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The Type IIn supernova SN 2010jl was relatively nearby and luminous, allowingdetailed studies of the near-infrared (NIR) emission. We present 1 - 2.4 micronspectroscopy over the age range of 36 - 565 days from the earliest detection ofthe supernova. On day 36, the H lines show an unresolved narrow emissioncomponent along with a symmetric broad component that can be modeled as theresult of electron scattering by a thermal distribution of electrons. Over thenext hundreds of days, the broad components of the H lines shift to the blue by700 km/s, as is also observed in optical lines. The narrow lines do not show ashift, indicating they originate in a different region. He I 1.0830 and 2.0587micron lines both show an asymmetric broad emission component, with a shoulderon the blue side that varies in prominence and velocity from -5500 km/s on day108 to -4000 km/s on day 219. This component may be associated with the highervelocity flow indicated by X-ray observations of the supernova. The absence ofthe feature in the H lines suggests that this is from a He rich ejecta flow.The He I 1.0830 micron feature has a narrow P Cygni line, with absorptionextending to ~100 km/s and strengthening over the first 200 days, and anemission component which weakens with time. At day 403, the continuum emissionbecomes dominated by a blackbody spectrum with a temperature of ~1900 K,suggestive of dust emission.

Near infrared spectroscopy of the type IIn SN 2010jl: evidence for high velocity ejecta