2000ApJ...541..390L

We present the discovery of a candidate substellar companion from a survey of nearby young stars made with the Near-Infrared Camera and Multiobject Spectrometer coronagraph on the Hubble Space Telescope. The H~12 mag object was discovered approximately 4" from the young A0 V star HR 7329. Using follow-up spectroscopy from the Space Telescope Imaging Spectrograph, we derive a spectral type between M7 V and M8 V 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 we suggest that 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 M_Jup for HR 7329B based on age estimates of ≤30 Myr for HR 7329A.