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El arrastre del marco de Lense-Thirring inducido por una enana blanca de rotación rápida en un sistema de púlsares
V Venkatraman Krishnan1,2, M Bailes3,4, W van Straten5
1Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Melbourne, Victoria 3122, Australia. vkrishnan@mpifr-bonn.mpg.de.
Science (New York, N.Y.)
|February 1, 2020
Resumen
Detectamos cambios de inclinación orbital en un sistema de púlsares binarios, probablemente causados por efectos relativistas de una enana blanca que gira rápidamente. Este hallazgo apoya las teorías de la evolución binaria y las predicciones de la relatividad general.
Área de la Ciencia:
- * Astrofísica
- * Relatividad general
- * Evolución de las estrellas binarias
Sus antecedentes:
- * Los púlsares de radio en órbitas binarias excéntricas ofrecen información sobre la dinámica gravitacional y la evolución estelar.
- * El sistema PSR J1141-6545 presenta un joven púlsar de radio con una enana blanca masiva (WD) compañera formada antes del púlsar.
Objetivo del estudio:
- * Para investigar la evolución temporal de la inclinación orbital en el sistema binario PSR J1141-6545.
- * Para probar las predicciones de la relatividad general, específicamente la precesión Lense-Thirring (LT), en un sistema binario compacto.
Principales métodos:
- * Astronomía observacional para monitorear los parámetros orbitales del púlsar a lo largo del tiempo.
- * Modelado teórico para dar cuenta de los efectos newtonianos y relativistas en la órbita.
Principales resultados:
- * Se observó una evolución temporal en la inclinación orbital de PSR J1141-6545.
- * Se deduce que esta evolución es impulsada por una combinación del momento cuádrupolo newtoniano de la enana blanca y la precesión relativista Lense-Thirring (LT).
- * La precesión LT observada es consistente con una enana blanca que gira rápidamente.
Conclusiones:
- * La detección de la precesión LT proporciona una fuerte evidencia de los efectos de arrastre del marco relativista.
- * Los hallazgos apoyan un modelo evolutivo en el que la enana blanca acumuló materia del progenitor del púlsar, lo que condujo a su rápido giro (<200 segundos).
- * Este estudio valida la relatividad general en el régimen de campo fuerte y avanza en la comprensión de la evolución de las estrellas binarias.
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