Re-classification of SN 2009hz as a Galactic CV

ATel #12217; S. Benetti, A. Pastorello, A. Reguitti (INAF-OAPd), S. J. Smartt, K. W. Smith (Queen's University Belfast), J. Tonry, L. Denneau, A. Heinze, H. Weiland, H. Flewelling (IfA, University of Hawaii), B. Stalder (LSST), A. Rest (STScI), C. Stubbs (Harvard University), D. R. Young, K. Maguire, S. J. Prentice, O. McBrien, D. O'Neill, P. Clark, M. Magee, M. Fulton, A. McCormack (Queen's University Belfast), D. E. Wright (University of Minnesota)
on 15 Nov 2018; 17:21 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

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Following the discovery of ATLAS18zfn and reported to TNS as AT2018iml we noticed that this transient is coincident, within an error box of 0.3", with the position of SN 2009hz. Inserra et al 2009 (CBET 1907,1907.txt"> http://www.cbat.eps.harvard.edu/iau/cbet/001900/CBET001907.txt ) described the 2009 spectrum as a very blue, featureless continuum. A careful re-analysis of the 2009 spectrum confirms the blue continuum and reveals the presence of relatively weak absorption lines consistent with H-beta, H-gamma and H-delta at rest frame. We thus re-classify the 2009 transient as a Galactic Cataclysmic variable, which is now again in outburst.