dc.contributor.author | Nikolov, N | |
dc.contributor.author | Sing, David K. | |
dc.contributor.author | Gibson, Neale P. | |
dc.contributor.author | Fortney, J. J. | |
dc.contributor.author | Evans, Thomas M. | |
dc.contributor.author | Barstow, Joanna K. | |
dc.contributor.author | Kataria, Tiffany | |
dc.contributor.author | Wilson, Paul A. | |
dc.date.accessioned | 2016-12-08T11:38:11Z | |
dc.date.issued | 2016-12-01 | |
dc.description.abstract | We present transmission spectroscopy of the warm Saturn-mass exoplanet WASP-39b made with the Very Large Telescope FOcal Reducer and Spectrograph (FORS2) across the wavelength range 411–810 nm. The transit depth is measured with a typical precision of 240 parts per million (ppm) in wavelength bins of 10 nm on a V = 12.1 mag star. We detect the sodium absorption feature (3.2σ) and find evidence of potassium. The ground-based transmission spectrum is consistent with Hubble Space Telescope (HST) optical spectroscopy, supporting the interpretation that WASP-39b has a largely clear atmosphere. Our results demonstrate the great potential of the recently upgraded FORS2 spectrograph for optical transmission spectroscopy, with which we obtained HST-quality light curves from the ground. | en_GB |
dc.description.sponsorship | The research leading to these results received funding from the European Research Council under the European Union Seventh Framework Program (FP7/2007-2013) ERC grant agreement no. 336792. N.P.G. gratefully acknowledges support from the Royal Society in the form of a University Research Fellowship. J.K.B. and E.R.C. acknowledge support from project 617119 (ExoLights). P.A.W. acknowledges the support of the French Agence Nationale de la Recherche (ANR), under program ANR-12-BS05-0012 "Exo-Atmos." | en_GB |
dc.identifier.citation | Vol. 832, No. 2 | en_GB |
dc.identifier.doi | http://dx.doi.org/10.3847/0004-637X/832/2/191 | |
dc.identifier.uri | http://hdl.handle.net/10871/24786 | |
dc.language.iso | en | en_GB |
dc.publisher | American Astronomical Society | en_GB |
dc.subject | planets and satellites | en_GB |
dc.subject | atmospheres | en_GB |
dc.subject | stars | en_GB |
dc.subject | individual (WASP-39) | en_GB |
dc.subject | techniques | en_GB |
dc.subject | photometric | en_GB |
dc.subject | techniques | en_GB |
dc.subject | spectroscopic | en_GB |
dc.title | VLT FORS2 comparative transmission spectroscopy: Detection of Na in the atmosphere of WASP-39b from the ground | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2016-12-08T11:38:11Z | |
dc.identifier.issn | 0004-637X | |
dc.description | Article | en_GB |
dc.description | This is the author accepted manuscript. The final version is available from American Astronomical Society via the DOI in this record. | en_GB |
dc.identifier.eissn | 1538-4357 | |
dc.identifier.journal | Astrophysical Journal | en_GB |