English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Despite more than 30 years of searches, the compact object in Supernova (SN)1987A has not yet been detected. We present new limits on the compact object inSN 1987A using millimeter, near-infrared, optical, ultraviolet, and X-rayobservations from ALMA, VLT, HST, and Chandra. The limits are approximately 0.1mJy ($0.1\times 10^{-26}$ erg s$^{-1}$ cm$^{-2}$ Hz$^{-1}$) at 213 GHz, 1 Lsun($6\times 10^{-29}$ erg s$^{-1}$ cm$^{-2}$ Hz$^{-1}$) in optical if ourline-of-sight is free of ejecta dust, and $10^{36}$ erg s$^{-1}$ ($2\times10^{-30}$ erg s$^{-1}$ cm$^{-2}$ Hz$^{-1}$) in 2-10 keV X-rays. Our X-raylimits are an order of magnitude less constraining than previous limits becausewe use a more realistic ejecta absorption model based on three-dimensionalneutrino-driven SN explosion models (presented in an accompanying article). Theallowed bolometric luminosity of the compact object is 22 Lsun if ourline-of-sight is free of ejecta dust, or 138 Lsun if dust-obscured. Dependingon assumptions, these values limit the effective temperature of a neutron starto <4-8 MK and do not exclude models, which typically are in the range 3-4 MK.For the simplest accretion model, the accretion rate for an efficiency $\eta$is limited to $< 10^{-11} \eta^{-1}$ Msun yr$^{-1}$, which excludes mostpredictions. For pulsar activity modeled by a rotating magnetic dipole invacuum, the limit on the magnetic field strength ($B$) for a given spin period($P$) is $B < 10^{14} P^2$ G s$^{-2}$. By combining information about radiationreprocessing and geometry, it is likely that the compact object is adust-obscured thermally-emitting neutron star, which may appear as a region ofhigher-temperature ejecta dust emission.

The 30-Year Search for the Compact Object in SN 1987A