Ward Howard

Ward Howard

@wardhoward.bsky.social

Husband to Kate, father, follower of Jesus. NASA Sagan Fellow at CU Boulder in the department of Astrophysical & Planetary Sciences working on stellar flares, exoplanets, and extragalactic foregrounds. Website: https://www.wardshowardastronomer.com

342 followers293 following412 posts

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1/ It's press day!🔭🧪 We apply a grid of time-dependent physical models to explain TRAPPIST-1 flares, predicting the X-ray & UV flux driving escape and photochemistry in planetary atmospheres, and correcting flare contamination in transit spectroscopy down to ~60 ppm: www.colorado.edu/today/2025/1...

colorado.eduNew research on flares from a hot-tempered star could inform search for habitable planetsA new study takes a close look at TRAPPIST-1, a little star roughly 40 light-years from our sun that hosts seven Earth-sized planets.

Congratulations @mmacgreg.bsky.social — excited for some far-IR science coming down the pipeline 🔭

So excited to see even these first test images from the Wide Field Instrument knowing our surveys are only months away — go #NASARoman 🔭 💫

#NASARoman activated the Wide Field Instrument—a 300-megapixel infrared camera that will allow it to explore wide swaths of the cosmos quickly. This test image captures the very first photons of starlight to reach the instrument—taken as an initial performance assessment: https://go.nasa.gov/4rg4qEc

It was such a fun privilege getting to work with Jaime et al. exploring the roles of repeated flaring and flare temperatures in young terrestrial atmospheres!

Dr./Prof. Meredith MacGregor@mmacgreg.bsky.social

It's a big day for EVE papers on the arXiv! First up is a paper led by @jhuartssciences.bsky.social graduate student Jaime Crouse exploring the effect of flare temperature on ozone photochemistry in Earth-like atmospheres: arxiv.org/abs/2608.23548

Excited to be back on the Caltech campus this morning to share about infrared observations of stellar flares at the Shifting Landscapes in Astrophysics: New Frontiers to Explore with Roman” science conference! 🔭🧪 #Roman2026

Ward Howard reposted

To be clear, this isn’t an AI tool, it’s a form with prompts that breaks the process of composing a comment into smaller pieces with specific guidance on each piece on how to make it an effective comment. Useful!

🔭 AAS has partnered with @apsphysics.aps.org and other organizations to develop a tool to help you submit unique, personalized comments on harmful proposed changes to federal grants. Please submit a comment by 13 July! www.aps.org/initiatives/...

Important find! Will be seeing how this impacts our flare spectral extractions.

Shashank Dholakia@astroshashank.bsky.social

Thread on our new paper on arxiv today! We stumbled across a weird sinusoidal systematic that we think appears in every observation from the NIRISS instrument on JWST. We derive a correction and see how much it impacts exoplanet spectra. (1/N) #astro #exoplanets 🔭🧪 arxiv.org/abs/2606.11983

Excellent thread on multiple levels of absurdity impacting ECRs without citizenship. @gmduvvuri.bsky.social and others like him deserve better:

Girish M. Duvvuri@gmduvvuri.bsky.social

Fun fact: a number of long-term academic job postings last cycle (and some current off-cycle ones) flat out state(d) that they will not sponsor H1B visas for applicants because of the fee.

I am so excited to get started on wide field time domain astronomy in the near-infrared. Just like TESS did in the optical, we’ll launch to find planets in the bulge and learn so much about stellar astrophysics along the way 🪐🔭💫

Space projects running ahead of schedule? This is rare! Huge celebratory high-5's all round to the Nancy Grace Roman Space Telescope team, due for early launch this August 🥳 This beast will discover >100,000 planets orbiting distant stars and so so much more 🤩🧪🔭🛰️ ℹ️: science.nasa.gov/blogs/roman/...

The link was somehow corrupted. The correct link is docs.google.com/forms/d/e/1F...

docs.google.comdocs.google.com
Ward Howard@wardhoward.bsky.social

🚨🚨🚨 Now accepting 2026/2027 applications🔭 🪐🚨🚨🚨 AMP-UP provides mentorship to senior grad students/postdocs: docs.google.com/forms/d/e/1F... Please forward to anyone who might be interested/share with institution listservs. The application deadline is *June 26*. -On behalf of the 2026 AMP-UP leads

Ward Howard reposted

Ward Howard reposted

The final version of our Dawes Review on the Dynamic Radio Sky is now published! doi.org/10.1017/pasa... Everything you need to know about what causes radio transients: how we detect them, the history of radio transient surveys, and what new widefield radio telescopes will do. #RadioAstronomy 🔭☄️🧪

Ward Howard reposted

Replying to @galaxymap.bsky.social

Two things have happened: the community hasn't reassembled to the same degree here, and that lots of astro groups are now internally using Slack and Discord for discussions instead of social media. That's pretty much killed it off, IMHO.

