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La polarización óptica de choques de corriente estelar en un evento de interrupción de marea
I Liodakis1, K I I Koljonen1,2,3, D Blinov4,5
1Finnish Center for Astronomy with the European Southern Observatory, University of Turku, FI-20014 Turku, Finland.
Science (New York, N.Y.)
|May 11, 2023
Resumen
Estudiamos un evento de disrupción de marea (TDE) y encontramos luz óptica altamente polarizada. Esta polarización probablemente se origina en choques de disco de acreción, no en un chorro relativista, ya que las observaciones de radio fueron negativas.
Área de la Ciencia:
- Astronomía y astrofísica
- Física de los agujeros negros
- Cosmología de observación
Sus antecedentes:
- Los eventos de disrupción de marea (TDE) involucran agujeros negros supermasivos (SMBH) que destruyen estrellas.
- Los discos de acreción formados por escombros estelares pueden lanzar chorros relativistas.
- La comprensión de los mecanismos de emisión de TDE es crucial para los estudios de SMBH.
Objetivo del estudio:
- Investigar las propiedades de emisión del TDE AT 2020mot.
- Determinar el origen de la alta polarización óptica observada.
- Probar la hipótesis de la formación de chorros relativistas en las TDE.
Principales métodos:
- Se han realizado observaciones de polarimetría óptica de AT 2020mot.
- Los datos de polarización analizados para medir el grado de polarización lineal.
- Se realizaron observaciones por radio para buscar la emisión de chorros hasta 8 meses después del pico óptico.
Principales resultados:
- Se observó una polarización lineal máxima de 25 ± 4% en la luz óptica.
- Esta polarización es consistente con la radiación del sincrotrón.
- No se detectó ninguna emisión de radio correspondiente de un chorro relativista.
Conclusiones:
- La alta polarización óptica probablemente proviene de los choques del disco de acreción.
- La ausencia de emisión de radio desafía el modelo de chorro típico para TDE.
- Los procesos de formación de discos de acreción pueden ser responsables de la emisión óptica polarizada en las TDE.
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