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#Exoplanet

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Euclid Consortium

Later today, the first commercial launch of an #Ariane6 rocket is planned, after the maiden flight in July 2024 that was mostly successful. Ariane 6 had been the backup launcher for #Euclid for many years.

Originally and for many years, Euclid was slated to launch on a Russian #Soyuz from French Guyana, which changed following the invasion of Ukraine and the subsequent stop of collaboration of #ESA with Roskosmos, the company behind Soyuz.

After this, Ariane 6 became the primary launcher on launch slot 4 or 5, but given that Euclid was almost ready for launch already in 2022, alternatives were looked into, and in the end Euclid successfully launched with a US company on 1 July 2023.

So we've been following #Ariane6's development for a while. All the best for this launch 🤞🤞🏽🤞🏻.

Next #ESA #astronomy mission to be launched with Arianne 6 is the #exoplanet satellite #PLATO, towards the end of 2026.

All about today's launch: esa.int/Enabling_Support/Space

www.esa.intArianeAriane
#space
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Daniel Fischer

Highly reflective white clouds on the western dayside of an exo-Neptune: arxiv.org/abs/2501.14016 -> JWST provides insights into rare ultra-hot Neptune LTT 9779 b / Today's forecast - partially cloudy skies on an "ultra-hot Neptune": physics.ox.ac.uk/news/jwst-pro / nouvelles.umontreal.ca/en/arti #exoplanet

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arXiv.orgHighly reflective white clouds on the western dayside of an exo-NeptuneHighly-irradiated gas giant exoplanets are predicted to show circulation patterns dominated by day-to-night heat transport and a spatial distribution of clouds that is driven by advection and local heating. Hot-Jupiters have been extensively studied from broadband phase-curve observations at infrared and optical wavelengths, but spectroscopic observations in the reflected light are rare and the regime of smaller and higher-metallicity ultra-hot planets, such as hot-Neptunes, remains largely unexplored to date. Here we present the phase-resolved reflected-light and thermal-emission spectroscopy of the ultra-hot Neptune LTT 9779b, obtained through observing its full phase-curve from 0.6 to 2.8 $μ$m with JWST NIRISS/SOSS. We detect an asymmetric dayside in reflected light (3.1$σ$ significance) with highly-reflective white clouds on the western dayside (A = 0.79$\pm$0.15) and a much lower-albedo eastern dayside (A = 0.41$\pm$0.10), resulting in an overall dayside albedo of A = 0.50$\pm$0.07. The thermal phase curve is symmetric about the substellar point, with a dayside effective temperature of T$_\mathrm{eff,day}$ = 2,260$^{+40}_{-50}$ K and a cold nightside (T$_\mathrm{eff,night}$ <1,330 K at 3-$σ$ confidence), indicative of short radiative timescales. We propose an atmospheric circulation and cloud distribution regime in which heat is transported eastward from the dayside towards the cold nightside by an equatorial jet, leading to a colder western dayside where temperatures are sufficiently low for the condensation of silicate clouds.
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Daniel Fischer

The Roasting Marshmallows Program with IGRINS on Gemini South - WASP-121 b has Superstellar C/O and Refractory-to-volatile Ratios: iopscience.iop.org/article/10. -> IGRINS on Gemini South Detects Surprising Signatures in Dynamic Atmosphere of #Exoplanet WASP-121b: noirlab.edu/public/blog/wasp-1 - chemical clues revealed in atmosphere of ultra-hot Jupiter challenge astronomers’ understanding of how ‘roasting marshmallows’ form.

iopscience.iop.orgRadware Bot Manager Captcha
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RTN

#DLR:
"
Mission PLATO startet Ende 2026 mit Ariane-6-Trägerrakete
"
".. PLATO wird ab Ende 2026 mit 26 Kameras nach erdähnlichen Planeten an über 200.000 Sternen in der Milchstraße suchen
DLR leitet das Nutzlastkonsortium von PLATO und liefert Auslese-Elektronik und Elektronik zur Datenverarbeitung .."

dlr.de/de/aktuelles/nachrichte

30.1.2025

www.dlr.deMission PLATO startet Ende 2026 mit Ariane-6-TrägerraketeAm 29. Januar 2025 unterzeichneten ESA und Arianespace den Startvertrag für die Raumfahrtmission PLATO. Das DLR leitet das Nutzlastkonsortium, entwickelte und lieferte die Auslese-Elektronik sowie die Elektronik zur Datenverarbeitung zweier missionskritischer Kameras und ist wissenschaftlich stark an der Mission beteiligt.
#Ariane6#Astronomie#ESA
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Uni Göttingen

Extreme Winde auf #Exoplanet „WASP-127b“: Ein internationales Team unter Leitung unseres Instituts für #Astrophysik und #Geophysik hat Winde mit Überschallgeschwindigkeiten von bis zu 33.000 km/h gemessen. Die Forschung wurde am Very Large Telescope der Europäischen Südsternwarte (@esoastronomy) durchgeführt. Die Ergebnisse helfen, die Atmosphärendynamik ferner #Planeten besser zu verstehen: s.gwdg.de/rEafaZ; doi.org/n3g2

Künstlerische Darstellung der Überschallwinde auf „WASP-127b“ – Foto: ESO/L. Calçada
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IRAP

[Atmosphere, atmosphere ... ] 33,000 km/h, i.e. 9 km/sec! This is the speed of the #winds in the jet stream that encircles the equator of #exoplanet WASP-127b, a gas giant located some 520 light-years from Earth. Molecules of water vapor and carbon monoxide were also detected within this planetary #atmosphere.

The extreme meteorological conditions prevailing on the surface of WASP-127b were deduced from measurements made using the CRIRES+ instrument installed on the Very Large Telescope (VLT) of the @esoastronomy (ESO).

Details+ : irap.omp.eu/en/2025/01/extreme

This artist’s visualisation of WASP-127b, a giant gas planet located about 520 light-years from Earth, shows its newly discovered supersonic jet winds that move around the planet’s equator. With a speed of 9 km per second (33 000 km/h), this is the fastest jetstream of its kind ever measured in the Universe. By tracking the speed of molecules in the atmosphere with the CRIRES+ instrument on ESO’s Very Large Telescope, researchers found that one side of the planet’s atmosphere is moving towards us and the other away from us. This indicates that there is a powerful wind current going around the planet. Credit:ESO/L. Calçada
#astronomy#astrophysics
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