COROT 1000 days in orbit!
http://smsc.cnes.fr/COROT/

Sirius_Alpha · by Sirius_Alpha on Tue Sep 22, 2009 8:59 am

Yay

. That's one planet every ~143 days (speaking strictly CoRoT discoveries).

Lazarus · by Lazarus on Fri Oct 23, 2009 6:15 pm

Special CoRoT edition of Astronomy & Astrophysics.

Many of these papers have already been seen as arXiv preprints already. Quite a lot of asteroseismology in there, which we haven't been tracking so well here (not surprising given this is after all an extrasolar planets forum not an asteroseismology one!)

Sirius_Alpha · by Sirius_Alpha on Tue Oct 27, 2009 8:41 am

Looks like the orbital periods of CoRoT-1 b and CoRoT-2 b are fairly constant over four years.

Pre-discovery observations of CoRoT-1b and CoRoT-2b with the BEST survey
http://arxiv.org/abs/0910.4659

Abstract wrote:The BEST wide-angle telescope installed at the Observatoire de Haute-Provence and operated in remote control from Berlin by the Institut fuer Planetenforschung, DLR, has observed the CoRoT target fields prior to the mission. The resulting archive of stellar photometric lightcurves is used to search for deep transit events announced during CoRoT's alarm-mode to aid in fast photometric confirmation of these events. The "initial run" field of CoRoT (IRa01) has been observed with BEST in November and December 2006 for 12 nights. The first "long run" field (LRc01) was observed from June to September 2005 for 35 nights. After standard CCD data reduction, aperture photometry has been performed using the ISIS image subtraction method. About 30,000 lightcurves were obtained in each field. Transits of the first detected planets by the CoRoT mission, CoRoT-1b and CoRoT-2b, were found in archived data of the BEST survey and their lightcurves are presented here. Such detections provide useful information at the early stage of the organization of follow-up observations of satellite alarm-mode planet candidates. In addition, no period change was found over ~4 years between the first BEST observation and last available transit observations.

Borislav · by Borislav on Tue Oct 27, 2009 9:01 am

http://tamise.ujf-grenoble.fr/wws/arc/exoplanets/2009-10/msg00004.html

The French Agency CNES has decided on October 23, in agreement with
the partners of the mission (Austria, Belgium, Brazil,
ESA, Germany and Spain), to extend the operations of the spacecraft
until April 2013.

Sirius_Alpha · by Sirius_Alpha on Tue Oct 27, 2009 10:02 am

Great news!

lodp · by lodp on Mon Nov 02, 2009 9:31 pm

Looks like the radial velocities for 7c are up on exosolar planets encyclopedia

Sporry that should read Corot 7: ie b+c.

http://cdsarc.u-strasbg.fr/cgi-bin/nph-Cat/html/max=109?J/A%2bA/506/303/tablea1.dat

Sirius_Alpha · by Sirius_Alpha on Tue Nov 03, 2009 3:11 am

Great!
I seem to be having issues making a .vels file with the data though. Systemic complains about a null pointer exception so I guess I don't have it referred to properly somewhere.