Advancing the Equation of state of Neutron Stars

Project Information

AEONS

Grant agreement ID: 865768

DOI

10.3030/865768

Project closed

EC signature date 2 March 2020

Start date 1 June 2020

End date 31 May 2025

Funded under

• EXCELLENT SCIENCE - European Research Council (ERC)

Total cost

€ 2 425 000,00

EU contribution

€ 2 425 000,00

Coordinated by

UNIVERSITEIT VAN AMSTERDAM
Netherlands

CORDIS provides links to public deliverables and publications of HORIZON projects.

Links to deliverables and publications from FP7 projects, as well as links to some specific result types such as dataset and software, are dynamically retrieved from OpenAIRE .

Deliverables

Open Research Data Pilot (1)

Data Management Plan

A research data management plan specifying the procedures to be followed to ensure open access to research data generated by this project.

Publications

Peer reviewed articles (36)

Individual neutrino masses from a supernova

Author(s): Peter B. Denton, Yves Kini
Published in: Physical Review D, Issue 111, 2025, Page(s) 103006, ISSN 2470-0010
Publisher: American Physical Society (APS)
DOI: 10.1103/physrevd.111.103006

Dense matter in neutron stars with eXTP

Author(s): Ang Li, Anna L. Watts, Guobao Zhang, Sebastien Guillot, Yanjun Xu, Andrea Santangelo, Silvia Zane, Hua Feng, Shuang-Nan Zhang, Mingyu Ge, Liqiang Qi, Tuomo Salmi, Bas Dorsman, Zhiqiang Miao, Zhonghao Tu, Yuri Cavecchi, Xia Zhou, Xiaoping Zheng, Weihua Wang, Quan Cheng, Xuezhi Liu, Yining Wei, Wei Wang, Yujing Xu, Shanshan Weng, Weiwei Zhu, Zhaosheng Li, Lijing Shao, Youli Tuo, Akira Dohi, Ming Lyu
Published in: Science China Physics, Mechanics & Astronomy, Issue 68, 2025, Page(s) 119503, ISSN 1674-7348
Publisher: Zhongguo Kexue Zazhishe/Science in China Press
DOI: 10.1007/s11433-025-2761-4

Polarized radiation from an accretion shock in accreting millisecond pulsars using exact Compton scattering formalism

Author(s): Anna Bobrikova; Vladislav Loktev; Tuomo Salmi; Juri Poutanen
Published in: Astronomy & Astrophysics, Issue 678, 2023, Page(s) A99, ISSN 1432-0746
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202346833

NEoST: A Python package for nested sampling of the neutron star equation of state

Author(s): Geert Raaijmakers, Nathan Rutherford, Patrick Timmerman, Tuomo Salmi, Anna L. Watts, Chanda Prescod-Weinstein, Isak Svensson, Melissa Mendes
Published in: Journal of Open Source Software, Issue 10, 2025, Page(s) 6003, ISSN 2475-9066
Publisher: The Open Journal
DOI: 10.21105/joss.06003

Constraining bosonic asymmetric dark matter with neutron star mass-radius measurements

Author(s): Nathan Rutherford, Geert Raaijmakers, Chanda Prescod-Weinstein, Anna Watts
Published in: Physical Review D, Issue 107, 2023, Page(s) 103051, ISSN 2470-0029
Publisher: American Physical Society
DOI: 10.1103/physrevd.107.103051

Exploring Waveform Variations among Neutron Star Ray-tracing Codes for Complex Emission Geometries

Author(s): Devarshi Choudhury, Anna L. Watts, Alexander J. Dittmann, M. Coleman Miller, Sharon M. Morsink, Tuomo Salmi, Serena Vinciguerra, Slavko Bogdanov, Sebastien Guillot, Michael T. Wolff, Zaven Arzoumanian
Published in: The Astrophysical Journal, Issue 975, 2024, Page(s) 202, ISSN 1538-4357
Publisher: IOP Publishing
DOI: 10.3847/1538-4357/ad7255

Constraining the Dense Matter Equation of State with New NICER Mass–Radius Measurements and New Chiral Effective Field Theory Inputs

Author(s): Nathan Rutherford, Melissa Mendes, Isak Svensson, Achim Schwenk, Anna L. Watts, Kai Hebeler, Jonas Keller, Chanda Prescod-Weinstein, Devarshi Choudhury, Geert Raaijmakers, Tuomo Salmi, Patrick Timmerman, Serena Vinciguerra, Sebastien Guillot, James M. Lattimer
Published in: The Astrophysical Journal Letters, Issue 971, 2024, Page(s) L19, ISSN 2041-8205
Publisher: Institute of Physics Publishing
DOI: 10.3847/2041-8213/ad5f02

