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We present a detailed spectroscopic analysis of the recently discovered fastevolving Type I superluminous supernova (SLSN-I), SN 2019neq (at redshift z =0.1059) comparing it to the well-studied slow evolving SLSN-I, SN 2010kd (z =0.101). Our investigation concentrates on optical spectra taken during thephotospheric phase. The observations of SN 2019neq were carried out with the10m Hobby-Eberly Telescope (HET) Low Resolution Spectrograph-2 (LRS2) atMcDonald Observatory. We apply the SYN++ code to model the spectra taken at -4days, +5 days and +29 days from maximum light. We examine the chemicalevolution and ejecta composition of the SLSN by identifying the elements andionization states in its spectra. Our analysis confirms that SN 2019neq is afast evolving SLSN-I. We derive the number density of each ionization state atthe epoch of the three observations. Finally, we give constraints on the lowerlimit of the ejecta mass and find a hint for a possible relation between theevolution timescale and the ejected mass of SLSNe-I.

Comparative Spectral Analysis of the Superluminous Supernova 2019neq