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16923

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DataCite Commons2023-04-21 更新2025-04-15 收录
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http://esdcdoi.esac.esa.int/doi/html/data/astronomy/hst/16923.html
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Neutron star mergers are confirmed sites of r-process nucleosynthesis comma observationally identified by their kilonovae. In particular comma the study of short gamma-ray bursts (SGRBs) comma which span zvirgul0.1-2 comma are a promising avenue to uncover kilonovae. Monitoring the temporal and color evolution of SGRB-kilonovae provides quantifiable estimates of their ejecta masses and compositions comma of interest to assessing the contribution of such mergers to the universe.s heavy element budget. In particular comma the identification of nearby (z<0.1) kilonovae provide great distinguishing power. Recently comma GRB 211211A was discovered in likely association with a galaxy at 350 Mpc (z=0.076). At this distance comma the detection and temporal behavior of an associated NIR transient is fully consistent with a kilonova. If the distance is confirmed comma this would make GRB 211211A the most nearby such event beyond the multi-messenger GW170817. We propose 2 orbits of HST imaging to secure the nearby origin of GRB 211211A by placing constraints on an underlying comma unseen galaxy. Current ground-based observations have reached their limits comma and cannot rule out the full range of known host galaxy luminosities and redshifts. If an underlying galaxy is detected from a higher-redshift origin comma the NIR transient would be equally exciting comma outshining any known kilonova or supernova to date.
提供机构:
European Space Agency
创建时间:
2023-04-21
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