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Andrew Mann

New paper from my group! Stars aren’t born alone—they form in massive associations. If we want to understand how stars and planetary systems form, we need to figure out where today’s clusters came from… and where all their long-lost siblings ended up. arxiv.org/abs/2511.07533

Lost Sisters Found: TESS and Gaia Reveal a Dissolving Pleiades ComplexMost star clusters dissolve into the Galaxy over tens to hundreds of millions of years after they form. While recent Gaia studies have honed our view of cluster dispersal, the exact chronology of whic...arxiv.org
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1 прямых ответов · 10 сообщений

Andrew Mann

🧪🔭⭐ #starclusters #pleiades Gaia has revolutionized cluster-finding (see great work by @emily.space and many others). Our twist: combining Gaia with TESS rotations. TESS is ~ all-sky and gives rotation periods for millions of stars—a powerful way to identify coeval populations.

Ответ для Andrew Mann
Andrew Mann

🧪🔭⭐ #starclusters #pleiades Stellar rotation encodes age. Younger stars spin fast; older stars spin slowly. Using TESS periods (video attached—gyrochronology 101!), we trimmed down the list of possible Pleiades relatives far more effectively than position/kinematics alone.

Ответ для Andrew Mann
Andrew Mann

🧪🔭⭐ #starclusters #pleiades Then we combined: • Rotation-selected candidates • Gaia positions & velocities • Modern clustering tools → Result: a striking, coherent structure enveloping the Pleiades and stretching hundreds of parsecs (Figure 2 in the paper).

Ответ для Andrew Mann
Andrew Mann

🧪🔭⭐ #starclusters But is it real? We checked multiple independent tests: • Color–magnitude diagrams line up beautifully • Abundances match the Pleiades—and don’t match the field • And multiple substructures all trace back toward the same birthplace as the Pleiades core

Ответ для Andrew Mann
Andrew Mann

🧪🔭⭐ #starclusters #pleiades The traceback is fascinating: these groups were closest to the Pleiades ≈80 Myr ago. But the Pleiades age is ≈120 Myr. We don’t think the age is wrong—we think the STRUCTURE broke apart ~80 Myr ago, likely after interacting with another molecular cloud.

Ответ для Andrew Mann
Andrew Mann

🧪🔭⭐ #starclusters #pleiades So what is this thing? A vast, ≥500 pc-wide association containing tens of thousands of stars—including many previously “independent” groups. We call it: The Greater Pleiades Complex.

Ответ для Andrew Mann
Andrew Mann

🧪🔭⭐ #starclusters #pleiades Here’s what it would look like if every member were bright enough for the naked eye—seen from the Old Well on the UNC campus. Gorgeous artwork by grad student Isabel López Murillo. (A figure I’ll never get tired of.)

Ответ для Andrew Mann
Andrew Mann

🧪🔭⭐ Early results suggest the Pleiades are not unique. There may be many such dissolved or dissolving large-scale complexes hiding in the Gaia+TESS era. We’re already working on the next targets—stay tuned.

Ответ для Andrew Mann
Andrew Mann

🧪🔭⭐ An important sad note: this project was supported by NASA ADAP (80NSSC24K0619)—a program that is not included in the latest ROSES call. ADAP has been vital for work like this, which mines archival data for entirely new science. Its disappearance is 😭😭😭for science.

Ответ для Andrew Mann
pushkin99

That is sad news.