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A weak spectral signature of water vapour in the atmosphere of HD 179949 b at high spectral resolution in the L band
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Webb, R. K., Brogi, Matteo, Gandhi, Siddharth, Line, M. R., Birkby, J. L., Chubb, K. L., Snellen, I. A. G. and Yurchenko, S. (2020) A weak spectral signature of water vapour in the atmosphere of HD 179949 b at high spectral resolution in the L band. Monthly Notices of the Royal Astronomical Society, 494 . pp. 108-119. doi:10.1093/mnras/staa715 ISSN 1745-3933.
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Official URL: http://dx.doi.org/10.1093/mnras/staa715
Abstract
High-resolution spectroscopy (R≤20,000) is currently the only known method to constrain the orbital solution and atmospheric properties of non-transiting hot Jupiters. It does so by resolving the spectral features of the planet into a forest of spectral lines and directly observing its Doppler shift while orbiting the host star. In this study, we analyse VLT/CRIRES (R=100,000) L-band observations of the non-transiting giant planet HD 179949 b centred around 3.5μm. We observe a weak (3.0σ, or S/N=4.8) spectral signature of H2O in absorption contained within the radial velocity of the planet at superior-conjunction, with a mild dependence on the choice of line list used for the modelling. Combining this data with previous observations in the K band, we measure a detection significance of 8.4σ for an atmosphere that is most consistent with a shallow lapse-rate, solar C/O ratio, and with CO and H2O being the only major sources of opacity in this wavelength range. As the two sets of data were taken 3 yr apart, this points to the absence of strong radial-velocity anomalies due, e.g. to variability in atmospheric circulation. We measure a projected orbital velocity for the planet of K_P=(145.2±2.0) km/s (1σ ) and improve the error bars on this parameter by ∼70 per cent. However, we only marginally tighten constraints on orbital inclination (66.2+3.7−3.1 deg) and planet mass (0.963+0.036−0.031 Jupiter masses), due to the dominant uncertainties of stellar mass and semi-major axis. Follow ups of radial-velocity planets are thus crucial to fully enable their accurate characterization via high-resolution spectroscopy.
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Planets -- Atmospheres , Satellites -- Atmospheres , High resolution spectroscopy | |||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||||||||
Official Date: | 1 May 2020 | |||||||||||||||||||||
Dates: |
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Volume: | 494 | |||||||||||||||||||||
Page Range: | pp. 108-119 | |||||||||||||||||||||
DOI: | 10.1093/mnras/staa715 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Rebecca K Webb, Matteo Brogi, Siddharth Gandhi, Michael R Line, Jayne L Birkby, Katy L Chubb, Ignas A G Snellen, Sergey N Yurchenko, A weak spectral signature of water vapour in the atmosphere of HD 179949 b at high spectral resolution in the L band, Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 1, May 2020, Pages 108–119, is available online at: https://doi.org/10.1093/mnras/staa715 | |||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
Date of first compliant deposit: | 2 July 2020 | |||||||||||||||||||||
Date of first compliant Open Access: | 2 July 2020 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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