The early detection and follow-up of the highly obscured type II supernova 2016ija/DLT16am. (2018)
Keywords :
galaxies individual (NGC 1532) ; supernovae: general ; supernovae: individual (SN 2016ija, DLT16am)
Abstract:We present our analysis of the Type II supernova DLT16am (SN2016ija). The object was discovered during the ongoing D<40Mpc (DLT40) one-day cadence supernova search at r~20.1mag in the "edge-on" nearby (D=20.0+/-4.0Mpc) galaxy NGC1532. The subsequent prompt and high-cadenced spectroscopic and photometric follow-up revealed a highly extinguished transient, with E(B-V)=1.95+/-0.15mag, consistent with a standard extinction law with R_V_=3.1 and a bright (M_V_=-18.48+/-0.77mag) absolute peak magnitude. A comparison of the photometric features with those of large samples of SNe II reveals a fast rise for the derived luminosity and a relatively short plateau phase, with a slope of S_50V_=0.84+/-0.04mag/50days, consistent with
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In this paper we describe the highly obscured, nearby Type II SN
DLT16am (SN 2016ija), the first SN discovered by the Distance Less
Than 40 (DLT40) Mpc supernova search. DLT16am was discovered
on 2016 November 21.19 UT in the nearby galaxy NGC 1532.
The goal of DLT40 survey is not to find many SNe, but ~10 nearby SNe
per year within ~1day from explosion. Fully operational since late
summer 2016, we observe ~300-600 galaxies per night using a PROMPT
0.4m telescope (PROMPT5) at the Cerro Tololo Inter-American
Observatory (CTIO), achieving a typical single-epoch depth of
r~19-20mag with filterless observations and a 45s integration time.
The field of view is 10x10arcmin^2^.
See section 2 for further explanations.
The spectral sequence of DLT16am is shown in Figure 3, while the log
of the spectroscopic observations in the optical and NIR domains is
reported in Table 1.
Optical spectra were mainly provided by Public ESO Spectroscopic
Survey for Transient Objects (PESSTO) using the ESO 3.58m New
Technology Telescope (NTT) with the ESO Faint Object Spectrograph and
Camera (v.2, EFOSC2), and the Las Cumbres Observatory network of
telescopes, using the 2m Faulkes north and south telescopes with
FLOYDS. Early-phase spectra were also provided using the 10m South
African Large Telescope (SALT) with the Robert Stobie Spectrograph
(RSS), and the 2.56m Nordic Optical Telescope (NOT) with Andalucia
Faint Object Spectrograph and Camera (ALFOSC).
Most NIR spectra were provided by PESSTO using the NTT with the SOFI
spectrograph. Two NIR spectra were obtained using the Gemini NIR
Spectrograph (GNIRS) at Gemini North. An NIR spectrum was also
obtained using the 6.5m Magellan Baade Telescope with the Folded-port
InfraRed Echellette (FIRE).
Multi-wavelength (300-2500nm) intermediate resolution spectra were
obtained using the ESO Very Large Telescope (VLT) with X-shooter,
mounted at the Cassegrain focus of the 8m VLT UT2 telescope.
Photometric data are shown in Figure 4 and reported in Tables 2-4.
See section 3 for further explanations.
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