Detection of Fe and evidence for TiO in the dayside emission spectrum of WASP-33b

Abstract

Theoretical studies predict the presence of thermal inversions in the atmosphere of highly irradiated gas giant planets. Recent observations have identified these inversion layers. However, the role of different chemical species in their formation remains unclear. We search for the signature of the thermal inversion agents TiO and Fe in the dayside emission spectrum of the ultra-hot Jupiter WASP-33b. The spectra were obtained with CARMENES and HARPS-N, covering different wavelength ranges. Telluric and stellar absorption lines were removed with SYSREM. We cross-correlated the residual spectra with model spectra to retrieve the signals from the planetary atmosphere. We find evidence for TiO at a significance of 4.9$\sigma$ with CARMENES. The strength of the TiO signal drops close to the secondary eclipse. No TiO signal is found with HARPS-N. An injection-recovery test suggests that the TiO signal is below the detection level at the wavelengths covered by HARPS-N. The emission signature of Fe is detected with both instruments at significance levels of 5.7$\sigma$ and 4.5$\sigma$, respectively. By combining all observations, we obtain a significance level of 7.3$\sigma$ for Fe. We find the TiO signal at $K_{\mathrm{p}}$ = $248.0_{-2.5}^{+2.0}$ km s${}^{-1}$, which is in disagreement with the Fe detection at $K_{\mathrm{p}}$ = $225.0_{-3.5}^{+4.0}$ km s${}^{-1}$. The $K_{\mathrm{p}}$ value for Fe is in agreement with prior investigations. The model spectra require different temperature profiles for TiO and Fe to match the observations. We observe a broader line profile for Fe than for TiO. Our results confirm the existence of a temperature inversion layer in the planetary atmosphere. The observed $K_{\mathrm{p}}$ offset and different strengths of broadening in the line profiles suggest the existence of a TiO-depleted hot spot in the planetary atmosphere.

21 pages, 20 figures, A&A, in press

References in corpus (16)

• The fast spin-rotation of a young extrasolar planet
• Can TiO Explain Thermal Inversions in the Upper Atmospheres of Irradiated Giant Planets?
• An ultrahot gas-giant exoplanet with a stratosphere
• Detection of Fe I in the atmosphere of the ultra-hot Jupiter WASP-121b, and a new likelihood-based approach for Doppler-resolved spectroscopy
• Detection of titanium oxide in the atmosphere of a hot Jupiter
• Weighing The Non-Transiting Hot Jupiter Tau BOO b
• New Analysis Indicates No Thermal Inversion in the Atmosphere of HD 209458b
• Neutral Iron Emission Lines From The Day-side Of KELT-9b -- The GAPS Programme With HARPS-N At TNG XX
• A search for TiO in the optical high-resolution transmission spectrum of HD 209458b: Hindrance due to inaccuracies in the line database
• Climate of an Ultra hot Jupiter: Spectroscopic phase curve of WASP-18b with HST/WFC3
• New Avenues for Thermal Inversions in hot Jupiters
• Searching for Thermal Inversion Agents in the Transmission Spectrum of MASCARA-2b/KELT-20b: Detection of Neutral Iron and Ionised Calcium H$\&$K Lines
• Temporal Variability in Hot Jupiter Atmospheres
• TESS unveils the phase curve of WASP-33b. Characterization of the planetary atmosphere and the pulsations from the star
• Detection of the hydrogen Balmer lines in the ultra-hot Jupiter WASP-33b
• Time-resolved rotational velocities in the upper atmosphere of WASP-33 b

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