TESS phase curve of ultra-hot Jupiter WASP-189 b
arXiv:2512.05175 · doi:10.1051/0004-6361/202557139
Abstract
The thermal structures of highly irradiated ultra-hot Jupiters can deviate substantially from those of cooler hot Jupiters. For planets orbiting rapidly rotating, and consequently oblate, host stars, photometric light curves provide a unique opportunity to measure the spin-orbit angle. Moreover, in systems with significant spin-orbit misalignment, the stellar oblateness can induce observable orbital precession. We wish to study the atmosphere and orbital architecture of an ultra-hot Jupiter WASP-189 b, orbiting around a hot A-type star. We use the photometric phase curves and gravity-darkened transits of WASP-189 b observed with the Transiting Exoplanet Survey Satellite (TESS), complemented with the archival observations from CHaracterising ExOPlanet Satellite (CHEOPS). We detected a phase curve signal with significant occultation depth of 203.4 (+16.2) (-16.3) ppm, while the nightside flux, -71.8 (+36.4) (-36.0) ppm, is consistent with zero at 2-sigma. We invert the phase curve signal to construct the temperature map of the planet. The map was subsequently used to estimate the Bond albedo and heat redistribution efficiency, the expected median ranges of which are found to be 0.19-0.35 and 0.09-0.41, respectively. Finally, we analysed gravity-darkened transits to find that the planet is in polar orbit with the spin-orbit angle of 89.46 (+1.08) (-1.08) deg. We found no hint of orbital precession while comparing our results with those from the literature. Our observations, together with atmospheric modelling, suggest that the dayside emission of WASP-189 b in TESS and CHEOPS bandpasses is dominated by thermal emission from an atmosphere with extremely inefficient heat transport and negligible contribution from reflected light.
arXiv comment13 pages, 6 + 2 figures, 2 tables, accepted for publication in A&A
References in corpus (51)
- dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
- A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
- Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
- Fast and scalable Gaussian process modeling with applications to astronomical time series
- Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
- The Statistics of Albedo and Heat Recirculation on Hot Exoplanets
- Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy
- From thermal dissociation to condensation in the atmospheres of ultra hot Jupiters: WASP-121b in context
- Dynamic nested sampling: an improved algorithm for parameter estimation and evidence calculation
- H- Opacity and Water Dissociation in the Dayside Atmosphere of the Very Hot Gas Giant WASP-18 b
- The CHEOPS mission
- Spitzer Secondary Eclipses of the Dense, Modestly-irradiated, Giant Exoplanet HAT-P-20b Using Pixel-Level Decorrelation
- Extremely Irradiated Hot Jupiters: Non-Oxide Inversions, H- Opacity, and Thermal Dissociation of Molecules
- EVEREST: Pixel Level Decorrelation of K2 Light curves
- PyTransit: Fast and Easy Exoplanet Transit Modelling in Python
- Inverting Phase Functions to Map Exoplanets
- Atmospheric Circulation of Hot Jupiters: Dayside-Nightside Temperature Differences
- HELIOS: An Open-source, GPU-accelerated Radiative Transfer Code For Self-consistent Exoplanetary Atmospheres
- Atmospheric Dynamics of Hot Exoplanets
- Increased Heat Transport in Ultra-Hot Jupiter Atmospheres Through H Dissociation/Recombination
- A reflective, metal-rich atmosphere for GJ 1214b from its JWST phase curve
- A broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b
- Self-luminous and irradiated exoplanetary atmospheres explored with HELIOS
- Transit Lightcurves of Extrasolar Planets Orbiting Rapidly-Rotating Stars
- The Peculiar Atmospheric Chemistry of KELT-9b
- Titanium oxide and chemical inhomogeneity in the atmosphere of the exoplanet WASP-189b
- FastChem 2: An improved computer program to determine the gas-phase chemical equilibrium composition for arbitrary element distributions
- The hot dayside and asymmetric transit of WASP-189b seen by CHEOPS
- A HST/WFC3 Thermal Emission Spectrum of the Hot Jupiter HAT-P-7b
- Evidence for a Dayside Thermal Inversion and High Metallicity for the Hot Jupiter WASP-18b
- Empirical limb-darkening coefficients & transit parameters of known exoplanets from TESS
- Uniformly hot nightside temperatures on short-period gas giants
- Detection of a Westward Hotspot Offset in the Atmosphere of a Hot Gas Giant CoRoT-2b
- A unique hot Jupiter spectral sequence with evidence for compositional diversity
- Measurement of the Nodal Precession of WASP-33 b via Doppler Tomography
- Evidence for H Dissociation and Recombination Heat Transport in the Atmosphere of KELT-9b
- Spin-orbit resonance, transit duration variation and possible secular perturbations in KOI-13
- The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve
- Spin-Orbit Angles of Kepler-13Ab and HAT-P-7b from Gravity-Darkened Transit Light Curves
- Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection
- Time-resolved transmission spectroscopy of the ultra-hot Jupiter WASP-189 b
- Detection of CO emission lines in the dayside atmospheres of WASP-33b and WASP-189b with GIANO
- JWST reveals a rapid and strong day side variability of 55 Cancri e
- Closed-formed ab initio solutions of geometric albedos and reflected light phase curves of exoplanets
- The stable climate of KELT-9b
- An atlas of resolved spectral features in the transmission spectrum of WASP-189 b with MAROON-X
- Nodal Precession and Tidal Evolution of Two Hot-Jupiters: WASP-33 b and KELT-9 b
- Nodal Precession of WASP-33b for Eleven Years by Doppler Tomographic and Transit Photometric Observations
- Physically-motivated basis functions for temperature maps of exoplanets
- Dark skies of the slightly eccentric WASP-18 b from its optical-to-infrared dayside emission
- Hydride ion continuum hides absorption signatures in the NIRPS near-infrared transmission spectrum of the ultra-hot gas giant WASP-189b