An Updated Mass–Radius Analysis of the 2017–2018 NICER Data Set of PSR J0030+0451
By Serena Vinciguerra, Tuomo Salmi, A. Watts, Devarshi Choudhury, T. E. Riley, P. Ray, S. Bogdanov, Yves Kini, S. Guillot, D. Chakrabarty and 4 more. Astrophysical Journal, 2023
159 citations recorded by the source corpus.
In 2019 the NICER collaboration published the first mass and radius inferred for PSR J0030+0451, thanks to NICER observations, and consequent constraints on the equation of state characterizing dense matter. Two independent analyses found a mass of ∼1.3–1.4 M ⊙ and a radius of ∼13 km. They also both found that the hot spots were all located on the same hemisphere, opposite to the observer, and that at least one of them had a significantly elongated shape. Here we reanalyze, in greater detail, the same NICER data set, incorporating the effects of an updated NICER response matrix and using an upgraded analysis framework. We expand the adopted models and also jointly analyze XMM-Newton data, which enables us to better constrain the fraction of observed counts coming from PSR J0030+0451. Adopting the same models used in previous publications, we find consistent results, although with more stringent inference requirements. We also find a multimodal structure in the posterior surface. This becomes crucial when XMM-Newton data is accounted for. Including the corresponding constraints disfavors the main solutions found previously, in favor of the new and more complex models. These have inferred masses and radii of ∼[1.4 M ⊙, 11.5 km] and ∼[1.7 M ⊙, 14.5 km], depending on the assumed model. They display configurations that do not require the two hot spots generating the observed X-rays to be on the same hemisphere, nor to show very elongated features, and point instead to the presence of temperature gradients and the need to account for them.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/0071a41a058220777883384606e226df17976c92
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In Astronomy and Astrophysics
Citations in the corpus
- Observation of Gravitational Waves from the Coalescence of a 2.5–4.5 M ⊙ Compact Object and a Neutron Star (2024, methodology): “…(Section 7), we repeat these analyses using GP-EoS constraints additionally conditioned on NICER observations (Legred et al. 2021, 2022) of J0030+0451 (Miller et al. 2019; Riley et al. 2019; Vinciguerra et al. 2024) and J0740+6620 (Miller et al. 2021; Riley et al. 2021; Salmi et al. 2022, 2023).”
- The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data (2024, background): “…have been released (Miller et al. 2019; Riley et al. 2019; Miller et al. 2021; Riley et al. 2021; Salmi et al. 2022, hereafter M21, R21, and S22; Vinciguerra et al. 2024), providing useful constraints for dense matter models (see, e.g., M21; Raaijmakers et al. 2021; Biswas 2022; Annala et al.…”