???global.info.a_carregar???
Tjarda Coenraad Nico Boekholt. Completed the Doktor (PhD) in Astronomy in 2015/11/10 by Universiteit Leiden Faculteit der Wiskunde en Natuurwetenschappen and Master in Astronomy in 2011/09/01 by Universiteit Leiden Faculteit der Wiskunde en Natuurwetenschappen. Published 29 articles in journals. Organized 3 event(s). Co-supervised 2 PhD thesis(es). Supervised 2 MSc dissertation(s) e co-supervised 5. Has received 7 awards and/or honors. Participates and/or participated as PhD Student Fellow in 1 project(s) and Post-doc Fellow in 1 project(s). Works in the area(s) of Exact Sciences with emphasis on Physical Sciences with emphasis on Astronomy.
Read full resume ↓
Identification

Personal identification

Full name
Tjarda Coenraad Nico Boekholt

Citation names

  • Boekholt, Tjarda
  • Boekholt, T. C. N.

Author identifiers

Ciência ID
DE1A-11C9-E912

Addresses

  • Moffett Field, 94035, Mountain View, California, United States (Professional)

Websites

Knowledge fields

  • Exact Sciences - Physical Sciences - Astronomy

Languages

Language Speaking Reading Writing Listening Peer-review
Dutch (Mother tongue)
English Proficiency (C2) Proficiency (C2) Proficiency (C2) Proficiency (C2) Proficiency (C2)
Portuguese Beginner (A1) Beginner (A1) Beginner (A1) Beginner (A1) Beginner (A1)
Education
Degree Classification
2011/10/01 - 2015/11/10
Concluded
 Astronomy (Doktor (PhD))
Major in Computational Astrophysics
Universiteit Leiden Faculteit der Wiskunde en Natuurwetenschappen, Netherlands
"Chaotic Dynamics in N-body Systems" (THESIS/DISSERTATION)
2009/09/01 - 2011/09/01
Concluded
 Astronomy (Master)
Major in Computational Astrophysics
Universiteit Leiden Faculteit der Wiskunde en Natuurwetenschappen, Netherlands
"Arbitrary-precision N-body Code" (THESIS/DISSERTATION)
Affiliation

Science

Category
Host institution 		Employer
2024/01/18 - 2026/01/17 Auxiliary Researcher (Research) Oak Ridge Associated Universities, United States
NASA Ames Research Center, United States
2020/09/01 - 2023/09/30 Postdoc (Research) University of Oxford Department of Physics, United Kingdom
University of Oxford Rudolf Peierls Centre for Theoretical Physics, United Kingdom
2020/01/01 - 2020/08/31 Postdoc (Research) Universidade de Coimbra, Portugal
Universidade de Coimbra Centro de Física, Portugal
2019/07/01 - 2019/12/31 Postdoc (Research) Instituto de Telecomunicações Campus Universitário de Santiago, Portugal
Instituto de Telecomunicações Campus Universitário de Santiago, Portugal
2017/07/01 - 2019/06/30 Researcher (Research) Universidade de Aveiro, Portugal
Universidade de Aveiro Centro de Investigação e Desenvolvimento em Matemática e Aplicações, Portugal
2016/11/15 - 2017/04/15 Postdoc (Research) Universidad de Concepción, Chile
Universidad de Concepción, Chile
Projects

Contract

Designation Funders
2017/07/01 - 2020/08/30 ENGAGE-SKA
POCI-01-0145-FEDER- 022217
POCI-01-0145-FEDER-029932
Post-doc Fellow
Instituto de Telecomunicações Campus Universitário de Santiago, Portugal

Universidade de Coimbra, Portugal
Ongoing
2011/10/01 - 2015/11/10 AMUSE: Astrophysical Multi-purpose Software Environment
643.200.503
639.073.803
614.061.608
PhD Student Fellow
Universiteit Leiden Faculteit der Wiskunde en Natuurwetenschappen, Netherlands
Concluded
Outputs

