![]() A decade of transitional millisecond pulsars. Searching for exoplanets around X-ray binaries with accreting white dwarfs, neutron stars, and black holes. We also find that the locations of possible orbits are consistent with the survival of a planet bound to a mass-transfer binary. Instead, the data are well fit by a planet transit model in which the eclipser is most likely to be the size of Saturn. The latter are ruled out by the absence of changes in X-ray colours, save any with sharp density gradients that cannot be probed with our data. ![]() We examined a range of explanations for the observed X-ray dip, including a variety of transiting objects and enhancements in the density of gas and dust. We report on such a potential event in the X-ray binary M51-ULS-1 in the galaxy M51. An alternative approach is to study the temporal behaviour of X-rays emitted by bright extragalactic X-ray sources, where an orbiting planet would temporarily block the X-rays and cause a brief eclipse. Many lines of reasoning suggest that external galaxies should host planetary systems, but detecting them by methods typically used in our own Galaxy is not possible.
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