@CLASS_telescope

Cosmology Large Angular Scale Surveyor | Measuring the Cosmic Microwave Background @JohnsHopkins | Discovering when the universe first lit up #NSFfunded

 San Pedro de Atacama, Chile | Johns Hopk…
sites.krieger.jhu.edu/class/
Joined June 2018
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  • Followers594
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⚡️ There it is! ⚡️ The title says it all: "A Measurement of the Largest-Scale CMB E-mode Polarization with CLASS". #NSFfunded arxiv.org/abs/2501.11904
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The secret to success at CLASS? 💡 An A-Team of top US and international scholars learning, collaborating, and solving problems together. When global minds work side-by-side, everyone wins. 🌐
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Out in the Atacama Desert sharing the wonder of the cosmos! 🌌 CLASSmate Jullianna Couto represented CLASS at the San Pedro de Atacama Science Fair, talking all things CMB and telescopes. And of course, our mascot Classito tagged along for the ride. 🔭🤖
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CLASS Project retweeted
ALMA Observatory📡@almaobsOct 8
👏Seven projects developed by students at ALMA to solve everyday problems. ✨"ALMA Atacama Makers"📡 has concluded, and we thank the Toconao Educational Complex and the Likan Antai Bicentennial High School of San Pedro de Atacama for their participation.
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New SPT-3G Martsen et al: "Using a cluster catalog from the 5-year SPT-3G main survey ... we detect cluster clustering at 12.8𝜎, the highest S/N detection from a SZ cluster sample .. and constrain halo bias, b_h =5.30 ±0.24" arxiv.org/pdf/2610.08947 @NSF @doescience #Antarctica
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IceCube Principal Investigator and @UWMadison Prof. Francis Halzen has been awarded the 2026 Nobel Prize in Physics "for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.” 🎉🏅 #NobelPrizeInPhysics2026
Nobel Prize in Physics 2026 Francis Halzen graphic with a headshot of Francis crossing his arms.

ALT Nobel Prize in Physics 2026 Francis Halzen graphic with a headshot of Francis crossing his arms.

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New results from CLASS! 📡✨ Using data across 90, 150, and 220 GHz, we present improved constraints on CMB circular polarization (Stokes V), tightening large-scale limits by up to ~5–25× and extending reach to ℓ = 700. Cross-correlating with @Planck, we also report the first limits on the temperature–circular polarization (TV) power spectrum to date—both VV and TV remain consistent with zero. Plus, new measurements of atmospheric Zeeman splitting across all CLASS bands! Read the preprint here: arxiv.org/abs/2609.40125
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CLASSmate Jullianna Couto at the Roman launch ❤️🚀
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Next for neutrinos? SLAC is involved in several experiments that aim to shine light on the elusive ghostly particles. Neutrinos could link to cosmic evolution, dark matter & matter’s dominance over antimatter in the universe! 70 years since discovery & still so much to learn.
The image shows a complex network of pipes and machinery inside the European Organization for Nuclear Research (CERN) facility. The equipment is arranged symmetrically along a metal grid floor, with numerous cables and hoses connecting various components. The environment appears industrial and highly technical. Credit: (Istituto Nazionale di Fisica Nucleare)

ALT The image shows a complex network of pipes and machinery inside the European Organization for Nuclear Research (CERN) facility. The equipment is arranged symmetrically along a metal grid floor, with numerous cables and hoses connecting various components. The environment appears industrial and highly technical. Credit: (Istituto Nazionale di Fisica Nucleare)

Liz Triller's gloved hand holding the clips she produced for the full-scale demonstrator of the DUNE near detector. (Jacqueline Ramseyer Orrell/SLAC National Accelerator Laboratory)

ALT Liz Triller's gloved hand holding the clips she produced for the full-scale demonstrator of the DUNE near detector. (Jacqueline Ramseyer Orrell/SLAC National Accelerator Laboratory)

View of the inside of the MicroBooNE detector at Fermilab before it was filled with 170 tons of liquid argon for neutrino detection. The experiment will help researchers better understand the three neutrino types and look for a hypothetical fourth one. (Fermi National Accelerator Laboratory)

