Detection of sodium in the atmosphere of WASP-69b

Abstract

Transit spectroscopy is one of the most commonly used methods to characterize exoplanets atmospheres. From the ground, these observations are very challenging due to the terrestrial atmosphere and its intrinsic variations, but high-spectral resolution observations overcome this difficulty by resolving the spectral lines and taking advantage of the different Doppler velocities of the Earth, the host star and the exoplanet. We analyze the transmission spectrum around the Na I doublet at 589 nm of the exoplanet WASP-69b, a hot Jupiter orbiting a K-type star with a period of 3.868 days, and compare the analysis to that of the well-know hot Jupiter HD 189733b. We also present the analysis of the Rossiter-McLaughlin effect for WASP-69b. Two transits of WASP-69b were observed with the HARPS-North spectrograph (R = 115 000) at the TNG telescope. We perform a telluric contamination subtraction based on the comparison between the observed spectra and a telluric water model. Then, the common steps of the differential spectroscopy are followed to extract the transmission spectrum. The method is tested with archival transit data of the extensively studied exoplanet HD 189733b, obtained with the HARPS-South spectrograph at ESO 3.6m telescope, and then applied to WASP-69b data. For HD 189733b, we spectrally resolve the Na I doublet and measure line contrasts of $0.72\pm 0.05\%$ (D2) and $0.51\pm 0.05\%$ (D1), and FWHMs of $0.64\pm 0.04$Å (D2) and $0.60\pm 0.06$Å (D1), in agreement with previously published results. A net blueshift of $\sim 0.04$Å is measured. For WASP-69b only the contrast of the D2 line is measured ($5.8\pm 0.3\%$). Even if this corresponds to a detection at the $5\sigma$-level of excess absorption of $0.5\pm 0.1\%$ in a passband of $1.5$Å, more transits are needed to fully characterize the lines profiles and retrieve accurate atmospheric properties.

15 pages, 14 figures

References in corpus (12)

• Improved parameters for extrasolar transiting planets
• Sodium Absorption From the Exoplanetary Atmosphere of HD189733b Detected in the Optical Transmission Spectrum
• Spectrally resolved detection of sodium in the atmosphere of HD189733b with the HARPS spectrograph
• Ground-based detection of sodium in the transmission spectrum of exoplanet HD209458b
• PyTransit: Fast and Easy Exoplanet Transit Modelling in Python
• Stellar activity of planetary host star HD 189733
• Atmospheric characterization of Proxima b by coupling the Sphere high-contrast imager to the Espresso spectrograph
• Measurement of the Spin-Orbit Alignment in the Exoplanetary System HD 189733
• The origin of the excess transit absorption in the HD 189733 system: planet or star?
• High resolution transmission spectrum of the Earth's atmosphere -- Seeing Earth as an exoplanet using a lunar eclipse
• A Non-isothermal Theory for Interpreting Sodium Lines in Transmission Spectra of Exoplanets
• GTC OSIRIS transiting exoplanet atmospheric survey: detection of potassium in HAT-P-1b from narrowband spectrophotometry

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