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  Multiple water band detections in the CARMENES near-infrared transmission spectrum of HD 189733 b

Alonso-Floriano, F. J., Sánchez-López, A., Snellen, I. A. G., López-Puertas, M., Nagel, E., Amado, P. J., et al. (2019). Multiple water band detections in the CARMENES near-infrared transmission spectrum of HD 189733 b. Astronomy and Astrophysics, 621.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-D43F-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-D440-3
Genre: Journal Article

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Alonso-Floriano, F. J.1, Author
Sánchez-López, A.1, Author
Snellen, I. A. G.1, Author
López-Puertas, M.1, Author
Nagel, E.1, Author
Amado, P. J.1, Author
Bauer, F. F.1, Author
Caballero, J. A.1, Author
Czesla, S.1, Author
Nortmann, L.1, Author
Pallé, E.1, Author
Salz, M.1, Author
Reiners, A.1, Author
Ribas, I.1, Author
Quirrenbach, A.1, Author
Aceituno, J.1, Author
Anglada-Escudé, G.1, Author
Béjar, V. J. S.1, Author
Guenther, E. W.1, Author
Henning, T.1, Author
Kaminski, A.1, AuthorKürster, M.1, AuthorLampón, M.1, AuthorLara, L. M.1, AuthorMontes, D.1, AuthorMorales, J. C.1, AuthorTal-Or, L.1, AuthorSchmitt, J. H. M. M.1, AuthorZapatero Osorio, M. R.1, AuthorZechmeister, M.1, Author more..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: planets and satellites: atmospheres planets and satellites: individual: HD 189733 b techniques: spectroscopic infrared: planetary systems Astrophysics - Earth and Planetary Astrophysics
 Abstract: <BR /> Aims: We explore the capabilities of CARMENES for characterising hot-Jupiter atmospheres by targeting multiple water bands, in particular, those at 1.15 and 1.4 μm. Hubble Space Telescope observations suggest that this wavelength region is relevant for distinguishing between hazy and/or cloudy and clear atmospheres. <BR /> Methods: We observed one transit of the hot Jupiter HD 189733 b with CARMENES. Telluric and stellar absorption lines were removed using SYSREM, which performs a principal component analysis including proper error propagation. The residual spectra were analysed for water absorption with cross-correlation techniques using synthetic atmospheric absorption models. <BR /> Results: We report a cross-correlation peak at a signal-to-noise ratio (S/N) of 6.6, revealing the presence of water in the transmission spectrum of HD 189733 b. The absorption signal appeared slightly blueshifted at -3.9 ± 1.3 km s-1. We measured the individual cross-correlation signals of the water bands at 1.15 and 1.4 μm, finding cross-correlation peaks at S/N of 4.9 and 4.4, respectively. The 1.4 μm feature is consistent with that observed with the Hubble Space Telescope. <BR /> Conclusions: The water bands studied in this work have been mainly observed in a handful of planets from space. Being able also to detect them individually from the ground at higher spectral resolution can provide insightful information to constrain the properties of exoplanet atmospheres. Although the current multi-band detections can not yet constrain atmospheric haze models for HD 189733 b, future observations at higher S/N could provide an alternative way to achieve this aim.

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 Dates: 2019
 Publication Status: Published in print
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 621 Sequence Number: - Start / End Page: - Identifier: -