Observation by Robin Leadbeater: Spectrum of SN 2021hem - A "Hostles...

SN 2021hem was discovered by the Zwicky Transient Facility on 24th March 2021 and confirmed as a type Ia supernova on 1st April 2021. At the time of this observation it was g mag 17 and rising. The spectrum matches a type Ia supernova confirming the original classification, though the best fit from SNID is to peculiar type Ia SN 2006gz.

The supernova appears to be hostless with the nearest visible candidate host galaxy, LEDA 57905 several arc minutes away. (There are two faint SDSS galaxies closer but the redshifts of these are much higher than the estimated redshift of the supernova from the spectrum)

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Jeremy Shears, Hugh Allen, Graham Winstanley, David Strange, Philip Masding

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