Jiayi Sun
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astrojysun.bsky.social
Jiayi Sun
@astrojysun.bsky.social
Astronomer @ Princeton University (NASA Hubble Fellow) | 孙嘉懿 | he/him | https://astrojysun.github.io
It's quite an honor to be the 2025 champion of the Princeton Astro Ping Pong Tournament, 70 years after the commencement of this event!
May 1, 2025 at 12:46 AM
In case anyone has not seen this petition but wants to sign it in support of the NIST Atomic Spectroscopy Group: chng.it/VcGHJGt2y8
Have you seen this petition yet?
Oppose the layoff of the NIST Atomic Spectroscopy Group
chng.it
March 28, 2025 at 6:42 PM
Reposted by Jiayi Sun
January 13, 2025 at 8:37 PM
Reposted by Jiayi Sun
The skies above Paranal are at risk from a proposed industrial megaproject. 

This would be located in the vicinity of ESO's Observatory. If constructed, it would irreparably impact astronomical observations.

Read more: https://www.eso.org/public/news/eso2501/
🔭 

📷 ESO/P. Horálek
World's darkest and clearest skies at risk from industrial megaproject
On December 24th, AES Andes, a subsidiary of the US power company AES Corporation, submitted a project for a massive industrial complex for environmental impact assessment. This complex threatens the pristine skies above ESO’s Paranal Observatory in Chile’s Atacama Desert, the darkest and clearest of any astronomical observatory in the world [1]. The industrial megaproject is planned to be located just 5 to 11 kilometres from telescopes at Paranal, which would cause irreparable damage to astronomical observations, in particular due to light pollution emitted throughout the project’s operational life. Relocating the complex would save one of Earth's last truly pristine dark skies.
www.eso.org
January 10, 2025 at 8:00 AM
Reposted by Jiayi Sun
JWST observed NGC 3351 two days ago.
This one was processed by @yuvharpaz.bsky.social
nerdculture.de/@yuvharpaz/1...
🔭 🧪
December 14, 2024 at 9:10 PM
Reposted by Jiayi Sun
#NASAWebb’s Mid-Infrared Instrument reveals that galaxy NGC 1433 contains dust and bubbles of gas throughout its spiral arms. Despite that, the galaxy has a low amount of dust and brightness, which hints at a recent collision with another galaxy: bit.ly/3ZXX4cN 🔭 🧪
November 22, 2024 at 5:35 PM
Reposted by Jiayi Sun
The work to defend the rights of women and immigrants and trans people, to preserve basic democratic and economic and international institutions, and to protect our planet - all just became immeasurably harder and more exhausting. Still very much worth it, though. Let's keep going.
November 6, 2024 at 12:04 PM
Reposted by Jiayi Sun
Temperature Scales xkcd.com/3001
October 22, 2024 at 12:17 AM
For anyone looking for astro postdoc positions this year: the NHFP application feedback program is back! We have a group of current/former postdoc fellows volunteering to provide unofficial feedback to your application material on a best-effort basis.

Applicant sign-up: forms.gle/SrfZVNjniZQP...

🔭
NHFP Application Feedback Information 2024
Thank you for your interest in this year's NASA Hubble Fellowship Program (NHFP) Application Feedback Program! We will send you an email to ask for your application materials once we receive this form...
forms.gle
October 3, 2024 at 8:01 PM
Check out those amazing MeerKAT HI data in @astrocosi.bsky.social's paper! We are really in a new era of high-resolution HI study
🆕✨My latest paper is on arXiv! We study the molecular gas ratio and how it depends on local conditions in nearby galaxy disks using multi-wavelength observations. New and astonishing MeerKAT HI observations from the PHANGS and MHONGOOSE collaborations #astronomy 🔭
🔍 arxiv.org/abs/2407.01716
PHANGS-MeerKAT and MHONGOOSE HI observations of nearby spiral...
The molecular-to-atomic gas ratio is crucial to the evolution of the interstellar medium in galaxies. We investigate the balance between the atomic ($Σ_{\rm HI}$) and molecular gas...
arxiv.org
July 9, 2024 at 5:13 PM
Reposted by Jiayi Sun
Types of Eclipse Photo xkcd.com/2917
April 9, 2024 at 12:17 PM
Reposted by Jiayi Sun
“Save Chandra” website now up with explanation of the budgetary threat to this Great Observatory, some necessary corrections regarding current mission capabilities and operating costs, and - most important - ways that you can help. 🧪 🔭 🛰️ Spread widely!
Act Now | Save the Chandra X-ray Observatory
Ask that Congress #SaveChandra! | The Chandra X-ray Observatory, one of NASA's last Great Observatories, has revolutionized our understanding of the Universe, mapped black holes across cosmic time, ...
www.savechandra.org
March 16, 2024 at 5:21 PM
Reposted by Jiayi Sun
We are live! 🔭
✨ PHANGS-JWST infrared imaging of 19 nearby galaxies
✨ ~100,000 PHANGS-HST star clusters and associations across 38 nearby galaxies
👉 data release archive.stsci.edu/hlsp/phangs
👉 press and image release webbtelescope.org/contents/new...
January 29, 2024 at 3:48 PM
And we have a PHANGS-JWST press release this morning! The images are ABSOLUTELY worth checking out...

