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Anders Johansen 🪨🌍🇺🇦

@astroandersj.bsky.social

142 followers 156 following 18 posts

Theoretical astrophysicist, with expertise in planet formation. Head of Planet Formation Group at University of Copenhagen / Lund University. Opinions my own. sites.google.com/view/planet-format…

Posts Replies Media

Reposted by Anders Johansen 🪨🌍🇺🇦

Ross Church @rpc25.bsky.social · 30/09/2026

We (Lund Observatory) have an open PhD position in theoretical astrophysics, to work with @astroandersj.bsky.social on studying how and where planets form in the Galaxy and the origin of interstellar comets. Application deadline December 1. lu.varbi.com/en/what:job/...

lu.varbi.com

Doctoral student in Astronomy and Astrophysics

Description of the workplace The Planet Formation Group at the Department of Physics (Division of Astrophysics) at Lund University is seeking a PhD student to work on models of planet formation on a g

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Anders Johansen 🪨🌍🇺🇦 @astroandersj.bsky.social · 05/04/2025

I really recommend this long read about Pakistan’s solar power boom.

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Reposted by Anders Johansen 🪨🌍🇺🇦

Richard L. @entosse.bsky.social · 31/03/2025

Advertisement!: PhD-summer school at the Globe Institute, UCPH 18-22 August. From interstellar dust to habitable planets and the conditions for life. Interdisciplinary lectures with perspectives from astronomy, cosmochemistry, geology, and astrobiology. For more see: www.dust2dna.dk

dust2dna.dk

Dust to DNA 2024

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Anders Johansen 🪨🌍🇺🇦 @astroandersj.bsky.social · 12/03/2025

“Sure we need to address global warming. But what about China?”

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Anders Johansen 🪨🌍🇺🇦 @astroandersj.bsky.social · 06/03/2025

Meanwhile in Heidelberg. Europe waking up to seeing our closest ally now run by conspiracy theorists and their sycophants.

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Anders Johansen 🪨🌍🇺🇦 @astroandersj.bsky.social · 25/02/2025

Let's see how many astrophysicists are on this platform compared to the other one. I want to advertise quickly a paper first-authored by my soon-finishing PhD student Jesper Nielsen, on the formation of the so-called radius valley for small exoplanets. arxiv.org/abs/2502.10186

t.co

https://arxiv.org/abs/2502.10186

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Anders Johansen 🪨🌍🇺🇦 @astroandersj.bsky.social · 14/02/2025

Pessimists sound clever. Optimists change the world.

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Anders Johansen 🪨🌍🇺🇦 @astroandersj.bsky.social · 27/11/2024

I published a rebuttal today in reaction to a recent claim that Earth did not form by pebble accretion. Our conclusion is that Earth likely formed by a combination of pebble accretion, large impactors and a giant impact. Questions and comments welcome. arxiv.org/abs/2411.17043

arxiv.org

Comment on "Did the terrestrial planets of the Solar System form by pebble accretion?"

Morbidelli, Kleine & Nimmo (2024) (MKN) recently published a critical analysis on whether the terrestrial planets in the Solar System formed by rapid pebble accretion or by the classical route of mult...

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Anders Johansen 🪨🌍🇺🇦 @astroandersj.bsky.social · 19/11/2024

Story in Scientific American about Vega’s planet-free debris disc. With quotes from me. I think it’s because of the low metallicity. www.scientificamerican.com/article/famo...

scientificamerican.com

Famous Star Hasn’t Formed Planets, and We Don’t Know Why

The nearby star Vega, featured in the 1997 movie Contact, appears to have a smooth disk devoid of giant planets for reasons we can’t explain

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Anders Johansen 🪨🌍🇺🇦 @astroandersj.bsky.social · 11/11/2023

NASA's Webb Findings Support Long-Proposed Process of Planet Formation "Webb finally revealed the connection between water vapor in the inner disk and the drift of icy pebbles from the outer disk" said principal investigator Andrea Banzatti webbtelescope.org/contents/new...

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Reposted by Anders Johansen 🪨🌍🇺🇦

Nienke van der Marel @nienkemarel.bsky.social · 10/11/2023

Whoa, this new study by e.g. @astroandersj.bsky.social shows how you can rapidly form giant planets at wide orbits, avoiding immediate inward migration. This could potentially explain the large gaps in disks! arxiv.org/abs/2311.04365

arxiv.org

The formation of wide-orbit giant planets in protoplanetary disks...

The presence of distant protoplanets could explain the observed gaps in dust emission in protoplanetary disks. Here we derive a novel analytical model to describe the temporal decay of the pebble...

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Anders Johansen 🪨🌍🇺🇦 @astroandersj.bsky.social · 06/10/2023

A great community note from that other site.

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Reposted by Anders Johansen 🪨🌍🇺🇦

Torsten Åkesson @torstenakesson.bsky.social · 05/10/2023

Tack för att ni följer.

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