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Obliquity measurement and atmospheric characterization of the WASP-74 planetary system
- Source :
- A&A 642, A50 (2020)
- Publication Year :
- 2020
-
Abstract
- We present new transit observations of the hot Jupiter WASP-74 b ($T_\mathrm{eq} \sim$ 1860 K) using the high-resolution spectrograph HARPS-N and the multi-colour simultaneous imager MuSCAT2. We refine the orbital properties of the planet and its host star, and measure its obliquity for the first time. The measured sky-projected angle between the stellar spin-axis and the planet's orbital axis is compatible with an orbit well-aligned with the equator of the host star ($\lambda = 0.77\pm0.99 \mathrm{deg}$). We are not able to detect any absorption feature of H$\alpha$, or any other atomic spectral features, in its high-resolution transmission spectra due to low S/N at the line cores. Despite previous claims regarding the presence of strong optical absorbers such TiO and VO gases in the atmosphere of WASP-74 b, the new ground-based photometry combined with a reanalysis of previously reported observations from the literature shows a slope in the low-resolution transmission spectrum steeper than expected from Rayleigh scattering alone.<br />Comment: Accepted for publication in Astronomy & Astrophysics. 12 pages, 8 figures, 5 tables
- Subjects :
- Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Database :
- arXiv
- Journal :
- A&A 642, A50 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.2007.11851
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1051/0004-6361/202038703