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Type determination of SN 2005cy and SN 2005cx

ATel #568; Avishay Gal-Yam (Caltech) and Keren Sharon (TAU)
on 16 Jul 2005; 12:55 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Avishay Gal-Yam (avishay@astro.caltech.edu)

Subjects: Optical, Supernovae

Avishay Gal-Yam and Keren Sharon report for the CCCP: We have observed SN 2005cy (Sehgal, Newton and Puckett 2005; CBET #180) with the DBSP spectrograph mounted on the Hale 200" telescope at Palomar Observatory on 2005 July 16.33 UT. A preliminary reduction shows a weak, moderately wide Halpha line superposed on a blue featureless continuum. We therefore conclude that SN 2005cy is likely a young type IIn SN. The redshift we measure from the peak of the Halpha line is consistent with the cataloged redshift of the host galaxy UGC 11241, z~0.036. A similar spectrum of SN 2005cx (Dimai 2005; CBET #179) obtained on July 16.46 UT, shows this is a type Ia SN, similar to SN 1994D, several weeks after explosion.

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