Pulse Profiles of Accreting Neutron Stars from GRMHD Simulations

Author(s): Pushpita Das, Tuomo Salmi, Jordy Davelaar, Oliver Porth, Anna Watts
Published in: The Astrophysical Journal, Issue 987, 2025, Page(s) 34, ISSN 0004-637X
Publisher: University of Chicago Press
DOI: 10.3847/1538-4357/add472

Pulse profile modelling of thermonuclear burst oscillations - I. The effect of neglecting variability

Author(s): Yves Kini, Tuomo Salmi, Anna L. Watts, Serena Vinciguerra, Devarshi Choudhury, Siem Fenne, Slavko Bogdanov, Zach Meisel, Valery Suleimanov
Published in: Monthly Notices of the Royal Astronomical Society, Issue 522, 2023, Page(s) 3389–3404, ISSN 1365-2966
Publisher: Oxford University Press
DOI: 10.1093/mnras/stad1030

Constraining the properties of the thermonuclear burst oscillation source XTE J1814−338 through pulse profile modelling

Author(s): Yves Kini, Tuomo Salmi, Serena Vinciguerra, Anna L Watts, Anna Bilous, Duncan K Galloway, Emma van der Wateren, Guru Partap Khalsa, Slavko Bogdanov, Johannes Buchner, Valery Suleimanov
Published in: Monthly Notices of the Royal Astronomical Society, Issue 535, 2024, Page(s) 1507-1525, ISSN 0035-8711
Publisher: Blackwell Publishing Inc.
DOI: 10.1093/mnras/stae2398

Atmospheric Effects on Neutron Star Parameter Constraints with NICER

Author(s): Tuomo Salmi, Serena Vinciguerra, Devarshi Choudhury, Anna L. Watts, Wynn C. G. Ho, Sebastien Guillot, Yves Kini, Bas Dorsman, Sharon M. Morsink, Slavko Bogdanov
Published in: The Astrophysical Journal, Issue 956, 2023, Page(s) 138, ISSN 1538-4357
Publisher: IOP Publishing
DOI: 10.3847/1538-4357/acf49d

"Cross-comparison of sampling algorithms for pulse profile modeling of PSR <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML"" display=""inline""><mml:mrow><mml:mi mathvariant=""normal"">J</mml:mi><mml:mn>0740</mml:mn><mml:mo>+</mml:mo><mml:mn>6620</mml:mn></mml:mrow></mml:math>"

Author(s): Mariska Hoogkamer, Yves Kini, Tuomo Salmi, Anna L. Watts, Johannes Buchner
Published in: Physical Review D, Issue 112, 2025, ISSN 2470-0010
Publisher: American Physical Society (APS)
DOI: 10.1103/cp8c-2nbk

A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy

Author(s): Thomas E. Riley, Anna L. Watts, Paul S. Ray, Slavko Bogdanov, Sebastien Guillot, Sharon M. Morsink, Anna V. Bilous, Zaven Arzoumanian, Devarshi Choudhury, Julia S. Deneva, Keith C. Gendreau, Alice K. Harding, Wynn C. G. Ho, James M. Lattimer, Michael Loewenstein, Renee M. Ludlam, Craig B. Markwardt, Takashi Okajima, Chanda Prescod-Weinstein, Ronald A. Remillard, Michael T. Wolff, Emmanuel Fonseca,
Published in: The Astrophysical Journal Letters, Issue 918/2, 2021, Page(s) L27, ISSN 2041-8205
Publisher: Institute of Physics Publishing
DOI: 10.3847/2041-8213/ac0a81

Pulse Profile Modelling of Thermonuclear Burst Oscillations II: Handling variability

Author(s): Yves Kini, Tuomo Salmi, Serena Vinciguerra, Anna L. Watts, Devarshi Choudhury, Slavko Bogdanov, Johannes Buchner, Zach Meisel, Valery Suleimanov
Published in: Monthly Notices of the Royal Astronomical Society, Issue 527, 2024, Page(s) 8118-8130, ISSN 1365-2966
Publisher: Oxford University Press
DOI: 10.1093/mnras/stad3595

