| Abstract : | Very Low Luminosity Objects (VeLLOs) are deeply embedded protostars with an intrinsic luminosity of less than 0.1 times solar luminosity. They are considered to be the precursors of low-mass stars or substellar objects in the quiescent phases of a cycle of episodic mass accretion. Many VeLLOs are associated with strong outflows, indicating the previous existence of massive accretion. Indirect chemical tracers, such as line emission from N2H+ and CO isotopologues, have been used to investigate the occurrence of episodic accretion in VeLLOs. We present the first direct spectroscopic evidence of the FU-or-like outburst in a VeLLO. Young stellar object, SSTgbs J21470601+4739394, previously classified as a very low luminosity object, was discovered to have an increasing mid-IR light curve by Park et al., 2021. Our follow up observations with Gemini/GNIRS (R=1700) confirmed the object's binarity and found diffused emission in the vicinity. The characteristics of the spectrum, taken close to the maximum point in the light curve, resemble those of young stellar objects in a high-accretion state. We identify this object as a bonafide FU-or and conduct a comprehensive spectroscopic and photometric analysis. |
