CHEOPS observations confirm nodal precession in the WASP-33 system

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Volume 693 (January 2025)

A&A, 693 (2025) A128

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Table 1

Stellar obliquity and transit impact parameter measurements for WASP-33 b.

Epoch (BJD_TDB-2450000)	Instrument	λ (deg)	Impact parameter	Original reference	Re-analysis reference
4758.52	TLS	−108.8 ± 1.0	0.218 ± 0.008	Collier Cameron et al. (2010)
4782.92	McD	$- {111.3}_{- 0.77}^{+ 0.76}$ $- 111.3_{ - 0.77}^{ + 0.76}$	${0.2398}_{- 0.0058}^{+ 0.0062}$ $0.2398_{ - 0.0058}^{ + 0.0062}$	Collier Cameron et al. (2010)	Watanabe et al. (2022)
5173.28	NOT	−108.4 ± 0.7	0.203 ± 0.007	Collier Cameron et al. (2010)
5853.97	Subaru	−113.96 ± 0.3	0.1578 ± 0.0027	Watanabe et al. (2020)	Watanabe et al. (2022)
6934.77	McD	−113.00 ± 0.37	0.0845 ± 0.0031	Johnson et al. (2015)	Watanabe et al. (2022)
7660.59	HARPS-N	−111.39 ± 0.23	0.0413 ± 0.0019	Borsa et al. (2021)	Watanabe et al. (2022)
7733.79	McD	$- {111.32}_{- 0.47}^{+ 0.49}$ $- 111.32_{ - 0.47}^{ + 0.49}$	0.0432 ± 0.0039	Watanabe et al. (2022)
8063.15	*OAC/MuSCAT	—	\|b\| < 0.132	Watanabe et al. (2022)
8131.46	HARPS-N	−111.46 ± 0.28	${0.0034}_{- 0.0023}^{+ 0.0024}$ $0.0034_{ - 0.0023}^{ + 0.0024}$	Borsa et al. (2021)	Watanabe et al. (2022)
8403.49	*TCS/MuSCAT2	–	\|b\| < 0.067	Watanabe et al. (2022)
8486.45	HARPS-N	−111.64 ± 0.28	$- {0.0272}_{- 0.0021}^{+ 0.0020}$ $- 0.0272_{ - 0.0021}^{ + 0.0020}$	Borsa et al. (2021)	Watanabe et al. (2022)
8804.83	PEPSI	$- {109.29}_{- 0.17}^{+ 0.2}$ $- 109.29_{ - 0.17}^{ + 0.2}$	–	Cauley et al. (2021)
8845.09	OAC/HIDES	$- {112.24}_{- 1.02}^{+ 0.97}$ $- 112.24_{ - 1.02}^{ + 0.97}$	$- {0.0592}_{- 0.0065}^{+ 0.0066}$ $- 0.0592_{ - 0.0065}^{ + 0.0066}$	Watanabe et al. (2022)
8792.63	*TESS	−94.9 ± 21.4	0.177 ± 0.039	Kálmán et al. (2022)
8792.63	*TESS	$- {109.0}_{- 20.2}^{+ 17.6}$ $- 109.0_{ - 20.2}^{ + 17.6}$	−0.12 ± 0.08	Dholakia et al. (2022)

Notes. Original reference refers to the paper where the data were first published. Values are taken from the paper listed under ‘Re-analysis reference’ where available. All measurements are made by Doppler tomography, except those marked by a * in the ‘Instrument’ column, which are photometric. Instrument abbreviations are as follows: TLS: the Coudé Échelle spectrograph on the 2-m Alfred Jensch telescope at the Thüringer Landessternwarte Tautenburg. McD: the Tull spectrograph on the 2.7-m Harlan J. Smith Telescope at McDonald Observatory, Texas. NOT: the FIES spectrograph on the 2.6-m Nordic Optical Telscope, La Palma. HARPS-N: the HARPS-N spectrograph on the 3.6-m Telescopio Nazionale Galileo, La Palma. OAC/MuSCAT: the Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets (MuSCAT) at the Okayama Astro Complex (OAC), Japan. TCS/MuSCAT2: MuSCAT2 at the Telescopio Carlos Sánchez, Tenerife. PEPSI: Potsdam Échelle Polarimetric and Spectroscopic Instrument on the 8.4-m Large Binocular Telescope, Arizona. OAC/HIDES: the HIgh Dispersion Échelle Spectrograph at the OAC. TESS: the Transiting Exoplanet Survey Satellite.

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