Kevin Hardegree-Ullman

Brittany Miles @bemiles.bsky.social [ View ] Jul 08, 2024 at 04:40 UTC

arxiv.org/abs/2407.03620

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Jul 08, 2024 at 04:24 UTC

This is such a great paper! ui.adsabs.harvard.edu/abs/2022AJ.....

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Jul 08, 2024 at 04:00 UTC

It's the Where's Waldo/Wally of Exoplanets! 🔭🪐 www.halcyonmaps.com#/the-exoplan...

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Jul 06, 2024 at 01:13 UTC

And the 4th ever captured transit of K2-138 g! 🥲

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Jun 29, 2024 at 14:06 UTC

This person opened up a tanning salon with colored UV lamps, calls it an "experience under alien suns," makes $$. 🙄 If it was a true alien sun experience, it would take forever to get enough UV radiation from an M star, though a violent flare might zap you first. 🔭 www.space.com/stellar-tann...

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Jun 13, 2024 at 19:48 UTC

I HIGHLY recommend astronomy grad students apply to this wonderful program! Feel free to ask me anything about the program, my experience, etc.! 🔭🧪

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Jun 12, 2024 at 15:39 UTC

There's also an astronomer-led effort to get the Magellanic Clouds and Telescopes renamed: physics.aps.org/articles/v16...

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Jun 05, 2024 at 21:16 UTC

I have, however, had issues because I very rarely use Windows. So, sometimes you get an enormous backlog of Windows updates, or the VM software needs updates and there are issues booting the Windows VM. So I've had some mixed success, but overall the VM is still best for my needs.

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Jun 05, 2024 at 21:13 UTC

A VM usually works for most programs. I use VirtualBox, but make sure to install Guest Additions for better system driver integration. You might sometimes have driver issues. I haven't fully tested out things like graphics or audio intensive applications, but I encourage trying it out!

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Jun 05, 2024 at 15:42 UTC

I went from Windows+Cygwin to Windows+Ubuntu Virtual Machine to dual boot Windows+Ubuntu to Ubuntu+Windows VM. Since I don't really need full processor/memory for any Windows task, it made sense to run it as a VM. I almost never use Windows anymore, so I usually borrow a machine if needed.

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 31, 2024 at 15:20 UTC

Great article! I noticed a small typo: "In a report released in October 2022, the American Astronomical Society (ASS)" 😬

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:42 UTC

Can we probe O₂ on Earth-analogs with upcoming 25-40-meter class ground-based telescopes? We used Bioverse to look into the direct imaging and high-resolution spectroscopy capabilities of these telescopes!

Check out our new paper! arxiv.org/abs/2405.11423

🔭🪐🧪

1 replies 1 reposts 4 likes

Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:53 UTC

This work was made possible by the NASA/ICAR "Alien Earths" project (alienearths.space) and with great assistance from Daniel Apai, Sebastiaan Haffert, Martin Schlecker, Markus Kasper, Jens Kammerer, and Kevin Wagner!

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:52 UTC

For many more details and plots, including simulations for super-Earths up to 1.8 R⊕, please check out our paper!

arxiv.org/abs/2405.11423

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:50 UTC

The Astro2020 Decadal Survey identified the US-ELT Program as the highest priority in ground-based astronomy and our Bioverse study provides a scientific capability assessment in the priority area of Pathways to Habitable Worlds.

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:50 UTC

We did not assess the capabilities of the Thirty Meter Telescope (TMT), but a northern hemisphere telescope would expand the target pool by 25%, reduce time for biosignature detections, and provide important independent checks on potential biosignature detections.

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:49 UTC

Testing this hypothesis requires ~1/3 to 1/2 of the surveyed planets to have O₂ depending on the value of eta-Earth (fraction of habitable zone Earth-sized planets).

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:48 UTC

With Bioverse, we also assessed the ability of the ELT to test the habitable zone oxygen hypothesis -- that habitable zone Earth-sized planets are more likely to have O₂ -- within a 10 year survey.

