دورية أكاديمية
Complex Modulation of Rapidly Rotating Young M Dwarfs: Adding Pieces to the Puzzle
| العنوان: | Complex Modulation of Rapidly Rotating Young M Dwarfs: Adding Pieces to the Puzzle |
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| المؤلفون: | Günther, MN, Berardo, DA, Ducrot, E, Murray, CA, Stassun, KG, Olah, K, Bouma, LG, Rappaport, S, Winn, JN, Feinstein, AD, Matthews, EC, Sebastian, D, Rackham, BV, Seli, B, Amaury, AHM, Gillen, E, Levine, AM, Demory, BO, Gillon, M, Queloz, D, Ricker, GR, Vanderspek, RK, Seager, S, Latham, DW, Jenkins, JM, Brasseur, CE, Colón, KD, Daylan, T, Delrez, L, Fausnaugh, M, Garcia, LJ, Jayaraman, R, Jehin, E, Kristiansen, MH, Kruijssen, JMD, Pedersen, PP, Pozuelos, FJ, Rodriguez, JE, Wohler, B, Zhan, Z |
| بيانات النشر: | American Astronomical Society //dx.doi.org/10.3847/1538-3881/ac503c Astronomical Journal |
| سنة النشر: | 2022 |
| المجموعة: | Apollo - University of Cambridge Repository |
| مصطلحات موضوعية: | astro-ph.SR, astro-ph.EP |
| الوصف: | New sets of young M dwarfs with complex, sharp-peaked, and strictly periodic photometric modulations have recently been discovered with Kepler/K2 (scallop shells) and TESS (complex rotators). All are part of star-forming associations, are distinct from other variable stars, and likely belong to a unified class. Suggested hypotheses include star spots, accreting dust disks, co-rotating clouds of material, magnetically constrained material, spots and misaligned disks, and pulsations. Here, we provide a comprehensive overview and add new observational constraints with TESS and SPECULOOS Southern Observatory (SSO) photometry. We scrutinize all hypotheses from three new angles: (1) we investigate each scenario's occurrence rates via young star catalogs; (2) we study the features' longevity using over one year of combined data; and (3) we probe the expected color dependency with multi-color photometry. In this process, we also revisit the stellar parameters accounting for activity effects, study stellar flares as activity indicators over year-long time scales, and develop toy models to simulate typical morphologies. We rule out most hypotheses, and only (i) co-rotating material clouds and (ii) spots and misaligned disks remain feasible - with caveats. For (i), co-rotating dust might not be stable enough, while co-rotating gas alone likely cannot cause percentage-scale features; and (ii) would require misaligned disks around most young M dwarfs. We thus suggest a unified hypothesis, a superposition of large-amplitude spot modulations and sharp transits of co-rotating gas clouds. While the complex rotators' mystery remains, these new observations add valuable pieces to the puzzle going forward. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| العلاقة: | https://www.repository.cam.ac.uk/handle/1810/325217Test |
| DOI: | 10.17863/CAM.72673 |
| الإتاحة: | https://doi.org/10.17863/CAM.72673Test https://www.repository.cam.ac.uk/handle/1810/325217Test |
| حقوق: | Attribution 4.0 International ; https://creativecommons.org/licenses/by/4.0Test/ |
| رقم الانضمام: | edsbas.12DC6AB7 |
| قاعدة البيانات: | BASE |
| DOI: | 10.17863/CAM.72673 |
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