Observed spectral energy distribution of the thermal emission from the dayside of WASP-46b

Chen, G.; Boekel, R. van; Wang, H.; Nikolov, Nikolay; Seemann, U.; Henning, Th.

doi:10.1051/0004-6361/201423795

Cited by 11 publications

(9 citation statements)

References 42 publications

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“…For WASP-46b, we measure an eclipse depth of 0.26 +0.05 −0.03 %, and e cos ω = 0.004 +0.004 −0.004 , as measured from two full eclipse observations. The Ks band eclipse has previously been measured by Chen et al (2014c), with a reported depth of 0.253 +0.063 −0.060 %, consistent with our measurement to better than 1σ. Chen et al (2014c) also measured the J and H band eclipses using GROND on the ESO 2.2m.…”

Section: Resultssupporting

confidence: 92%

Secondary eclipse observations for seven hot-Jupiters from the Anglo-Australian Telescope

Zhou

Bayliss

Kedziora-Chudczer

et al. 2015

Mon. Not. R. Astron. Soc.

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We report detections and constraints for the near infrared Ks band secondary eclipses of seven hot-Jupiters using the IRIS2 infrared camera on the Anglo-Australian Telescope. Eclipses in the Ks band for WASP-18b and WASP-36b have been measured for the first time. We also present new measurements for the eclipses of WASP-4b, WASP-5b, and WASP-46b, as well as upper limits for the eclipse depths of WASP-2b and WASP-76b. In particular, two full eclipses of WASP-46b were observed, allowing us to demonstrate the repeatability of our observations via independent analyses on each eclipse. Significant numbers of eclipse depths for hot-Jupiters have now been measured in both Ks and the four Spitzer IRAC bandpasses. We discuss these measurements in the context of the broadband colours and brightness temperatures of the hot-Jupiter atmosphere distribution. Specifically, we re-examine the proposed temperature dichotomy between the most irradiated, and mildly irradiated planets. We find no evidence for multiple clusters in the brightness temperature equilibrium temperature distributions in any of these bandpasses, suggesting a continuous distribution of heat re-emission and circulation characteristics for these planets.

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Section: Resultssupporting

confidence: 92%

Secondary eclipse observations for seven hot-Jupiters from the Anglo-Australian Telescope

Zhou

Bayliss

Kedziora-Chudczer

et al. 2015

Mon. Not. R. Astron. Soc.

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“…Moreover, the WASP light curve shows a photometric modulation, which allowed the measurement of the rotation period of the star, and a gyrochronological age of the system of 1.4 Gyr. By observing the secondary eclipse of the planet, Chen et al (2014b) detected the emission from the day-side atmosphere finding brightness temperatures consistent with a low heat redistribution efficiency.…”

Section: Wasp-46mentioning

confidence: 99%

Physical properties of the planetary systems WASP-45 and WASP-46 from simultaneous multiband photometry

Ciceri

Mancini

Southworth

et al. 2015

Mon. Not. R. Astron. Soc.

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Accurate measurements of the physical characteristics of a large number of exoplanets are useful to strongly constrain theoretical models of planet formation and evolution, which lead to the large variety of exoplanets and planetary-system configurations that have been observed. We present a study of the planetary systems WASP-45 and WASP-46, both composed of a mainsequence star and a close-in hot Jupiter, based on 29 new high-quality light curves of transits events. In particular, one transit of WASP-45 b and four of WASP-46 b were simultaneously observed in four optical filters, while one transit of WASP-46 b was observed with the NTT obtaining a precision of 0.30 mmag with a cadence of roughly 3 min. We also obtained five new spectra of WASP-45 with the FEROS spectrograph. We improved by a factor of 4 the measurement of the radius of the planet WASP-45 b, and found that WASP-46 b is slightly less massive and smaller than previously reported. Both planets now have a more accurate measurement of the density (0.959 ± 0.077 ρ Jup instead of 0.64 ± 0.30 ρ Jup for WASP-45 b, and 1.103 ± 0.052 ρ Jup instead of 0.94 ± 0.11 ρ Jup for WASP-46 b). We tentatively detected radius variations with wavelength for both planets, in particular in the case of WASP-45 b we found a slightly larger absorption in the redder bands than in the bluer ones. No hints for the presence of an additional planetary companion in the two systems were found either from the photometric or radial velocity measurements.

