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A point source observed 8 AU in projection from beta Pictoris in L' (3.8micron) imaging in 2003 has been recently presented as a planet candidate. Herewe show the results of L'-band adaptive optics imaging obtained at KeckObservatory in 2008. We do not detect beta Pic b beyond a limiting radius of0.29 arcsec, or 5.5 AU in projection, from the star. If beta Pic b is anorbiting planet, then it has moved >=0.12 arcsec (2.4 AU in projection) closerto the star in the five years separating the two epochs of observation. Weexamine the range of orbital parameters consistent with the observations,including likely bounds from the locations of previously inferred planetesimalbelts. We find a family of low-eccentricity orbits with semimajor axes ~8-9 AUthat are completely allowed, as well as a broad region of orbits with e<~0.2,a>~10 AU that are allowed if the apparent motion of the planet was towards thestar in 2003. We compare this allowed space with predictions of the planetaryorbital elements from the literature. Additionally, we show how similarobservations in the next several years can further constrain the space ofallowed orbits. Non-detections of the source through 2013 will exclude theinterpretation of the candidate as a planet orbiting between the 6.4 and 16 AUplanetesimal belts.

Orbital Constraints on the beta Pic Inner Planet Candidate with Keck Adaptive Optics