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 ~ 12 mag object was discovered approximately 4" 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 ~ 2600 K. We estimate that the probability of a chance alignment with a foreground dwarf star of this nature is ~ 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 < 30 Myr for HR7329A.
@article{arxiv.astro-ph/0005047,
title = {A Candidate Substellar Companion to HR 7329},
author = {P. J. Lowrance and G. Schneider and J. D. Kirkpatrick and E. E. Becklin and A. J. Weinberger and B. Zuckerman and P. Plait and E. Malmuth and S. Heap and A. Schultz and B. A. Smith and R. J. Terrile and D. C. Hines},
journal= {arXiv preprint arXiv:astro-ph/0005047},
year = {2009}
}