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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Un pulsar binario milisegundo excéntrico en el plano galáctico.

David J Champion¹, Scott M Ransom, Patrick Lazarus

¹Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada. David.Champion@atnf.csiro.au

Science (New York, N.Y.)

|May 17, 2008

Resumen

Los investigadores descubrieron PSR J1903+0327, un púlsar de milisegundos en una órbita inusual con un compañero de masa solar. Este hallazgo desafía los modelos convencionales de la evolución de las estrellas binarias y la formación de púlsares.

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Área de la Ciencia:

La astronomía y la astrofísica.
Objetos compactos Objetos compactos.
Los sistemas binarios son sistemas binarios.

Sus antecedentes:

Los sistemas de púlsares binarios son cruciales para comprender la evolución estelar y la física extrema.
Los púlsares de milisegundos (MSP) son estrellas de neutrones que giran rápidamente.

Objetivo del estudio:

Para investigar las propiedades de un pulsar de radio recién descubierto, PSR J1903+0327.
Para entender sus inusuales características orbitales y su estrella compañera.

Principales métodos:

Realizó una encuesta utilizando el telescopio de Arecibo para detectar pulsares de radio.
Realizó observaciones infrarrojas para identificar la estrella compañera.
Analizó las observaciones de cronometraje de pulsares utilizando métodos relativistas.

Principales resultados:

Descubrió PSR J1903+0327, un púlsar de milisegundos con un período de 2,15 ms.
Se observó una órbita muy excéntrica (e=0.44) de 95 días alrededor de un compañero de masa solar.
Identificó una posible estrella compañera de la secuencia principal.
Se determinó una masa pulsar inusualmente alta de 1,74 ± 0,04 masas solares.

Conclusiones:

El sistema observado desafía los modelos convencionales de evolución estelar binaria.
Se proponen escenarios de formación alternativos, como la eyección de cúmulos globulares o triples jerárquicos.
La gran masa sugiere una formación única o vías evolutivas para este púlsar.