The early detection and follow-up of the highly obscured Type II Supernova 2016ija/DLT16am

Tartaglia, L., Sand, D.J., Valenti, S., Wyatt, S., Anderson, J.P., Arcavi, I., Ashall, C., Botticella, M.T., Cartier, R., Chen, T.W., Cikota, A., Coulter, D., Valle, M. Della, Foley, R.J., Gal-Yam, A., Galbany, L., Gall, C., Haislip, J.B., Harmanen, J., Hosseinzadeh, G., Howell, D.A., Hsiao, E.Y., Inserra, C., Jha, S.W., Kankare, E., Kilpatrick, C.D., Kouprianov, V.V., Kuncarayakti, H., Maccarone, T.J., Maguire, K., Mattila, S., Mazzali, P.A., McCully, C., Melandri, A., Morrell, N., Phillips, M.M., Pignata, G., Piro, A.L., Prentice, S., Reichart, D.E., Rojas-Bravo, C., Smartt, S.J., Smith, K.W., Sollerman, J., Stritzinger, M.D., Sullivan, M., Taddia, F. and Young, D.R. (2018) The early detection and follow-up of the highly obscured Type II Supernova 2016ija/DLT16am. Astrophysical Journal, 853 (1), [62]. (doi:10.3847/1538-4357/aaa014).

Abstract

We present our analysis of the Type II supernova DLT16am (SN 2016ija). The object was discovered during the ongoing D < 40 Mpc (DLT40) one-day cadence supernova search at r ∼ 20.1 mag in the edge-on nearby (D = 20.0 ± 4.0 Mpc) galaxy NGC 1532. The subsequent prompt and high-cadenced spectroscopic and photometric follow-up revealed a highly extinguished transient, with E(B - V) = 1.95 ±0.15 mag, consistent with a standard extinction law with RV=3.1 and a bright (MV = -18.48 ±0.77 mag) absolute peak magnitude. Acomparison 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 S50V = 0.84 ±0.04 mag 50 days, consistent with the photometric properties typical of those of fast-declining SNe II. Despite the large uncertainties on the distance and the extinction in the direction of DLT16am, the measured photospheric expansion velocity and the derived absolute V-band magnitude at ~50 days after the explosion match the existing luminosity-velocity relation for SNe II.

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Contributors

Author: C. Inserra

Author: M. Sullivan

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