Intermediate-Mass Binary Pulsars: a New Class of Objects?
TL;DRAbstract
Approximately 4/5 of the ∼ 35 millisecond pulsars known in the disk of the Galaxy are in binary systems. The vast majority of these binary pulsars have (presumed) helium white dwarf companions with masses m 2 < 0.45 M ⊙ , spin periods P < 10 ms, and all are in extremely circular orbits (Fig. 1). In a search for millisecond pulsars with the Arecibo radio telescope, we have recently discovered PSR J1022+1001, a 16.45 ms pulsar in a 7.8 d orbit with a companion that is at least 0.73 M ⊙ , and is more likely as massive as 0.8−1.0M ⊙ ; and PSR J0621+1002, a 28.85 ms pulsar in an 8.3 d orbit with a companion at least 0.45 M ⊙ , and more likely with m 2 ≈ 0.54 M ⊙ . One other system, PSR J2145–0750, has P = 16.05 ms, orbital period P b = 6.8 d, and m 2 ≈ 0.50 M ⊙ (see Table 1).
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Approximately 4/5 of the ∼ 35 millisecond pulsars known in the disk of the Galaxy are in binary systems. The vast majority of these binary pulsars have (presumed) helium white dwarf companions with masses m 2 < 0.45 M ⊙ , spin periods P < 10 ms, and all are in extremely circular orbits (Fig. 1). In a search for millisecond pulsars with the Arecibo radio telescope, we have recently discovered PSR J1022+1001, a 16.45 ms pulsar in a 7.8 d orbit with a companion that is at least 0.73 M ⊙ , and is more likely as massive as 0.8−1.0M ⊙ ; and PSR J0621+1002, a 28.85 ms pulsar in an 8.3 d orbit with a companion at least 0.45 M ⊙ , and more likely with m 2 ≈ 0.54 M ⊙ . One other system, PSR J2145–0750, has P = 16.05 ms, orbital period P b = 6.8 d, and m 2 ≈ 0.50 M ⊙ (see Table 1).
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