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La identificación interferométrica de una enana pre-marrón fue

Philippe André1, Derek Ward-Thompson, Jane Greaves

  • 1Laboratoire d'Astrophysique, Instrumentation et Modélisation (AIM), Commissariat à l'Energie Atomique (CEA)/Direction des Sciences de la Matière (DSM)-CNRS-Université Paris Diderot, Gif-sur-Yvette, France. philippe.andre@cea.fr

Science (New York, N.Y.)
|July 7, 2012
PubMed
Resumen

Los investigadores identificaron un núcleo de enana pre-marrón, apoyando la teoría de que las enanas marrones se forman como estrellas. Esta condensación de gas y polvo tiene una masa dentro del rango de las enanas marrones.

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Área de la Ciencia:

  • La astronomía y la astrofísica.
  • Formación Estelar Formación Estelar.
  • Enano marrón investigación de la investigación de las enanas marrones.

Sus antecedentes:

  • El mecanismo de formación de las enanas marrones, objetos con masas por debajo del límite de combustión de hidrógeno (0,075 masa solar), sigue siendo incierto.
  • Se debate si las enanas marrones se forman de manera similar a las estrellas de tipo solar o a través de procesos alternativos.

Objetivo del estudio:

  • Para investigar el proceso de formación de las enanas marrones.
  • Proporcionar evidencia observacional a favor o en contra de los modelos de formación de enanas marrones existentes.

Principales métodos:

  • Utilizó observaciones interferométricas milimétricas para detectar la emisión del continuo térmico.
  • Analizó la emisión para determinar la masa y el radio del objeto.
  • Las anchuras de las líneas espectrales medidas para inferir la masa dinámica.

Principales resultados:

  • Se identificó con éxito una condensación de gas y polvo de auto-gravitación en el régimen de masa de la enana marrón.
  • La emisión térmica del objeto indica una masa de aproximadamente 0.02 a 0.03 masas solares.
  • Un pequeño radio (<460 unidades astronómicas) y estrechas líneas espectrales sugieren una masa dinámica entre 0,015 y 0,02 masas solares.

Conclusiones:

  • El descubrimiento de este núcleo de enana pre-marrón proporciona un fuerte apoyo a los modelos en los que las enanas marrones se forman a través del mismo proceso que las estrellas que queman hidrógeno.
  • Este hallazgo ayuda a unificar la comprensión de las vías de formación de estrellas y enanas marrones.