Other
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114..301j&link_type=abstract
Astronomical Journal v.114, p. 301-316 (1997)
Other
76
Scientific paper
Combining new infrared photometry with data in the literature, we have compiled spectral energy distributions (SEDs) from optical to millimeter wavelengths for four low-mass pre-main-sequence spectroscopic binaries (a < 1 AU) showing infrared excesses. Three of these binaries have small or no excess emission at lambda = 1-5 \micron\ but large excess emission at longer wavelengths, suggesting cleared regions within circumbinary disks. The inferred sizes of these gaps or holes are consistent with theoretical predictions for dynamical clearing by stellar companions. In contrast, the binary AK Sco has a power-law SED with no evidence of reduced near-infrared emission. Nonetheless, a strong 9.8 \micron silicate emission feature suggests the presence of optically thin dust, and the near-infrared emission can be produced by very small amounts ( ~ 10(-9) \msun) of material within a gap or hole. Thus a dynamically cleared region may exist in AK Sco but is not required by the data. That three of these binaries (and several other short-period pre-main-sequence binaries) have near-infrared excesses indicative of hot material near the stars is significant given that circumstellar disk radii are limited to less than 0.06 AU (or several stellar radii). The spatial distribution of the near-infrared-emitting material may not be disk-like. Continued replenishment is necessary, perhaps from circumbinary disks. Circumbinary disk masses around short-period pre-main-sequence binaries range from 0.06 \msun\ to less than 10(-4) \msun. The larger disk masses are sufficient to substantially influence the binaries' orbital eccentricities during their pre-main-sequence lifetimes.
Jensen Eric L. N.
Mathieu Robert D.
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