A souvenir from #BadHonnef23

The conference venue is somewhere in the picture, too :)

Paul can define an abiogenesis based on the availability of UV radiation for the prebiotic networks. Most of the terrestrial planets we know lie within the liquid water zone, however, cannot start these prebiotic networks due to a lack of UV.

Stellar flares might provide the necessary UV light, but even flare active M dwarfs don't seem to be able to produce enough UV either. But flares can also destroy atmospheres. Avoiding the latter, while having enough UV is very challenging.

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The lifetimes of different species like ferrocyanide, which acts as an electron provider, are important for the operation of these networks.

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There are more networks (all of which are happening in water, as you might have guessed), among them the Cyanosulfidic Network, which forms the building blocks of life, e.g. proteins, cell membranes, RNA, and DNA.

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Paul introduces us to the Adenine and Formose prebiotic networks. First note: they are very complicated and messy.

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Last talk of the conference by Paul Rimmer titled

Timing is Everything: Kinetics of UV-Driven Prebiotic Chemistry

#BadHonnef23 #astronomy #Habitability #Astrodon

JWST's mid-infrared instrument MIRI can detect methane in various terrestrial planets.

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John introduces four different terrestrial atmospheres he studies:

Earth-like
Carbon-dioxide
Primary (mostly hydrogen)
Steam (lots of water)

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Back from the coffee break, we continue with John Lee Grenfell, who is talking to about the

Effects of High Energy Particles on Atmospheric Chemistry in the Solar System and Beyond

#BadHonnef23 #Astrodon #astronomy #solarsystem

Back from the coffee break, we continue with John Lee Grenfell, who is talking to about the

Effects of High Energy Particles on Atmospheric Chemistry in the Solar System and Beyond

#BadHonnef23

Miriam shows us the chemistry of ozone destruction after geomagnetic events. But below 40 km, ozone seem not to be affected? Miriam says, this might not actually be the case, and propagate to weather patterns (provided they are sufficiently energetic).

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Next talk by Miriam Sinnhuber:

The Impact of Stellar Energetic
Particles on the Composition of
Planetary Atmospheres

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The discussion is on! People are questioning the assumptions:

What if particles are suppressed by strong magnetic fields?

What about the X-ray radiation?

Answers are part of ongoing work, Konstantin replies.

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Categories of exoplanet atmospheres around TRAPPIST-1:

dry and dead
wet and dead
wet and alive

They react differently to the impact of energetic particle events.

Konstantin wants to explore a wider mass regime, and more steamy atmospheres.

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INCREASE models the impact of energetic particles of various activity levels on different atmospheres, like Modern Earth, Modern Venus, and TRAPPIST-1 planets.

Konstantin shows how energetic particle events can mess up biosignatures like ozone and methane.

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Their modeling project, INCREASE, is a collaboration between multiple institutes in Germany, and has been ongoing since 2016.

Konstantin goes through the different constituents of INCREASE, including the last step -- spectra of possible biosignatures.

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Their modeling project, INCREASE, is a collaboration between multiple institutes in Germany, and has been ongoing since 2016.

Konstantin goes through the different constituents of INCREASE, including the last step -- spectra of possible biosignatures.

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Konstantin and his collaborators model the space the whole way -- from the star down into the atmosphere of the planet.

He shows us: Many puzzles and assumptions are to be solved and questioned along the way.

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Konstantin Herbst is waking up the audience with the first talk of the day:

Modeling the Impact of Cosmic Rays on (Exo)planetary Atmospheres

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Back to conference tooting!

Today is the last day of

🌌 From the Heliosphere to
Astrospheres - Lessons for
Exoplanets and their Habitability,

a neat little meeting in beautiful Bad Honnef in South Germany.

#BadHonnef23