About me

I am a researcher working on fields like relativistic astrophysics and computational physics focusing mainly on compact objects like neutron stars and black holes. For this I use tools such as pen & paper and supercomputers.

Currently I am a Nordita Fellow in Nordic Institute for Theoretical Physics (Nordita, Stockholm, Sweden). I am also an avid open-source science & software advocate so you can find most of my research and codes freely available.


I have a wide range of interdisciplinary research interests. Mostly I, however, like to focus on computational astrophysics.

  • High-energy astrophysics: accretion & accretion disks; neutron stars, pulsars, X-ray bursters; black holes
  • Plasma physics & (magnetized) fluid dynamics: collisionless plasma dynamics; turbulence
  • Dense plasma: equation of state of cold ultra-dense matter; universal relations
  • General relativity: ray tracing
  • Statistics: (Markov Chain) Monte Carlo methods; Bayesian analysis
  • Computer sciences: high performance computing; parallellization paradigms; neural networks
  • Mathematics: topology; knot theory

Recent publications & blog posts

Helium composition in 4U 1820-303

In the work led by Valery Suleimanov, we applied the direct cooling tail method to constrain the atmosphere composition of a neutron star in 1820. Our results show that helium is strongly favored.

Variable spreading layers of neutron stars

In the work led by Jari Kajava, we studied the interface between the neutron star and the accretion disk. This so-called spreading layer seemed not as constant as people have previously assumed!

Dynamic powerlaw method for X-ray bursts

How do X-ray bursts really cool? Is it a single-index powerlaw or maybe an exponential? We investigated this together with our student Jere Kuuttila.

Direct cooling tail method

Here we derived some corrections to our existing cooling tail method. This new method is then applied to a previously measured neutron star, identifying about 500 meter calibration error.

Scientific writing tips

A collection of scientific writing tips for Master students working with their thesis.

Traces of heavy metals in neutron star atmospheres

Some peculiar X-ray bursts are found to have atmospheres that are made almost completely of heavy metals. A radiatively driven wind might then ejects some of the burning ashes into the interstellar space.