Postdoc — NWO Rubicon Fellow & IAU TGF Fellow
Oct 2026–Present, LIRA, Observatoire de Paris. The Milky Way as a laboratory for first stars and dark matter.
Astrophysicist (she/her) | IAU TGF Fellow | NWO Rubicon Fellow at LIRA - Observatoire de Paris
I am Akshara Viswanathan. I come from the beautiful costal city of Chennai, India, and found my way into astronomy through a bachelor in engineering in India, a masters in astrophysics in the UK, and a PhD in the Netherlands. Currently, I live and do research in Paris, France (my 7th country of astronomy research). These days I study some of the Milky Way’s oldest stars and the streams left behind as smaller galaxies joined it. I want to use them to learn more about the very first stars that formed in the Universe and the nature of the mysterious dark matter. I like turning huge space-based and ground-based telescope catalogues and new observation I make from telescopes around the world into stories about how our Galaxy formed.
Oct 2026–Present, LIRA, Observatoire de Paris. The Milky Way as a laboratory for first stars and dark matter.
Feb 2025–Sep 2026, Astronomy Research Centre, University of Victoria. Decoding the Galactic Ancestry. NFC group
Oct 2020 - Dec 2024, University of Groningen (one thesis chapter at Flatiron Institute, New York). Mapping the ancient Milky Way through metal-poor stars. Galactica group
2019 - 2020, University of Glasgow. Gravitational lens models and binary black holes.
2015 - 2019, Anna University. Tri-band wearable antenna for off-body communication.
Summer 2018, University of Victoria. Merger fractions in local AGN hosts. Summer 2017, Institute for Plasma Research. Whistler waves in laboratory plasma.
Mapping the ancient Milky Way through metal-poor stars
My PhD thesis (supervised by the amazing Else Starkenburg, and Amina Helmi) uncovers the Milky Way’s history through its oldest stars: mapping the inner and outer halo, tracing stellar streams and merger remnants, and charting the proto-Galaxy’s gradual transition into an ordered, rotating disc.
The thesis cover is a Marauder’s Map of the Milky Way, with its evolutionary stages arranged in time around an artistic Galaxy. My thesis defense day was one of the most emotional and beautiful days of my life! I wore an Indian saree with all my research projects painted on it together with a Milky Way, stellar streams, and my favourite Gaia satellite!
In my thesis, I also drew a water-colour based Galactic archaeology comic as a "Summary for non-experts", for my 3.5-year old nephew to understand my thesis. I had a lot of fun with it! Hopefully, I continue drawing more science comics.
Please credit the wallpaper and comics if you reuse it.
Mapping the distant Milky Way halo with metal-poor red giants out to more than 100 kpc.
Tracing the gradual spin-up of the ancient Milky Way from the proto-Galaxy to the high-alpha disc.
Spectroscopic follow-up of VMP stars across the Milky Way, including new members of the C-19 stream.
A metallicity catalogue of bright VMP stars from Gaia RVS spectra.
A Gaia DR3 halo catalogue reaching beyond reliable parallax distances.
Complex stream morphologies in GD-1, Jhelum, Phlegethon, and Sagittarius.
I’ve supervised six (5w, 1m) completing BSc theses and three (2m, 1w) PhD thesis chapters
I gave a guest lecture in UVic’s graduate-level Galactic Archaeology course. At Groningen, I taught undergraduate Cosmology and Physics of Galaxies.
AGN, galaxy mergers, exoplanets...
Gravitational waves, whistler waves, wearable antennas, and early engineering research.
More publications and observing grants in Galactic Archaeology and nearby-universe astrophysics.
Survey collaborations, spectroscopic tools, and software for Galactic archaeology.
Research seminars, public astronomy talks, and conversations about my path into science.
Explore talks & interviews
Inclusive astronomy events, mentoring, and community outreach in Chennai, Groningen, Victoria.
Explore EDI & outreach
Photos from conferences and astronomy events.
View gallery
I love astronomy so much that I also found love within our field. My wonderful partner, Ewoud Wempe, is on a similar quest to understand how our Galaxy and neighbouring galaxies formed and evolved, but from a simulations perspective. Outside work, we enjoy crazy hikes and rock climbing together; I also enjoy pole-dancing, running, cycling, snorkeling, looking after my plants, and making delicious Indian food.
Under construction
A personal journey on colourism, jokes, and belonging in India.
Read postIf you have any questions or want to collaborate, you can reach me at akshara.viswanathan@abcobs.examplepm.fr | astroakshara97@abcg.examplemail.com or the offices at Les Communs, building 2 (office 161, orange corridor!), the beautiful Observatoire de Paris - Meudon campus