Last Updated：2025/12/04
(supernovae astronomy) A cloud of gas that obscures the poles of a star undergoing hypernova (HN), which gets heated by the polar jet escaping the hypernova progenitor star (hnp), and may absorb the energy of a weak gamma-ray burst (GRB), leaving an observable HN lacking the associated GRB, or be penetrated by a stronger GRB, giving a HN with an associated GRB.
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jet cocoon
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Source Word
jet cocoon
Noun
(supernovae
astronomy)
A
cloud
of
gas
that
obscures
the
poles
of
a
star
undergoing
hypernova
(HN),
which
gets
heated
by
the
polar
jet
escaping
the
hypernova
progenitor
star
(hnp),
and
may
absorb
the
energy
of
a
weak
gamma-ray
burst
(GRB),
leaving
an
observable
HN
lacking
the
associated
GRB,
or
be
penetrated
by
a
stronger
GRB,
giving
a
HN
with
an
associated
GRB.
Japanese Meaning
超新星天文学における用語。ハイパーノヴァを起こす星の極部を覆い隠すガスの雲を指す。これは、ハイパーノヴァ前駆星から逃れる極方向のジェットによって加熱され、場合によっては弱いガンマ線バーストのエネルギーを吸収したり、強いガンマ線バーストに貫通されたりする現象に関連している。
Sense（1）
(supernovae
astronomy)
A
cloud
of
gas
that
obscures
the
poles
of
a
star
undergoing
hypernova
(HN),
which
gets
heated
by
the
polar
jet
escaping
the
hypernova
progenitor
star
(hnp),
and
may
absorb
the
energy
of
a
weak
gamma-ray
burst
(GRB),
leaving
an
observable
HN
lacking
the
associated
GRB,
or
be
penetrated
by
a
stronger
GRB,
giving
a
HN
with
an
associated
GRB.
（ plural ）
