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Título: | Timing analysis of the 2022 outburst of the accreting millisecond X-ray pulsar SAX J1808.4-3658: Hints of an orbital shrinking |
Autor: | Illiano, Giulia; Papitto, Alessandro CSIC ORCID; Sanna, Andrea; Bult, Peter; Ambrosino, Filippo; Miraval Zanon, Arianna; Coti Zelati, Francesco CSIC ORCID ; Stella, Luigi; Altamirano, Diego CSIC ORCID; Baglio, Maria Cristina; Bozzo, Enrico; Burderi, Luciano; Martino, Domitilla de; Di Marco, Alessandro; Salvo, Tiziana di; Ferrigno, Carlo; Loktev, Vladislav; Marino, Alessio CSIC ORCID; Ng, Mason; Pilia, Maura; Poutanen, Juri; Salmi, Tuomo | Fecha de publicación: | 2023 | Editor: | IOP Publishing | Citación: | Astrophysical Journal Letters 942(2): L40 (2023) | Resumen: | We present a pulse timing analysis of NICER observations of the accreting millisecond X-ray pulsar SAX J1808.4−3658 during the outburst that started on 2022 August 19. Similar to previous outbursts, after decaying from a peak luminosity of ;1 × 1036 erg s−1 in about a week, the pulsar entered a ∼1 month long reflaring stage. Comparison of the average pulsar spin frequency during the outburst with those previously measured confirmed the long-term spin derivative of V- SD= -(1.15 +/- 0.06) x 10(-15) Hz s−1, compatible with the spin-down torque of a ≈1026 G cm3 rotating magnetic dipole. For the first time in the last twenty years, the orbital phase evolution shows evidence for a decrease of the orbital period. The long-term behavior of the orbit is dominated by an ∼11 s modulation of the orbital phase epoch consistent with a ∼21 yr period. We discuss the observed evolution in terms of a coupling between the orbit and variations in the mass quadrupole of the companion star. | Versión del editor: | https://doi.org/10.3847/2041-8213/acad81 | URI: | http://hdl.handle.net/10261/337530 | DOI: | 10.3847/2041-8213/acad81 | E-ISSN: | 2041-8213 |
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