التفاصيل البيبلوغرافية
| العنوان: |
Composition Effects on Kilonova Spectra and Light Curves. I. |
| المؤلفون: |
Even, Wesley, Korobkin, Oleg, Fryer, Christopher L., Fontes, Christopher J., Wollaeger, R. T., Hungerford, Aimee, Lippuner, Jonas, Miller, Jonah, Mumpower, Matthew R., Misch, G. Wendell |
| المصدر: |
Astrophysical Journal; 8/10/2020, Vol. 899 Issue 1, p1-14, 14p |
| مصطلحات موضوعية: |
LIGHT curves, RADIOACTIVE decay, HEAVY elements, URANIUM, RARE earth metals, SCIENTISTS |
| مستخلص: |
The merger of neutron star binaries is believed to eject a wide range of heavy elements into the universe. By observing the emission from this ejecta, scientists can probe the ejecta properties (mass, velocity, and composition distributions). The emission (a.k.a. kilonova) is powered by the radioactive decay of the heavy isotopes produced in the merger and this emission is reprocessed by atomic opacities to optical and infrared wavelengths. Understanding the ejecta properties requires calculating the dependence of this emission on these opacities. The strong lines in the optical and infrared in lanthanide opacities have been shown to significantly alter the light curves and spectra in these wavelength bands, arguing that the emission in these wavelengths can probe the composition of this ejecta. Here we study variations in the kilonova emission by varying individual lanthanide (and the actinide uranium) concentrations in the ejecta. The broad forest of lanthanide lines makes it difficult to determine the exact fraction of individual lanthanides. Nd is an exception. Its opacities above 1 μm are higher than other lanthanides and observations of kilonovae can potentially probe increased abundances of Nd. Similarly, at early times when the ejecta is still hot (first day), the U opacity is strong in the 0.2–1 μm wavelength range and kilonova observations may also be able to constrain these abundances. [ABSTRACT FROM AUTHOR] |
|
Copyright of Astrophysical Journal is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder