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Asymmetric dark matter under certain conditions could form compact star-likeobjects, which can be searched either through gravitational lensing or byobservation of gravitational waves from binaries involving such compactobjects. In this paper we analyze possible signatures of such dark stars madeof asymmetric dark matter with a portal to the Standard Model. We argue thatcompact dark stars could capture protons and electrons from the interstellarmedium, which then accumulate in the core of the dark star, forming a very hotgas that emits X-rays or $\gamma$-rays. For dark matter parameters compatiblewith current laboratory constraints, compact dark stars could be sufficientlyluminous to be detected at the Earth as point sources in the X-ray or$\gamma$-ray sky.

Proton capture in compact dark stars and observable implications