Why is this a Gas Giant?Your planet has 98.0% hydrogen and helium, combined with a mass of 4000.0x Earth, which exceeds the gas giant threshold.
Gas giants form when massive cores capture enormous atmospheres of light gases. They typically form beyond the 'frost line' where volatiles can condense.
Matched on physical properties only — but pulsar planets are real: the first exoplanets ever confirmed (PSR B1257+12, 1992) orbit a neutron star.Discovered 2009 via eclipse timing variations · 998 light-years awaySource: NASA Exoplanet Archive