VLT/FORS2 spectroscopic classification of nuclear transient Gaia18aoq as Supernova Type IIP
ATel #11446; N. Ihanec(Univ. Nova Gorica), M. Gromadzki, L. Wyrzykowski (Warsaw)
on 20 Mar 2018; 07:10 UT
Credential Certification: Lukasz Wyrzykowski (wyrzykow@astrouw.edu.pl)
Subjects: Optical, Supernovae, Transient
The optical transient Gaia18aoq/AT2018aev was discovered by Gaia Science Alerts program on 2018-01-31. The transient was coinciding with the nucleus of 2MASX J13550786-3823227.
We obtained the spectrum on 2018-03-14 with the FOcal Reducer/low dispersion Spectrograph 2 (FORS2) on the Very Large Telescope (VLT). The spectroscopic classification was done using SNID code (Blondin & Tonry 2007, ApJ, 666, 1024) and it was matched to SN Type IIP, 9 days past maximum. Estimated redshift z=0.026 gives the absolute magnitude of the transient of approximately -16.84 mag.
The redshift was based on host broad H-alpha line. The spectrum shows blue continuum with superimposed emission lines of the Balmer series, [O II], [O III] and faint S II and H-beta .
Name | IAU name | RA (J2000) | Dec (J2000) | Disc. Date | Disc. Mag | Obs. Date | z | Host | Type | Notes
Gaia18aoq | AT2018aev | 13:55:07.91 | -38:23:22.74 | 2018-01-31 | 18.61 | 2018-03-14 | 0.026 | 2MASX J13550786-3823227 | SN IIP | +9 days
We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts). We also thank ESO and VLT staff for the observations. VLT/FORS2 ToO observations were carried under ESO programme 0100.B-0503(A), PI: Gromadzki.
