A new way to make Thorne-Zytkow objects

Details A new way to make Thorne-Zytkow objects A new way to make Thorne-Zytkow objects

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423l..19l&link_type=abstract

Astrophysical Journal, Part 2 - Letters, vol. 423, no. 1, p. L19-L22

Physics

13

Binary Stars, Neutron Stars, Star Formation, Stellar Models, Stellar Physics, Supergiant Stars, Supernovae, Stellar Mass, Stellar Mass Ejection, Stellar Orbits

Scientific paper

We have found a new way to make Thorne-Zytkow objects, which are massive stars with degenerate neutron cores. The asymmetric kick given to the neutron star formed when the primary of a massive tight binary system explodes as a supernova sometimes has the appropriate direction and amplitude to place the newly formed neutron star into a bound orbit with a pericenter distance smaller than the radius of the secondary. Consequently, the neutron star becomes embedded in the secondary. Thorne-Zytkow objects are expected to look like extreme M-type supergiants, assuming that they can avoid a runaway neutrino instability. Accretion onto the embedded neutron star will produce either an isolated, spun-up neutron star (possibly a short-period pulsar) or a black hole. Whether neutron star or black hole remnants predominate depends on the lifetime of Thorne-Zytkow objects, the accretion rates involved, and the maximum neutron star mass, none of which are definitively understood.

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