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Videos de Conceptos Relacionados

Radiation: Applications01:17

Radiation: Applications

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
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Phase Transitions: Sublimation and Deposition02:33

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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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Conformations of Butane02:20

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Unlike ethane and propane that have only two major conformations, butane has more than two conformers. The staggered form of butane in which the bulky methyl groups on the two carbons are placed on opposite sides, that is, at a dihedral angle of 180°, is the lowest energy, most stable form — called the anti conformer. This conformation is stabilized due to the absence of steric repulsion between the largely spaced out methyl groups. The other two staggered conformations are...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions
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Emisión de metano de una enana marrón fría

Jacqueline K Faherty1,2, Ben Burningham3, Jonathan Gagné4,5

  • 1Department of Astrophysics, American Museum of Natural History, New York, NY, USA. jfaherty@amnh.org.

Nature
|April 17, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Los astrónomos detectaron fuertes emisiones de metano de una enana marrón aislada, CWISEP J193518.59-154620.3 (W1935). Esto sugiere que los procesos aurorales pueden causar inversiones de temperatura atmosférica en tales objetos.

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Área de la Ciencia:

  • Ciencias exoplanetarias
  • Física de la atmósfera
  • Investigación de las enanas marrones

Sus antecedentes:

  • Las auroras se observan en planetas gigantes de nuestro Sistema Solar, con señales infrarrojas como el H3+ y el metano.
  • Las búsquedas anteriores de auroras infrarrojas en enanas marrones aisladas con firmas de auroras de radio no dieron resultados.
  • CWISEP J193518.59-154620.3 (W1935) es una enana marrón aislada con una temperatura de aproximadamente 482 K.

Objetivo del estudio:

  • Para investigar las características de emisión infrarroja de la enana marrón aislada W1935.
  • Para determinar las condiciones atmosféricas y las fuentes de energía potenciales que impulsan los fenómenos observados en W1935.

Principales métodos:

  • Utilizó el Telescopio Espacial James Webb (JWST) para las observaciones infrarrojas de W1935.
  • Modelado atmosférico para interpretar las características espectrales observadas, específicamente la emisión de metano.
  • Comparación de datos de observación con modelos para comprender los perfiles de temperatura y la composición atmosférica.

Principales resultados:

  • Se detectó una fuerte emisión de metano a 3.326 μm desde W1935 utilizando JWST.
  • El modelado atmosférico reveló una inversión de temperatura significativa de aproximadamente 300 K centrada en 1-10 mbar.
  • El modelo descartó la contribución de la emisión de H3+, a diferencia de los gigantes gaseosos del Sistema Solar.

Conclusiones:

  • La inversión de temperatura observada en la atmósfera de W1935 es inusual para una enana marrón aislada, lo que sugiere un mecanismo de calentamiento no estándar.
  • Los procesos aurorales son una explicación plausible para el calentamiento atmosférico y la inversión de temperatura.
  • La ausencia de emisión de H3+ es consistente con su rápida destrucción a las presiones más altas relevantes para la capa de emisión observada de W1935.