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2010•Astronomy and AstrophysicsOpen access

The spin and orbit of the newly discovered pulsar IGR J17480-2446

Alessandro Papitto, A. D’Aì, S. Motta, A. Riggio, L. Burderi, T. Di Salvo, T. Belloni, R. Iaria

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Abstract

We present an analysis of the spin and orbital properties of the newly discovered accreting pulsar IGR J17480-2446, located in the globular cluster Terzan 5. Considering the pulses detected by the Rossi X-ray Timing Explorer at a period of 90.539645(2) ms, we derive a solution for the 21.27454(8) hr binary system. The binary mass function is estimated to be 0.021275(5) M⊙, indicating a companion star with a mass larger than 0.4 M⊙. The X-ray pulsar spins up while accreting at a rate of between 1.2 and 1.7 × 10-12 Hz s-1, in agreement with the accretion of disc matter angular momentum given the observed luminosity.

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We present an analysis of the spin and orbital properties of the newly discovered accreting pulsar IGR J17480-2446, located in the globular cluster Terzan 5. Considering the pulses detected by the Rossi X-ray Timing Explorer at a period of 90.539645(2) ms, we derive a solution for the 21.27454(8) hr binary system. The binary mass function is estimated to be 0.021275(5) M⊙, indicating a companion star with a mass larger than 0.4 M⊙. The X-ray pulsar spins up while accreting at a rate of between 1.2 and 1.7 × 10-12 Hz s-1, in agreement with the accretion of disc matter angular momentum given the observed luminosity.

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Available abstract

We present an analysis of the spin and orbital properties of the newly discovered accreting pulsar IGR J17480-2446, located in the globular cluster Terzan 5. Considering the pulses detected by the Rossi X-ray Timing Explorer at a period of 90.539645(2) ms, we derive a solution for the 21.27454(8) hr binary system. The binary mass function is estimated to be 0.021275(5) M⊙, indicating a companion star with a mass larger than 0.4 M⊙. The X-ray pulsar spins up while accreting at a rate of between 1.2 and 1.7 × 10-12 Hz s-1, in agreement with the accretion of disc matter angular momentum given the observed luminosity.

Key concepts: Physics, Neutron star, Pulsar, Astrophysics, Globular cluster, RADIUS, Millisecond pulsar, X-ray pulsar

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