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- W3100127960 abstract "The true ground state of hadronic matter may be strange quark matter (SQM). Consequently, the observed pulsars may actually be strange quark stars, but not neutron stars. However, proving or disproving the SQM hypothesis still remains to be a difficult problem, due to the similarity between the macroscopical characteristics of strange quark stars and neutron stars. Here we propose a hopeful method to probe the existence of strange quark matter. In the frame work of the SQM hypothesis, strange quark dwarfs and even strange quark planets can also stably exist. Noting that SQM planets will not be tidally disrupted even when they get very close to their host stars due to their extreme compactness, we argue that we could identify SQM planets by searching for very close-in planets among extrasolar planetary systems. Especially, we should keep our eyes on possible pulsar planets with orbital radius less than $sim 5.6 times 10^{10}$~cm and period less than $sim 6100$~s. A thorough search in the currently detected $sim 2950$ exoplanets around normal main sequence stars has failed to identify any stable close-in objects that meet the SQM criteria, i.e. lying in the tidal disruption region for normal matter planets. However, the pulsar planet PSR J1719-1438B, with an orbital radius of $sim 6 times 10^{10}$~cm and orbital period of $7837$~s, is encouragingly found to be a good candidate." @default.
- W3100127960 created "2020-11-23" @default.
- W3100127960 creator A5026200713 @default.
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- W3100127960 date "2017-10-20" @default.
- W3100127960 modified "2023-09-26" @default.
- W3100127960 title "Searching for Strange Quark Matter Objects in Exoplanets" @default.
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- W3100127960 doi "https://doi.org/10.3847/1538-4357/aa8b63" @default.
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