Joe Callingham
@astrojoe.bsky.social
4K followers 250 following 200 posts
Dutch-Australian | Astrophysicist | Head of the Square Kilometre Array (SKA) Science Group at ASTRON | Associate Professor at the University of Amsterdam
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astrojoe.bsky.social
More cool state quantum work awarded the Nobel!
astrojoe.bsky.social
JWST knows how to make things shine!
astrojoe.bsky.social
Note that this position is predicated on funding being awarded. I will know if this is the case at the end of October.
astrojoe.bsky.social
While some experience in radio astronomy, stellar astrophysics, or exoplanet science would be helpful - curiosity and enthusiasm are the only real prerequisites.
astrojoe.bsky.social
Note that I am happy to take the project in any direction (technical, theoretical, observational) under the broad remit of what radio can tell us about stars, planets and space weather.
astrojoe.bsky.social
Are you looking to do a PhD in astronomy? Are you interested in radio stars and exoplanets? Then you should apply to do a PhD at @api.uva.nl with me! You can find more about the exciting project below. Applications are due 3rd of November!

api.uva.nl/vacancies/ph...
PhD research topics - Anton Pannekoek Institute for Astronomy
PhD research topics
api.uva.nl
astrojoe.bsky.social
Are you excited about playing with some of the coolest radio telescopes in the world? Want to discover something new about the Universe? What independence to explore novel ideas? Well then I have the job for you! At @astronnl.bsky.social we are advertising for the Bell Burnell Fellowship.
astrojoe.bsky.social
Congrats Ivey! Looking forward to you joining us here in NL!
astrojoe.bsky.social
It would be absolutely awesome if Australia formally joined Horizon Europe. I am sure we would get more back than we put in based on the calibre of scientists in the country.
science.org.au
The Australian Academy of Science welcomes the announcement that the Australian Government has started exploratory talks on Australia’s possible association to Horizon Europe. Learn more: www.science.org.au/news-and-eve...
astrojoe.bsky.social
Hawking was mentioned too. Not sure about any other
astrojoe.bsky.social
I have a desk companion today
astrojoe.bsky.social
At CSIRO today to talk all about wide-field radio monitors. Exciting times ahead. Thanks Josh Pritchard for organising. Great opening talk by Ron Ekers on the history and future of all-sky monitors
astrojoe.bsky.social
I am enjoying learning about all things that go *bang* in the radio sky in Sydney this week. Thanks Dougal, Tara and team for organising!
taramurphy.bsky.social
In the middle of a week of interesting talks on radio transients at Dynamic Radio Sky 2025.

Is great to welcome so many people to @sydney.edu.au and @ozgrav.bsky.social for our meeting - and particularly all postdoctoral reseachers and PhD students.

The next generation of #RadioAstronomy!
A photo of about 60-70 radio astronomers outside the School of Physics building at the University of Sydney. The building is a heritage sandstone building. It is a sunny day
astrojoe.bsky.social
Once more to the old country. This time for The Dynamic Radio Sky Conference. Will be in Australia for 2 weeks (visiting CSIRO and USyd).
astrojoe.bsky.social
What an amazing image and a fantastic result by @astroryan.bsky.social. This JWST image casts a completely new light on the first image we made of this star in 2019 with @eso.org's VLT. Well done Ryan and team!
astroryan.bsky.social
Exciting news! My second first-author paper is out on the arXiv today!! arxiv.org/abs/2507.14610

We present a brand new JWST image of the Apep colliding wind binary in the mid-infrared, and we study what this nebula can tell us about the THREE stars in it's centre. Read on for more... 1/?🔭🧪
The image shows a false-colour image of the Apep colliding wind nebula as taken by the James Webb Space Telescope (JWST) in the mid-infrared. In the centre of the image, there is an orange-coloured spiral coil of dust, not dissimilar in shape from a snail's shell. There are two concentric repeats of the coil that are larger and encompass the inner shell, and these further out shells of dust are coloured red and get dimmer as they get further from the centre of the image. These far out coils of dust look somewhat like translucent spheres.
At the very centre of the image is a small spikey object which are the three stars in Apep that create and hide behind the dust shells. There are stars scattered throughout the image, each with a snowflake-like 'point spread function' that spreads the central brightness of the stars into diffraction spikes.
Image credit: Shashank Dholakia for R M T White et al 2025. 'The Serpent Eating Its Own Tail: Dust Destruction in the Apep Colliding-Wind Nebula'. PI: Yinuo Han.
astrojoe.bsky.social
Halifax completed another module in his PhDog - a visit to a radio telescope (along with some tinkering)
Reposted by Joe Callingham
taramurphy.bsky.social
Last chance to register for our upcoming conference "The Dynamic Radio Sky 2025"

Join us @sydney.edu.au from July 28th to August 1st, 2025 to discuss radio transients of all kinds!

#RadioAstronomy #AstroSci
taramurphy.bsky.social
We have released the draft program for "The Dynamic Radio Sky 2025"!

Looking forward to welcoming #RadioAstronomy (transients) people from all around the world, to our wonderful @sydney.edu.au campus in July/August.

drs2025.github.io/programme/
Screenshot from the Dynamic Radio Sky 2025 conference website.

The image consists of a telescope in the foreground, with a neutron star (half purple half blue) in the background.