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We performed an intensive accretion disk reverberation mapping campaign onthe high accretion rate active galactic nucleus Mrk 142 in early 2019. Mrk 142was monitored with the Neil Gehrels Swift Observatory for 4 months in X-raysand 6 UV/optical filters. Ground-based photometric monitoring was obtained fromthe Las Cumbres Observatory, Liverpool Telescope and Dan Zowada MemorialObservatory in ugriz filters and the Yunnan Astronomical Observatory in V. Mrk142 was highly variable throughout, displaying correlated variability acrossall wavelengths. We measure significant time lags between the differentwavelength light curves, finding that through the UV and optical thewavelength-dependent lags, $\tau(\lambda)$, generally follow the relation$\tau(\lambda) \propto \lambda^{4/3}$, as expected for the $T\propto R^{-3/4}$profile of a steady-state optically-thick, geometrically-thin accretion disk,though can also be fit by $\tau(\lambda) \propto \lambda^{2}$, as expected fora slim disk. The exceptions are the u and U band, where an excess lag isobserved, as has been observed in other AGN and attributed to continuumemission arising in the broad-line region. Furthermore, we perform a flux-fluxanalysis to separate the constant and variable components of the spectralenergy distribution, finding that the flux-dependence of the variable componentis consistent with the $f_\nu\propto\nu^{1/3}$ spectrum expected for ageometrically-thin accretion disk. Moreover, the X-ray to UV lag issignificantly offset from an extrapolation of the UV/optical trend, with theX-rays showing a poorer correlation with the UV than the UV does with theoptical. The magnitude of the UV/optical lags is consistent with a highlysuper-Eddington accretion rate.

Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142