Sylvestre Lacour

Figure from Squicciarini et al. showing three panels with a white dot on a black and blue stippled background, indicating the location of the planet in GPI and SPHERE IRDIS data.&10;

Three panel image from Jones et al. showing a white dot on a stippled background. The planet is in the 11 o'clock position in all three images.

Two papers announcing the discovery of a directly imaged 6 Jupiter mass planet around binary system HD 143811 AB Squicciarini+ and Jones+ in Sco-Cen - Keck, Gemini and VLT all imaging this companion and confirmed with several years of common proper motion. #astrodon #exoplanet #exosci

A series of concentric black and white ovals against a black background, with a dim red dot in the lower left of one of the paths of a black ring. The ovals are dust rings around a young star, and the red dot is a 5 Jupiter mass exoplanet called WISPIT 2b.

Proud supervisor moment: #LeidenObservatory graduate student Richelle van Capelleveen led one of two papers on our discovery of WISPIT 2b, a 5 Jupiter mass exoplanet clearing a path in a circumstellar disk. Laird Close and his team saw it in H-alpha, indicating gas accretion #astrodon 🔭 🧪

Nouvelle actu au @liraastro.bsky.social : première détection d'ammoniac dans l'atmosphère d'un compagnon de masse planétaire, GJ504b, dont on ne sait pas vraiment si c'est une exoplanète ou une naine brune. Selon les estimations GJ504b pourrait avoir une masse de 1 ou 23 masses de Jupiter. 1/4

1/ ☄️ Comet C/2024 G3 (ATLAS) is gracing our skies, and we’d like to share some amazing images from ESO's Paranal Observatory in Chile!

This stunning shot by our friend Yuri Beletsky, with the comet next to an Auxiliary Telescope, is today's Astronomy Picture of the Day. Congrats, Yuri! 🔭 🧪

rotating european space agency GIF - Find & Share on GIPHY Discover & share this rotating european space agency GIF with everyone you know. GIPHY is how you search, share, discover, and create GIFs.

So long and thanks for all the fish! I just observed my last star this morning... #GaiaDPAC and @esa.int Gaia teams will do their best to make some great data releases from the data I gathered! #GaiaDR4 in 2026, #GaiaDR5 around the end of the decade. Keep posted for our news today at 10:00 CET.

Il y a 20 ans aujourd'hui, la sonde Huygens de l'agence spatiale européenne se posait sur Titan, lune de Saturne avec un cycle du méthane : des rivières, des lacs des nuages...de méthane!

The @esa.int Gaia satellite takes its final ever observations today 😭🔭

During its final few months of life, some technical tests will be performed, during which it will be much easier to see from Earth than usual. ESA published a guide on how to try and take photographs of the satellite:

@obs-paris-psl.bsky.social vous présente ses meilleurs vœux!

2025 marque un tournant important : une nouvelle organisation scientifique, une nouvelle identité graphique, de nouveaux sites internet.

Suivez-nous pour découvrir toutes les nouveautés qui façonnent notre avenir.
@psl-univ.bsky.social