X-PSI modeling of NICER/Chandra data for PSR J2124−3358 substantially prefers a helium atmosphere, giving M = 1.8 ± 0.5 M⊙ and Req = 11.7^{+2.6}_{-3.0} km with two slightly non-antipodal hot spots.
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A NICER view of the millisecond pulsar PSR J2124$-$3358: evidence for a helium atmosphere
X-PSI modeling of NICER/Chandra data for PSR J2124−3358 substantially prefers a helium atmosphere, giving M = 1.8 ± 0.5 M⊙ and Req = 11.7^{+2.6}_{-3.0} km with two slightly non-antipodal hot spots.