Guillaume Bertrand
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guillaumebertrand.bsky.social
Guillaume Bertrand
@guillaumebertrand.bsky.social
200 followers 510 following 51 posts
Amateur astronomer (Astrophysics, Spectroscopy, Photometry...)
🪐 🌈 🔭 | Science lover | Musician 🎵
https://guillaumebertrand.notion.site
https://staros-projects.org
https://www.sunscan.net
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guillaumebertrand.bsky.social
Guillaume Bertrand @guillaumebertrand.bsky.social · Jun 26
Here's a cool spectro and photometry experiment to measure the mass of supermassive black holes from your backyard :) Based on single-epoch estimators in broad-line AGN. 🌈🔭 #astrophysics #astronomy #spectroscopy #photometry

guillaumebertrand.notion.site/Estimating-b...
guillaumebertrand.bsky.social
Très fier d’avoir reçu le Grand Prix de l’innovation SAF ! 🏆 Nous avons été récompensés par la Société astronomique de France et son président, Roland Lehoucq pour le projet #SUNSCAN by #STAROS. Une réussite collective avec V. Desnoux, C. Buil, O. Garde et Matthieu Le Lain (@matlastro.bsky.social)
November 30, 2025 at 9:07 AM
Reposted by Guillaume Bertrand
siril.org
A new script is now available. It allows you to create HR diagrams on your linear images!!!

Have fun
November 22, 2025 at 2:21 PM
Reposted by Guillaume Bertrand
astroarxiv.bsky.social
Orbital parameters of the bright binary alpha Draconis based on amateur spectra from the STAROS database. G. Bertrand et. al. https://arxiv.org/abs/2511.17206
Figure 1 Figure 2 Figure 3 Figure 4
November 24, 2025 at 7:06 AM
Reposted by Guillaume Bertrand
eso.org
ICYMI, VLT observations have revealed the unique shape of a star’s explosion just a day after detection.

It's the first time that astronomers unveil the shape of the explosion at its earliest stage, providing insights into the deaths of massive stars.
https://www.eso.org/public/news/eso2520/

🔭 🧪 ☄️
November 13, 2025 at 10:04 AM
Reposted by Guillaume Bertrand
sciencecqfd.bsky.social
On vous invite à vous rapprocher de votre radio 📻
La Science CQFD ça a déjà commencé !
November 13, 2025 at 3:05 PM
Reposted by Guillaume Bertrand
galacticamille.com
Voilà l'image de présentation de mon jeu #NebulaeOriginsOfStars ! Je me dirige potentiellement vers un financement participatif. Est-ce que ça vous hype?
⚙️et🎨: Camille Boissel Phd astrophysique et médiatrice scientifique #NoAI

#Vulgarisation #SciComm #Astrophysique #J2S #JeuxDeSociété #BoardGames
Image de description de mon jeu de société Nebulae : Origins Of Stars. En haut à gauche, le logo du jeu (Nebulae en blanc et Origins Of Stars en noir avec une illustration d'une "vraie" étoile bleue en fond). En bas à gauche : 8 ans et +, 2-5 joueur-euses, 60 min, mécaniques et illustration : Camille Boissel En bas à droite : Bluesky : @galacticamille.com www.galacticamille.com logo GalactiCamille En haut à droite : "Un jeu de dextérité et de stratégie sur la formation des étoiles, avec de vrais morceaux d'astrophysique à l'intérieur !" Au centre, une partie de jeu en cours, avec diverses cartes et plateaux, ainsi qu'une nébuleuse constituée de nuages représentés par des polyominos de plastique en 3D. Au fond, les sacs contenant les nuages, la boîte du jeu. Le tout est placé dans un décor d'illustration représentant une nébuleuse.
November 11, 2025 at 8:56 PM
guillaumebertrand.bsky.social
Le soleil en direct toujours avec le petit télescope solaire #SUNSCAN. De belles tâches solaires et protubérances ! #STAROS
November 9, 2025 at 12:27 PM
guillaumebertrand.bsky.social
Le soleil hier avec le petit télescope solaire SUNSCAN 😃🔭🌞
November 9, 2025 at 8:36 AM
guillaumebertrand.bsky.social
Proud to present the new version of the SUNSCAN mobile app: v1.4.3. 🔭🚀 Available on iOS and Android. Lots of new features coming 😁 And for those who don't know about #SUNSCAN, come discover this smart solar telescope designed by the #STAROS association as an open source project here: www.sunscan.net
October 30, 2025 at 8:03 PM
Reposted by Guillaume Bertrand
jeromelachasse.bsky.social
5 ans après "Carbone et Silicium", c’est demain que sort le chef d’œuvre "Silent Jenny" de @mathieubablet.bsky.social. L’une des meilleures BD de l’année www.livreshebdo.fr/article/bd-b...
La couverture de Silent Jenny de Mathieu Bablet Une planche de Silent Jenny
October 14, 2025 at 2:55 PM
Reposted by Guillaume Bertrand
fabianschussler.bsky.social
🚀💥 Astro-COLIBRI v2.24.0 is now live!

