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We present high angular resolution observations of the Class 0 protostarIRAM04191+1522, using the Submillimeter Array (SMA). The SMA 1.3 mm continuumimages reveal within IRAM04191+1522 two distinct sources with an angularseparation of 7.8\,$\pm$\,0.2$"$. The two continuum sources are located in thesoutheast-northwest direction, with total gas masses of about 0.011 M_sun andabout 0.005 M_sun, respectively. The southeastern source, associated with aninfrared source seen in the Spitzer images, is the well-known Class 0 protostarwith a bolometric luminosity of about 0.08 L_sun. The newly-discoverednorthwestern continuum source is not visible in the Spitzer images atwavelengths from 3.6 to 70 micron, and has an extremely low bolometricluminosity (< 0.03 L_sun). Complementary IRAM N2H+(1-0) data that probe thedense gas in the common envelope suggest that the two sources were formedthrough the rotational fragmentation of an elongated dense core. Furthermore,comparisons between IRAM04191+1522 and other protostars suggest that most coreswith binary systems formed therein have ratios of rotational energy togravitational energy $\beta_{\rm rot}$ > 1%. This is consistent withtheoretical simulations and indicates that the level of rotational energy in adense core plays an important role in the fragmentation process.

Discovery of A Binary System in IRAM 04191+1522