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Ultra-compact X-ray binaries (UCXBs) are accreting systems with periods lessthan 1 hour, which qualifies them to contain a degenerate donor-companion. Onewould expect such systems to have the easiest theoretical explanation, comparedto other kinds of X-ray binaries. Nonetheless, current theory fails to explainhigh mass transfer (MT) rates in three recently well observed long-periodUCXBs. We find that this range of MT rates can be maintained if the donor is aremnant of an out-of-thermal-equilibrium naked core of a giant which wasrevealed in a very recent episode of a common envelope (CE) event.

Ultra-compact X-ray binaries with high luminosity: a key for a new scenario