The Ep-Liso correlation: A new diagnostic tool for kilonova transients
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915742404837376 |
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| author | Farinelli, Ruben Cogato, Fabrizio Bulla, Mattia Singh, Paramvir Stratta, Giulia Rossi, Andrea Palazzi, Eliana Guidorzi, Cristiano Maiorano, Elisabetta Amati, Lorenzo Zhang, Bing Rezzolla, Luciano Frontera, Filippo |
| author_facet | Farinelli, Ruben Cogato, Fabrizio Bulla, Mattia Singh, Paramvir Stratta, Giulia Rossi, Andrea Palazzi, Eliana Guidorzi, Cristiano Maiorano, Elisabetta Amati, Lorenzo Zhang, Bing Rezzolla, Luciano Frontera, Filippo |
| contents | The AT2017gfo kilonova transient remains a unique multi-messenger event thanks to its proximity (z=0.00987) and the possibility to investigate time-resolved spectra, providing evidence of r-process nucleosynthesis. The kilonova signal was extensively studied in the spectral and time domains, giving key insights into the chemical composition and physical properties of the ejecta. Here, we report the discovery of a novel correlation between two fundamental observables: the peak energy of the EF_E spectrum, Ep, and the isotropic-equivalent luminosity, Liso. In particular, we show that up to about 2.5 days after the merger, the AT2017gfo spectrum evolves according to: log10[Ep/eV] = -0.13 (+0.02/-0.02) + 0.62 (+0.02/-0.02) * log10[Liso/(1e41 erg/s)] (68% C.L.) while in subsequent epochs, Ep remains almost constant with Liso, flattening around 1 eV. Exploiting simulations from a state-of-the-art radiative transfer code, we demonstrate that our kilonova model inherently predicts this peculiar correlation, suggesting a new diagnostic tool for comparing observables against simulations. Future kilonova observations will provide additional insight into the physics behind the Ep-Liso correlation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_14318 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Ep-Liso correlation: A new diagnostic tool for kilonova transients Farinelli, Ruben Cogato, Fabrizio Bulla, Mattia Singh, Paramvir Stratta, Giulia Rossi, Andrea Palazzi, Eliana Guidorzi, Cristiano Maiorano, Elisabetta Amati, Lorenzo Zhang, Bing Rezzolla, Luciano Frontera, Filippo High Energy Astrophysical Phenomena The AT2017gfo kilonova transient remains a unique multi-messenger event thanks to its proximity (z=0.00987) and the possibility to investigate time-resolved spectra, providing evidence of r-process nucleosynthesis. The kilonova signal was extensively studied in the spectral and time domains, giving key insights into the chemical composition and physical properties of the ejecta. Here, we report the discovery of a novel correlation between two fundamental observables: the peak energy of the EF_E spectrum, Ep, and the isotropic-equivalent luminosity, Liso. In particular, we show that up to about 2.5 days after the merger, the AT2017gfo spectrum evolves according to: log10[Ep/eV] = -0.13 (+0.02/-0.02) + 0.62 (+0.02/-0.02) * log10[Liso/(1e41 erg/s)] (68% C.L.) while in subsequent epochs, Ep remains almost constant with Liso, flattening around 1 eV. Exploiting simulations from a state-of-the-art radiative transfer code, we demonstrate that our kilonova model inherently predicts this peculiar correlation, suggesting a new diagnostic tool for comparing observables against simulations. Future kilonova observations will provide additional insight into the physics behind the Ep-Liso correlation. |
| title | The Ep-Liso correlation: A new diagnostic tool for kilonova transients |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.14318 |