Publications

Conference paper
  1. Zwart, Simon Portegies; Boekholt, Tjarda. "The paradox of infinitesimal granularity: Chaos and the reversibility of time in Newton’s theory of gravity". 2023.
    10.1063/5.0163734
Journal article
  1. Rowan, Connar; Whitehead, Henry; Boekholt, Tjarda; Kocsis, Bence; Haiman, Zoltán. "Black hole binaries in AGN accretion discs – II. Gas effects on black hole satellite scatterings". Monthly Notices of the Royal Astronomical Society 527 4 (2023): 10448-10468. http://dx.doi.org/10.1093/mnras/stad3641.
    10.1093/mnras/stad3641
  2. Portegies Zwart, Simon F; Boekholt, Tjarda C N; Heggie, Douglas C. "Punctuated chaos and the unpredictability of the Galactic Centre S-star orbital evolution". Monthly Notices of the Royal Astronomical Society 526 4 (2023): 5791-5799. http://dx.doi.org/10.1093/mnras/stad2654.
    10.1093/mnras/stad2654
  3. Boekholt, Tjarda C. N.; Portegies Zwart, Simon F.; Heggie, Douglas C.. "Punctuated chaos and indeterminism in self-gravitating many-body systems". International Journal of Modern Physics D 32 14 (2023): http://dx.doi.org/10.1142/s0218271823420038.
    10.1142/s0218271823420038
  4. Rowan, Connar; Boekholt, Tjarda; Kocsis, Bence; Haiman, Zoltán. "Black hole binary formation in AGN discs: from isolation to merger". Monthly Notices of the Royal Astronomical Society 524 2 (2023): 2770-2796. http://dx.doi.org/10.1093/mnras/stad1926.
    10.1093/mnras/stad1926
  5. Carrillo, D R Matus; Fellhauer, M; Boekholt, T C N; Stutz, A; Inostroza, M C B Morales. "Stirred, not shaken: Star cluster survival in the slingshot scenario". Monthly Notices of the Royal Astronomical Society (2023): http://dx.doi.org/10.1093/mnras/stad1256.
    Published • 10.1093/mnras/stad1256
  6. Boekholt, Tjarda C N; Correia, Alexandre C M. "A direct N-body integrator for modelling the chaotic, tidal dynamics of multibody extrasolar systems: TIDYMESS". Monthly Notices of the Royal Astronomical Society 522 2 (2023): 2885-2900. http://dx.doi.org/10.1093/mnras/stad1133.
    Published • 10.1093/mnras/stad1133
  7. Boekholt, Tjarda C N; Vaillant, Timothée; Correia, Alexandre C M. "Reversible time-step adaptation for the integration of few-body systems". Monthly Notices of the Royal Astronomical Society 519 3 (2022): 3281-3291. http://dx.doi.org/10.1093/mnras/stac3777.
    Published • 10.1093/mnras/stac3777
  8. Boekholt, Tjarda C N; Rowan, Connar; Kocsis, Bence. "On the Jacobi capture origin of binaries with applications to the Earth-Moon system and black holes in galactic nuclei". Monthly Notices of the Royal Astronomical Society 518 4 (2022): 5653-5669. http://dx.doi.org/10.1093/mnras/stac3495.
    Published • 10.1093/mnras/stac3495
  9. Knigge, C; Toonen, S; Boekholt, T C N. "A triple star origin for T Pyx and other short-period recurrent novae". Monthly Notices of the Royal Astronomical Society 514 2 (2022): 1895-1907. http://dx.doi.org/10.1093/mnras/stac1336.
    10.1093/mnras/stac1336
  10. Toonen, S.; Boekholt, T. C. N.; Portegies Zwart, S.. "Stellar triples on the edge". Astronomy & Astrophysics 661 (2022): A61. http://dx.doi.org/10.1051/0004-6361/202141991.
    10.1051/0004-6361/202141991
  11. Portegies Zwart, S. F.; Boekholt, T. C. N.; Por, E. H.; Hamers, A. S.; McMillan, S. L. W.. "Chaos in self-gravitating many-body systems". Astronomy & Astrophysics 659 (2022): A86. http://dx.doi.org/10.1051/0004-6361/202141789.
    10.1051/0004-6361/202141789
  12. Boekholt, Tjarda C.¿N.; Moerman, Arend; Portegies Zwart, Simon F.. "Relativistic Pythagorean three-body problem". Physical Review D 104 8 (2021): http://dx.doi.org/10.1103/physrevd.104.083020.
    10.1103/physrevd.104.083020
  13. Barbosa, Domingos; Coelho, Bruno; Antón, Sonia; Bergano, Miguel; Boekholt, Tjarda; Correia, Alexandre C.M.; Maia, Dalmiro; et al. "Radio astronomy and Space science in Azores: Enhancing the Atlantic VLBI infrastructure cluster". Advances in Space Research 68 7 (2021): 3064-3078. http://dx.doi.org/10.1016/j.asr.2021.05.023.
    10.1016/j.asr.2021.05.023
  14. Das, Arpan; Schleicher, Dominik R G; Basu, Shantanu; Boekholt, Tjarda C N. "Effect of mass-loss due to stellar winds on the formation of supermassive black hole seeds in dense nuclear star clusters". Monthly Notices of the Royal Astronomical Society 505 2 (2021): 2186-2194. http://dx.doi.org/10.1093/mnras/stab1428.
    10.1093/mnras/stab1428
