Happening *today* at 1pm! Data Products and Tools from the Project Infrastructure Teams (PITs) may be useful for you to utilize and build upon for your #NASARoman Cycle 1 proposals.
Happening Now!
🚨 Community Forum Reminder🚨
Join Roman Community Forum #22 for an overview of the Roman Research Nexus—connecting the community to tools, data & collaboration!
⭐ Jan 21, 2026 • 4–5 PM ET
🔗 bit.ly/49GUtXW
This pathfinder shows what’s possible right now with archival JWST data.
The early Universe is exploding—we’re finally watching. 💥
Paper link ⬇️
ui.adsabs.harvard.edu/abs/2026arXi...
#JWST #NASARoman #Supernova #COSMOS
n/n
And this is just the start.
📡 Roman will deliver cadence + area
🔭 JWST delivers depth + spectroscopy
Together: a complete picture of explosive transients in the early Universe.
11/n
🚀 Imagine a dedicated JWST time-domain survey:
• multiple epochs
• wide area
• planned cadence
We’d measure SN rates, test stellar evolution, and push SN Ia cosmology to z > 3.
10/n
Previous JWST transient work (e.g. JADES) went ultra-deep but narrow.
COSMOS-Web + PRIMER show the power of scale—5× the area, dozens of new SNe.
Different strategies, complementary science.
9/n
📊 These results show that area beats depth for high-z SN discovery.
Going fainter than ~28 mag helps less than going wider.
This has huge implications for how we design future JWST & Roman surveys.
8/n
The sample already hints at something exciting:
➡️ Wide-area JWST surveys preferentially find
🟦 younger
🟦 bluer
🟦 more extreme explosions
Exactly what we expect at high-z—but rarely see.
7/n
Even with just 1 epoch, combining:
• host photometric redshifts
• colors & magnitudes
• SN models
lets us probabilistically classify SNe and rank them for scarce JWST follow-up time.
6/n
Two highlights:
🔹 SN 2023aeab — a blue, Type IIP CCSN at z > 3
🔹 SN 2023aeax — a young, normal SN Ia at z > 2
Yes—a normal SNe Ia at cosmic noon and beyond.
5/n
💥 Result: 68 supernovae detected
📈 Host photo-z out to z ≲ 5
🧠 Single-epoch data, but enough info to classify & prioritize follow-up
This is the largest wide-area JWST SN sample to date.
4/n
So we asked: what can we already do with existing JWST data?
The trick: difference imaging between two massive JWST surveys
➡️ COSMOS-Web + PRIMER
➡️ ~1 year separation
➡️ 133 arcmin² overlap
Neither was designed for transients—but together, they are 👀💀
3/n
High-z transients are notoriously hard: rest-frame optical shifts to IR and ground-based surveys hit sensitivity limits.
JWST changes the game, but time-domain surveys are expensive and few have been TAC approved with the necessary sensitivity/wavelength coverage/cadence.
2/n
I'm excited to announce my newest paper out on arxiv: Expanding the High-z Supernova Frontier with JWST 🚀
We just used JWST to push transient astronomy to z ~ 5, discovering 68 supernovae...all without a dedicated time-domain survey.
Here’s what we found 👇🧵
1/n
It's been an exciting 2025. I haven't done a great job promoting my work on social media, so over the next couple weeks, I'll make an attempt to summarize three of my biggest papers. Stay tuned...we'll see if I actually get this done.
Roman Time Domain Session at 10am! #AAS247
As I have the past 3 years, I am organizing the a “Foodie Dinner” on Wednesday night, January 7th at 7pm. Location will be sent to those who sign up. At the current time, I have 3 spots left. PM if interested. #AAS247
Check them out #AAS247
🚀The Roman Cycle 1 Call for Proposals is OPEN!
Unlock new discoveries with the Wide Field Instrument—your science starts here! Apply for funding to analyze Roman data, perform theory/lab research, and propose new observations. 🔭☄️
📅 Deadline: Mar 17, 2026 (5 PM PDT)
📝 bit.ly/4q3jbbL
Got a look at @nasaromantelescope.bsky.social this morning. And it was looking right back.
🔭☄️
🚀The Roman Coronagraph Community Participation Program (CPP) is meeting this week at IPAC in Pasadena, CA!
The team is gearing up for commissioning, observations with the Coronagraph, and preparing for the launch of Roman next year. Exciting times ahead! ✨🪐
www.romancoronagraph.space
I don't post a lot, but I am particularly proud of this paper. It's the first observational sample of binary companions to stripped envelope supernovae. And places constraints on the binary evolution physics.
It only took me 10 years to build with HST!
arxiv.org/abs/2508.12677
In these turbulent times for science, I can't resist putting out my "Case For Space". It's sometimes a little scary to speak up, but here I go. I hope this doesn't go viral. 😉
🚨Get Ready for #AAS246!🚨
Follow us daily for your dose of #NASARoman at AAS: talks, posters, booths, sessions (and stickers) —we’ve got it all. 🔭📡📸
This just came out
🚀Want to get involved with #NASARoman before it launches? You can tune-in, interact, or actively contribute.
It's a great way to gear up for the Cycle 1 Call for Proposals coming in late 2025! 👩🚀🛰️
Find out more: bit.ly/4kigJM9
#ExpandOurView
