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Article Dans Une Revue The Astrophysical journal letters Année : 2018

NICER Discovers the Ultracompact Orbit of the Accreting Millisecond Pulsar IGR J17062-6143

T.E. Strohmayer
  • Fonction : Auteur
Z. Arzoumanian
  • Fonction : Auteur
S. Bogdanov
  • Fonction : Auteur
P.M. Bult
  • Fonction : Auteur
D. Chakrabarty
  • Fonction : Auteur
T. Enoto
K.C. Gendreau
  • Fonction : Auteur
A.K. Harding
  • Fonction : Auteur
W.C. G. Ho
  • Fonction : Auteur
J. Homan
  • Fonction : Auteur
G.K. Jaisawal
  • Fonction : Auteur
L. Keek
  • Fonction : Auteur
M. Kerr
  • Fonction : Auteur
S. Mahmoodifar
  • Fonction : Auteur
C.B. Markwardt
  • Fonction : Auteur
S.M. Ransom
  • Fonction : Auteur
P.S. Ray
  • Fonction : Auteur
R. Remillard
  • Fonction : Auteur
M.T. Wolff
  • Fonction : Auteur

Résumé

We present results of recent Neutron Star Interior Composition Explorer observations of the accreting millisecond X-ray pulsar IGR J17062-6143 that show that it resides in a circular, ultracompact binary with a 38 minute orbital period. NICER observed the source for approximately 26 ksec over a 5.3 day span in 2017 August, and again for 14 and 11 ksec in 2017 October and November, respectively. A power spectral analysis of the August exposure confirms the previous detection of pulsations at 163.656 Hz in Rossi X-ray Timing Explorer data, and reveals phase modulation due to orbital motion of the neutron star. A coherent search for the orbital solution using the Z^2 method finds a best-fitting circular orbit with a period of 2278.21 s (37.97 min), a projected semi-major axis of 0.00390 lt-sec, and a barycentric pulsar frequency of 163.6561105 Hz. This is currently the shortest known orbital period for an AMXP. The mass function is 9.12 e-8} solar masses, presently the smallest known for a stellar binary. The minimum donor mass ranges from about 0.005 - 0.007 solar masses, for a neutron star mass from 1.2 - 2 solar masses. Assuming mass transfer is driven by gravitational radiation, we find donor mass and binary inclination bounds of 0.0175 - 0.0155 solar masses and 19 deg < i < 27.5 deg, where the lower and upper bounds correspond to 1.4 and 2 solar mass neutron stars, respectively. Folding the data accounting for the orbital modulation reveals a sinusoidal profile with fractional amplitude 2.04 +- 0.11 % (0.3 - 3.2 keV).

Dates et versions

hal-01871728 , version 1 (11-09-2018)

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Citer

T.E. Strohmayer, Z. Arzoumanian, S. Bogdanov, P.M. Bult, D. Chakrabarty, et al.. NICER Discovers the Ultracompact Orbit of the Accreting Millisecond Pulsar IGR J17062-6143. The Astrophysical journal letters, 2018, 858 (2), pp.L13. ⟨10.3847/2041-8213/aabf44⟩. ⟨hal-01871728⟩
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