  15. Vergara, M. Z. C.; Schleicher, D. R. G.; Boekholt, T. C. N.; Reinoso, B.; Fellhauer, M.; Klessen, R. S.; Leigh, N. W. C.. "Stellar collisions in flattened and rotating Population III star clusters". Astronomy & Astrophysics 649 (2021): A160. http://dx.doi.org/10.1051/0004-6361/202140298.
    10.1051/0004-6361/202140298
  16. Das, Arpan; Schleicher, Dominik R G; Leigh, Nathan W C; Boekholt, Tjarda C N. "Formation of supermassive black hole seeds in nuclear star clusters via gas accretion and runaway collisions". Monthly Notices of the Royal Astronomical Society (2021): http://dx.doi.org/10.1093/mnras/stab402.
    10.1093/mnras/stab402
  17. Breen, Philip G; Foley, Christopher N; Boekholt, Tjarda; Zwart, Simon Portegies. "Newton versus the machine: solving the chaotic three-body problem using deep neural networks". Monthly Notices of the Royal Astronomical Society 494 2 (2020): 2465-2470. http://dx.doi.org/10.1093/mnras/staa713.
    10.1093/mnras/staa713
  18. Alister Seguel, P J; Schleicher, D R G; Boekholt, T C N; Fellhauer, M; Klessen, R S. "Formation of SMBH seeds in Population III star clusters through collisions: the importance of mass loss". Monthly Notices of the Royal Astronomical Society 493 2 (2020): 2352-2362. http://dx.doi.org/10.1093/mnras/staa456.
    10.1093/mnras/staa456
  19. Boekholt, T C N; Portegies Zwart, S F; Valtonen, M. "Gargantuan chaotic gravitational three-body systems and their irreversibility to the Planck length". Monthly Notices of the Royal Astronomical Society 493 3 (2020): 3932-3937. http://dx.doi.org/10.1093/mnras/staa452.
    Published • 10.1093/mnras/staa452
  20. Portegies Zwart, Simon F.; Boekholt, Tjarda C.N.. "Numerical verification of the microscopic time reversibility of Newton’s equations of motion: Fighting exponential divergence". Communications in Nonlinear Science and Numerical Simulation 61 (2018): 160-166. http://dx.doi.org/10.1016/j.cnsns.2018.02.002.
    10.1016/j.cnsns.2018.02.002
  21. Reinoso, B.; Schleicher, D. R. G.; Fellhauer, M.; Klessen, R. S.; Boekholt, T. C. N.. "Collisions in primordial star clusters". Astronomy & Astrophysics 614 (2018): A14. http://dx.doi.org/10.1051/0004-6361/201732224.
    10.1051/0004-6361/201732224
  22. Boekholt, T C N; Schleicher, D R G; Fellhauer, M; Klessen, R S; Reinoso, B; Stutz, A M; Haemmerlé, L. "Formation of massive seed black holes via collisions and accretion". Monthly Notices of the Royal Astronomical Society 476 1 (2018): 366-380. http://dx.doi.org/10.1093/mnras/sty208.
    10.1093/mnras/sty208
  23. Boekholt, T. C. N.; Stutz, A. M.; Fellhauer, M.; Schleicher, D. R. G.; Matus Carrillo, D. R.. "Dynamical ejections of stars due to an accelerating gas filament". Monthly Notices of the Royal Astronomical Society 471 3 (2017): 3590-3598. http://dx.doi.org/10.1093/mnras/stx1821.
    10.1093/mnras/stx1821
  24. Toonen, S.; Hollands, M.; Gänsicke, B. T.; Boekholt, T.. "The binarity of the local white dwarf population". Astronomy & Astrophysics 602 (2017): A16. http://dx.doi.org/10.1051/0004-6361/201629978.
    10.1051/0004-6361/201629978
  25. Boekholt, T. C. N.; Pelupessy, F. I.; Heggie, D. C.; Portegies Zwart, S. F.. "The origin of chaos in the orbit of comet 1P/Halley". Monthly Notices of the Royal Astronomical Society 461 4 (2016): 3576-3584. http://dx.doi.org/10.1093/mnras/stw1504.
    10.1093/mnras/stw1504
  26. Martínez-Barbosa, C. A.; Brown, A. G. A; Boekholt, T.; Portegies Zwart, S.; Antiche, E.; Antoja, T.. "The evolution of the Sun's birth cluster and the search for the solar siblings withGaia". Monthly Notices of the Royal Astronomical Society 457 1 (2016): 1062-1075. http://dx.doi.org/10.1093/mnras/stw006.
    10.1093/mnras/stw006
  27. Boekholt, Tjarda; Portegies Zwart, Simon. "On the reliability of N-body simulations". Computational Astrophysics and Cosmology 2 1 (2015): http://dx.doi.org/10.1186/s40668-014-0005-3.
    10.1186/s40668-014-0005-3
  28. Portegies Zwart, Simon; Boekholt, Tjarda. "On the Minimal Accuracy Required for Simulating Self-gravitating Systems by Means of Direct N-body Methods". The Astrophysical Journal 785 1 (2014): L3. http://dx.doi.org/10.1088/2041-8205/785/1/l3.
    10.1088/2041-8205/785/1/l3
  29. Gonçalves Ferrari, G.; Boekholt, T.; Portegies Zwart, S. F.. "A Keplerian-based Hamiltonian splitting for gravitational N-body simulations". Monthly Notices of the Royal Astronomical Society 440 1 (2014): 719-730. http://dx.doi.org/10.1093/mnras/stu282.
    10.1093/mnras/stu282

