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KOI-3278: a self-lensing binary star system.

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Astronomers discovered a rare self-lensing binary star system using Kepler data. A white dwarf’s gravity magnifies its Sun-like companion, revealing its mass.

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Area of Science:

  • Astronomy and Astrophysics
  • Stellar Evolution
  • Exoplanet Research

Background:

  • Over 40% of Sun-like stars exist in binary or multistar systems.
  • Stellar remnants in edge-on binaries can gravitationally magnify companions (self-lensing).

Purpose of the Study:

  • To detect and characterize a self-lensing binary star system.
  • To constrain the mass of a white dwarf using gravitational magnification.

Main Methods:

  • Analysis of Kepler spacecraft data.
  • Modeling light curve pulses as gravitational microlensing.
  • Application of Kepler's laws and stellar models.

Main Results:

  • Detection of a self-lensing system with a white dwarf and Sun-like star.
  • Observed a 5-hour pulse of 0.1% amplitude every orbital period.
  • Constrained the white dwarf mass to approximately 63% of the Sun's mass.

Conclusions:

  • The detected system confirms theoretical predictions of gravitational magnification in binary stars.
  • This discovery provides a new method for studying white dwarf physics.
  • Further research on such systems will advance understanding of binary star evolution.