Reference : Improved precision on the radius of the nearby super-Earth 55 Cnc e
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/102248
Improved precision on the radius of the nearby super-Earth 55 Cnc e
English
Gillon, Michaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Demory, B.-O. [> > > >]
Benneke, B. [> > > >]
Valencia, D. [> > > >]
Deming, D. [> > > >]
Seager, S. [> > > >]
Lovis, C. [> > > >]
Mayor, M. [> > > >]
Pepe, F. [> > > >]
Queloz, D. [> > > >]
Segransan, Damien [> > > >]
Udry, S. [> >]
1-Oct-2012
Astronomy and Astrophysics
EDP Sciences
539
A28
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] Astrophysics - Earth and Planetary Astrophysics
[en] We report on new transit photometry for the super-Earth 55 Cnc e obtained with Warm Spitzer/IRAC at 4.5 microns. An individual analysis of these new data leads to a planet radius of 2.21-0.16+0.15 Rearth, in good agreement with the values previously derived from the MOST and Spitzer transit discovery data. A global analysis of both Spitzer transit time-series improves the precision on the radius of the planet at 4.5 microns to 2.20+-0.12 Rearth. We also performed an independent analysis of the MOST data, paying particular attention to the influence of the systematic effects of instrumental origin on the derived parameters and errors by including them in a global model instead of performing a preliminary detrending-filtering processing. We deduce from this reanalysis of MOST data an optical planet radius of 2.04+-0.15 Rearth that is consistent with our Spitzer infrared radius. Assuming the achromaticity of the transit depth, we performed a global analysis combining Spitzer and MOST data that results in a planet radius of 2.17+-0.10 Rearth (13,820+-620 km). These results confirm that the most probable composition of 55 Cnc e is an envelope of supercritical water above a rocky nucleus.
http://hdl.handle.net/2268/102248
http://adsabs.harvard.edu/abs/2012A%26A...539A..28G
7 pages, 7 figures.

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