NOT spectroscopic classification of supernova PS15aip/Gaia15aev as Type IIn
ATel #7530; T. Reynolds, S. Mattila, J. Harmanen (University of Turku), N. Blagorodnova, M. Fraser (University of Cambridge), L. Wyrzykowski (Warsaw University Observatory), R. Kotak, E. Kankare (Queen's University Belfast)
on 18 May 2015; 20:19 UT
Credential Certification: Seppo Mattila (seppo.mattila@utu.fi)
Subjects: Optical, Supernovae
We report the spectroscopic classification of supernova PS15aip/Gaia15aev based on a low-resolution spectrum obtained on May 16.2 UT, with the Nordic Optical Telescope (+ ALFOSC; range 320-910nm; R = 360).
PS15aip was discovered (Smith et al. 2015, ATel #
7488) by the Pan-STARRS Survey for Transients (PSST) programme at magnitude of 17.46 on 2015 May 02.8 UT, the most recent non-detection being 30 days earlier. The object was later detected by the Gaia Photometric Science Alerts programme at magnitude of 17.92 on 2015 May. 11.6 UT. PS15aip/Gaia15aev is located 2.16 arcsec from the nucleus of the galaxy KUG 1319+356.
The spectrum exhibits narrow (FWHM ~ 1150 km/s) spectral lines of the Balmer series on a featureless continuum. The H alpha line exhibits a Lorentzian profile. Adopting the host galaxy redshift z = 0.0195 from the NED and a moderate reddening of E(B-V)=0.2, we estimate an absolute magnitude for PS15aip/Gaia15aev to be -17.8 at the time of the PSST discovery.
Name | RA (J2000) | Dec (J2000) | Disc. Date | Disc Mag | z | Type | Phase | Notes
PS15aip/Gaia15aev | 13:21:55.23 | +35:21:32.0 | 20150502 | 17.46 |~0.0195| SN IIn | ~1 month past max | (1)
(1) Good match found with the type IIn SN 1995G at ~1 month after the max. light, adopting a reddening of E(B-V)=0.2
The classifications were done with GELATO (Harutyunyan et al. 2008, A&A,488, 383). We acknowledge ESA Gaia (http://cosmos.esa.int/gaia), and the DPAC Photometric Science Alerts Team (http://gaia.ac.uk/selected-gaia-science-alerts) (Rixon et al,2014, ATel #6593).
