A persistent ultraviolet outflow from an accreting neutron star binary transient

Segura, N. Castro; Knigge, Christian; Long, Knox S.; Altamirano, D.; Padilla, M. Armas; Bailyn, Charles D.; Buckley, D.; Buisson, D. J. K.; Casares, J.; Charles, P. A.; Combi, J. A.; Cúneo, V. A.; Degenaar, N.; Palacio, Santiago; Trigo, María Díaz; Fender, R. P.; Gandhi, P.; Georganti, M.; Gutiérrez, C. P.; Santisteban, J. V. Hernández; Jiménez-Ibarra, F.; Matthews, James H.; Méndez, Mariano; Middleton, Matthew; Muñoz-Darias, T.; Arabacı, M. Özbey; Pahari, Mayukh; Rhodes, L.; Russell, Thomas; Scaringi, Simone; Eijnden, J. van den; Vasilopoulos, Georgios; Vincentelli, Federico; Wiseman, P.

doi:10.1038/s41586-021-04324-2

Cited by 33 publications

(5 citation statements)

References 37 publications

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“…XRB winds are also observed in X-rays (e.g. Ponti et al 2012) and in the ultraviolet (Castro Segura et al 2022) and infrared (Sánchez-Sierras & Muñoz-Darias 2020) regimes with similar observational properties (e.g. velocities).…”

Section: Outflows In Awds Versus Xrbsmentioning

confidence: 85%

Unveiling optical signatures of outflows in accreting white dwarfs

Cúneo,

Muñoz-Darias,

Jiménez-Ibarra

et al. 2023

A&A

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Accreting white dwarfs are known to show signatures of wind-type outflows in the ultraviolet. However, at optical wavelengths, wind detections have only been reported for a few sources. We present GTC-10.4 m optical spectroscopy of four accreting white dwarfs (BZ Cam, V751 Cyg, MV Lyr, and V425 Cas) observed during luminous epochs, when their optical emission is expected to be dominated by the accretion disc. Our analysis focuses on four emission lines: Hα and He Iλ5876, λ6678, and λ7065. Line profiles are complex and variable on short (minutes) and long (days to weeks) timescales, with transient absorption and emission components. Among them, we detect strong blueshifted absorptions at ≳1000 km s−1. These high-velocity components, present only in the blue wing of the emission lines, are observed in all four sources and could be associated with accretion disc winds. For MV Lyr and V425 Cas, these would represent the first detection of optical outflows in these objects, while in the cases of BZ Cam and V751 Cyg, the presence of outflows has been previously reported. This study suggests that, in addition to ultraviolet winds, optical outflows might also be common in accreting white dwarfs. We discuss the observational properties of these winds and their possible similarity to those detected in accreting black holes and neutrons stars.

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Section: Outflows In Awds Versus Xrbsmentioning

confidence: 85%

Unveiling optical signatures of outflows in accreting white dwarfs

Cúneo,

Muñoz-Darias,

Jiménez-Ibarra

et al. 2023

A&A

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“…Though a disk wind has not been identified in Ser X-1 previously, one can indeed be expected due to the persistent soft-state nature of the system, and the lack of detection can reasonably be attributed to the system's low inclination. This disk wind is estimated to be 1000 km s −1 at a mass loss rate of 10 −11 M e yr −1 (Brandt & Schulz 2000;Castro Segura et al 2022;Fijma et al 2023). M dwarf wind characteristics vary significantly and are overall poorly constrained; we assume typical mass loss values of 10 −13 M e yr −1 and speeds <1000 km s −1 (Wood et al 2001(Wood et al , 2021.…”

Section: Shocks With the Companion Windmentioning

confidence: 99%

Variable Radio Emission of Neutron Star X-Ray Binary Ser X–1 during Its Persistent Soft State

Pattie,

Maccarone,

Tetarenko

et al. 2024

ApJ

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Ser X–1 is a low-mass neutron star X-ray binary and has been persistently accreting since its discovery in the 1960s. It has always been observed to be in a soft spectral state and has never showed substantial long-term X-ray variability. Ser X–1 has one previous radio observation in the literature in which radio emission was detected during this soft state, which is contrary to the behavior of black hole X-ray binaries. We have recently obtained 10 randomly sampled radio epochs of Ser X–1 in order to further investigate its anomalous soft-state radio emission. Out of 10 epochs, we find 8 nondetections and 2 detections at 10 GHz flux densities of 19.9 ± 4.2 μJy and 32.2 ± 3.6 μJy, respectively. We do not detect polarization in either epoch, ruling out very high polarization levels (≲63% and 34%). We compare these Ser X–1 results to other X-ray binaries and consider explanations for its long-term variable radio behavior.

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“…For example, the solid angle of the winds remains ill-constrained, but high detection rates in AGN imply that winds must have wide-angled geometries, with solid angles covering at least 30 % of all sight-lines, and more after accounting for observational biases [163,152]. In XRBs, there are important state dependences, with detections restricted (until recently) to equatorial sightlines in the soft state [161], though this paradigm may now be changing [164].…”

Section: Scale-invariancementioning

confidence: 99%

Frontiers in accretion physics at high X-ray spectral resolution

et al. 2022

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Microcalorimeters have demonstrated success in delivering high spectral resolution, and have paved the path to revolutionary new science possibilities in the coming decade of X-ray astronomy. There are several research areas in compact object science that can only be addressed with energy resolution Δ𝐸 ∼ < 5 eV at photon energies of a few keV, corresponding to velocity resolution of ∼ < a few hundred km s −1 , to be ushered in by microcalorimeters. Here, we review some of these outstanding questions, focusing on how the research landscape is set to be transformed (i) at the interface between accreting supermassive black holes and their host galaxies, (ii) in unravelling the structures of accretion environments, (iii) in resolving longstanding issues on the origins of energy and matter feedback, and (iv) to test mass-scaled unification of accretion and feedback. The need to learn lessons from Hitomi and to make improvements in laboratory atomic data precision as well as plasma modeling are highlighted.

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A persistent ultraviolet outflow from an accreting neutron star binary transient

Cited by 33 publications

References 37 publications

Unveiling optical signatures of outflows in accreting white dwarfs

Unveiling optical signatures of outflows in accreting white dwarfs

Variable Radio Emission of Neutron Star X-Ray Binary Ser X–1 during Its Persistent Soft State

Frontiers in accretion physics at high X-ray spectral resolution

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