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Realizing the utility of Ly$\alpha$ emission to trace the evolution of theintergalactic medium (IGM) during the epoch of reionization requires deepspectroscopy across the boundary of optical and near-infrared (NIR)spectrographs at $z\sim7.2$ when Ly$\alpha$ emission is at $\sim$1$\mu$m. OurTexas Spectroscopic Search for Ly$\alpha$ Emission at the End of Reionizationincludes 18 nights of deep spectroscopic observations using the Keck DEIMOS(optical) and MOSFIRE (NIR) spectrographs. Within this dataset we observeLy$\alpha$ emission from 183 photometric-redshift selected galaxies at $z =$5.5 - 8.3 from the Cosmic Assembly Near infrared Deep Extragalactic LegacySurvey (CANDELS). Our overlapping MOSFIRE observations, over 84 galaxies total,provide the deepest NIR spectroscopic data yet obtained for Ly$\alpha$ fromgalaxies $z > 7$, with $>16$ hr integration time for four observed galaxies.Here we analyze these four targets, and we report the discovery of a new $z =7.60$ Ly$\alpha$ detection as well as provide an updated observation of thepreviously confirmed $z=7.51$ Ly$\alpha$ emission from Finkelstein et al.(2013) with a $\sim$3$\times$ longer exposure time. Our analysis of theseLy$\alpha$ emission line profiles reveal a significant asymmetric shape. Thetwo detected Ly$\alpha$ emission lines from bright sources($M_{\text{UV}}<-20.25$) could imply that these bright galaxies inhabit ionizedbubbles in a partially neutral IGM, although deeper exposures may yet revealLy$\alpha$ emission in the fainter sources.

Texas Spectroscopic Search for Ly$\alpha$ Emission at the End of Reionization II. The Deepest Near-Infrared Spectroscopic Observation at $z\gtrsim7$