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Young giant exoplanets are a unique laboratory for understanding cool,low-gravity atmospheres. A quintessential example is the massive extrasolarplanet $\beta$ Pic b, which is 9 AU from and embedded in the debris disk of theyoung nearby A6V star $\beta$ Pictoris. We observed the system with first lightof the Magellan Adaptive Optics (MagAO) system. In Paper I we presented thefirst CCD detection of this planet with MagAO+VisAO. Here we present fourMagAO+Clio images of $\beta$ Pic b at 3.1 $\mu$m, 3.3 $\mu$m, $L^\prime$, and$M^\prime$, including the first observation in the fundamental CH$_4$ band. Toremove systematic errors from the spectral energy distribution (SED), were-calibrate the literature photometry and combine it with our own data, for atotal of 22 independent measurements at 16 passbands from 0.99--4.8 $\mu$m.Atmosphere models demonstrate the planet is cloudy but are degenerate ineffective temperature and radius. The measured SED now covers $>$80\% of theplanet's energy, so we approach the bolometric luminosity empirically. Wecalculate the luminosity by extending the measured SED with a blackbody andintegrating to find log($L_{bol}$/$L_{Sun}$) $= -3.78\pm0.03$. From ourbolometric luminosity and an age of 23$\pm$3 Myr, hot-start evolutionary tracksgive a mass of 12.7$\pm$0.3 $M_{Jup}$, radius of 1.45$\pm$0.02 $R_{Jup}$, and$T_{eff}$ of 1708$\pm$23 K (model-dependent errors not included). Ourempirically-determined luminosity is in agreement with values from atmosphericmodels (typically $-3.8$ dex), but brighter than values from the field-dwarfbolometric correction (typically $-3.9$ dex), illustrating the limitations incomparing young exoplanets to old brown dwarfs.

astrophysical journal/the astrophysical journal

Magellan Adaptive Optics first-light observations of the exoplanet beta  Pic b. II. 3-5 micron direct imaging with MagAO+Clio, and the empirical  bolometric luminosity of a self-luminous giant planet