1 Hz flaring in SAX J1808.4--3658: flow instabilities near the propeller stage

A.L. Watts; A. Patruno; M. Klein-Wolt; M. van der Klis (API; R. Wijnands; Univ. Amsterdam)

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1 Hz flaring in SAX J1808.4--3658: flow instabilities near the propeller stage

A. Patruno, A.L. Watts, M. Klein-Wolt, R. Wijnands, M. van der Klis (API, Univ. Amsterdam)

High Energy Astrophysical Phenomena · Submitted 3 Apr 2009

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We show that links between pulsations and 1 Hz flares might exist, and suggest they are related with hydrodynamic disk instabilities that are triggered close to the disk-magnetosphere boundary layer when the system is entering the propeller regime.

how it is stated · hedged possibility 0.76 read the record →

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arXiv ID0904.0560 (version 2)

Pith ID4J24STT6, Pith's permanent record of this paper and its review

CitationA.L. Watts, A. Patruno, M. Klein-Wolt, M. van der Klis (API, R. Wijnands, Univ. Amsterdam). "1 Hz flaring in SAX J1808.4--3658: flow instabilities near the propeller stage." arXiv:0904.0560 (2009). https://pith.science/paper/4J24STT6

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The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,079 input tokens, $0.0001 reported.

What the abstract itself states, as probabilities: claims first 0.90 · states limitation 0.16 · human participants 0.01 · controlled comparison 0.03 · randomized assignment 0.01 · states quantitative result 0.32 · compares with prior results 0.12 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; show every role.

We present a simultaneous periodic and aperiodic timing study of the accreting millisecond X-ray pulsar SAX J1808.4-3658. We analyze five outbursts of the source and for the first time provide a full and systematic investigation of the enigmatic phenomenon of the 1 Hz flares observed during the final stages of some of the outbursts. We show that links between pulsations and 1 Hz flares might exist, and suggest they are related with hydrodynamic disk instabilities that are triggered close to the disk-magnetosphere boundary layer when the system is entering the propeller regime.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We present a simultaneous periodic and aperiodic timing study of the accreting millisecond X-ray pulsar SAX J1808.4-3658.	contribution 0.99	0.94	0.03	asserted 0.89
s1	We analyze five outbursts of the source and for the first time provide a full and systematic investigation of the enigmatic phenomenon of the 1 Hz flares observed during the final stages of some of the outbursts.	contribution 0.98	0.96	0.07	asserted 1.00
s2	We show that links between pulsations and 1 Hz flares might exist, and suggest they are related with hydrodynamic disk instabilities that are triggered close to the disk-magnetosphere boundary layer when the system is entering the propeller regime.	interpretation 0.97	0.86	0.88	hedged possibility 0.76

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from analysis of existing data 0.65.

What was examined, and what was not

sources read

arXiv listing abstract v2

not examined

full text
figures and tables
references and citing sentences
relations to other papers

levels run

P abstract

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S sections
T body sentences
C citations
R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper

Original abstract

We present a simultaneous periodic and aperiodic timing study of the accreting millisecond X-ray pulsar SAX J1808.4-3658. We analyze five outbursts of the source and for the first time provide a full and systematic investigation of the enigmatic phenomenon of the 1 Hz flares observed during the final stages of some of the outbursts. We show that links between pulsations and 1 Hz flares might exist, and suggest they are related with hydrodynamic disk instabilities that are triggered close to the disk-magnetosphere boundary layer when the system is entering the propeller regime.

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References

How the literature uses it

3 arXiv papers cite this in 3 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

What it cites · 1 sentence without a confident label

Cites as background 1 paper

The conditions necessary for the onset of Kruskal-Schwarzschild instabilities in the situation where $r_m r_c$ have since been studied using MHD simulations [ref] .

Accretion to Magnetized Stars through the Rayleigh-Taylor Instability: Global Three-Dimensional Simulations · Interchange instabilities · 0.86

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