A comprehensive reanalysis of <i>Spitzer</i>’s 4.5 ?m phase curves, and the phase variations of the ultra-hot Jupiters MASCARA-1b and KELT-16b

ABSTRACT We have developed an open-source pipeline for the analysis of Spitzer/IRAC channel 1 and 2 time-series photometry, incorporating some most popular decorrelation methods. applied this to new phase curve observations ultra-hot Jupiters MASCARA-1b KELT-16b, we performed first comprehensive reanalysis 15 curves. find that KELT-16b offsets $6^{+11}_{-11}~^{\circ }$W $38^{+16}_{-15}~^{\circ }$W, dayside temperatures $2952^{+100}_{-97}$ $3070^{+160}_{-150}$ K, nightside $1300^{+340}_{-340}$ $1900^{+430}_{-440}$ respectively. confirm a strong correlation between irradiation with shallower dependence temperature. also evidence normalized amplitude (peak-to-trough divided by eclipse depth) is correlated stellar effective In addition, while our different models often retrieve similar parameters, significant differences occasionally arise them, as well preferred model literature values. Nevertheless, are consistent published within ?8 ± 21 degrees (?1.6 3.2 sigma), amplitudes on average reproduced ?0.01 0.24 (?0.1 1.6 sigma). Finally, BLISS performs best in cases, but not all; therefore recommend future analyses consider numerous detector ensure optimal fit assess dependencies.