Joachim's research page

Joachim's researcher page

Research positions

• PostDoc/researcher at Uppsala university: 2021 - ongoing.

• PostDoc at Royal Observatory of Belgium: 2018 (1 May) - 2019 (30 June).

• PhD position at Chalmers university of technology: 2011 - 2016 (defended thesis 30 September 2016).

Other work experiences

• Outreach/Lecturer at Slottsskogen Observatory: September 2020 - December 2021.

• Popular science author at online editorial of Populär Astronomi: July 2017 - ongoing.

• Math and physic teacher for Swedish 7th and 9th grade: January 2017 - March 2017.

• Various observational assistant positions: November 2016, June 2017.

Links

• Github: https://github.com/jwiegert

• Researchgate: https://www.researchgate.net/profile/Joachim_Wiegert

• Linkedin: https://www.linkedin.com/in/joachim-wiegert-0610a51b0/

Publications

First author

 Asymmetries in AGB stars and their winds
 Radiative transfer of time dependent 3D RHD models
 J. Wiegert, B. Freytag, and S. Höfner
 In preparation for publication in Astronomy & Astrophysics in 2024

 Asymmetries in AGB stars and their winds
 From 3D RHD models to synthetic observables
 J. Wiegert, B. Freytag, and S. Höfner
 To be submitted to Astronomy & Astrophysics in January 2024

 How to disentangle geometry and mass-loss rate from AGB-star spectral energydistributions. The case of EP Aquarii
 J. Wiegert, M.A.T. Groenewegen, A. Jorissen, L. Decin, and T. Danilovich
 Astronomy & Astrophysics, 642, A142, 15 pp (2020)
 DOI: 10.1051/0004-6361/202038029
 https://www.aanda.org/articles/aa/abs/2020/10/aa38029-20/aa38029-20.html

 94 Ceti: a triple star with a planet and dust disc
 J. Wiegert, V. Faramaz, F. Cruz-Saenz de Miera
 Monthly Notices of the Royal Astronomical Society, 462 (2), 1735-1748 (2016)
 DOI: 10.1093/mnras/stw1682
 https://academic.oup.com/mnras/article-abstract/462/2/1735/2589424

 How dusty is alpha Centauri? Excess or non-excess over the infrared photospheres of main-sequence stars
 J. Wiegert, R. Liseau, P. Thébault, G. Olofsson, A. Mora, G. Bryden, J. P. Marshall, C. Eiroa, B. Montesinos, D. Ardila, J. C. Augereau, A. Bayo Aran, W. C. Danchi, C. del Burgo, S. Ertel, M. C. W. Fridlund, M. Hajigholi, A. V. Krivov, G. L. Pilbratt, A. Roberge, G. J. White, and S. Wolf
 Astronomy & Astrophysics, 563, A102, 15 pp (2014)
 DOI: 10.1051/0004-6361/201321887
 http://www.aanda.org/articles/aa/abs/2014/03/aa21887-13/aa21887-13.html

Co-authored

 Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 um
 R. Amanullah, J. Johansson, A. Goobar, [...] and J. Wiegert (39 authors)
 Monthly Notices of the Royal Astronomical Society, 453, 3300-3328 (2015)
 DOI: 10.1093/mnras/stv1505
 https://academic.oup.com/mnras/article-abstract/453/3/3300/1074216

 alpha Centauri A in the far infrared. First measurement of the temperature minimum of a star other than the Sun
 R. Liseau, B. Montesinos, G. Olofsson, G. Bryden, J. P. Marshall, D. Ardila, A. Bayo Aran, W. C. Danchi, C. del Burgo, C. Eiroa, S. Ertel, M. C. W. Fridlund, A. V. Krivov, G. L. Pilbratt, A. Roberge, P. Thébault, J. Wiegert, and G. J. White
 Astronomy & Astrophysics, 549, L7, 5 pp (2013)
 DOI: 10.1051/0004-6361/201220776
 http://www.aanda.org/articles/aa/abs/2013/01/aa20776-12/aa20776-12.html

 The effective stability parameter for two-component galactic discs: is Q-1 ~ Qstars-1 + Qgas-1 ?
 Alessandro B. Romeo, Joachim Wiegert
 Monthly Notices of the Royal Astronomical Society, 416, 1191–1196 (2011)
 DOI: 10.1111/j.1365-2966.2011.19120.x
 https://academic.oup.com/mnras/article/416/2/1191/1059217

Thesis

 Circumstellar dust emission from nearby Solar-type stars
 J. Wiegert
 Thesis for the degree of Doctor of Philosophy, Chalmers University of Technology,
 Department of Earth and Space Sciences, Göteborg, Sweden 2016
 ISBN 978-91-7597-443-9
 http://publications.lib.chalmers.se/publication/241098-circumstellar-dust-emission-from-nearby-solar-type-stars

 Gravitational Instability of Galactic Discs
 J. Wiegert
 Thesis for the degree of Master of Science, University of Gothenburg, Department of
 Physics, Göteborg, Sweden 2010
 http://publications.lib.chalmers.se/publication/134167-gravitational-instability-of-galactic-discs

Popular science

• test

Conference contributions, letters etc.

 Origin and fate of dust in our universe, Gothenburg, Sweden, 2023
 Poster: Radiative transfer through 3D models of dust clouds around AGB-stars

 SU+UU-conference (for early career researchers), Stockholm, Sweden, 2023
 Contributing talk: 3D radiative transfer simulations of envelopes around cool giant stars

 EXWINGS-Workshop, Uppsala, Sweden, 2023
 Contributing talk: Radiative transfer simulations of CO5BOLD results

 Astronomdagarna, Gothenburg, Sweden. 2022
 Poster: 3D radiative transfer simulations of envelopes around luminous cool giant stars

 The Sharpest Eyes on the Sky, Exeter, Great Britain, 2022
 Poster: Simulating scattering and emission from dust around luminous cool giant stars

 IAU General Assembly, symposium S343, Vienna, Austria, 2018
 Poster: Exploring dust mass and dust properties of nearby AGB stars
 Published in conference proceedings:
 J. Wiegert, M. A. T. Groenewegen and the STARLAB team
 Cambridge University Press. Volume 14, Symposium S343 (Why Galaxies Care About
 AGB Stars: A Continuing Challenge through Cosmic Time). August 2018 , pp. 542-543. (2019)
 DOI: 10.1017/S1743921318004982
 https://publi2-as.oma.be/record/4591

 Pathways towards habitable planets, Bern, Switzerland, 2015
 Poster: Discs and stable orbits around the planet-hosting triple star 94 Ceti

 NOT spectroscopic classifications of optical transients
 F. Taddia, J. Sollerman, E. Gafton, G. Micheva, E. Freeland, A. Macchiavello, T. Mansson, J. Wiegert
 The Astronomer's Telegram, 5087 (2013)
 http://www.astronomerstelegram.org/?read=5087

 YERAC: Young Europan Radio Astronomers Conference, Bielefeld, Germany, 2013
 Poster: The SEDs of α Centauri and the detectability of dust emission