Search for Continuous Gravitational Waves from Scorpius X-1 in LIGO O2 Data

Author(s): Zhang, Yuanhao; Papa, Maria Alessandra; Krishnan, Badri; Watts, Anna L.
Published in: The Astrophysical Journal Letters, Issue 1, 2021, Page(s) L14-, ISSN 2041-8205
Publisher: Institute of Physics Publishing
DOI: 10.3847/2041-8213/abd256

Spectroscopic Time-Resolving Observatory for Broadband Energy X-rays: mission overview

Author(s): Paul S. Ray, Peter W. A. Roming, Andrea Argan, Zaven Arzoumanian, David R. Ballantyne, Slavko Bogdanov, Valter Bonvicini, Terri J. Brandt, Michal Bursa, Edward M. Cackett, Deepto Chakrabarty, Marc Christophersen, Kathleen M. Coderre, Gianluigi De Geronimo, Ettore Del Monte, Alessandra DeRosa, Harley R. Dietz, Yuri Evangelista, Marco Feroci, Jeremy J. Ford, Cynthia Froning, Christopher L. Fryer, Ke
Published in: Journal of Astronomical Telescopes, Instruments, and Systems, Issue 10, 2024, Page(s) ., ISSN 2329-4124
Publisher: SPIE
DOI: 10.1117/1.jatis.10.4.042504

X-PSI: A Python package for neutron star X-ray pulsesimulation and inference

Author(s): Thomas E. Riley, Devarshi Choudhury, Tuomo Salmi, Serena Vinciguerra, Yves Kini, Bas Dorsman, Anna L. Watts, Daniela Huppenkothen, Sebastien Guillot
Published in: Journal of Open Source Software, Issue 8(82), 2023, Page(s) 4977, ISSN 2475-9066
Publisher: The Open Journal
DOI: 10.21105/joss.04977

Effects of scattering in the accretion funnel on the pulse profiles of accreting millisecond pulsars

Author(s): Varpu Ahlberg; Juri Poutanen; Tuomo Salmi
Published in: Astronomy & Astrophysics, Issue 682, 2024, Page(s) A60, ISSN 1432-0746
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202348153

GRMHD simulations of accreting neutron stars with non-dipole fields

Author(s): Pushpita Das, Oliver Porth, Anna L. Watts
Published in: Monthly Notices of the Royal Astronomical Society, Issue 515/3, 2022, Page(s) 3144–3161, ISSN 1745-3933
Publisher: Blackwell Publishing
DOI: 10.1093/mnras/stac1817

The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data

Author(s): Tuomo Salmi, Devarshi Choudhury, Yves Kini, Thomas E. Riley, Serena Vinciguerra, Anna L. Watts, Michael T. Wolff, Zaven Arzoumanian, Slavko Bogdanov, Deepto Chakrabarty, Keith Gendreau, Sebastien Guillot, Wynn C. G. Ho, Daniela Huppenkothen, Renee M. Ludlam, Sharon M. Morsink, Paul S. Ray
Published in: The Astrophysical Journal, Issue 974, 2024, Page(s) 294, ISSN 0004-637X
Publisher: University of Chicago Press
DOI: 10.3847/1538-4357/ad5f1f

Scaling relations for the uncertainty in neutron star radius inferred from pulse profile modelling: the effect of spin rate

Author(s): Erik Bootsma, Serena Vinciguerra, Anna L Watts, Yves Kini, Tuomo Salmi
Published in: Monthly Notices of the Royal Astronomical Society, Issue 537, 2025, Page(s) 3769-3780, ISSN 0035-8711
Publisher: Blackwell Publishing Inc.
DOI: 10.1093/mnras/staf259

Prospects of Gravitational-wave Follow-up through a Wide-field Ultraviolet Satellite: A Dorado Case Study

Author(s): Bas Dorsman, Geert Raaijmakers, S. Bradley Cenko, Samaya Nissanke, Leo P. Singer, Mansi M. Kasliwal, Anthony L. Piro, Eric C. Bellm, Dieter H. Hartmann, Kenta Hotokezaka, and Kamilė Lukošiūtė
Published in: The Astrophysical Journal, Issue 944, 2023, Page(s) 126, ISSN 0004-637X
Publisher: University of Chicago Press
DOI: 10.3847/1538-4357/acaa9e

Constraining the Neutron Star Mass–Radius Relation and Dense Matter Equation of State with NICER. III. Model Description and Verification of Parameter Estimation Codes

