AstronomyAstronomers observe X-ray binary XTE J1739−285 during recent outbursts

Astronomers observe X-ray binary XTE J1739−285 during recent outbursts

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The highest panel reveals the two–20 keV MAXI/GSC gentle curve of XTE J1739−285 throughout its 2019–2020 outburst. The hardness ratio is plotted within the backside panel. Credit score: Beri et al, 2023

Utilizing AstroSat and NuSTAR space telescopes, astronomers have noticed an X-ray binary often known as XTE J1739−285 throughout its current interval of bursting exercise. Outcomes of the observational marketing campaign, printed March 23 on the arXiv pre-print server, yield essential insights into the habits of this method.

X-ray binaries (XRBs) include a traditional star or a white dwarf transferring mass onto a compact neutron star or a black hole. Based mostly on the mass of the companion star, astronomers divide them into low-mass X-ray binaries (LMXB) and high-mass X-ray binaries (HMXB).

Some LMXBs exhibit transient outbursts, throughout which a rise in X-ray luminosities is noticed. When these outbursts are characterised as Kind I X-ray bursts—thermonuclear explosions happening on the floor layers of neutron stars—they clearly verify the presence of neutron stars in such binaries.

Found in 1999 by the Rossi X-ray Timing Explorer (RXTE), XTE J1739−285 is a transient LMXB with a neutron star companion. Since its discovery, the supply has skilled dozens of X-ray bursts. Extra lately, in 2019, it entered a rebrightening phase, throughout which new X-ray outbursts have been recognized.

A group of astronomers led by Aru Beri of Indian Institute of Science Schooling and Analysis (IISER) Mohali in India, began to look at XTE J1739−285 in October 2019, when the system was in its bursting interval. They employed India’s AstroSat and NASA’s NuSTAR (Nuclear Spectroscopic Telescope Array) spacecraft to carry out an in depth timing and spectral examine of XTE J1739−285.

“On this paper, we report our outcomes from AstroSat and NuSTAR observations of XTE J1739−285 throughout its 2019 and 2020 outbursts. We now have carried out an in depth timing and spectral examine of this supply,” the researchers wrote.

The X-ray gentle curves throughout observations of XTE J1739−285 carried out in 2019 by Beri’s group point out the presence of flares. Furthermore, the observations recognized accretion-powered X-ray pulsations at 386 Hz throughout very quick intervals (from 0.5 to 1 s) of those X-ray flares, which makes XTE J1739−285 an intermittent X-ray pulsar.

AstroSat observations of XTE J1739−285 in 2020 unveiled the presence of a thermonuclear X-ray burst, which led to the detection of coherent burst oscillations at 383 Hz through the burst’s decay phase. Due to this fact, XTE J1739−285 seems to be one of some neutron star LMXBs experiencing each nuclear- and accretion-powered pulsations.

The observations additionally detected a quasi-periodic oscillation (QPO) at 0.83 Hz with root imply sq. (rms) variability of about 7% through the laborious state of XTE J1739−285 in 2020. The astronomers famous {that a} comparable characteristic was not discovered through the delicate state of the supply, within the previous yr. As well as, the X-ray spectroscopy revealed important adjustments within the X-ray spectra of XTE J1739−28 through the 2019 and 2020 outburst.

Extra info:
Aru Beri et al, AstroSat and NuSTAR observations of XTE J1739-285 through the 2019-2020 outburst, arXiv (2023). DOI: 10.48550/arxiv.2303.13085

Journal info:
arXiv


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Astronomers observe X-ray binary XTE J1739−285 throughout current outbursts (2023, March 30)
retrieved 30 March 2023
from https://phys.org/information/2023-03-astronomers-x-ray-binary-xte-j1739285.html

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