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We used the Magellan adaptive optics system to image the 11 Myr substellarcompanion 1RXS 1609 B at the bluest wavelengths to date (z' and Ys). Comparisonwith synthetic spectra yields a higher temperature than previous studies of$T_\mathrm{eff}=2000\pm100\mathrm{K}$ and significant dust extinction of$A_V=4.5^{+0.5}_{-0.7}$ mag. Mass estimates based on the DUSTY tracks gives0.012-0.015 Msun, making the companion likely a low-mass brown dwarf surroundedby a dusty disk. Our study suggests that 1RXS 1609 B is one of the 25% of UpperScorpius low-mass members harboring disks, and it may have formed like a starand not a planet out at 320 AU.

New Extinction and Mass Estimates of the Low-mass Companion 1RXS 1609 B with the Magellan AO System: Evidence of an Inclined Dust Disk