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“…The limited results from ground-based occultation observations in the optical and near-ultraviolet include similar non-detections (e.g. Chen et al 2014;Hooton et al 2018), but also disagreeing results that are challenging to interpret (a full discussion is contained in Hooton et al 2019). Precise occultation observations of a greater number of hot Jupiters at multiple wavelengths are required to further understand the atmospheric processes shaping the reflective properties of these extreme planets.…”

Section: Introductionmentioning

confidence: 99%

Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection

Hooton

Hoyer

Kitzmann³

et al. 2022

A&A

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Context. The light curves of tidally locked hot Jupiters transiting fast-rotating, early-type stars are a rich source of information about both the planet and star, with full-phase coverage enabling a detailed atmospheric characterisation of the planet. Although it is possible to determine the true spin–orbit angle Ψ – a notoriously difficult parameter to measure – from any transit asymmetry resulting from gravity darkening induced by the stellar rotation, the correlations that exist between the transit parameters have led to large disagreements in published values of Ψ for some systems. Aims. We aimed to study these phenomena in the light curves of the ultra-hot Jupiter MASCARA-1 b, which is characteristically similar to well-studied contemporaries such as KELT-9 b and WASP-33 b. Methods. We obtained optical CHaracterising ExOPlanet Satellite (CHEOPS) transit and occultation light curves of MASCARA-1 b, and analysed them jointly with a Spitzer/IRAC 4.5 μm full-phase curve to model the asymmetric transits, occultations, and phase-dependent flux modulation. For the latter, we employed a novel physics-driven approach to jointly fit the phase modulation by generating a single 2D temperature map and integrating it over the two bandpasses as a function of phase to account for the differing planet–star flux contrasts. The reflected light component was modelled using the general ab initio solution for a semi-infinite atmosphere. Results. When fitting the CHEOPS and Spitzer transits together, the degeneracies are greatly diminished and return results consistent with previously published Doppler tomography. Placing priors informed by the tomography achieves even better precision, allowing a determination of Ψ = 72.1−2.4+2.5 deg. From the occultations and phase variations, we derived dayside and nightside temperatures of 3062−68+66 K and 1720 ± 330 K, respectively.Our retrieval suggests that the dayside emission spectrum closely follows that of a blackbody. As the CHEOPS occultation is too deep to be attributed to blackbody flux alone, we could separately derive geometric albedo Ag = 0.171−0.068+0.066 and spherical albedo As = 0.266−0.100+0.097 from the CHEOPS data, and Bond albedoAB = 0.057−0.101+0.083 from the Spitzer phase curve.Although small, the Ag and As indicate that MASCARA-1 b is more reflective than most other ultra-hot Jupiters, where H− absorption is expected to dominate. Conclusions. Where possible, priors informed by Doppler tomography should be used when fitting transits of fast-rotating stars, though multi-colour photometry may also unlock an accurate measurement of Ψ. Our approach to modelling the phase variations at different wavelengths provides a template for how to separate thermal emission from reflected light in spectrally resolved James Webb Space Telescope phase curve data.

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Observed spectral energy distribution of the thermal emission from the dayside of WASP-46b

Cited by 11 publications

References 42 publications

Secondary eclipse observations for seven hot-Jupiters from the Anglo-Australian Telescope

Secondary eclipse observations for seven hot-Jupiters from the Anglo-Australian Telescope

Physical properties of the planetary systems WASP-45 and WASP-46 from simultaneous multiband photometry

Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection

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