Spectroscopic Classification of ASASSN-18am, ASASSN-18ao, and ASASSN-18ap
ATel #11180; E. Falco, M. Calkins (Harvard CfA), J. L. Prieto (UDP/MAS), K. Z. Stanek (OSU)
on 17 Jan 2018; 00:30 UT
Credential Certification: Jose L. Prieto (firstname.lastname@example.org)
Subjects: Optical, Supernovae, Transient
We report optical spectroscopic observations of the ASAS-SN transients ASASSN-18am/AT2018gk, ASASN-18ao/AT2018gm, and ASASSN-18ap/AT2018gn (ATel #11178), obtained on UT 2018 Jan 14-16 with FAST (range 3600-7450 Angstroms) mounted on the F. L. Whipple Observatory 1.5-m telescope. We used SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to aid with the type, phase and redshift determination. ASASSN-18am has a blue continuum, relatively weak and broad H-alpha (FWHM ~ 5000 km/s), and strong He II in emission (narrow and broad features), consistent with a young Type II SN. ASASSN-18ao is a Type Ia SN around peak with strong host galaxy contamination at z=0.04104 (redshift from host galaxy absorption lines). ASASSN-18ap shows broad H-alpha and other features characteristic of a Type II SN, also with strong host galaxy contamination.