Opin vísindi

The Emergence of a Lanthanide-rich Kilonova Following the Merger of Two Neutron Stars

The Emergence of a Lanthanide-rich Kilonova Following the Merger of Two Neutron Stars


Titill: The Emergence of a Lanthanide-rich Kilonova Following the Merger of Two Neutron Stars
Höfundur: Tanvir, N. R.
Levan, A. J.
González-Fernández, C.
Korobkin, O.
Mandel, I.
Rosswog, S.
Hjorth, J.
D’Avanzo, P.
Fruchter, A. S.
Fryer, C. L.
... 44 fleiri höfundar Sýna alla höfunda
Útgáfa: 2017-10-16
Tungumál: Enska
Umfang: L27
Háskóli/Stofnun: Háskóli Íslands
University of Iceland
Svið: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Deild: Raunvísindastofnun (HÍ)
Science Institute (UI)
Birtist í: The Astrophysical Journal Letters;848(2)
ISSN: 2041-8205
2041-8213 (eISSN)
DOI: 10.3847/2041-8213/aa90b6
Efnisorð: Gravitational waves; Nuclear reactions; Nucleosynthesis, abundances; Stars: neutron; Hubblessjónaukinn; Stjörnufræði; Stjarneðlisfræði
URI: https://hdl.handle.net/20.500.11815/526

Skoða fulla færslu

Tilvitnun:

Tanvir, N. R., Levan, A. J., González-Fernández, C., Korobkin, O., Mandel, I., Rosswog, S., . . . Wijers, R. A. M. J. (2017). The Emergence of a Lanthanide-rich Kilonova Following the Merger of Two Neutron Stars. The Astrophysical Journal Letters, 848(2), L27. doi:10.3847/2041-8213/aa90b6

Útdráttur:

We report the discovery and monitoring of the near-infrared counterpart (AT2017gfo) of a binary neutron-star merger event detected as a gravitational wave source by Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo (GW170817) and as a short gamma-ray burst by Fermi Gamma-ray Burst Monitor (GBM) and Integral SPI-ACS (GRB 170817A). The evolution of the transient light is consistent with predictions for the behavior of a "kilonova/macronova" powered by the radioactive decay of massive neutron-rich nuclides created via r-process nucleosynthesis in the neutron-star ejecta. In particular, evidence for this scenario is found from broad features seen in Hubble Space Telescope infrared spectroscopy, similar to those predicted for lanthanide-dominated ejecta, and the much slower evolution in the near-infrared ${K}_{{\rm{s}}}$-band compared to the optical. This indicates that the late-time light is dominated by high-opacity lanthanide-rich ejecta, suggesting nucleosynthesis to the third r-process peak (atomic masses $A\approx 195$). This discovery confirms that neutron-star mergers produce kilo-/macronovae and that they are at least a major—if not the dominant—site of rapid neutron capture nucleosynthesis in the universe.

Leyfi:

Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Skrár

Þetta verk birtist í eftirfarandi safni/söfnum:


Fletta

Um vefinn

Reikningurinn minn