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Context. Ellerman bombs (EBs) are short-lived emission features,characterized by extended wing emission in hydrogen Balmer lines. Until now, nodistinct signature of EBs has been found in the He I 10830 {\AA} line, andconclusive observations of EBs in He I D 3 have never been reported. Aims. Weaim to study the signature of EBs in neutral helium triplet lines. Methods. Theobservations consist of 10 consecutive SST/TRIPPEL raster scans close to thelimb, featuring the H$\beta$, He I D3 and He I 10830 {\AA} spectral regions. Wealso obtained raster scans with IRIS and make use of the SDO/AIA 1700 {\AA}channel. We use Hazel to invert the neutral helium triplet lines. Results.Three EBs in our data show distinct emission signatures in neutral heliumtriplet lines, most prominently visible in the He I D3 line. The helium lineshave two components: a broad and blue-shifted emission component associatedwith the EB, and a narrower absorption component formed in the overlyingchromosphere. One of the EBs in our data shows evidence of strong velocitygradients in its emission component. The emission component of the other twoEBs could be fitted using a constant slab. Our analysis hints towards thermalDoppler motions having a large contribution to the broadening for helium andIRIS lines. We conclude that the EBs must have high temperatures to exhibitemission signals in neutral helium triplet lines. An order of magnitudeestimate places our observed EBs in the range of $T\sim 2\cdot 10^4-10^5$ K.

Observations of Ellerman bomb emission features in He I D3 and He I 10830 {\AA}