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Thermal phase curves of short period exoplanets provide the best constraintson the atmospheric dynamics and heat transport in their atmospheres. Thepublished Spitzer Space Telescope phase curve of 55 Cancri e, an ultra-shortperiod super-Earth, exhibits a large phase offset suggesting significanteastward heat recirculation, unexpected on such a hot planet arXiv:1604.05725.We present our re-reduction and analysis of these iconic observations using theopen source and modular Spitzer Phase Curve Analysis (SPCA) pipeline. Inparticular, we attempt to reproduce the published analysis using the sameinstrument detrending scheme as the original authors. We retrieve the daysidetemperature ($T_{\rm day} = 3771^{+669}_{-520}$ K), nightside temperature($T_{\rm night} < 1649$ K at $2\sigma$), and longitudinal offset of theplanet's hot spot and quantify how they depend on the reduction and detrending.Our re-analysis suggests that 55 Cancri e has a negligible hot spot offset of$-12^{+21}_{-18}$ degrees east. The small phase offset and cool nightside areconsistent with the poor heat transport expected on ultra-short period planets.The high dayside 4.5-micrometer brightness temperature is qualitativelyconsistent with SiO emission from an inverted rock vapour atmosphere.

Revisiting the Iconic Spitzer Phase Curve of 55 Cancri e: Hotter Dayside, Cooler Nightside and Smaller Phase Offset