ALT View of the inside of the MicroBooNE detector at Fermilab before it was filled with 170 tons of liquid argon for neutrino detection. The experiment will help researchers better understand the three neutrino types and look for a hypothetical fourth one. (Fermi National Accelerator Laboratory)

Part of the EXO-200 underground neutrino detector. A copper frame surrounds what looks like yellow circuit components. Credit: Exo Collaboration

ALT Part of the EXO-200 underground neutrino detector. A copper frame surrounds what looks like yellow circuit components. Credit: Exo Collaboration

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Nobel laureate John Mather is one of thousands opposing a proposed federal rule that could affect science grant funding. "Peer review protects the public from attempts to corrupt," he writes. Read more public comments in #APSNews, then submit your own comment by July 13: go.aps.org/3RtXoy8
John Mather, a smiling older man with gray hair and glasses, sits at a conference table using a laptop. Beside him is a colorful spherical model of the cosmic microwave background, along with a stainless steel water bottle. The meeting room has windows, office chairs, and a whiteboard in the background.

ALT John Mather, a smiling older man with gray hair and glasses, sits at a conference table using a laptop. Beside him is a colorful spherical model of the cosmic microwave background, along with a stainless steel water bottle. The meeting room has windows, office chairs, and a whiteboard in the background.

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The future of science starts with today's students. A proposed federal rule could create new barriers for STEM education, training grants, and other programs that help launch scientific careers. Submit a public comment by July 13: go.aps.org/4vbmWyB
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The CLASSroom is back in session! 🔭 CLASSmates reunited at the #SPIE2026 Telescopes and Instrumentation conference in Copenhagen. Great to catch up, talk shop, and see so many familiar faces! ❤️
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New SPT-3G cluster catalog! arxiv.org/abs/2607.01175 "the sample consists of 8,892 cluster candidates .. 1,780 clusters are at z>1 and 271 at z>1.5 .. the sample is significantly deeper, with a cluster density of 4.5 confirmed clusters/deg2" @NSF @doescience #Antarctica
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New paper alert! 🚨 Here is the full work-up on the detectors for our new 90 GHz telescope. Developed with @NIST, we’ve now partnered with two cutting-edge detector fabs (including @NASA), allowing for a unique side-by-side comparison. Check out detector expert John Appel’s ever-innovative analysis here: arxiv.org/abs/2606.26576
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New Reflective Half-Wave Plate Polarization Modulator with the team in Chile! Ready to install on the second 90 GHz telescope 📡 This greatly increases the speed at which we measure the CMB linear polarization 🏎️ For more on the modulator: arxiv.org/abs/2407.08912.
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Congratulations to two stellar undergraduate CLASSmates, Lucie Afko and Seti Norris, who will be attending grad school in physics and astronomy next year at the University of British Columbia and City University of New York! Great job and good luck, Lucie and Seti! ❤️
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Behold the mighty viscacha. These cuties come out to sun themselves on the rocks by the telescopes. It's good luck to spot a viscacha on the way to the site.
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CLASSmates at the @JHUPhysicsAstro annual Physics Fair this past weekend! The fair attracts hundreds of Marylanders big and small for physics and astronomy activities and demos. 🚀
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🚨 NEW PAPER in A&A: predictions of PWV in the Chajnantor area using AI techniques and our 183 GHz radiometer, improving current GFS forecasts in 12 and 24 hr horizons: aanda.org/articles/aa/abs/20… @SimonsObs @CLASS_telescope @almaobs @ApexTelescope
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Thanks to an epic effort by the Chile site team and by students and staff at JHU and Villanova, we have repaired our modulator and recovered from a brief down time! instagram.com/reel/DRFpxH_D-…

Ju 🔭 Astro (@ju.s.t.a.r) • Instagram reel

instagram.com
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Beautiful new reflective half-wave plate being made here. The copper sheen is about a kilometer's worth of 100 µm wire. Though admittedly with the handles and the color it looks like paella 🥘!
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