Detection of the phase curve and occultation of WASP-100b with TESS

Abstract

We report the detection of the full orbital phase curve and occultation of the hot-Jupiter WASP-100b using TESS photometry. The phase curve is isolated by suppressing low frequency stellar and instrumental modes using both a non-parametric harmonic notch filter (phasma) and semi-sector long polynomials. This yields a phase curve signal of (73 +/- 9) ppm amplitude, preferred over a null-model by deltaBIC = 25, indicating very strong evidence for an observed effect. We recover the occultation event with a suite of five temporally localized tools, including Gaussian processes and cosine filtering. This allows us to infer an occultation depth of (100 +/- 14) ppm, with an additional +/- 16 ppm systematic error from the differences between methods. We regress a model including atmospheric reflection, emission, ellipsoidal variations and Doppler beaming to the combined phase curve and occultation data. This allows us to infer that WASP-100b has a geometric albedo of A_g = 0.16 (+0.04, -0.03) in the TESS bandpass, with a maximum dayside brightness temperature of (2710 +/- 100) K and a warm nightside temperature of (2380 [+170, -200]) K. Additionally, we find evidence that WASP-100b has a high thermal redistribution efficiency, manifesting as a substantial eastward hotspot offset of (71 [+2, -4]) degrees. These results present the first measurement of a thermal phase shift among the phase curves observed by TESS so far, and challenge the predicted efficiency of heat transport in the atmospheres of ultra-hot Jupiters.

14 pages, 6 figures, 3 tables. Accepted for publication by MNRAS

References in corpus (8)

• The Transiting Exoplanet Survey Satellite
• The effect of red noise on planetary transit detection
• A New 24 micron Phase Curve for upsilon Andromedae b
• A Semi-Analytical Model of Visible-Wavelength Phase Curves of Exoplanets and Applications to Kepler-7 b and Kepler-10 b
• Phase Offsets and the Energy Budgets of Hot Jupiters
• Low albedos of hot to ultra-hot Jupiters in the optical to near-infrared transition regime
• $TESS$ Phase Curve of the Hot Jupiter WASP-19b
• The full $Kepler$ phase curve of the eclipsing hot white dwarf binary system KOI-964

Cited by in corpus (13)

• Hot Jupiters: Origins, Structure, Atmospheres
• Aerosols in Exoplanet Atmospheres
• Atmospheric Regimes and Trends on Exoplanets and Brown Dwarfs
• Systematic Phase Curve Study of Known Transiting Systems from Year 1 of the TESS Mission
• Visible-light Phase Curves from the Second Year of the TESS Primary Mission
• Simulating gas giant exoplanet atmospheres with Exo-FMS: Comparing semi-grey, picket fence and correlated-k radiative-transfer schemes
• TESS unveils the phase curve of WASP-33b. Characterization of the planetary atmosphere and the pulsations from the star
• The TESS Phase Curve of KELT-1b Suggests a High Dayside Albedo
• On spectroscopic phase-curve retrievals: H2 dissociation and thermal inversion in the atmosphere of the ultra-hot Jupiter WASP-103 b
• Phase Modeling of the TRAPPIST-1 Planetary Atmospheres
• Reflected-light Phase Curves with PICASO: A Kepler-7b Case Study
• TESS Unveils the Full Phase Curve of WASP-19b
• TESS unveils the optical phase curve of KELT-1b. Thermal emission and ellipsoidal variation from the brown dwarf companion, and activity from the star