SIMBAD references

2019ApJ...882L..15S - Astrophys. J., 882, L15-L15 (2019/September-2)

SN 2018hna: 1987A-like supernova with a signature of shock breakout.

SINGH A., SAHU D.K., ANUPAMA G.C., KUMAR B., KUMAR H., YAMANAKA M., BAKLANOV P.V., TOMINAGA N., BLINNIKOV S.I., MAEDA K., DUTTA A., BHALERAO V., ANCHE R.M., BARWAY S., AKITAYA H., NAKAOKA T., KAWABATA M., KAWABATA K.S., SASADA M., TAKAGI K., MAEHARA H., ISOGAI K., KINO M., TAGUCHI K. and NAGAO T.

Abstract (from CDS):

High-cadence ultraviolet, optical, and near-infrared photometric and low-resolution spectroscopic observations of the peculiar Type II supernova (SN) 2018hna are presented. The early-phase multiband light curves (LCs) exhibit the adiabatic cooling envelope emission following the shock breakout up to ∼ 14 days from the explosion. SN 2018hna has a rise time of ∼ 88 days in the V band, similar to SN 1987A. A 56Ni mass of ∼0.087 ± 0.004 M is inferred for SN 2018hna from its bolometric LC. Hydrodynamical modeling of the cooling phase suggests a progenitor with a radius ∼50 R, a mass of ∼14-20 M, and an explosion energy of ∼1.7-2.9 x 1051 erg. The smaller inferred radius of the progenitor than a standard red supergiant is indicative of a blue supergiant progenitor of SN 2018hna. A subsolar metallicity (∼0.3 Z) is inferred for the host galaxy UGC 07534, concurrent with the low-metallicity environments of 1987A-like events.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Supernovae - Core-collapse supernovae - Type II supernovae

Simbad objects: 18

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2020.09.21-13:02:58

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