Study of recently discovered Be/X-ray pulsar MAXI J0655-013 using NuSTAR

Abstract

We study the recently discovered Be/X-ray pulsar MAXI J0655--013 using the 2022 \emph{NuSTAR} observations. The paper is the first detailed study of the timing and spectral properties of the source. The pulse profiles of the pulsar vary with energy. The pulsed fraction is found to increase monotonically with energy. In between the two \emph{NuSTAR} observations, a large spin-up rate of $\sim$ -1.23 s d${}^{-1}$ is observed, which can be due to large spin-up torque acting on the pulsar during an outburst. Such a large spin-up rate is observed for the first time in an X-ray pulsar during an outburst. The variation of the spin period with time can be employed to obtain the orbital parameters of the binary system, and we found the orbital period to be $\sim$ 27.9 d. The second \emph{NuSTAR} observation is done in a low luminosity state ($L_X\sim$3.9$\times$10${}^{34}$ \unilum). We have detected the pulsation of the pulsar in such a low luminosity state. In such a low luminosity state, the pulsar MAXI J0655--013 might be accreting from the cold disk.

arXiv comment8 pages, 8 figures, accepted for publication in MNRAS

References in corpus (27)

• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• Observations of Accreting Pulsars
• Be/X-ray binaries
• Spectral Formation in Accreting X-Ray Pulsars: Bimodal Variation of the Cyclotron Energy with Luminosity
• Calibration of the NuSTAR High Energy Focusing X-ray Telescope
• On the maximum accretion luminosity of magnetized neutron stars: connecting X-ray pulsars and ultraluminous X-ray sources
• The critical accretion luminosity for magnetized neutron stars
• Patterns of variability in Be/X-ray pulsars during giant outbursts
• The Ups & Downs of Accreting X-Ray Pulsars: Decade-long observations with the Fermi Gamma-Ray Burst Monitor
• Equilibrium spin pulsars unite neutron star populations
• Origin of Two Types of X-Ray Outbursts in Be/X-Ray Binaries. I. Accretion Scenarios
• Stable accretion from a cold disc in highly magnetized neutron stars
• Could 2S 0114+650 be a magnetar?
• SXP 1062, a young Be X-ray binary pulsar with long spin period; Implications for the neutron star birth spin
• Dramatic spectral transition of X-ray pulsar GX 304-1 in low luminous state
• Discovery of a Be/X-ray pulsar binary and associated supernova remnant in the Wing of the SMC
• ROSAT HRI catalogue of X-ray sources in the SMC region
• Strong outburst activity of the X-ray pulsar X Persei during 2001-2011
• Accreting magnetars: a new type of high-mass X-ray binaries?
• Suzaku view of Be/X-ray binary pulsar GX 304-1 during Type I X-ray outbursts
• Exploring the Small Magellanic Cloud to the Faintest X-ray Fluxes: Source Catalog, Timing and Spectral Analysis
• Swift observations of SMC X-3 during its 2016-2017 super-Eddington outburst
• Could SXP 1062 be an Accreting Magnetar?
• NuSTAR discovery of a cyclotron absorption line in the transient X-ray pulsar 2S 1553-542
• Exploring accretion theory with X-ray binaries in the SMC
• MAXI and NuSTAR observations of the faint X-ray transient MAXI J1848-015 in the GLIMPSE-C01 Cluster