Other

Software
  1. Boekholt, T. C. N.; Correia, Alexandre C. M.. "TIDYMESS". 2023.
Activities

Oral presentation

Presentation title Event name
Host (Event location)
2023/04 Chaotic triples and their irreversibility to the Planck length Varieties of Indeterminism
University of Geneva (Les Diablerets, Switzerland)
2023/01 Chaos in astrophysical N-body systems Outreach talk
International Amateur Astronomical Association (India)
2022/05 Dynamical formation channels for gravitational wave sources Colloquium
University of Warwick (United Kingdom)
2022/05 Formation of gravitational wave sources Gravitational Wave workshop
Niels Bohr Institute (Copenhagen, Denmark)
2021/05 Chaotic triples and their irreversibility to the Planck length Division of Dynamical Astronomy 52
AAS/DDA (United States)
2021/04 Dynamical chaos in N-body systems Colloquium
University of Coimbra (Portugal)
2019/11 Dynamical formation channels for gravitational wave sources Colloquium
University of Birmingham (United Kingdom)
2018/11 Modeling star cluster formation in the Slingshot paradigm Colloquium
Pontificia Universidad Catolica de Chile (Santiago, Chile)
2018/09 Accurate and precise N-body simulations Colloquium
Canadian Institute for Theoretical Astrophysics (Toronto, Canada)
2018/02 Star cluster formation in gas filaments: testing the Slingshot paradigm Colloquium
Tokyo University (Tokyo, Japan)

