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Stellar Astrophysics Centre:

Research on the Sun, stars

and extra-solar planets


Artist’s impression of a hot Jupiter (right) and its cool host star. Credit: AIP/Kristin Riebe

09.09.2019 | Medarbejdere

Potassium has been detected with very high significance in the upper atmosphere of exoplanet HD 189733b

SAC's Carolina von Essen is co-author of the recent paper in MNRAS Letters. Follow this link to the full press release from Leibniz-Institut für Astrophysik Potsdam.

SONG telescope on Tenerife in summer 2019. Photo: RMS Photography.

24.07.2019 | Offentligheden / Pressen, Studerende, Medarbejdere

On the road to SONG

Friend of SAC and eminent astrophotographer Ruslan Merzlyakov authors today's Astronomy Picture of the Day

Solens overflade er et travlt sted. Det lyse stykke nær horisonten er en stor solplet. (Foto: NASA/TRACE)

12.07.2019 | Institut for Fysik og Astronomi, Medarbejdere, Offentligheden / Pressen, Studerende

Næsten 250 år gamle observationer fra Rundtårn giver Solen mindre ansvar for den globale opvarmning

Simulation of wind erosion on Mars. The quartz ampoule contains particles of olivine basalt and a Mars-like atmosphere. By shaking the ampoule, the researchers simulate wind-generated saltation, ie. that the wind causes the sand grains to make short jumps over the surface. The friction of the particles creates electrical charges, and the yellow star illustrates that an argon atom has lost an electron. The small electrical charges cause the particles to glow slightly, as illustrated in the four pictures to the right. Graphics: Mars Simulation Laboratory, AU

02.07.2019 | Institut for Fysik og Astronomi, Offentligheden / Pressen, Medarbejdere, Studerende

Methane vanishing on Mars: Aarhus researchers propose new mechanism as an explanation

The processes behind the release and consumption of methane on Mars have been discussed since methane was measured for the first time for approx. 15 years ago. Now, an interdisciplinary research group from Aarhus University has proposed a previously overlooked physical-chemical process that can explain methane's consumption.

Looking inside a rapidly oscillating Ap star.The diversity of physical phenomena taking place in their outer layers, makes roAp stars ideal testbeds to the modelling of stellar physics. Credit: Victoria Antoci (Stellar Astrophysics Centre, Aarhus University)

03.06.2019 | Medarbejdere, Studerende, Offentligheden / Pressen

Fastest known roAp pulsator in recent MNRAS paper

SAC's Victoria Antoci is coauthor of a recent paper on the first observations by TESS of Ap stars; some of them rapidly oscillating roAp pulsators.

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