New theory suggesting that faster rotating stars make more high energy flares! New preprint arxiv.org/abs/2201.03697 with , Mark Krumholz, Christoph Federrath, Fred Adams, and Marco Fatuzzo.
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Darryl Zachary Seligman
@DarrylSeligman
Postdoc at Cornell Astro
Darryl Zachary Seligman’s Tweets
1/ Cao, Pinsonneault, & van Saders (2023) arxiv.org/abs/2301.07716: If stars experience an effect called core-envelope decoupling---where their envelopes spin down independently of their cores for a time, strong radial shears may drive an alternative dynamo mode. (Submitted, ApJL)
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Super happy with this recognition of Dragonfly!
news.yale.edu/2023/01/13/yal
Lots of thanks to our awesome team - including Allison Merritt, , , , Colleen Gilhuly, , Seery Chen, , , and Will Bowman!
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How do extrasolar super-Earths form? In our new paper with Morby, we propose that they originate in massive narrow rings of planetesimals. Check it out:
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An absolutely fantastic dissertation talk by ! Adina has really done an amazing job characterising stellar flares and exoplanet atmospheres (along with lots of other cool stuff!) #AAS241
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Detroit linebackers came to play
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A talented undergraduate I work with, Drew Weisserman (), has just had this first paper accepted to AJ! Drew is applying to PhD programs this fall. His paper is now on arxiv here:
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jwst ers transmission spectra of wasp-39b, lead by myself & Zafar Rustamkulov (in order from top left to bottom right) along with the 100s of scientists on the ers team
it's so f*cking cool to see them out in the wild now 🖤
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I truly was not expecting to see such a spectacle this evening, and I'm so glad we did. Here's what this mega-rocket launch means:
scientificamerican.com/article/artemi
TY x 10^6 to and for working with me on this story, and for giving me the opportunity to be here!
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Impact ❤️
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Jalen Hurts had a large cheering section eagerly waiting for him after practice #SeniorBowl
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Man Wouldn't Have Worn Costume To Work If He'd Known He Was Getting Laid Off bit.ly/3DcwVdf
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Jason Kelce, Jordan Mailata, and Lane Johnson are dropping a Christmas album “A Philly Special Christmas” on 12/23, with covers of all of your favorite Holiday classics.
phillyspecialchristmas.com
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So, we have another active asteroid...
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This big study has been reuploaded to arXiv with a new title, and whole new section “The density distribution and physical origins of intermittency in supersonic, highly magnetised turbulence _with diverse modes of driving_”:
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Great summary from about interstellar comet analogues polluting exoplanet atmospheres currently being observed by #JWST with
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When Planets Collect Comets
Planets might ensnare comets that pass too close. Which planets are the likeliest comet catchers, and what would this mean for our interpretations of exoplanet composition? aasnova.org/2022/07/20/whe @GeoSci_UChicago @Caltech @UmichPhysics @michiganastro
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We measured the colors of 18 luminous globular clusters in the "galaxies without dark matter" DF2 and DF4, and find that they are essentially identical! The scatter is about 1%, and this can be explained by stochastic variation in the number of giants.
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Check out our poster for #coolstars21 with , , , and about stellar flares and rotation rates! Paper is here iopscience.iop.org/article/10.384
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Very excited to present Minerva🦉: a language model capable of solving mathematical questions using step-by-step natural language reasoning.
Combining scale, data and others dramatically improves performance on the STEM benchmarks MATH and MMLU-STEM. goo.gle/3yGpTN7
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Getting diagnosed with ADHD as an adult feels like being told you suck at Mario Kart your whole life and then finding out your game generates 40 times more banana peels than it's supposed to
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After a rather difficult & sometimes painful job search I'm excited to share that I'll be joining this fall! I will be working on range of interdisciplinary ML projects focused on what is measurable, how do we understand & trust measurements 1/
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Sam Hadden & I have a new Python package for celestial mechanics. It allows you to check, e.g., how much mean motion resonances matter vs long-term secular evolution by letting you evaluate and turn these terms on & off individually (+ much more!)
arxiv.org/abs/2205.10385
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stars w/ smaller Rossby #'s (shorter rotational periods) could have more high energy flares
why?
stronger rotational forces can drive directionally preferential field line braiding leading to longer braids with more energy to release during reconnection
arxiv.org/abs/2201.03697
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Some team gonna get an absolute steal in Nakobe Dean
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Gravitoturblence in spiral structure causing dust concentration arxiv.org/abs/2204.13310
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Multifluid 3D simulations of low mass embedded planet show that planet envelope can have a transition between optically thin and thick regimes that may limit the applicability of 1D models.
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RIP D Haskins, truly tragic
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Postdoc life:
Poorer than the professors, less cool than the grad students
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Take a look - 's (who just joined twitter) FIRST paper is on arXiv!! In this paper, she explores how misaligned protoplanetary disks can cross secular resonances as they disperse, creating large eventual stellar obliquities! arxiv.org/abs/2203.04429
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thanks for the shout-out 🙏🏻 check out our sweet new flare work below --
observational paper: ui.adsabs.harvard.edu/abs/2022ApJ...
theoretical follow-up lead by : ui.adsabs.harvard.edu/abs/2022arXiv2
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NEW PAPER! Feinstein et al. identified ∼10^6 flaring events on ∼10^5 stars observed by @NASA_TESS and found that all main sequence stars exhibit distributions of flaring events similar to the Sun's, independent of their mass or age. #NExSS ui.adsabs.harvard.edu/abs/2022arXiv2
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Thanks , and for a huge effort from and the rest of the co -authors!
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NEW PAPER! Feinstein et al. identified ∼10^6 flaring events on ∼10^5 stars observed by @NASA_TESS and found that all main sequence stars exhibit distributions of flaring events similar to the Sun's, independent of their mass or age. #NExSS ui.adsabs.harvard.edu/abs/2022arXiv2
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Did a photoshop of the Bucs next QB
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