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Las auroras ópticas y de radio impulsadas por la magnetosfera al final de la secuencia principal estelar
G Hallinan1, S P Littlefair2, G Cotter3
1California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA.
Nature
|July 31, 2015
Resumen
Los astrónomos detectaron emisiones de radio y auroras ópticas de una estrella, impulsadas por su magnetosfera. Este descubrimiento sugiere que las auroras son comunes y pueden ser más poderosas que las de Júpiter, influyendo potencialmente en el clima de las enanas marrones.
Área de la Ciencia:
- * Ciencias planetarias
- * Astrofísica
- * Física del espacio
Sus antecedentes:
- * Las auroras se observan en planetas magnetizados, impulsados por corrientes magnetosféricas y electrones precipitados.
- * Los gigantes gaseosos exhiben emisiones de radio, infrarrojos, ópticos, UV y rayos X debido a las interacciones atmosféricas.
- * La actividad magnética estelar generalmente se origina en las atmósferas más bajas, a diferencia de las auroras planetarias.
Objetivo del estudio:
- * Para reportar la detección simultánea de emisiones de radio y auroras ópticas de un objeto cerca del límite estrella-enana marrón.
- * Investigar la fuente de energía y las características de estas emisiones, comparándolas con las auroras planetarias.
- * Explorar las implicaciones de estos hallazgos para la comprensión de las magnetosferas y los fenómenos estelares/subestelares.
Principales métodos:
- * Observaciones espectroscópicas simultáneas por radio y por óptica.
- * Análisis de las emisiones aurorales de una estrella al final de la secuencia principal estelar.
- * Caracterización de los sistemas de corriente magnetosférica y acoplamiento de energía.
Principales resultados:
- * Detección de las emisiones radiales y ópticas de las auroras provenientes del objeto observado.
- * Confirmación de que estas auroras son impulsadas por corrientes magnetosféricas originadas en la magnetosfera externa.
- * La energía disipada es al menos cuatro órdenes de magnitud mayor que la magnetosfera de Júpiter.
- * Aurorae identificado como una firma potencialmente ubicua de las magnetosferas a gran escala.
Conclusiones:
- * Las auroras no se limitan a los planetas y pueden ocurrir en objetos en el extremo de la secuencia principal estelar.
- * Los procesos magnetosféricos en estos objetos pueden impulsar auroras con luminosidades significativamente más altas que las observadas en nuestro Sistema Solar.
- * Estos sistemas de corrientes magnetosféricas pueden influir en los fenómenos climáticos en las enanas marrones.
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