Caitlin Casey Profile picture
Prof at @UTAustin, Astronomer ✨, mom of three 👶🏻👶🏻👶🏻💕. Eclectic collection of pets 🐷🐔😻. Big fan of justice & Earth 🌎, lots of typos 🤷🏼‍♀️. she/her
Aug 23, 2023 17 tweets 5 min read
JWST has now found 100s of new galaxies at z>8 ✨, <650 million years after the Big Bang. But nearly all of them are pretty faint.

In COSMOS-Web, we found some VERY bright 10<z<14 candidates we’re excited to share. New paper out today 🧵⬇️
arxiv.org/abs/2308.10932 Short version:
* 15 z>10 candidates with MUV ~<-21 across 0.28sq deg, 12 of them robust (lots of tests, etc.)
* derived masses are HIGH.  Some as high as 10^(9.5-10)Mstar at z~12.
* Those masses don’t break ΛCDM, but are also very challenging to build
...
Jan 18, 2022 51 tweets 29 min read
Are you an astronomy undergrad interested in a summer research gig?! This long 🧵 listing programs is for you. Spread the word!

Deadlines cluster around Jan 31-Feb 15, so NOW is the time to apply for summer 2022. I’m going to frontload this thread with information about summer resesarch programs that are NOT official NSF REU programs (I’ll add REUs at the end). Non-REUs are equivalent in prestige; they just have a different funding stream and will provide just as great of an experience.
Jan 14, 2020 38 tweets 33 min read
Are you an astronomy undergrad looking for a summer research opportunity? Or do you advise them? Please spread this thread / list of summer astronomy research programs far and wide! Deadlines cluster around Jan 31-Feb 14, so NOW is the time to apply. A lot of programs based in the US have citizenship or permanent residency requirements. I’ve marked those with **US only** and programs that require that students are enrolled as ugrads through summer 2020 with **no post-bacs**.
Jul 22, 2019 56 tweets 20 min read
HOLY COW FOLKS, I am so excited to tell you the play-by-play of my first flight on @SOFIAtelescope and how FREAKIN COOL it was: @SOFIAtelescope (telescope on airplane) is currently flying out of Christchurch, New Zealand for its “southern deployment.” It usually flies out of Palmdale, CA. They come down here to optimize time during northern hemisphere summer/Southern Hemisphere winter (long, cool nights).
Jan 8, 2019 23 tweets 9 min read
Thank you all for your love, support and comments about my plenary talk on the Obscured Early Universe yesterday at #AAS233. It's impossible to divorce identity and experiences from science, and I wanted to convey that ever-present feeling while sharing my science with you. I included personal anecdotes of my experiences at the bottom of my slides to demonstrate how distracting it can be to live with harassment and bullying while striving to make real scientific impact. I'll copy each of those statements here for those who missed it. #AAS233