Program: GN-2009A-Q-20

We propose to obtain a series of follow-up observations of a candidate planetary mass companion that we have recently discovered around a solar mass star in the Upper Scorpius star-forming region. The proposed observations include 1) AO imaging at new epochs to verify the common proper motion of the candidate companion with the star, 2) high-contrast angular differential imaging to search for additional fainter and/or closer-in sources around the star, 3) J-band spectroscopy to complete the near-infrared spectrum, and 4) 3-4 microns AO imaging to constrain the SED of the candidate companion. These observations are necessary to clarify the nature of this object - improve estimates of its effective temperature, surface gravity and mass - and verify its status as a companion.