SN 2018hna: 1987A-like Supernova with a Signature of Shock Breakoutстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 20 декабря 2019 г.
Аннотация: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.
SN2018hna has a rise time of ∼ 88 days in the V band, similar to SN1987A. A 56Ni mass of ∼0.087±0.004 Msun
is inferred for SN2018hna from its bolometric LC. Hydrodynamical modeling of the cooling phase suggests a
progenitor with a radius ∼50 Rsun, a mass of ∼14–20 Msun, and an explosion energy of ∼1.7–2.9×10^51 erg. The
smaller inferred radius of the progenitor than a standard red supergiant is indicative of a blue supergiant progenitor
of SN2018hna. A subsolar metallicity (∼0.3 Z_solar) is inferred for the host galaxy UGC07534, concurrent with the
low-metallicity environments of 1987A-like events.