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We present multi-epoch optical and near-infrared (NIR) photometry andspectroscopy of the spectroscopic binary T Tauri star DQ Tau. The photometricmonitoring, obtained using SMARTS ANDICAM, recovers the previously-seencorrelation between optical flux and the 15.8-day binary orbital period, withblue flux peaks occurring close to most observed periastron passages. For thefirst time, we find an even more consistent correlation between orbital periodand NIR brightness and color. The onset of pulse events in the NIR on averageprecedes those in the optical by a few days, with the rise usually startingnear apastron orbital phase. We further obtained five epochs of spectroscopyusing IRTF SpeX, with a wavelength range of 0.8 to 5 microns, and derivedspectra of the infrared excess emission. The shape and strength of the excessvaries with time, with cooler and weaker characteristic dust emission (T ~1100-1300 K) over most of the binary orbit, and stronger/warmer dust emission(T ~ 1600 K, indicative of dust sublimation) just before periastron passage. Wesuggest our results are broadly consistent with predictions of simulations ofdisk structure and accretion flows around close binaries, with the varying dustemission possibly tracing the evolution of accretion streams falling inwardsthrough a circumbinary disk cavity and feeding the accretion pulses traced bythe optical photometry and NIR emission lines. However, our results also showmore complicated behavior that is not fully explained by this simple picture,and will require further observations and modeling to fully interpret.

The Inner Disk and Accretion Flow of the Close Binary DQ Tau