A dataset provided by the European Space Agency

Proposal ID 0120148
Obs ID 01201480003
Title Probing core collapse: 44Ti and 60Co nucleosynthesis in SN 1987A
Download Data Associated to the proposal https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:0120148
DOI https://doi.org/10.57780/esa-1kges4a
Author Knodlseder
Abstract SN1987 A in the Large Magellanic Cloud is a once-in-a-lifetime opportunity to observe gamma-ray emission from a Type II supernova with INTEGRAL. The radioactive isotope 44Ti, emitter of gamma-ray photons at 67.9, 78.4, and 1157 keV, is an ideal tracer to probe core collapse physics, since it is created in appreciable amounts in the innermost layers of the exploding star. Radioactive decay of 60Co, accompanied by gamma-ray line emission at 1173 and 1332 keV, is sensitive to the neutron excess in the supernova, providing a unique chance for a direct measurement of this important parameter. Therefore, we propose to search for the gamma-ray line signatures that arise from the decay of 44Ti and 60Co produced in SN1987 A. The measurement of the gamma-ray line fluxes will allow the determination of the 44Ti and 60Co yields in SN1987 A, providing information about the position of the mass-cut, the maximum temperature and density reached during the passage of the shock wave in the ejecta, and the neutron excess. The 44Ti line profile will provide excellent information about the velocity structure of the ejecta close to the mass-cut, and probes the pre-supernova composition inside 2 Msol. We will use both SPI and IBIS to search for the three gamma-ray lines of 44Ti, although we only expect to detect the 1157 keV line with SPI within the requested 2000 kiloseconds of exposure time. 60Co is certainly an observational challenge, but due to the rapid decay of this isotope, INTEGRAL probably represents the last chance to measure its gamma-ray lines in SN1987 A. In addition to the 2000 kiloseconds, we also request the data rights for all additional observations of the LMC region in order to search for the 44Ti and 60Co decay signatures of SN1987 A.
Publications
Temporal Coverage 2004-01-06T20:12:23Z / 2004-01-12T22:04:25Z
Version 1.0
Mission Description The INTEGRAL (International Gamma-Ray Astrophysics Laboratory) mission, launched by the European Space Agency (ESA) on October 17, 2002, was designed to study high-energy phenomena in the universe. INTEGRAL was operating until february 2025 and it was equipped with three high-energy instruments: the Imager on Board the INTEGRAL Satellite (IBIS), the Spectrometer on INTEGRAL (SPI), and the JEM-X (Joint European Monitor for X-rays). Its Optical Monitoring Camera (OMC) provided optical V-band magnitude measurements, complementing the high-energy observations.
Creator Contact https://www.cosmos.esa.int/web/integral/helpdesk
Date Published 2025-03-25T09:54:29Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Knodlseder, 2025, 'Probing core collapse: 44Ti and 60Co nucleosynthesis in SN 1987A', 1.0, European Space Agency, https://doi.org/10.57780/esa-1kges4a