This release is all about supernovae! We've added new filters, new notification streams, and a new figure. Plus, API enhancements, updated catalogs, an improved search for events, and many more. 🔭☄️🧪⚛️
Details in our forum post: tinyurl.com/2p2mncdu
🚀 Astro-COLIBRI v2.24.0 is Here! New Supernova Features & More!
Hello everyone, We’re excited to announce the release of Astro-COLIBRI version 2.24.0! This update brings a host of powerful new features, with a major focus on improving how you discover, filter, an...
forum.astro-colibri.science
September 30, 2025 at 7:39 AM
Reposted by Guillaume Bertrand
clairesecail.bsky.social
Ça risque d’être un peu juste pour la nomination d’un Premier ministre de gauche.
epsiloon.com Epsiloon @epsiloon.com · Oct 10
🧶 6/7
October 10, 2025 at 7:11 AM
Reposted by Guillaume Bertrand
sciencecqfd.bsky.social
[La Science, CQFD x4] ⚡Exoplanètes 🪐/ Vie utérine 👶/ Vitesse de la lumière⚡/ Jane Goodall 🐒 > tinyurl.com/2qelrrel les émissions de la semaine à (ré)écouter sur @franceculture.fr !
October 10, 2025 at 8:40 AM
Reposted by Guillaume Bertrand
alexandradelbot.bsky.social
Le prix Nobel de physique 2025 récompense Michel Devoret, John Clarke et John Martinis pour leur découverte de l’effet tunnel macroscopique : un phénomène quantique où des milliards d’électrons traversent une barrière infranchissable selon la physique classique.

Kezako ? Explications en Gif ⬇️
Le prix Nobel de physique 2025 récompense l’effet tunnel quantique à grande échelle
Le prix Nobel de physique 2025 récompense Michel Devoret, John Clarke et John Martinis pour leur découverte de l’effet tunnel macroscopique : un phénomène quantique où des milliards d’électrons traver...
www.radiofrance.fr
October 7, 2025 at 2:35 PM
Reposted by Guillaume Bertrand
guillaume.champeau.info
Devenu addict de cette appli que nous venons de lancer avec des collègues : refeed.news.

L'idée est de générer automatiquement des revues de presse personnalisées, pour respirer et capter l'essentiel au delà du brouhaha des réseaux sociaux. Essayez et dites moi !
September 24, 2025 at 7:19 AM
Reposted by Guillaume Bertrand
melix.champeau.me
JSol'Ex 4.1.0 est sorti, avec des améliorations ergonomiques pour la soumission BASS2000, des profils de sélection d'images, des "plugins de scripts" et un mode collage. Tout ça en vidéo ici: www.youtube.com/watch?v=njbD...

melix.github.io/astro4j/late...

#JSolEx #SolEx #solar
JSol'Ex 4.1.0 : définition de profils et collages photo
YouTube video by Cédric Champeau
www.youtube.com
September 24, 2025 at 6:35 PM
Reposted by Guillaume Bertrand
drnereide.bsky.social
🧵
A study, published in ApJ (July 2025), suggests that quasars, the extremely luminous active nuclei of galaxies, could signpost pairs of supermassive black holes, orbiting each other.

