Short-period pulsar planet at PSR J2322-2650

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Short-period pulsar planet at PSR J2322-2650

Post by Edasich on 14th December 2017, 4:58 am

Minimum mass below that of Jupiter and around 10 Jupiter masses even at low inclination and high (2 MSol) host star mass.

PSR J2322-2650 A low-luminosity millisecond pulsar with a planetary-mass companion

We present the discovery of a binary millisecond pulsar (MSP), PSR J2322−2650, found in the Southern section of the High Time Resolution Universe survey. This system contains a 3.5-ms pulsar with a ∼10−3 M⊙ companion in a 7.75-hour circular orbit. Follow-up observations at the Parkes and Lovell telescopes have led to precise measurements of the astrometric and spin parameters, including the period derivative, timing parallax, and proper motion. PSR J2322−2650 has a parallax of 4.41.2 mas, and is thus at an inferred distance of 230+90−50 pc, making this system a candidate for optical studies. We have detected a source of R≈26.4 mag at the radio position in a single R-band observation with the Keck Telescope, and this is consistent with the blackbody temperature we would expect from the companion if it fills its Roche lobe. The intrinsic period derivative of PSR J2322−2650 is among the lowest known, 4.4(4)10−22 s s−1, implying a low surface magnetic field strength, 4.0(4)107 G. Its mean radio flux density of 160 μJy combined with the distance implies that its radio luminosity is the lowest ever measured, 0.008(5) mJy kpc2. The inferred population of these systems in the Galaxy may be very significant, suggesting that this is a common MSP evolutionary path.
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Re: Short-period pulsar planet at PSR J2322-2650

Post by Lazarus on 14th December 2017, 5:20 am

More likely to be an ablated companion star than a planet, though. This may be common for low-luminosity millisecond pulsars.
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