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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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An eccentric binary millisecond pulsar in the galactic plane.

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
PubMed
Summary
This summary is machine-generated.

Researchers discovered PSR J1903+0327, a millisecond pulsar in an unusual orbit with a solar-mass companion. This finding challenges conventional models of binary star evolution and pulsar formation.

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Area of Science:

  • Astronomy and Astrophysics
  • Compact Objects
  • Binary Systems

Background:

  • Binary pulsar systems are crucial for understanding stellar evolution and extreme physics.
  • Millisecond pulsars (MSPs) are rapidly rotating neutron stars.

Purpose of the Study:

  • To investigate the properties of a newly discovered radio pulsar, PSR J1903+0327.
  • To understand its unusual orbital characteristics and companion star.

Main Methods:

  • Conducted a survey using the Arecibo telescope to detect radio pulsars.
  • Performed infrared observations to identify the companion star.
  • Analyzed pulsar timing observations using relativistic methods.

Main Results:

  • Discovered PSR J1903+0327, a millisecond pulsar with a 2.15 ms period.
  • Observed a highly eccentric (e=0.44) 95-day orbit around a solar-mass companion.
  • Identified a possible main-sequence companion star.
  • Determined an unusually high pulsar mass of 1.74 ± 0.04 solar masses.

Conclusions:

  • The observed system challenges conventional binary stellar evolution models.
  • Alternative formation scenarios, such as globular cluster ejection or hierarchical triples, are proposed.
  • The high mass suggests unique formation or evolutionary pathways for this pulsar.