Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Fengqiu Adam Dong, Tracy Clarke, Alice P. Curtin, Ajay Kumar, Ingrid Stairs
| Summary:
Neutron stars and white dwarfs are both dense remnants of post-main-sequence
stars. Pulsars, magnetars and strongly magnetised white dwarfs have all been
seen to been observed to exhibit coherent, pulsed radio emission in relation to
their rotational period. Recently, a new type of radio long period transient
(LPT) has been discovered. The bright radio emission of LPTs resembles that of
radio pulsars and magnetars. However, they pulse on timescales (minutes) much
longer than previously seen. While minute timescales are common rotation
periods for white dwarfs, LPTs are much brighter than the known pulsating white
dwarfs, and dipolar radiation from isolated (as opposed to binary) magnetic
white dwarfs has yet to be observed. Here, we report the discovery of a new
$sim$421~s LPT, CHIME J0630+25, using the CHIME/FRB and CHIME/Pulsar
instruments. We used standard pulsar timing techniques and obtained a
phase-coherent timing solution which yielded limits on the inferred magnetic
field and characteristic age. CHIME J0630+25 is remarkably nearby ($170 pm
80$~pc), making it the closest LPT discovered to date.
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