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Updated: Apr 14, 2026

Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

The first extragalactic ultra-compact X-ray binary: A candidate black hole-white dwarf system.

Qian-Qi Ma¹, Jiachang Zhang^2,3, Wei-Min Gu¹

¹Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, China.

Innovation (Cambridge (Mass.))

|April 13, 2026

Summary

M31 UCXB-1 is the brightest ultra-compact X-ray binary (UCXB) discovered, likely a black hole-white dwarf system. It exhibits the shortest orbital period and strongest gravitational wave emission among known UCXBs.

Keywords:

X-ray binary stars black holes gravitational wave sources white dwarf stars

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Area of Science:

* Astrophysics
* High-energy astrophysics
* Compact objects

Background:

* M31 UCXB-1 is a luminous X-ray source in the M31 galaxy.
* It exhibits an eclipsing signal suggesting an ultra-compact X-ray binary (UCXB).

Purpose of the Study:

* To investigate the nature of M31 UCXB-1.
* To determine its classification as a black hole/neutron star-white dwarf (BH/NS-WD) UCXB.

Main Methods:

* Analysis of XMM-Newton and Chandra X-ray observations.
* Theoretical modeling of luminosity-orbital period relations.
* Spectral analysis to determine the primary object's nature.

Main Results:

* M31 UCXB-1 displays a high X-ray luminosity and a 465 s orbital period.
* The source aligns with the BH/NS-WD UCXB luminosity-orbital period relation.
* Spectral analysis favors a black hole primary over a neutron star.

Conclusions:

* M31 UCXB-1 is identified as a black hole-white dwarf (BH-WD) system.
* It possesses the shortest orbital period and potentially strongest gravitational wave emission among known UCXBs.
* The system likely hosts the most massive white dwarf discovered in UCXBs.