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Spectroscopic Confirmation of Three M31 Novae from iPTF

ATel #5852; S. Tang (Caltech/UCSB), Y. Cao (Caltech), M. M. Kasliwal (Carnegie/Princeton), on behalf of the iPTF collaboration
on 5 Feb 2014; 05:51 UT
Credential Certification: Sumin Tang (tangsm@gmail.com)

Subjects: Optical, Nova, Transient

Referred to by ATel #: 6374

We report spectroscopic observations obtained with the Dual Imaging Spectrograph on the 3.5m telescope at Apache Point Observatory on UT Feb 3, 2014, on the following three recent M31 nova candidates: \n Name | RA (J2000) | Dec (J2000) | Discovery M31 2014-02a | 00:43:26.76 | +41:23:33.3 | iPTF on UT Feb 2.1, 2014 (iPTF14lf; ATel #5844); M31 2014-01c | 00:42:34.90 | +41:14:56.4 | Hornoch &Kucakova on UT Jan 25.7, 2014 (ATel #5815) M31 2014-01b | 00:42:23.58 | +41:29:12.4 | iPTF on UT Jan 18.1, 2014 (iPTFht, ATel #5785) M31 2014-02a (iPTF14lf) showed strong emission lines of Balmer series, N II 4650 A, and He I (4471, 5015, 5876, 7065 A). The Halpha showed a sharp blue shifted peak and a redshifted shoulder with a FWZI of 10,000 km/s. Therefore, we classify it as a He/N nova. M31 2014-01c showed strong Balmer and Fe II emission lines (FWHM of Halpha ~ 1700 km/s), and is therefore a FeII nova. M31 2014-01b (iPTFht) showed strong emission lines of Halpha (FWHM ~ 900 km/s), OI 7773 and 8446 A. It also showed relatively weak Hbeta emission. The intensity ratio of F(Halpha/Hebta) is ~15, suggesting extinction or/and high gas density; The intensity ratio of F(OI8446/OI7773) is ~2, suggesting high gas density (Williams 2012, AJ, 144, 98). Given it's faint peak magnitude (R=19 mag; ATel #5785), it is likely a highly extincted nova.