Common envelope jets supernova (CEJSN) impostors resulting from a neutron star companion

Avishai Gilkis, Noam Soker, Amit Kashi

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We propose a new type of repeating transient outburst initiated by a neutron star (NS) entering the envelope of an evolved massive star, accreting envelope material and subsequently launching jets which interact with their surroundings. This interaction is the result of either a rapid expansion of the primary star due to an instability in its core near the end of its nuclear evolution, or due to a dynamical process which rapidly brings the NS into the primary star. The ejecta can reach velocities of ≈104 km s-1 despite not being a supernova, and might explain such velocities in the 2011 outburst of the luminous blue variable progenitor of SN 2009ip. The typical transient duration and kinetic energy are weeks to months, and up to ≈1051 erg, respectively. The interaction of an NS with a giant envelope might be a phase in the evolution of the progenitors of most NS-NS binary systems that later undergo a merger event. If the NS spirals in all the way to the core of the primary star and brings about its complete disruption we term this a 'common envelope jets supernova' (CEJSN), which is a possible explanation for the peculiar supernova iPTF14hls. For a limited interaction of the NS with the envelope we get a less luminous transient, which we term a CEJSN impostor.

Original languageEnglish
Pages (from-to)4233-4242
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - 21 Jan 2019


  • Accretion
  • Accretion discs - binaries: close - stars: jets - stars: massive - stars: neutron - supernovae: general


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