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An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet
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dc.contributor.author | Nikolov, N. | |
dc.contributor.author | Sing, D. K. | |
dc.contributor.author | Fortney, J. J. | |
dc.contributor.author | Goyal, J. M. | |
dc.contributor.author | Drummond, B. | |
dc.contributor.author | Evans, T. M. | |
dc.contributor.author | Gibson, N. P. | |
dc.contributor.author | De Mooj, E. J. W. | |
dc.contributor.author | Rustamkulov, Z. | |
dc.contributor.author | Wakeford, H. R. | |
dc.contributor.author | Smalley, B. | |
dc.contributor.author | Burgasser, A. J. | |
dc.contributor.author | Hellier, C. | |
dc.contributor.author | Helling, Christiane | |
dc.contributor.author | Mayne, N. J. | |
dc.contributor.author | Madhusudhan, N. | |
dc.contributor.author | Kataria, T. | |
dc.contributor.author | Baines, J. | |
dc.contributor.author | Carter, A. L. | |
dc.contributor.author | Ballester, G. E. | |
dc.contributor.author | Barstow, J. K. | |
dc.contributor.author | McCleery, J. | |
dc.contributor.author | Spake, J. J. | |
dc.date.accessioned | 2018-11-07T00:48:43Z | |
dc.date.available | 2018-11-07T00:48:43Z | |
dc.date.issued | 2018-05-24 | |
dc.identifier | 253290768 | |
dc.identifier | f84187cd-c4ed-4d17-a719-a9bf197ac890 | |
dc.identifier | 85047598664 | |
dc.identifier | 000432794900040 | |
dc.identifier.citation | Nikolov , N , Sing , D K , Fortney , J J , Goyal , J M , Drummond , B , Evans , T M , Gibson , N P , De Mooj , E J W , Rustamkulov , Z , Wakeford , H R , Smalley , B , Burgasser , A J , Hellier , C , Helling , C , Mayne , N J , Madhusudhan , N , Kataria , T , Baines , J , Carter , A L , Ballester , G E , Barstow , J K , McCleery , J & Spake , J J 2018 , ' An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet ' , Nature , vol. 557 , no. 7706 , pp. 526-529 . https://doi.org/10.1038/s41586-018-0101-7 | en |
dc.identifier.issn | 0028-0836 | |
dc.identifier.uri | https://hdl.handle.net/10023/16406 | |
dc.description | The research leading to these results received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement number 336792. A.J.B. is a US/UK Fulbright Scholar. J.M.G. and N.J.M. acknowledge support from a Leverhulme Trust Research Project Grant. J.K.B. is a Royal Astronomical Society Research Fellow. | en |
dc.description.abstract | Broad absorption signatures from alkali metals, such as the sodium (Na i) and potassium (K i) resonance doublets, have long been predicted in the optical atmospheric spectra of cloud-free irradiated gas giant exoplanets1,2,3. However, observations have revealed only the narrow cores of these features rather than the full pressure-broadened profiles4,5,6. Cloud and haze opacity at the day–night planetary terminator are considered to be responsible for obscuring the absorption-line wings, which hinders constraints on absolute atmospheric abundances7,8,9. Here we report an optical transmission spectrum for the ‘hot Saturn’ exoplanet WASP-96b obtained with the Very Large Telescope, which exhibits the complete pressure-broadened profile of the sodium absorption feature. The spectrum is in excellent agreement with cloud-free, solar-abundance models assuming chemical equilibrium. We are able to measure a precise, absolute sodium abundance of logεNa = 6.9+0.6−0.4, and use it as a proxy for the planet’s atmospheric metallicity relative to the solar value (Zp/Zʘ = 2.3+8.9−1.7). This result is consistent with the mass–metallicity trend observed for Solar System planets and exoplanets10,11,12. | |
dc.format.extent | 18 | |
dc.format.extent | 9252916 | |
dc.language.iso | eng | |
dc.relation.ispartof | Nature | en |
dc.subject | QB Astronomy | en |
dc.subject | QC Physics | en |
dc.subject | NDAS | en |
dc.subject | BDC | en |
dc.subject | R2C | en |
dc.subject | ~DC~ | en |
dc.subject.lcc | QB | en |
dc.subject.lcc | QC | en |
dc.title | An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. St Andrews Centre for Exoplanet Science | en |
dc.identifier.doi | 10.1038/s41586-018-0101-7 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2018-11-07 |
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