Video: NASA's Goddard Space Flight Center/Scott Noble; simulation data, d'Ascoli et al. 2018

🔭 🧪 #cosmology
September 19, 2025 at 7:41 PM
guillaumebertrand.bsky.social
Despite tough conditions (technical issues), I managed to capture a spectrum 🌈 of Nova Ser 2025 (V691 Ser) and do V-band photometry. #astronomy #astrophysics
July 25, 2025 at 4:29 PM
Reposted by Guillaume Bertrand
chrislintott.bsky.social
Betelgeuse is a double! Fun to learn something new about a familiar star.
July 21, 2025 at 7:09 PM
Reposted by Guillaume Bertrand
nebulaphotos.bsky.social
The Ring Nebula, now with Argon!
Very excited about this one which incorporates data taken with a new [Ar III] filter available for the QHY miniCAM8M system. More details are available on my astrobin: app.astrobin.com/i/jk9lev
#astrophotography #nebula
The Ring Nebula, Now with Argon! - AstroBin
This is my first experiment with the new [Ar III] (doubly ionized Argon) filter for the QHY miniCam8M. After this successful first attempt, I'm excited to try it on other nebulae. This was captured fr...
app.astrobin.com
July 18, 2025 at 6:59 PM
Reposted by Guillaume Bertrand
ericlagadec.bsky.social
Des astronomes viennent d'observer la naissance d'une étoile à 1300 années-lumière de nous!!

©ALMA(ESO/NAOJ/NRAO)/M. McClure et al.
Naissance d'une étoile avec des jets
July 16, 2025 at 3:17 PM
Reposted by Guillaume Bertrand
ligo.org
The LIGO Virgo KAGRA study of #GW231123 was posted to the arXiv today, and is free to read

arxiv.org/abs/2507.08219

Data are available from the GW Open Science Center

gwosc.org/eventapi/htm...

#OpenScience #OpenData ☄️
arXiv preprint GW231123: a Binary Black Hole Merger with Total Mass 190-265 M⊙ On 2023 November 23 the two LIGO observatories both detected GW231123, a gravitational-wave signal consistent with the merger of two black holes with masses 137+22−17M⊙ and 103+20−52M⊙ (90\% credible intervals), at luminosity distance 0.7-4.1 Gpc and redshift of 0.39+0.27−0.24, and a network signal-to-noise ratio of ∼22.5. Both black holes exhibit high spins, 0.9+0.10−0.19 and 0.80+0.20−0.51 respectively. A massive black hole remnant is supported by an independent ringdown analysis. Some properties of GW231123 are subject to large systematic uncertainties, as indicated by differences in inferred parameters between signal models. The primary black hole lies within or above the theorized mass gap where black holes between 60-130 M⊙ should be rare due to pair instability mechanisms, while the secondary spans the gap. The observation of GW231123 therefore suggests the formation of black holes from channels beyond standard stellar collapse, and that intermediate-mass black holes of mass ∼200 M⊙ form through gravitational-wave driven mergers. Figure 7 of the paper showing the inferred masses. The masses are measured to be high, but the exact values depend significantly depending on the waveform model used. These are the most significant systematic uncertainties we have seen so far. New detections are pushing the boundaries of our calculations. Figure 8 of the paper showing the inferred spins. Results again vary between waveform models, but they consistently show high spin magnitudes with some support for misalignment relative to the orbit of the binaries. Screenshot of from the Gravitational Wave Open Science Center showing spectrograms of the signal (which is short) as well as links to download the raw data.
July 14, 2025 at 4:18 PM
Reposted by Guillaume Bertrand
philplait.bsky.social
In 2023, astronomers detected a cosmic blast so powerful it released more energy than ALL THE STARS IN THE UNIVERSE COMBINED. The cause: two black holes colliding and merging… which is a problem, because they were way bigger than we thought possible.

badastronomy.beehiiv.com/p/the-bigges...

🧪🔭
The biggest black hole merger ever detected so far rocked the Universe
The gravitational waves they emitted were fiercely powerful, but where did the black holes come from?
badastronomy.beehiiv.com
July 14, 2025 at 2:49 PM
Reposted by Guillaume Bertrand
ericlagadec.bsky.social
Il y a 10 ans, la sonde New Horizons survolait Pluton, aux confins du système solaire, nous ramenant ces clichés exceptionnels.
Pluton Pluton Pluton
July 14, 2025 at 6:43 PM
guillaumebertrand.bsky.social
The #Sun in live with the small solar telescope #SUNSCAN and my iPad. H-alpha and Ca II H lines. #astronomy #astrophotography
July 12, 2025 at 9:19 AM