Tootfinder

Detection of Rydberg lines from the atmosphere of Betelgeuse
W. R. F. Dent, G. Harper, A. M. S. Richards, P. Kervella, L. D. Matthews
https://arxiv.org/abs/2404.06501

Detection of Rydberg lines from the atmosphere of Betelgeuse
Emission lines from Rydberg transitions are detected for the first time from a region close to the surface of Betelgeuse. The H30$α$ line is observed at 231.905 GHz, with a FWHM ~42 km/s and extended wings. A second line at 232.025 GHz (FWHM ~21 km/s), is modeled as a combination of Rydberg transitions of abundant low First Ionization Potential metals. Both H30$α$ and the Rydberg combined line X30$α$ are fitted by Voigt profiles, and collisional broadening with electrons may be partly respon…

Is #Betelgeuse Really Rotating? Synthetic #ALMA Observations of Large-scale Convection in 3D Simulations of Red #Supergiants: https://iopscience.iop.org/article/10.3847/2041-8213/ad24fd -> A new spin on Betelgeuse’s boiling surface: https://www.mpa-garching.mpg.de/1094283/hl202403

This https://arxiv.org/abs/2312.02816 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The Great Dimming of Betelgeuse: the photosphere as revealed by tomography over the past 15 years
Betelgeuse, a red supergiant star of semi-regular variability, reached a historical minimum brightness in February 2020, known as the Great Dimming. Even though the brightness has returned to the values prior to the Great Dimming now, it continues to exhibit highly unusual behavior. Our goal is to study long-term dynamics of the photosphere, including during the Great Dimming. We applied the tomographic method, which allows different layers in the stellar atmosphere to be probed in order to rec…

Development of a data overflow protection system for Super-Kamiokande to maximize data from nearby supernovae
M. Mori, K. Abe, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Y…

Development of a data overflow protection system for Super-Kamiokande to maximize data from nearby supernovae
Neutrinos from very nearby supernovae, such as Betelgeuse, are expected to generate more than ten million events over 10\,s in Super-Kamokande (SK). At such large event rates, the buffers of the SK analog-to-digital conversion board (QBEE) will overflow, causing random loss of data that is critical for understanding the dynamics of the supernova explosion mechanism. In order to solve this problem, two new DAQ modules were developed to aid in the observation of very nearby supernovae. The first …