Author(s): Slavko Bogdanov, Alexander J. Dittmann, Wynn C. G. Ho, Frederick K. Lamb, Simin Mahmoodifar, M. Coleman Miller, Sharon M. Morsink, Thomas E. Riley, Tod E. Strohmayer, Anna L. Watts, Devarshi Choudhury, Sebastien Guillot, Alice K. Harding, Paul S. Ray, Zorawar Wadiasingh, Michael T. Wolff, Craig B. Markwardt, Zaven Arzoumanian, Keith C. Gendreau
Published in: The Astrophysical Journal Letters, Issue 914/1, 2021, Page(s) L15, ISSN 2041-8205
Publisher: Institute of Physics Publishing
DOI: 10.3847/2041-8213/abfb79

The Radius of PSR J0740+6620 from NICER with NICER background estimates

Author(s): Tuomo Salmi, Serena Vinciguerra, Devarshi Choudhury, Thomas E. Riley, Anna L. Watts, Ronald A. Remillard, Paul S. Ray, Slavko Bogdanov, Sebastien Guillot, Zaven Arzoumanian, Cecilia Chirenti, Alexander J. Dittmann, Keith C. Gendreau, Wynn C. G. Ho, M. Coleman Miller, Sharon M. Morsink, Zorawar Wadiasingh, Michael T. Wolff
Published in: The Astrophysical Journal, Issue 941, 2022, Page(s) 150, ISSN 1538-4357
Publisher: Institute of Physics Publishing
DOI: 10.3847/1538-4357/ac983d

Parameter constraints for accreting millisecond pulsars with synthetic NICER data

Author(s): Bas Dorsman, Tuomo Salmi, Anna L Watts, Mason Ng, Satish Kamath, Anna Bobrikova, Juri Poutanen, Vladislav Loktev, Yves Kini, Devarshi Choudhury, Serena Vinciguerra, Slavko Bogdanov, Deepto Chakrabarty
Published in: Monthly Notices of the Royal Astronomical Society, Issue 538, 2025, Page(s) 2853-2868, ISSN 0035-8711
Publisher: Blackwell Publishing Inc.
DOI: 10.1093/mnras/staf438

Constraints on the Dense Matter Equation of State and Neutron Star Properties from NICER’s Mass–Radius Estimate of PSR J0740+6620 and Multimessenger Observations

Author(s): G. Raaijmakers, S. K. Greif, K. Hebeler, T. Hinderer, S. Nissanke, A. Schwenk, T. E. Riley, A. L. Watts, J. M. Lattimer, W. C. G. Ho
Published in: The Astrophysical Journal Letters, Issue 918/2, 2021, Page(s) L29, ISSN 2041-8205
Publisher: Institute of Physics Publishing
DOI: 10.3847/2041-8213/ac089a

A NICER View of the Nearest and Brightest Millisecond Pulsar: PSR J0437–4715

Author(s): Devarshi Choudhury, Tuomo Salmi, Serena Vinciguerra, Thomas E. Riley, Yves Kini, Anna L. Watts, Bas Dorsman, Slavko Bogdanov, Sebastien Guillot, Paul S. Ray, Daniel J. Reardon, Ronald A. Remillard, Anna V. Bilous, Daniela Huppenkothen, James M. Lattimer, Nathan Rutherford, Zaven Arzoumanian, Keith C. Gendreau, Sharon M. Morsink, Wynn C. G. Ho
Published in: The Astrophysical Journal Letters, Issue 971, 2024, Page(s) L20, ISSN 2041-8205
Publisher: Institute of Physics Publishing
DOI: 10.3847/2041-8213/ad5a6f

An updated mass-radius analysis of the 2017-2018 NICER data set of PSR J0030+0451

Author(s): Vinciguerra, Serena; Salmi, Tuomo; Watts, Anna L.; Choudhury, Devarshi; Riley, Thomas E.; Ray, Paul S.; Bogdanov, Slavko; Kini, Yves; Guillot, Sebastien; Chakrabarty, Deepto; Ho, Wynn C. G.; Huppenkothen, Daniela; Morsink, Sharon M.; Wadiasingh, Zorawar
Published in: The Astrophysical Journal, Issue 961, 2024, Page(s) 62, ISSN 1538-4357
Publisher: IOP Publishing
DOI: 10.3847/1538-4357/acfb83

Constraining a relativistic mean field model using neutron star mass-radius measurements I: Nucleonic models

