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80 results for “warrickball”
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@warrickball I didn't know I needed this #adventOfTESS 🙌
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@warrickball Great presentation at #RSECon23 on reinvention. Do you know if the video is available for it yet? I'd like to share it with others.
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@warrickball @pyodide I use pyodide to run a whole bunch of things. For example:
IDE for drawing #svg images with #python:
http://svg.orsinium.dev/#Flake8 with plugins:
https://wps.orsinium.dev/ -
This #TESStuesday is more than just another closed tab. I spent some evenings last week selecting different eclipsing binaries for and adding some actual descriptions to my (still quite rough) Atlas of TESS Light Curves:
https://warrickball.gitlab.io/tess-atlas/eb/ea.html
Now featuring
- Algol (β Per),
- Thuban (α Dra),
- γ Per,
- ζ Phe,
- HW Viras well as oscillating Algol variables
- RZ Cas,
- AB Cas,
- Y Cam and
- AS Eri!Hope to chip away at descriptions soon.
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@warrickball
I love #TESStuesday!!!! Thank you for helping keep the tradition alive -
You may have forgotten about #TESStuesday! But rest assured... so did I actually. Anyway, Panetier et al. yesterday presented power spectra of some very bright (G<6ish) stars which are solar-like oscillators, from TESS data:
https://arxiv.org/abs/2605.14713
Though I'd question the significance of some detections, there are plenty of great detections in Appendix B. Here's υ Cep, which is known to be a binary star. I'm not sure if all these oscillations are certainly from one star.
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Dylan Ayrey and Mike Nolan's talk from #fosdem26 is a thought-provoking dive into the history of copyright and asks heavy questions about open source in the age of generative AI.
"Let's end open source together with this one simple trick"
The website near the end exists:
(Thanks to a colleague for sharing.)
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Dylan Ayrey and Mike Nolan's talk from #fosdem26 is a thought-provoking dive into the history of copyright and asks heavy questions about open source in the age of generative AI.
"Let's end open source together with this one simple trick"
The website near the end exists:
(Thanks to a colleague for sharing.)
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Dylan Ayrey and Mike Nolan's talk from #fosdem26 is a thought-provoking dive into the history of copyright and asks heavy questions about open source in the age of generative AI.
"Let's end open source together with this one simple trick"
The website near the end exists:
(Thanks to a colleague for sharing.)
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Dylan Ayrey and Mike Nolan's talk from #fosdem26 is a thought-provoking dive into the history of copyright and asks heavy questions about open source in the age of generative AI.
"Let's end open source together with this one simple trick"
The website near the end exists:
(Thanks to a colleague for sharing.)
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I mentioned Gaia DR4 as my most anticipated #astronomy event this year but this Nature Astronomy editorial made me aware that CubeSpec and TOLIMAN are due to launch. I can't now found details about what data TOLIMAN will report but I'm hoping its something we can use for #asteroseismology. Both α Cen A and B are known to be solar-like oscillators.
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If you have even the slightest curiosity about optimising compilers and aren't already following @mattgodbolt's Advent of Compiler Optimisations, you absolutely should.
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This #TESStuesday, it looks like a new high-level science product (HLSP) for TESS is coming to MAST soon: TEQUILA, by Ogunwale et al. 🌵
https://arxiv.org/abs/2511.19313
This looks like a surprisingly simple but effective differential imaging + simple aperture photometry pipeline. Light curves aren't available yet so I'll be watching out to maybe have a look for some red giants to see how it fares with solar like oscillators.
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Glad to see a descendent of another stellar evolution code that I once used putting out a fresh instrument paper (of a series to be?):
https://arxiv.org/abs/2511.02801
I've always found Cesam2k20 particularly interesting because I think it has the most advanced treatment (among 1D codes) of rotation, and because it possibly uniquely uses a collocation method to solve the spatial equations.
Find out more about the code at their website:
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For #asteroseismology, Kepler's sensitivity and observing duration is unparalleled. TESS has been exciting for otherwise-interesting bright stars but I've felt K2 was neglected. The 90d baseline is valuable but the systematics gnarly. So I'm delighted to see Hookway et al.'s (2025) analysis of solar-like oscillators in the K2 "KEYSTONE" sample.
https://arxiv.org/abs/2510.21626
Here's an example power spectrum for a late subgiant, where the symbols indicate individual oscillation modes. 🤩
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It's still #TESStuesday! And today's there's some neat #asteroseismology.
You may have heard of the "Methusaleh star", which is very old but I honestly don't think was ever a challenge to the accepted age of the Universe. But this study of the oscillations based on TESS data is nevertheless interesting because it's very poor in metals relative to other asteroseismic targets, and shows that our rough rules for oscillation properties seem to deviate at low metallicity.
