Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: , , , ,
| Summary:
We report the discovery of CHIME J1634+44, a Long Period Radio Transient
(LPT) unique for two aspects: it is the first known LPT to emit fully
circularly polarized radio bursts, and it is the first LPT with a significant
spin-up. Given that high circular polarization ($>90$%) has been observed in
FRB~20201124A and in some giant pulses of PSR~B1937+21, we discuss the
implications of the high circular polarization of CHIME J1634+44 and conclude
its emission mechanism is likely to be “pulsar-like”. While CHIME J1634+44
has a pulse period of 841 s, its burst arrival patterns are indicative of a
secondary 4206 s period, probably associated with binary activity. The timing
properties suggest it has a significantly negative period derivative of
$dotP=-9.03(0.11)$ s s$^-1$. Few systems have been known to spin-up, most
notably transitional millisecond pulsars and cataclysmic binaries, both of
which seem unlikely progenitors for CHIME J1634+44. If the period was only
associated with the spin of the object, then the spin up is likely generated by
accretion of material from a companion. If, however, the radio pulse period and
the orbital period are locked, as appears to be the case for two other LPTs,
the spin up of CHIME J1634+44 could be driven by gravitational wave radiation.
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