Video Experimental Relacionado
Updated: Jul 17, 2026
11:17
Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
Published on: February 9, 2017
Formación de la estructura de tres anillos alrededor de la supernova 1987A
1Communications Research Laboratory, Koganei-shi, Tokyo 184-8795, Japan. tanaka@crl.go.jp
Science (New York, N.Y.)
|April 16, 2002
Resumen
Una simulación magnetohidrodinámica reprodujo la estructura de tres anillos de la supernova 1987A modelando las interacciones del viento estelar. Esta interacción viento-viento entre las fases de supergigante roja y supergigante azul explica los anillos cósmicos observados.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Dinámica de fluidos computacional y dinámica de fluidos.
- La física del plasma es la física del plasma.
Sus antecedentes:
- Supernova (SN) 1987A exhibe una estructura distinta de tres anillos en su medio circunstelar.
- La transición de la supergigante roja (RSG) a la supergigante azul (BSG) fase antes de la explosión de supernova implica complejas dinámicas de viento estelar.
Objetivo del estudio:
- Para reproducir la estructura de tres anillos observada de SN 1987A utilizando simulaciones magnetohidrodinámicas (MHD).
- Investigar el papel de los vientos estelares anisotrópicos y los campos magnéticos en la configuración de las estructuras circunstelares.
Principales métodos:
- Simulación numérica de la magnetohidrodinámica.
- Modelación de las distribuciones anisotrópicas de densidad y velocidad de los vientos estelares.
- Incorporando los efectos de los campos magnéticos toroidales y los agujeros coronales.
Principales resultados:
- Reprodujo con éxito la estructura de tres anillos observada por el Telescopio Espacial Hubble.
- La simulación coincidía con el tamaño y la posición observados de los anillos.
- El efecto de pellizco magnético y la asimetría de densidad amplificada se identificaron como mecanismos clave.
Conclusiones:
- El estudio confirma que la interacción viento-viento durante la transición RSG-BSG puede generar las estructuras de anillo observadas.
- Los vientos estelares anisotrópicos, influenciados por los campos magnéticos, son cruciales para la formación de estas características.
- Las simulaciones de MHD proporcionan una poderosa herramienta para comprender la evolución de los restos de supernovas.
Videos de Conceptos Relacionados
01:33Atomic Structure
All matter is composed of atoms, the smallest individual units of elements. Each atom is made up of three subatomic particles: protons, neutrons, and electrons. Together, these three particles account for the mass and the charge of an atom.The History of Atomic TheoryThe first person to propose that everything on Earth is made up of tiny particles was the Greek philosopher Democritus, around 450 B.C. He used the term atomos, Greek for “indivisible,” from which the modern term “atom” is derived.
02:06Newman Projections
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
01:21Schwarzschild Radius and Event Horizon
No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
01:17Atomic Structure
The Greek philosopher Democritus proposed that everything on Earth is made up of tiny particles called atomos, Greek for "indivisible," from which the modern term "atom" is derived. In the 19th century, John Dalton proposed the atomic theory that is still largely correct today. He put forth five postulates to explain how atoms made up the world around us. (1) All matter is composed of infinitely small particles or atoms. (2) All atoms of a given element are identical to one another and (3) are...
01:14Gravitation Between Spherically Symmetric Masses
The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.