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Continuum reverberation mapping probes the sizescale of the opticalcontinuum-emitting region in active galactic nuclei (AGN). Through 3 years ofmultiwavelength photometric monitoring in the optical with roboticobservatories, we perform continuum reverberation mapping on Mrk~876. Allwavebands show large amplitude variability and are well correlated. Slowvariations in the light curves broaden the cross-correlation function (CCF)significantly, requiring detrending in order to robustly recover interbandlags. We measure consistent interband lags using three techniques (CCF,JAVELIN, PyROA), with a lag of around 13~days from $u$ to $z$. These lags arelonger than the expected radius of 12~days for the self-gravitating radius ofthe disk. The lags increase with wavelength roughly following $\lambda^{4/3}$,as would be expected from thin disk theory, but the lag normalization isapproximately a factor of 3 longer than expected, as has also been observed inother AGN. The lag in the $i$ band shows an excess which we attribute tovariable H$\alpha$ broad-line emission. A flux-flux analysis shows a variablespectrum that follows $f_\nu \propto \lambda^{-1/3}$ as expected for a disk,and an excess in the $i$ band that also points to strong variable H$\alpha$emission in that band.

Continuum Reverberation Mapping of Mrk 876 Over Three Years With Remote Robotic Observatories