Strange quark matter strangelets with low baryon number can form stable self-gravitating sub-stellar objects, predicting a new class of ultra-compact candidates with a density gap from ordinary planets and brown dwarfs.
B., & Thorne, K
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The 3.8 keV feature implies a compactness for 4U 1820-30 that overlaps only marginally with NICER EoS contours if maximum mass is capped at 2.3 solar masses, creating tension with touchdown-flux estimates.
citing papers explorer
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Sub-stellar Strange Quark Matter Objects: Predicting a New Class of Highly-Compact Candidates
Strange quark matter strangelets with low baryon number can form stable self-gravitating sub-stellar objects, predicting a new class of ultra-compact candidates with a density gap from ordinary planets and brown dwarfs.
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The mass of the neutron star in 4U 1820-30 revisited
The 3.8 keV feature implies a compactness for 4U 1820-30 that overlaps only marginally with NICER EoS contours if maximum mass is capped at 2.3 solar masses, creating tension with touchdown-flux estimates.