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Classification of nuclear transient Gaia18aeo/AT2018ig as SN Ia with SALT spectroscopy

ATel #11291; N. Ihanec (University of Nova Gorica), M. Gromadzki, L. Wyrzykowski (Warsaw University Astronomical Observatory, Poland), D. A. H. Buckley (South African Astronomical Observatory)
on 13 Feb 2018; 06:35 UT
Credential Certification: Lukasz Wyrzykowski (wyrzykow@astrouw.edu.pl)

Subjects: Optical, Supernovae, Transient

We report on SALT spectroscopy of transient Gaia18aeo/AT2018ig, discovered by Gaia Science Alerts program on 2018-01-17. The transient was detected in the nucleus of the host galaxy LEDA 634652. A low resolution (R = 350) SALT/RSS spectra was taken on 2018-02-09, under the SALT Large Programme on transients (2016-2-LSP-001).

The spectroscopic classification was done using SNID code (Blondin & Tonry 2007, ApJ, 666, 1024) and it was matched to SN Type Ia at about 3 weeks past maximum. Spectrum shows narrow emission Halpha line and also broad HeI present due to host galaxy and corresponds to redshift z=0.086. Gaia photometric measurement at the moment of observation and at this redshift corresponds to absolute magnitude of about -19.79 mag which is consistent with Type Ia.

Name | IAU name | RA (J2000) | Dec (J2000) | Disc. Date | Disc. Mag | Obs. Date | z | Host | Type | Notes
Gaia18aeo | AT2018ig | 03:06:37.26 | -36:37:05.92 | 2018-01-17 | 18.25 | 2018-02-09 | 0.086 | LEDA 634652 | SN Ia | +21 days

We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts).