New analysis for the correlation between gravitational wave and neutrino detectors during SN1987A

P Galeotti,G Pizzella

doi:10.1140/epjc/s10052-016-4277-4

Abstract

Two major problems, still associated with the SN1987A, are: (a) the signals observed with the gravitational waves detectors, (b) the duration of the collapse. Indeed, (a) the sensitivity of the gravitational wave detectors seems to be small for detecting gravitational waves and, (b) while some experimental data indicate a duration of order of hours, most theories assume that the collapse develops in a few seconds. Since recent data of the X-ray NuSTAR satellite show a clear evidence of an asymmetric collapse, we have revisited the experimental data recorded by the underground and gravitational wave detectors running during the SN1987A. New evidence is shown that confirms previous results, namely that the data recorded by the gravitational wave detectors running in Rome and in Maryland are strongly correlated with the data of both the Mont Blanc and the Kamiokande detectors, and that the correlation extends over a long period of time (1 or 2 h) centered at the Mont Blanc time. This result indicates that also Kamiokande detected neutrinos at the Mont Blanc time, and these interactions were not identified because not grouped in a burst.

Highlights

One major problem associated with a supernova explosion is the duration of the inner core collapse
We have applied the net excitation method to search for correlations between GW detectors and a single list of events, Fig. 4 On the ordinate scale we show the probability pi that the two correlation curves (RO–MA–LSD and RO–MA–KND), calculated over periods of 30-min, stepped by 0.1 h, give similar probability values at each step
Since one of the comments we have often received in the past was that the LSD event is a statistical fluctuation in the data, a noise, here again we stress that the Mont Blanc LSD signal

Summary

Introduction

One major problem associated with a supernova explosion is the duration of the inner core collapse. According to most theories of supernova explosion, the collapse develops in a few seconds but, as we will discuss here, all the experimental data of the collapse originating this supernova indicate a duration of order of hours. Only the recent observations of the remnant of SN1987A made by NuSTAR (Nuclear Spectroscopic Telescope Array, a satellite launched by NASA on June 2012 to study the X-ray sky) show a clear evidence of an asymmetric collapse [9]. These data, in particular the high resolution analysis of 44Ti lines, show a direct evidence of large-scale asymmetry in

Objectives

Discussion

Conclusion