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A brown dwarf mass donor in an accreting binary.

S P Littlefair¹, V S Dhillon, T R Marsh

¹Department of Physics and Astronomy, University of Sheffield, S3 7RH, UK. s.littlefair@shef.ac.uk

Science (New York, N.Y.)

|December 13, 2006

Summary

Researchers discovered a brown dwarf donor star in a binary system, confirming a key prediction of stellar evolution. This finding helps refine models of substellar objects in binary systems.

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Area of Science:

* Astronomy and astrophysics
* Stellar evolution and binary systems

Background:

* Binary star evolution theory predicts white dwarfs accreting from substellar donors.
* Such systems are difficult to detect due to challenges in observing low-mass donor stars against bright accretion. No substellar donor mass has been accurately measured previously.

Purpose of the Study:

* To verify the existence of white dwarf systems with substellar donor stars.
* To accurately measure the mass of an unseen donor star in an eclipsing binary system.

Main Methods:

* Application of a specialized technique for mass measurement in eclipsing binary systems.
* Reliable measurement of the mass of an unobserved donor star.

Main Results:

* Identification of a brown dwarf donor star with a mass of 0.052 ± 0.002 solar masses.
* The donor star's mass is relatively high for its orbital period.

Conclusions:

* The discovery confirms a long-standing prediction in binary star evolution.
* Current evolutionary models may need revision, potentially underestimating brown dwarf radii.