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We report observations of the nova RS Ophiuchi (RS Oph) using the KeckInterferometer Nuller (KIN), approximately 3.8 days following the most recentoutburst that occurred on 2006 February 12. These observations represent thefirst scientific results from the KIN, which operates in N-band from 8 to 12.5microns in a nulling mode. By fitting the unique KIN data, we have obtained anangular size of the mid-infrared continuum of 6.2, 4.0, or 5.4 mas for a diskprofile, gaussian profile (FWHM), and shell profile respectively. The data showevidence of enhanced neutral atomic hydrogen emission and atomic metalsincluding silicon located in the inner spatial regime near the white dwarf (WD)relative to the outer regime. There are also nebular emission lines andevidence of hot silicate dust in the outer spatial region, centered at ! 17 AUfrom the WD, that are not found in the inner regime. Our evidence suggests thatthese features have been excited by the nova flash in the outer spatial regimebefore the blast wave reached these regions. These identifications support amodel in which the dust appears to be present between outbursts and is notcreated during the outburst event. We further discuss the present results interms of a unifying model of the system that includes an increase in density inthe plane of the orbit of the two stars created by a spiral shock wave causedby the motion of the stars through the cool wind of the red giant star. Thesedata show the power and potential of the nulling technique which has beendeveloped for the detection of Earth-like planets around nearby stars for theTerrestrial Planet Finder Mission and Darwin missions.

Milliarcsecond N-Band Observations of the Nova RS Ophiuchi: First Science with the Keck Interferometer Nuller