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We present VRIJHK photometry of the KH 15D T Tauri binary system for the2015/16 and 2016/17 observing seasons. For the first time in the modern (CCD)era we are seeing Star B fully emerge from behind the trailing edge of theprecessing circumbinary ring during each apastron passage. We are, therefore,able to measure its luminosity and color. Decades of photometry on the systemnow allow us to infer the effective temperature, radius, mass and age of eachbinary component. We find our values to be in good agreement with previousstudies, including archival photographic photometry from the era when bothstars were fully visible, and they set the stage for a full model of the systemthat can be constructed once radial velocity measurements are available. Wealso present the first high sensitivity radio observations of the system, takenwith ALMA and the SMA. The respective 2.0 and 0.88 mm observations provide anupper limit on the circumbinary (gas and dust) disk mass of 1.7 Jupiter massesand reveal an extended CO outflow which overlaps with the position, systemicvelocity and orientation of the KH 15D system and is certainly associated withit. The low velocity, tight collimation, and extended nature of the emissionsuggest that the outflow is inclined nearly orthogonal to the line of sight,implying it is also orthogonal to the circumbinary ring. The position angle ofthe radio outflow also agrees precisely with the direction of polarization ofthe optical emission during the faint phase. A small offset between the opticalimage of the binary and the central line of the CO outflow remains as a puzzleand possible clue to the jet launching mechanism.

Optical and Radio Observations of the T Tauri Binary KH 15D (V582 Mon): Stellar Properties, Disk Mass Limit and Discovery of a CO Outflow