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:48 UTC

Next, we looked specifically at 6 currently known super-Earth candidates, including Proxima Centauri b. The ELT could probe Earth-like O₂ concentrations on 4 of these planets in about a week of observing, and the GMT within a few months (these are median simulation results).

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:47 UTC

We found that up to ~5 and ~15 habitable zone Earth-sized planets could be probed for Earth-like O₂ concentrations by the GMT and ELT, respectively, in a 10-year survey.

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:46 UTC

In our realistic survey simulation of hypothetical planets orbiting nearby stars, we accounted for planet occurrence rates, ground-based observing constraints, simulated planet phase and orbit information, and new performance models of GMagAO-X (GMT) and PCS (ELT).

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:45 UTC

We used Bioverse (github.com/danielapai/b...), a framework to assess the statistical power of future exoplanet surveys on ground and space-based telescopes.

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:45 UTC

This time, we looked into high-contrast imaging with high-resolution reflected-light spectroscopy capabilities of the Giant Magellan Telescope (GMT) and the European Southern Observatory Extremely Large Telescope (ELT).

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:43 UTC

Last year, we looked into the transmission spectroscopy capabilities of large-aperture ground-based telescopes. TLDR; it will take ~a century to probe Earth-like O₂ levels on one planet with the combined power of 3 enormous telescopes. See paper here: ui.adsabs.harvard.edu/abs/2023AJ.....

1 replies 0 reposts 2 likes

Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 21, 2024 at 02:42 UTC

Can we probe O₂ on Earth-analogs with upcoming 25-40-meter class ground-based telescopes? We used Bioverse to look into the direct imaging and high-resolution spectroscopy capabilities of these telescopes!

Check out our new paper! arxiv.org/abs/2405.11423

🔭🪐🧪

1 replies 1 reposts 4 likes

Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 16, 2024 at 02:17 UTC

Dear Paw Patrol, This is not how telescope domes work. The telescope sticking out of the opening defeats the entire purpose of the dome. Please stop perpetuating misinformation to your young audience. Sincerely, A concerned astronomer with a toddler P.S. Cool rocket, though! 🐶🔭🚀

1 replies 2 reposts 21 likes

Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 08, 2024 at 23:59 UTC

I was a grad student for 5 years, 10 months, and 5 days. I just calculated, I've now been a postdoc for longer than I was a grad student: 5 years, 10 months, and 13 days. 😵‍💫

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] May 07, 2024 at 12:03 UTC

#AbSciCon24 Come check out the "Oxygen: Life, Biosignatures, and Beyond I" session between 10 and 11:30 am in Ballroom A. My talk, "Bioverse and the Prospects for Observing Biosignatures with Extremely Large Telescopes," including some exciting new results, is at 11:03 am! 🔭

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Apr 26, 2024 at 00:17 UTC

Apparently, I had the same eye surgery as my great great great great grand advisor. His surgery, however, left him blind in one eye. Luckily, ~100 years was enough time to improve the procedure. 🔭👀

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Apr 08, 2024 at 21:04 UTC

Here's a much better shot of totality since I'm not trying to post while still taking pictures. Check out all those flares! 🔭

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Apr 08, 2024 at 18:58 UTC

Totality worth it. 🔭

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Apr 08, 2024 at 17:26 UTC

Eclipse!

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Apr 08, 2024 at 15:38 UTC

Dallas area. Sun is poking out. 🤞

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Apr 08, 2024 at 15:10 UTC

Good morning from cloudy Dallas. ☁️🔭

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Apr 08, 2024 at 01:16 UTC

Luckily, I was in Tennessee for the 2017 total eclipse and managed to get some great photos. I just want everyone else in the family that I'm with to have the same experience. ☀️🌑🔭

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Apr 07, 2024 at 17:06 UTC

The Sun is looking great today with a couple of big sunspots. 🌞 🔭

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Apr 07, 2024 at 13:56 UTC

The forecast for our location near Dallas is not looking great for the eclipse tomorrow. 🌥️🔭

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Kevin Hardegree-Ullman @kevinkhu.bsky.social [ View ] Mar 23, 2024 at 03:22 UTC

The Moon is on fire tonight! 🌖😇 🔭

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