Improved precision on the radius of the nearby super-Earth 55 Cnc e
We report on new transit photometry for the super-Earth 55 Cnc e obtained with Warm Spitzer/IRAC at 4.5 μm. An individual analysis of these new data leads to a planet radius of [superscript 2.21]+0.15 [over] -0.16 R[subscript ⊕], which agrees well with the values previously derived from the MOST an...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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EDP Sciences
2012
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| Online Access: | http://hdl.handle.net/1721.1/75308 https://orcid.org/0000-0002-6892-6948 |
| _version_ | 1811089811893649408 |
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| author | Gillon, M. Demory, Brice-Olivier Benneke, Bjoern Valencia, Diana Deming, Drake Seager, Sara Lovis, Christophe Mayor, Michel Pepe, F. Queloz, D. Ségransan, D. Udry, S. |
| author2 | Massachusetts Institute of Technology. Department of Aeronautics and Astronautics |
| author_facet | Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Gillon, M. Demory, Brice-Olivier Benneke, Bjoern Valencia, Diana Deming, Drake Seager, Sara Lovis, Christophe Mayor, Michel Pepe, F. Queloz, D. Ségransan, D. Udry, S. |
| author_sort | Gillon, M. |
| collection | MIT |
| description | We report on new transit photometry for the super-Earth 55 Cnc e obtained with Warm Spitzer/IRAC at 4.5 μm. An individual analysis of these new data leads to a planet radius of [superscript 2.21]+0.15 [over] -0.16 R[subscript ⊕], which agrees well 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 μm to 2.20 ± 0.12 R[subscript ⊕]. 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 an optical planet radius of 2.04 ± 0.15 R[subscript ⊕] from this reanalysis of MOST data, which is consistent with the previous MOST result and 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 R[subscript ⊕] (13 820 ± 620 km). These results point to 55 Cnc e having a gaseous envelope overlying a rocky nucleus, in agreement with previous works. A plausible composition for the envelope is water which would be in super-critical form given the equilibrium temperature of the planet. |
| first_indexed | 2024-09-23T14:25:03Z |
| format | Article |
| id | mit-1721.1/75308 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:25:03Z |
| publishDate | 2012 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | mit-1721.1/753082022-09-29T09:20:19Z Improved precision on the radius of the nearby super-Earth 55 Cnc e Gillon, M. Demory, Brice-Olivier Benneke, Bjoern Valencia, Diana Deming, Drake Seager, Sara Lovis, Christophe Mayor, Michel Pepe, F. Queloz, D. Ségransan, D. Udry, S. Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Demory, Brice-Olivier Benneke, Bjoern Valencia, Diana Seager, Sara We report on new transit photometry for the super-Earth 55 Cnc e obtained with Warm Spitzer/IRAC at 4.5 μm. An individual analysis of these new data leads to a planet radius of [superscript 2.21]+0.15 [over] -0.16 R[subscript ⊕], which agrees well 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 μm to 2.20 ± 0.12 R[subscript ⊕]. 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 an optical planet radius of 2.04 ± 0.15 R[subscript ⊕] from this reanalysis of MOST data, which is consistent with the previous MOST result and 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 R[subscript ⊕] (13 820 ± 620 km). These results point to 55 Cnc e having a gaseous envelope overlying a rocky nucleus, in agreement with previous works. A plausible composition for the envelope is water which would be in super-critical form given the equilibrium temperature of the planet. National Aeronautics and Space Administration 2012-12-10T13:59:39Z 2012-12-10T13:59:39Z 2012-02 2011-10 Article http://purl.org/eprint/type/JournalArticle 0004-6361 1432-0746 http://hdl.handle.net/1721.1/75308 Gillon, M. et al. “Improved Precision on the Radius of the Nearby super-Earth 55 Cnc e.” Astronomy & Astrophysics 539 (2012): A28. https://orcid.org/0000-0002-6892-6948 en_US http://dx.doi.org/10.1051/0004-6361/201118309 Astronomy and Astrophysics Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf EDP Sciences arXiv |
| spellingShingle | Gillon, M. Demory, Brice-Olivier Benneke, Bjoern Valencia, Diana Deming, Drake Seager, Sara Lovis, Christophe Mayor, Michel Pepe, F. Queloz, D. Ségransan, D. Udry, S. Improved precision on the radius of the nearby super-Earth 55 Cnc e |
| title | Improved precision on the radius of the nearby super-Earth 55 Cnc e |
| title_full | Improved precision on the radius of the nearby super-Earth 55 Cnc e |
| title_fullStr | Improved precision on the radius of the nearby super-Earth 55 Cnc e |
| title_full_unstemmed | Improved precision on the radius of the nearby super-Earth 55 Cnc e |
| title_short | Improved precision on the radius of the nearby super-Earth 55 Cnc e |
| title_sort | improved precision on the radius of the nearby super earth 55 cnc e |
| url | http://hdl.handle.net/1721.1/75308 https://orcid.org/0000-0002-6892-6948 |
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