webbtelescope.org/contents/new...
January 30, 2024 at 4:42 AM
🔭 Paper day! If you'd like to know what matched-resolution ALMA+HST+JWST data can tell us about "infant" massive clusters and their birth timeline, check out my latest paper on arXiv: arxiv.org/abs/2401.14453

And now I've earned the right to officially claim M95 (NGC3351) as my favorite galaxy! 😁
January 29, 2024 at 3:30 AM
Reposted by Jiayi Sun
“Disorientation” by @astrokatie.com makes me realise I should have more science poetry in my life. A compressed epic that flings you across the vast expanse of time and space. Pleased to see there’s an audio version read by Mack, as well as the written piece.

#Science #Poetry #Astronomy
Disorientation: A Science Poem by Katie Mack
Astrophysicist Katie Mack encourages us to "see [our] world from four billion miles away" in this poem, presented in text and video formats.
sciences.ncsu.edu
January 11, 2024 at 10:58 PM
Reposted by Jiayi Sun
My first paper is out now on the arXiv (arxiv.org/abs/2401.01737) and through advance access on MNRAS (academic.oup.com/mnras/advanc... )
I investigate the conditions needed to form filaments in the cold neutral medium through a periodic turbulent box simulation.
Necessary conditions for the formation of filaments and star...
Star formation takes place in filamentary molecular clouds which arise by physical processes that take place in the cold, neutral medium (CNM). We address the necessary conditions for this diffuse...
arxiv.org
January 4, 2024 at 4:14 PM
Reposted by Jiayi Sun
1/ Using IRAM's NOEMA interfrometer, MPIA's Sophia Stuber and Eva Schinnerer have mapped the stellar nurseries of cold, dense gas in the Whirlpool Galaxy. They found interesting differences in the chemical probes they used. 🔭
www.mpia.de/news/science...
The birthplaces of stars in the Whirlpool Galaxy
For the first time, signatures of individual cold and dense star-forming clouds in a galaxy outside the Milky Way have been mapped over a wide area.
www.mpia.de
December 21, 2023 at 10:50 AM
Reposted by Jiayi Sun
OK this is the mind-blowing image of the week for me: the total global biomass of mammals.

Wild animals are a tiny proportion.

From a paper by Ron Milo Lab at Weizmann Institute, via a great Oxford lecture by @marionkoopmans.bsky.social

www.pnas.org/doi/10.1073/...
November 10, 2023 at 5:30 PM
Reposted by Jiayi Sun
🧪🔭 #MilkyWay23 Jiayi Sun starting to put MW in context
October 27, 2023 at 9:17 PM
Reposted by Jiayi Sun
October 15, 2023 at 7:47 PM
Reposted by Jiayi Sun
I just set up an automated way to send out invite codes to astro folk who request them 😁 I think I can send out about 100/day. 🔭

Donate any codes you have here: forms.gle/R35p4MRSwpk2...

& please share this code request form with other astro folks: forms.gle/GggKAPv8Vcrv...
October 7, 2023 at 4:35 PM
Reposted by Jiayi Sun
#apod 2023-10-07
The Once and Future Stars of Andromeda
Web page: https://apod.nasa.gov/apod/ap231007.html
October 7, 2023 at 6:30 AM
Reposted by Jiayi Sun
It is incredible what academia put Karikó through, and how she persevered.
October 4, 2023 at 11:12 AM
Reposted by Jiayi Sun
We're hiring @CarnegieAstro this year! If you're on the #astronomy job market, consider joining us! #academicbsky #academicjobs #academicchatter
@CarnegieAstro is searching broadly for new staff scientists. From exoplanets to the most distant galaxies and everything in between, our scientists study it all. Apply to join our Staff: obs.carnegiescience.edu/staff-astron... 🔭
September 26, 2023 at 10:14 PM