Germán Chaparro

Thank you @saintgermain.bsky.social for the nice and comprehensive summary of our new paper! I'm so happy this nice work is finally out 😊✨

Check out our paper "Pattern finding in millimetre-wave spectra of massive young stellar objects" to explore the full story! Feel free to ask questions or share your thoughts aanda.org/articles/aa/...

Our approach is a robust, automated alternative to traditional rotational diagram fitting. This method is able to accelerate spectral analysis and yield physical and chemical information about MYSO evolution.

By training a simple random forest on the first few PCA components (as proof of concept), we demonstrated that you can directly derive the physicochemical state of a MYSO from its spectra. This streamlines spectral analysis and minimizes manual intervention.

Using a Gaussian mixture model in our reduced (embedded) parameter space, we identified these clusters. Principal component analysis (PCA) further supported an evolutionary pathway across the groups.

Our new analysis revealed three distinct MYSO populations:
(i) Cold, COM-poor sources
(ii) Warm, medium-COM-abundance sources
(iii) Hot, COM-rich sources
These groups hint at different evolutionary stages in massive star formation.

Their spectral line information showed that not all MYSOs share the same physico-chemical states. This points to plausible evolutionary pathways for MYSOs

They found several amazing complex organic molecules (COMs) like methanol, methyl acetylene, and methyl cyanide in these massive star forming regions

Using ALMA Band 6 data, we analyzed mm-wave spectra from 41 massive young stellar objects (MYSOs) sourced from diverse catalogs (N. Frimpong's PhD work).

We used dimensionality reduction techniques like Locally Linear Embedding (LLE) and Principal Component Analysis (PCA) to uncover hidden patterns in the spectra. This means we can get key physicochemical info without the manual hassle.

Traditionally, we manually extract spectral lines and fit them to build these diagrams. This is a process that’s usually time-consuming since each spectral line needs its own separate profile fit

Quick refresher: a rotational diagram plots the log-column density (divided by statistical weight) against the energy of a molecule’s rotational levels. This lets us infer the excitation temp. & column density of a chemical species. This is very helpful in star formation studies.

This is the amazing work of Yenifer Angarita @yangarita.bsky.social (UdeA 🇨🇴 graduate), whom I co-supervised while she was an MPhil student at Leeds Uni.🇬🇧. Coindicentally, she just finished her PhD at Radboud Uni. 🇳🇱 and is currently a Postdoc at Chalmers Uni. 🇸🇪. Ok now the paper ->

🚀 New Paper Alert! 🚀
We're excited to share our latest work at UdeA, recently published in Astronomy & Astrophysics. We show how machine learning can cut down the manual workload in rotational diagram analysis, directly decoding mm-wave spectra! 🧵 #Astronomy

Voy a ser parte de la 11 expedicion antartica colombiana. Estare actualizando por aqui o en www.tiktok.com/@germanchapa...

NASA's Commitment to Diversity and Inclusion section has been removed from the Human Exploration Research Opportunities (HERO) program funding notice

Bluesky’s science takeover: 70% of Nature poll respondents use platform Roughly 6,000 readers answered our poll, with many declaring that Bluesky was nicer, kinder and less antagonistic to science than X.

Roughly 6,000 readers answered our poll, with many declaring that Bluesky was nicer, kinder and less antagonistic to science than X

https://go.nature.com/42tH8Ai

NASA AM/PM

Paila, ya me congelé

I'll be flying out to Antarctica in two weeks to do some radio astronomy EoR sciencey stuff. Here's my final 3-to-4-layer outfit test before packing.

Congratulations to my former MPhil student Yenifer Angarita (now postdoc at Chalmers) and co-authors on this wonderful Boxing day paper acceptance! #paperday #itsthemostwonderfultimeoftheyear

Reductio ad etymologia

First Ciclovia in Bogotá, then called La gran manifestación del Pedal Picture by Jaime Ortiz, one of its promoters Dec 15, 1974

Ciclovía Bogotá, Dec 15 2024 Photo D. Hidalgo

Bogotá 🇨🇴 celebrates 50 years of Ciclovía
December 15 1974 - 2024
The largest open-streets program in the world 🙋‍♀️🚴🏻‍♀️
Currently 127 km
70 times per year
1.5 million people every Sunday and holiday (e)
#Ciclovía50años

On the Use of Letters of Recommendation in Astronomy and Astrophysics Graduate Admissions Letters of recommendation are a common tool used in graduate admissions. Most admissions systems require three letters for each applicant, burdening both letter writers and admissions committees with ...

Very useful ideas in this open letter to the AAS: current system w/ 2-3 letter per applicant is inefficient: rather move to research highlights portfolios in centralized astro system + 1 letter per applicant arxiv.org/abs/2412.08715

🚨Actualizado #CientificosLatam🚨

Con colegas de Argentina 🇦🇷 México 🇲🇽 Colombia🇨🇴 Perú 🇵🇪 Brazil 🇧🇷

Perdón que sólo hace poco activé las notificaciones y noté las solicitudes de inclusión en la lista.

Muchas gracias @lorenagbarberia.bsky.social
por todas las sugerencias!

go.bsky.app/2oEhFSh

Tres estudiantes del pregrado de Astronomia-UdeA fueron premiados por sus pósteres en la séptima edición del Congreso Colombiano de Astronomía y Astrofísica, celebrado en Bucaramanga tinyurl.com/29fytn3s

Igual Holanda,por eso tantas empresas tienen hq alla

Cambio de e-reader? O renunció a esos aparatos por completo?

Horrible, casi siempre son cosas super obvias. Como que lo creen pendejo a uno.

Lecturas de la semana