Abstract
We analyze the high-resolution emission spectrum of WASP-33b taken using the High Dispersion Spectrograph (R ~ 165,000) on the 8.2 m Subaru telescope. The data cover λ ≍ 6170-8817 Å, divided over 30 spectral orders. The telluric and stellar lines are removed using a de-trending algorithm, SYSREM, before cross-correlating with planetary spectral templates. We calculate the templates assuming a 1D plane-parallel hydrostatic atmosphere including continuum opacity of bound-free H- and Rayleigh scattering by H2 with a range of constant abundances of Fe I. Using a likelihood-mapping analysis, we detect an Fe I emission signature at 6.4σ located at Kp of 226.0 _{-2.3}^{+2.1} km/s and vsys of -3.2 _{-1.8}^{+2.1} km/s — consistent with the planet's expected velocity in the literature. We also confirm the existence of a thermal inversion in the dayside of the planet, which is very likely to be caused by the presence of Fe I and previously detected TiO in the atmosphere. This makes WASP-33b one of the prime targets to study the relative contributions of both species to the energy budget of an ultra-hotJupiter. * Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Original language | English |
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Article number | L31 |
Number of pages | 9 |
Journal | The Astrophysical Journal Letters |
Volume | 898 |
Issue number | 2 |
DOIs | |
Publication status | Published - 28 Jul 2020 |
Keywords
- Exoplanet atmospheres
- Exoplanet atmospheric composition
- High resolution spectroscopy
- 487
- 2021
- 2096
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Dive into the research topics of 'Detection of Fe I Emission in the Dayside Spectrum of WASP-33b'. Together they form a unique fingerprint.Student theses
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High resolution Doppler spectroscopy of a transiting ultra-hot Jupiter at optical wavelengths
Merritt, S. (Author), Gibson, N. (Supervisor), Watson, C. (Supervisor) & de Mooij, E. (Supervisor), Dec 2021Student thesis: Doctoral Thesis › Doctor of Philosophy
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