FLOYDS Classification of AT 2019ein / ATLAS19ieo as a Young and Peculiar SN Ia

ATel #12719; Jamison Burke (Las Cumbres Observatory/UC Santa Barbara), Iair Arcavi (Tel Aviv University), D. Andrew Howell (LCO/UCSB), Daichi Hiramatsu (LCO/UCSB), Curtis McCully (LCO), Craig Pellegrino (LCO)
on 3 May 2019; 01:00 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Iair Arcavi (arcavi@gmail.com)

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We obtained a spectrum of AT 2019ein / ATLAS19ieo (Tonry et al. 2019, TNSTR 33987) on 2019 May 2.3 UT with the robotic FLOYDS instrument mounted on the Las Cumbres Observatory 2-meter telescope on Haleakala, Hawai'i, under the Global Supernova Project (PI: Howell). Using Superfit (Howell et al. 2005, ApJ, 634, 1190) and SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find best fits to SNe Ia, including SN 2002bo 13 days before peak and SN 2001ay. The supernova is closest to NGC 5353 (z = 0.007755; van Driel et al. 2001, A&A, 378, 370 via NED), but the features of the spectrum appear to be both blueshifted relative to this redshift and at high velocity. The Ca II IR triplet is highly blended with O I lines, creating an extremely broad and blended absorption feature. The high velocities and the absolute magnitude at this redshift suggest that the supernova was caught soon after explosion. Further follow up is encouraged. Our classification spectrum is publicly available on the Transient Name Server.