We present the discovery of a candidate substellar companion from a survey of nearby , young stars with the NICMOS coronagraph on the Hubble Space Telescope .
The H \approx 12 mag object was discovered approximately 4 \arcsec from the young A0V star HR 7329 .
Using follow-up spectroscopy from STIS , we derive a spectral type between M7V and M8V with an effective temperature of \sim 2600 K. We estimate that the probability of a chance alignment with a foreground dwarf star of this nature is \sim 10 ^ { -8 } and therefore suggest the object ( HR 7329B ) is physically associated with HR 7329 with a projected separation of 200 AU .
Current brown dwarf cooling models indicate a mass of less than 50 Jupiter masses for HR 7329B based on age estimates of \leq 30 Myr for HR7329A .