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PSR J1840-1419: A very cool neutron star

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Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
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E. F. Keane (1), M. A. McLaughlin (2), M. Kramer (1, 3), B. W. Stappers (3), C. G. Bassa (3), M. B. Purver (3), P. Weltevrede (3) ((1) - Max Planck Institut fuer Radioastronomie
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Bonn, (2) - Dept. of Physics, University of West Virginia, (3) - Jodrell Bank Centre for Astrophysics, University of Manchester)

Solar and Stellar Astrophysics · Submitted 13 Jan 2013

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

The authors' main claim Our temperature upper limits for these stars are $kT_{\mathrm{bb}}^{\infty}<123^{+20}_{-33}$ eV and $kT_{\mathrm{bb}}^{\infty}<115^{+16}_{-33}$ eV, showing that these high magnetic field pulsars are not significantly hotter than those with lower magnetic fields.

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arXiv ID1301.2814 (version 1)
Pith IDDZSK6WYZ, Pith's permanent record of this paper and its review
Citation(2) - Dept. of Physics, 3), (3) - Jodrell Bank Centre for Astrophysics, Bonn, B. W. Stappers (3), C. G. Bassa (3), E. F. Keane (1), M. A. McLaughlin (2), M. B. Purver (3), M. Kramer (1, P. Weltevrede (3) ((1) - Max Planck Institut fuer Radioastronomie, University of Manchester), University of West Virginia. "PSR J1840-1419: A very cool neutron star." arXiv:1301.2814 (2013). https://pith.science/paper/DZSK6WYZ
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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, 4,629 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.52 · human participants 0.01 · controlled comparison 0.32 · randomized assignment 0.01 · states quantitative result 0.99 · compares with prior results 0.88 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

We present upper limits on the X-ray emission for three neutron stars. For PSR J1840$-$1419, with a characteristic age of 16.5 Myr, we calculate a blackbody temperature upper limit (at 99% confidence) of $kT_{\mathrm{bb}}^{\infty}<24^{+17}_{-10}$ eV, making this one of the coolest neutron stars known. PSRs J1814$-$1744 and J1847$-$0130 are both high magnetic field pulsars, with inferred surface dipole magnetic field strengths of $5.5\times10^{13}$ and $9.4\times10^{13}$ G, respectively. Our temperature upper limits for these stars are $kT_{\mathrm{bb}}^{\infty}<123^{+20}_{-33}$ eV and $kT_{\mathrm{bb}}^{\infty}<115^{+16}_{-33}$ eV, showing that these high magnetic field pulsars are not significantly hotter than those with lower magnetic fields. Finally, we put these limits into context by summarizing all temperature measurements and limits for rotation-driven neutron stars.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 We present upper limits on the X-ray emission for three neutron stars. contribution 0.98 0.93 0.08 asserted 0.98
s1 For PSR J1840$-$1419, with a characteristic age of 16.5 Myr, we calculate a blackbody temperature upper limit (at 99% confidence) of $kT_{\mathrm{bb}}^{\infty}<24^{+17}_{-10}$ eV, making this one of the coolest neutron stars known. result 1.00 0.94 0.61 asserted 0.98
s2 PSRs J1814$-$1744 and J1847$-$0130 are both high magnetic field pulsars, with inferred surface dipole magnetic field strengths of $5.5\times10^{13}$ and $9.4\times10^{13}$ G, respectively. result 0.68 0.56 0.06 asserted 0.98
s3 Our temperature upper limits for these stars are $kT_{\mathrm{bb}}^{\infty}<123^{+20}_{-33}$ eV and $kT_{\mathrm{bb}}^{\infty}<115^{+16}_{-33}$ eV, showing that these high magnetic field pulsars are not significantly hotter than those with lower magnetic fields. result 0.60 0.94 0.30 asserted 0.99
s4 Finally, we put these limits into context by summarizing all temperature measurements and limits for rotation-driven neutron stars. contribution 0.67 0.85 0.06 asserted 0.63

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.83.

What was examined, and what was not

sources read
  • arXiv listing abstract v1
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • 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 upper limits on the X-ray emission for three neutron stars. For PSR J1840$-$1419, with a characteristic age of 16.5 Myr, we calculate a blackbody temperature upper limit (at 99% confidence) of $kT_{\mathrm{bb}}^{\infty}<24^{+17}_{-10}$ eV, making this one of the coolest neutron stars known. PSRs J1814$-$1744 and J1847$-$0130 are both high magnetic field pulsars, with inferred surface dipole magnetic field strengths of $5.5\times10^{13}$ and $9.4\times10^{13}$ G, respectively. Our temperature upper limits for these stars are $kT_{\mathrm{bb}}^{\infty}<123^{+20}_{-33}$ eV and $kT_{\mathrm{bb}}^{\infty}<115^{+16}_{-33}$ eV, showing that these high magnetic field pulsars are not significantly hotter than those with lower magnetic fields. Finally, we put these limits into context by summarizing all temperature measurements and limits for rotation-driven neutron stars.

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