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Detección de rayos X de una nova en la fase de bola de fuego
Ole König1, Jörn Wilms2, Riccardo Arcodia3
1Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Bamberg, Germany. ole.koenig@fau.de.
Nature
|May 13, 2022
Resumen
Los astrónomos observaron un breve y brillante destello de rayos X de la nova YZ Reticuli, confirmando lo predicho
Área de la Ciencia:
- Astronomía y astrofísica
- Evolución estelar
Sus antecedentes:
- Las novas son el resultado de reacciones termonucleares fuera de control en enanas blancas en acreción.
- Los modelos teóricos predicen una fase preóptica de "bola de fuego" caracterizada por una emisión suave de rayos X.
Objetivo del estudio:
- Para detectar y caracterizar la fase predicha de "bola de fuego" de rayos X que precede a una erupción de nova clásica.
- Para confirmar las predicciones teóricas con respecto a la naturaleza de esta emisión temprana.
Principales métodos:
- Observación de la clásica nova galáctica YZ Reticuli utilizando telescopios de rayos X.
- Monitoreo de la emisión de rayos X en las horas previas al brillo óptico.
- Análisis espectral de la emisión de rayos X detectada.
Principales resultados:
- Un brillante y suave destello de rayos X fue detectado 11 horas antes del brillo óptico de YZ Reticuli.
- No se detectó ninguna fuente de rayos X en las 8 horas que rodearon el evento.
- El espectro de rayos X es consistente con una temperatura de cuerpo negro de ~ 3.27 × 10 ^ 5 K, que irradia a la luminosidad de Eddington.
Conclusiones:
- El destello de rayos X observado proporciona la primera evidencia observacional de la fase predicha de "bola de fuego" en las novas clásicas.
- Las propiedades del flash se alinean con las expectativas teóricas para la emisión de una fotoesfera enana blanca cerca del límite de Eddington.
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