Bill MinarikSep 4, 2025

Re-post from MinCup past:
The non-detection of #perovskite in non-stars shows that it's there.

Cool red dwarf stars have deep absorption bands from TIO gas in their atmospheres. In yet cooler brown dwarfs those bands have disappeared: opaque perovsite dust has condensed, making the titanium invisible.

Spectra from Kesseli et al. (2017), images from Gabicca, LEAP group.

#MinCup25 #Astronomy #RedDwarf #BrownDwarf #L_Dwarf #MDwarf

Show threadBibiana Prinoth (moved!)Mar 16, 2024

We are now at the point in the field, where we can compare with #atmospheric #escape #models and there is plenty left to learn and understand.

On to #composition: TESS has achieved (and exceeded) the goal of the measurement of 50 sub-Neptune masses.

Theory predicts water planets, but where are they? Evidence? Luque+ Palle showed observational evidence for #Mdwarf systems.

But: #theory needs to catch up with what we observe. #ExSSV

Ansgar Schmidt Feb 2, 2024
A Super-Earth (and Possible Earth-Sized) Exoplanet Found in the Habitable Zone https://www.universetoday.com/165558/a-super-earth-and-possible-earth-sized-exoplanet-found-in-the-habitable-zone/ #photoevaporationvalley #spectroscopy #sub-neptune #super-earth #densitygap #exoplanets #radiusgap #reddwarf #science #mdwarf #stars #jwst
A Super-Earth (and Possible Earth-Sized) Exoplanet Found in the Habitable Zone

This Super-Earth has something to tell us about the exoplanet population, but we need the JWST to reveal what that is.

Universe Today
exocastOct 2, 2023
In this month's #exocast episode we chat with #exoplanet astronomer Dr. Max Günther! We chat about transit detection with #NGTS & #TESS, the ESA #CHEOPS mission, flares and UV exposure for #MDwarf planets, chemical experiments in #ZeroG, and much more!
Check it out on our website or on any good #podcast app. https://www.exocast.org/exocast-70b-dr-max-gunther-talks-transits-cheops-chemistry-in-zero-g/ #Space #SciComm
Exocast-70b: Dr. Max Günther talks transits, CHEOPS & chemistry in zero-g

This month the exocast team chat to exoplanetary astronomer Dr Maximillian Guenther. We talk about finding transiting exoplanets with TESS & NGTS, open-source transit modelling, flares from M-d…

exocast
Andrew MannJul 2, 2023
Is there some simulated #Euclid data for stars somewhere? Wanna see if I can do #mdwarf parameters with the #spectra #Astrodon #stars #coolstars #esa