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.
Birth Events, Masses and the Maximum Mass ofCompactStars,in:Vasconcellos,C.A.Z.(Ed.),Astrophysicsinthe XXI Century with Compact Stars
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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.