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MMT Spectroscopy of SN 2009ay

ATEL # 1993; Alicia Soderberg (Harvard/CfA) and Warren Brown (SAO)
on 29 Mar 2009; 17:15 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Alicia M. Soderberg (

Subjects: Optical, Nova, Supernova

We observed SN 2009ay (CBET 1728) with the MMT/Blue Channel Spectrograph on Mar 28.5 UT. The spectrum clearly shows broad P Cygni Hydrogen Balmer features superposed on a nearly featureless blue continuum, confirming the earlier report in CBET 1739. From the absorption minimum of the H beta line we infer an expansion velocity of 9800 km/s after accounting for the recession velocity of the host galaxy. We further note that the spectrum resembles those of luminous and peculiar Type II supernovae 2008es (Gezari et al. 2009, Miller et al. 2009) and 2005ap (Quimby et al. 2007). Further observations are in progress.

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates