期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 438, 期 4, 页码 3243-3254出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt2434
关键词
line: formation; nuclear reactions, nucleosynthesis, abundances; stars: abundances; stars: magnetars; stars: neutron; X-rays: general
资金
- Columbia Undergraduate Scholars Program
- Department of Physics at Columbia University
- Helmholtz University [VH-NG-825]
- Deutsche Forschungsgemeinschaft [SFB 634]
- Helmholtz International Center for FAIR within the framework of the LOEWE programme launched by the state of Hesse
- Helmholtz Association through the Nuclear Astrophysical Virtual Institute [VH-VI-417]
The origin of rapid neutron capture (r-process) nuclei remains one of the longest standing mysteries in nuclear astrophysics. Core collapse supernovae (SNe) and neutron star binary mergers are likely r-process sites, but little evidence yet exists for their in situ formation in such environments. Motivated by the advent of sensitive new or planned X-ray telescopes such as the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Large Observatory for X-ray Timing (LOFT), we revisit the prospects for the detection of X-ray decay lines from r-process nuclei in young or nearby supernova remnants. For all remnants planned to be observed by NuSTAR (and several others), we conclude that r-process nuclei are detectable only if the remnant possesses a large overabundance relative to the average yield per SN. Prospects are better for the next Galactic SN (assumed age of 3 yr and distance of 10 kpc), for which an average r-process yield is detectable via the 10.7 (9.2) keV line complexes of Os-194 by LOFT at 6 Sigma (5 Sigma) confidence; the 27.3 keV line complex of Sb-125 is detectable by NuSTAR at 2 Sigma for . We also consider X-rays lines from the remnants of Galactic magnetars, motivated by the much higher r-process yields of the magnetorotationally driven SNe predicted to birth magnetars. The similar to 3.6-3.9 keV lines of Sn-126 are potentially detectable in the remnants of the magnetars 1E1547.0-5408 and 1E2259+586 by LOFT for an assumed r-process yield predicted by recent simulations. The (non-)detection of these lines can thus probe whether magnetars are indeed born with millisecond periods. Finally, we consider a blind survey of the Galactic plane with LOFT for r-process lines from the most recent binary neutron star merger remnant, concluding that a detection is unlikely without additional information on the merger location.
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