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We observed two full orbital phase curves of the transiting brown dwarfKELT-1b, at 3.6um and 4.5um, using the Spitzer Space Telescope. Combined withprevious eclipse data from Beatty et al. (2014), we strongly detect KELT-1b'sphase variation as a single sinusoid in both bands, with amplitudes of$964\pm36$ ppm at 3.6um and $979\pm54$ ppm at 4.5um, and confirm the secondaryeclipse depths measured by Beatty et al. (2014). We also measure noticeableEastward hotspot offsets of $28.4\pm3.5$ degrees at 3.6um and $18.6\pm5.2$degrees at 4.5um. Both the day-night temperature contrasts and the hotspotoffsets we measure are in line with the trends seen in hot Jupiters (e.g.,Crossfield 2015), though we disagree with the recent suggestion of an offsettrend by Zhang et al. (2018). Using an ensemble analysis of Spitzer phasecurves, we argue that nightside clouds are playing a noticeable role inmodulating the thermal emission from these objects, based on: 1) the lack of aclear trend in phase offsets with equilibrium temperature, 2) the sharpday-night transitions required to have non-negative intensity maps, which alsoresolves the inversion issues raised by Keating & Cowan (2017), 3) the factthat all the nightsides of these objects appear to be at roughly the sametemperature of 1000K, while the dayside temperatures increase linearly withequilibrium temperature, and 4) the trajectories of these objects on a Spitzercolor-magnitude diagram, which suggest colors only explainable via nightsideclouds.

Spitzer Phase Curves of KELT-1b and the Signatures of Nightside Clouds in Thermal Phase Observations