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Yo dawg, we herd u like eclipses so we put eclipses in yo eclipses so u can eclipse while u eclipse
Crudely (!) adapted from Fig. 9 of
Borkovits et al., "Ten new, ultracompact triply eclipsing triple star systems", accepted in A&A
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I might incur 13.7 days of bad luck for sharing a non-TESS light curve on #TESStuesday but this multi-band light curve from the brand new Vera C. Rubin Observatory's commissioning data is too good. 🤩
This is a distant (16.6kpc), faint (18th magnitude) SX Phe variable but the light curve has the unmistakable shape (in the optical g band) of a δ Sct/SX Phe variable.
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Perhaps, like me, you enjoy the light curves of eclipsing binaries *and* pulsating stars, so for #TESStuesday, have a look at Alexios Liakos's "Asteroseismology of four eccentric double-lined spectroscopic eclipsing binaries". Some of the components are δ Sct variables, some are γ Dor variables, and some are both! 🤩
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I've foolishly decided to try to keep up some #TESStuesday momentum. I think today's a bit of a bonanza: "The TESS Ten Thousand Catalog" by Kostov et al.
https://arxiv.org/abs/2506.05631
In particular, have a look at the highlighted interesting systems in §5.4 (Figs 30–39) for some fascinating eclipse behaviour: precession, evolving starspots, general craziness (that's you, TIC 114936199) and more. 🤩
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You may have forgotten about #TESStuesday but I haven't (well, not entirely)! And it's a good excuse to bring up what might be the craziest eclipse lightcurve I've seen. Powell et al. figured it out back in 2022 but it's news to me and perhaps you too:
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The #AdventOfTESS has beaten me. I've run out of time to catch up for the weekend or fill in tomorrow. I can only leave you with the amplitude spectrum of δ Sct variable EW Cnc, aka WOCS 4006, a blue straggler in M67.
Vernikar et al. (2023) studied this an several other such stars and, among other things, show using Kepler data that the peak around 5.5 cycles per day is a contaminant (itself a δ Sct variable?).
https://ui.adsabs.harvard.edu/abs/2023MNRAS.524.1360V
Sorry I won't have time for more but Merry Christmas! 🎄
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Today the #AdventOfTESS offers our first (a bit surprisingly) RS CVn variable, DR Dra. There's stacks of data: it's been visible in 36 sectors and there's at least 23 sectors of 120-second data. Here I first shown the light curve, where we see the spots evolving on the K0 dwarf, which has a white dwarf orbiting it.
You might notice a few flares, which are not unusual in these systems but try the second light curve! 💥
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I've bent the rules of the #AdventOfTESS to pick the RR Lyrae variable WY Dra. To mix it up a bit, here's a sort of phase fold on slightly under 5× the pulsation period (0.589d) to show just how much data there is. This is TESS sectors 52–54, so about ~81d of data, or about 150 pulsation periods, all recorded at 2-minute cadence. 🤩 There's ~18 sectors across all cadences.
Relative brightness changes are reasonable; the absolute scale is a nonsense artefact of my phase fold offset.
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It's another truly interesting eclipsing binary in the #AdventOfTESS!
TESS has observed CK Dra during 8 sectors spread over more than 4½ years. The segment of the continuous light curve shows the eclipses superimposed on background variation that I think is misaligned tidal distortion. Better still, the second plot are the first and last complete orbits in the data, showing how the non-eclipsing variations have changed over those ~4½ years.
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You sigh at another eclipsing binary in the #AdventOfTESS but at least this one comes with a twist. U Col looks is in many ways a typical eclipsing binary ...
... but it's also a pulsating star, with one of the stars being a δ Sct variable. You can see the basic idea in the amplitude spectrum (up to ~25 c/d is orbital harmonics; ~40-65 c/d is pulsations) but there's a more detailed analysis in Chen et al. (2022). Look for TIC 124688144 in the arXiv version:
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The #AdventOfTESS marches on! Today it's AD Boo, which might draw a yawn because it's yet another eclipsing binary, but it's also a double-lined spectroscopic binary. The absolute masses and radii can be derived precisely enough for it to feature on John Southworth's list of detached, well-characterised binaries.
https://www.astro.keele.ac.uk/jkt/debcat/
The phase-folded light curve is another textbook example.
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Since it's a Saturday in the #AdventOfTESS, I'm taking a bit of time to skip ahead to a very interesting object on the list: EI Psc. If I've understood the catalogues correctly, this is a cataclysmic variable—a class of accreting white dwarfs (WDs) that occasionally brighten for various reasons. Here, the WD's accretion disk suddenly becomes optically thick and much brighter. The accretion rate then rises and drains the extra material from the disk, so that it goes back to being optically thin.
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Are we halfway through the #AdventOfTESS? I sort of hope so: it's quite hard keeping this up!
Today we've got VZ Psc, an tiny contact binary (~6h orbital period) that probably comprises two red dwarfs. This was observed in TESS's super short cadence (20s!) mode, surprisingly as part of a proposal to observe solar-like oscillations (GO Program 6191, PI: Ashley Chontos). Not sure we were ever going to see oscillations but glad they observed it anyway!