1/ It's press day!🔭🧪 We apply a grid of time-dependent physical models to explain TRAPPIST-1 flares, predicting the X-ray & UV flux driving escape and photochemistry in planetary atmospheres, and correcting flare contamination in transit spectroscopy down to ~60 ppm: www.colorado.edu/today/2025/1...

colorado.eduNew research on flares from a hot-tempered star could inform search for habitable planetsA new study takes a close look at TRAPPIST-1, a little star roughly 40 light-years from our sun that hosts seven Earth-sized planets.
View full thread

8/ We also use our flare spectral models to correct the flare-contaminated observations to levels comparable to the expected signals of secondary planetary atmospheres using a RADYN-based and more empirical pipeline, both of which retrieve ~130 ppm injected CO2 atmospheres with a Bayes Factor of 3.

1/ It's press day!🔭🧪 We apply a grid of time-dependent physical models to explain TRAPPIST-1 flares, predicting the X-ray & UV flux driving escape and photochemistry in planetary atmospheres, and correcting flare contamination in transit spectroscopy down to ~60 ppm: www.colorado.edu/today/2025/1...

colorado.eduNew research on flares from a hot-tempered star could inform search for habitable planetsA new study takes a close look at TRAPPIST-1, a little star roughly 40 light-years from our sun that hosts seven Earth-sized planets.
View full thread

6/ Excitingly, the electron beams identified by separate grid searches on the NIRISS flare lines and continuum largely agree, providing evidence for only moderate-intensity electron beams of 10^12 erg/s/cm^2 and low electron energies of 20-40 keV. This may help explain the cooler flare temperatures!

7/ Since the same beams producing JWST flares also cause X-ray/UV emission important to understanding planetary atmospheres, we make testable predictions for future multiwavelength observations. If true, these predictions give flare impacts for 260 hours of archival JWST data lacking joint X-ray/UV!

1/ It's press day!🔭🧪 We apply a grid of time-dependent physical models to explain TRAPPIST-1 flares, predicting the X-ray & UV flux driving escape and photochemistry in planetary atmospheres, and correcting flare contamination in transit spectroscopy down to ~60 ppm: www.colorado.edu/today/2025/1...

colorado.eduNew research on flares from a hot-tempered star could inform search for habitable planetsA new study takes a close look at TRAPPIST-1, a little star roughly 40 light-years from our sun that hosts seven Earth-sized planets.
View full thread

4/ Flares occur when magnetic fields accelerate beams of electrons down into the stellar atmosphere, heating the plasma. RADYN is unique in its ability to model this electron beam heating. Until now, RADYN models have been unable to reproduce the low flare temperatures of the TRAPPIST flare spectra:

1/ It's press day!🔭🧪 We apply a grid of time-dependent physical models to explain TRAPPIST-1 flares, predicting the X-ray & UV flux driving escape and photochemistry in planetary atmospheres, and correcting flare contamination in transit spectroscopy down to ~60 ppm: www.colorado.edu/today/2025/1...

colorado.eduNew research on flares from a hot-tempered star could inform search for habitable planetsA new study takes a close look at TRAPPIST-1, a little star roughly 40 light-years from our sun that hosts seven Earth-sized planets.

2/ Our results, published in ApJ Letters just prior to the holidays, rely on 5.5 hours of mostly NIRISS observations obtained during six large "X-class" flares from TRAPPIST-1 observed as part of GO 2589 (PI: Lim) and GTO 1201 (Lafrenière). Flare temperatures during these times are highlighted:

Ward Howard reposted

The GRFP announcement from NSF cuts out an entire cohort of 2nd year students from consideration, without warning. This is so deeply unfair that it warrants a formal protest from the scientific community. If someone wants to work with me to craft an open letter and solicit signatures, LMK.

Dan Garisto@dangaristo.bsky.social

New: After a long wait, the GRFP solicitation is live! Deadlines have been extended to early November, so applicants have a bit over a month to submit. www.nsf.gov/funding/oppo...

Great breakdown of the new T1e results:

Dr Ryan MacDonald@distantworlds.space

We observed the habitable zone planet TRAPPIST-1e with JWST to search for an atmosphere. You've seen the headlines, now let's dive into the science! 🧪 THREAD (1/N) #Exoplanets 🔭

Ward Howard reposted

Is the interstellar object 3I/ATLAS alien technology? No, but it is an exciting addition to the population of exocomets that come to us, enabling a better understanding of these objects usually observed from afar. We should focus our efforts on what these objects really are, not what they aren't.

Ward Howard reposted

Here once again for all your exoplanet host star emission spectrum needs.

HLSP Update: Mega-MUSCLES' SEDs for a dozen of stars are now updated with DEM models for the Extreme Ultraviolet and provide model uncertainties. More details in Wilson et al. 2025:https://arxiv.org/abs/2411.07394 or ask @astrodave2.bsky.social. HLSP page: archive.stsci.edu/hlsp/muscles 🔭