Supervision

Thesis Title
Role 		Degree Subject (Type)
Institution / Organization
2022 - 2023 Tidally Torqued ‘Spin Up’ in Hierarchical Triple Star Systems near to the Edge of Stability
Supervisor
 Astronomy (Master)
University of Oxford Department of Physics, United Kingdom
2022 - 2023 Modelling non-conservative tidal forces during Jacobi captures between Mercurian and Venusian Analogues
Supervisor
 Astronomy (Master)
University of Oxford Department of Physics, United Kingdom
2020 - 2023 Black Hole Binary Formation in AGN Discs: From Isolation to Merger
Co-supervisor
 Astronomy (PhD)
University of Oxford Department of Physics, United Kingdom
2020 - 2021 The relativistic Pythagorean 3-body problem
Co-supervisor
 Astronomy (Master)
Universiteit Leiden Sterrewacht Leiden, Netherlands
2020 - 2021 Effect of mass loss due to stellar winds on the final mass of supermassive black hole seeds in metal enriched dense nuclear star clusters
Co-supervisor
 Astronomy (PhD)
Universidad de Concepción, Chile
2018 - 2019 Stellar collisions in flattened and rotating Pop. III systems
Co-supervisor
 Astronomy (Master)
Universidad de Concepción, Chile
2018 - 2019 Formation of SMBH seeds in Population III star clusters through collisions: the importance of mass loss
Co-supervisor
 Astronomy (Master)
Universidad de Concepción, Chile
2016 - 2017 Stirred, not shaken: the fate of the Orion Nebula Cluster in the Integral Shaped Filament
Co-supervisor
 Astronomy (Master)
Universidad de Concepción, Chile
2016 - 2017 Collisions in Primordial Star Clusters: Formation Pathway for intermediate mass black holes
Co-supervisor
 Astronomy (Master)
Universidad de Concepción, Chile

Event organisation

Event name
Type of event (Role) 		Institution / Organization
2023/01 - Current SOC member and initiator Lorentz Center workshop: Tidal Evolution Research Review for Astrophysics (2023/01)
Workshop (Member of the Scientific Committee)
 Lorentz Center, Netherlands
2023/01 - 2023/07 SOC member of Gravitational Wave Sessions. National Astronomy Meeting 2023 (Cardiff, UK). (2023/07)
Conference (Member of the Scientific Committee)
 University of Wales Cardiff, United Kingdom
2019/05/12 - 2019/05/15 LOC workshop: Multi-messenger astronomy with SKA precursors and pathfinders, a capacity building workshop. More info: http://mmska2019.av.it.pt/ (2019/05/12 - 2019/05/15)
Workshop (Member of the Organising Committee)
 Instituto de Telecomunicações Campus Universitário de Santiago, Portugal

Ad Hoc journal article review

Journal title (ISSN) Publisher
2021 - Current Revista Mexicana de Astronomia y Astrofisica
2017 - Current Monthly Notices of the Royal Astronomical Society

Course / Discipline taught

Academic session Degree Subject (Type) Institution / Organization
2018/10/19 - 2018/11/11 Introduction to the AMUSE software framework (Bachelor) Universidad de Concepción, Chile

Interview (newspaper / magazine)

Activity description Newspaper / Forum
2020/04/06 Science News: Quantum mechanics means some black hole orbits are impossible to predict Science News
2020/04/04 Forbes: Ask Ethan: Why Can't Time Be Reversed For Three-Body Systems? Forbes
2020/03/31 New Scientist: Even a computer the size of the universe can’t predict everything New Scientist

Mentoring / Tutoring

Topic Student name
2022/09 - 2022/12 Mathematical Methods Five 2nd year Physics students
Distinctions

Award

2023 NASA Postdoctoral Program Fellowship
Oak Ridge Associated Universities, United States
2018 Young Doctor Award
Universidade de Aveiro Centro de Investigação e Desenvolvimento em Matemática e Aplicações, Portugal
2014 Wim Nieuwpoort Award
SURFsara, Netherlands

Other distinction

2021 DiRAC HPC facilities: 2M cpu hours of computing time
Distributed Research using Advanced Computing (DiRAC), UK, United Kingdom
2020 Humboldt Post-doctoral Fellowship
Alexander von Humboldt-Stiftung, Germany
2016 FONDECYT Post-doctoral Fellowship
Comisión Nacional de Investigación Científica y Tecnológica Fondo Nacional de Desarrollo Científico y Tecnológico, Chile
2016 FCT Post-doctoral Fellowship
Fundação para a Ciência e a Tecnologia, Portugal