Low mass X-ray binaries with pre-main sequence companions

Abstract

In this Letter we examine the idea that a subset of short-period black-hole low-mass X-ray binaries could be powered by the mass transfer from pre-main sequence donors. As the star contracts towards the main sequence, the strong magnetic fields operate the magnetic braking which dissipates the orbital angular momentum, driving the binary to contact. We show that the periods and apparent donor spectral classes of the X-ray binaries with a pre-main sequence donor agree better with the available observations of black hole X-ray binaries than those of binaries with a main-sequence donor. This mechanism also explains, without the need for additional hypotheses, the roughly primordial abundance of Li detected in donor companions of black hole X-ray candidates in our Galaxy.

4 pages in emuapj style, 3 fugures, to appear in ApJL

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• Formation of Black Hole Low-Mass X-ray Binaries in Hierarchical Triple Systems
• Low Mass X-ray Binaries: The Effects of the Magnetic Braking Prescription
• Explosive Common-Envelope Ejection: Implications for Gamma-Ray Bursts and Low-Mass Black-Hole Binaries
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• The fast spiral-in of the companion star to the black hole XTE J1118+480
• Population Synthesis of Black Hole X-Ray Binaries
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• The isotopic 6Li/7Li ratio in Cen X-4 and the origin of Li in X-ray binaries
• Formation of Black Hole Low-Mass X-ray Binaries
• On the Neutron Star/Black Hole Mass Gap and Black Hole Searches
• Mass transfer and magnetic braking in Sco X-1
• Convection and rotation boosted prescription of magnetic braking: application to the formation of extremely low-mass white dwarfs
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• Globular Clusters and X-ray Point Sources in Centaurus A (NGC 5128)
• A Circumbinary Disk Model for the Rapid Orbital Shrinkage in Black Hole Low-Mass X-ray Binaries
• Unraveling the Formation History of the Black Hole X-ray Binary LMC X-3 from ZAMS to Present
• Formation of Sco X-1 induced by anomalous magnetic braking of Ap/Bp stars
• Aspherical supernova explosions and formation of compact black hole low-mass X-ray binaries
• Anomalous orbital expansion of low-mass X-ray binary 2A 1822-371: the existence of a circumbinary disk?
• On the rapid orbital expansion in the compact low-mass X-ray binary 2A 1822$-$371
• Are There Pre-Main-Sequence/Black Hole X-ray Binaries?