Author(s): Chun Huang, Geert Raaijmakers, Anna L. Watts, Laura Tolos, Constança Providência
Published in: Monthly Notices of the Royal Astronomical Society, Issue 529, 2024, Page(s) 4650–4665, ISSN 1365-2966
Publisher: Oxford University Press
DOI: 10.1093/mnras/stae844

A NICER View of PSR J1231−1411: A Complex Case

Author(s): Tuomo Salmi, Julia S. Deneva, Paul S. Ray, Anna L. Watts, Devarshi Choudhury, Yves Kini, Serena Vinciguerra, H. Thankful Cromartie, Michael T. Wolff, Zaven Arzoumanian, Slavko Bogdanov, Keith Gendreau, Sebastien Guillot, Wynn C. G. Ho, Sharon M. Morsink, Ismaël Cognard, Lucas Guillemot, Gilles Theureau, and Matthew Kerr
Published in: Astrophysical Journal, Issue 976, 2024, Page(s) 58, ISSN 1538-4357
Publisher: Institute of Physics Publishing
DOI: 10.3847/1538-4357/ad81d2

Constraining a relativistic mean field model using neutron star mass–radius measurements II: hyperonic models

Author(s): Chun Huang, Laura Tolos, Constança Providência, Anna Watts
Published in: Monthly Notices of the Royal Astronomical Society, Issue 536, 2025, Page(s) 3262-3275, ISSN 0035-8711
Publisher: Blackwell Publishing Inc.
DOI: 10.1093/mnras/stae2792

Impact of accretion assumptions on pulse profile modelling of superburst oscillations in 4U 1636−536

Author(s): Yves Kini, Anna L Watts, Tuomo Salmi, Anna Bilous, Serena Vinciguerra, Sebastien Guillot, David R Ballantyne, Erik Kuulkers, Slavko Bogdanov, Valery Suleimanov
Published in: Monthly Notices of the Royal Astronomical Society, Issue 541, 2025, Page(s) 46-57, ISSN 0035-8711
Publisher: Blackwell Publishing Inc.
DOI: 10.1093/mnras/staf908

Probing fermionic asymmetric dark matter cores using global neutron star properties

Author(s): Nathan Rutherford, Chanda Prescod-Weinstein, Anna Watts
Published in: Physical Review D, Issue 111, 2025, Page(s) 123034, ISSN 2470-0010
Publisher: American Physical Society (APS)
DOI: 10.1103/physrevd.111.123034

Horizons: nuclear astrophysics in the 2020s and beyond

Author(s): H.Schatz et al.
Published in: Journal of Physics G: Nuclear and Particle Physics, Issue 49, 2022, Page(s) 110502, ISSN 0954-3899
Publisher: Institute of Physics Publishing
DOI: 10.1088/1361-6471/ac8890

Modelling polarized X-ray pulses from accreting millisecond pulsars with X-PSI, using different hot spot locations and shapes

Author(s): Tuomo Salmi, Bas Dorsman, Anna L Watts, Anna Bobrikova, Alessandro Di Marco, Vladislav Loktev, Alessandro Papitto, Maura Pilia, Juri Poutanen, John Rankin
Published in: Monthly Notices of the Royal Astronomical Society, Issue 538, 2025, Page(s) 2562-2568, ISSN 0035-8711
Publisher: Blackwell Publishing Inc.
DOI: 10.1093/mnras/staf441

X-PSI Parameter Recovery for Temperature Map Configurations Inspired by PSR J0030+0451

Author(s): Serena Vinciguerra, Tuomo Salmi, Anna L. Watts, Devarshi Choudhury, Yves Kini, Thomas E. Riley
Published in: The Astrophysical Journal, Issue 959, 2023, Page(s) 55, ISSN 1538-4357
Publisher: Institute of Physics Publishing
DOI: 10.3847/1538-4357/acf9a0

Book chapters (1)

Measuring Neutron Star Mass and Radius Using Pulse Profile Modelling - NICER and Beyond

Author(s): Anna L. Watts
Published in: Nuclear Theory in the Age of Multimessenger Astronomy, 2024, ISBN 9781032307756
Publisher: CRC Press (Taylor & Francis group)

Conference proceedings (1)

Constraining neutron star properties with NICER: current results and future prospects for Athena

Author(s): Anna Watts
Published in: Issue 1, 2022
Publisher: Zenodo
DOI: 10.5281/zenodo.7350321