dc.contributor.author | Sing, David K. | |
dc.contributor.author | Desert, J.-M. | |
dc.contributor.author | Lecavelier des Etangs, A. | |
dc.contributor.author | Ballester, G. | |
dc.contributor.author | Vidal-Madjar, A. | |
dc.contributor.author | Parmentier, V. | |
dc.contributor.author | Hebrard, G. | |
dc.contributor.author | Henry, G. | |
dc.date.accessioned | 2014-12-17T14:29:15Z | |
dc.date.issued | 2009 | |
dc.description.abstract | We present Hubble Space Telescope near-infrared transit photometry of the nearby hot-Jupiter HD189733b. The observations were
taken with the NICMOS instrument during five transits, with three transits executed with a narrowband filter at 1.87 μm and two
performed with a narrowband filter at 1.66 μm. Our observing strategy using narrowband filters is insensitive to the usual HST intraorbit
and orbit-to-orbit measurement of systematic errors, allowing us to accurately and robustly measure the near-IR wavelength
dependance of the planetary radius. Our measurements fail to reproduce the previously claimed detection of an absorption signature
of atmospheric H2O below2 μm at a 5σ confidence level.We measure a planet-to-star radius contrast of 0.15498±0.00035 at 1.66 μm
and a contrast of 0.15517 ± 0.00019 at 1.87 μm. Both of our near-IR planetary radii values are in excellent agreement with the levels
expected from Rayleigh scattering by sub-micron haze particles, observed at optical wavelengths, indicating that upper-atmospheric
haze still dominates the near-IR transmission spectra over the absorption from gaseous molecular species at least below 2 μm. | en_GB |
dc.description.sponsorship | CNES | en_GB |
dc.description.sponsorship | NASA | en_GB |
dc.description.sponsorship | NSF | en_GB |
dc.description.sponsorship | Tennessee State University | en_GB |
dc.description.sponsorship | State of Tennessee | en_GB |
dc.identifier.citation | Vol. 505 (2), pp. 891-899 | en_GB |
dc.identifier.doi | 10.1051/0004-6361/200912776 | |
dc.identifier.grantnumber | GO-11117 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/16079 | |
dc.language.iso | en | en_GB |
dc.publisher | EDP Sciences for European Southern Observatory (ESO) | en_GB |
dc.relation.url | http://dx.doi.org/10.1051/0004-6361/200912776 | en_GB |
dc.subject | planetary systems | en_GB |
dc.subject | stars: individual: HD 189733 | en_GB |
dc.subject | techniques: photometric | en_GB |
dc.subject | binaries: eclipsing | en_GB |
dc.title | Transit spectrophotometry of the exoplanet HD 189733b. I. Searching for water but finding haze with HST NICMOS | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2014-12-17T14:29:15Z | |
dc.identifier.issn | 0004-6361 | |
dc.description | Copyright © ESO 2009 | en_GB |
dc.identifier.eissn | 1432-0746 | |
dc.identifier.journal | Astronomy and Astrophysics | en_GB |