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We have developed an open-source pipeline for the analysis of\textit{Spitzer}/IRAC channel 1 and 2 time-series photometry, incorporatingsome of the most popular decorrelation methods. We applied this pipeline to newphase curve observations of ultra-hot Jupiters MASCARA-1b and KELT-16b, and weperformed the first comprehensive reanalysis of 15 phase curves. We find thatMASCARA-1b and KELT-16b have phase offsets of $6^{+11}_{-11}~^{\circ}$W and$38^{+16}_{-15}~^{\circ}$W, dayside temperatures of $2952^{+100}_{-97}$ K and$3070^{+160}_{-150}$ K, and nightside temperatures of $1300^{+340}_{-340}$ Kand $1900^{+430}_{-440}$ K, respectively. We confirm a strong correlationbetween dayside and irradiation temperatures with a shallower dependency fornightside temperature. We also find evidence that the normalized phase curveamplitude (peak-to-trough divided by eclipse depth) is correlated with stellareffective temperature. In addition, while our different models often retrievesimilar parameters, significant differences occasionally arise between them, aswell as between our preferred model and the literature values. Nevertheless,our preferred models are consistent with published phase offsets to within$-8\pm21$ degrees ($-1.6\pm3.2$ sigma), and normalized phase curve amplitudesare on average reproduced to within $-0.01\pm0.24$ ($-0.1\pm1.6$ sigma).Finally, we find that BLISS performs best in most cases, but not all; wetherefore recommend future analyses consider numerous detector models to ensurean optimal fit and to assess model dependencies.

monthly notices of the royal astronomical society

A Comprehensive Reanalysis of $\textit{Spitzer}$'s 4.5 $\mu$m Phase  Curves, and the Phase Variations of the Ultra-hot Jupiters MASCARA-1b and  KELT-16b