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Daichi Tsuna

As seen in: Nature, The Astronomical Journal, Physical Review B
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Articles by Daichi Tsuna

Extremely stripped supernova reveals a silicon and sulfur formation site

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By Steve Schulze, Avishay Gal-Yam, Luc Dessart, Adam Miller, Stan Woosley, Yi Yang, Mattia Bulla, Jesper Sollerman, Alexei V. Filippenko, Daniel Perley, Daichi Tsuna, Ragnhild Lunnan, Sean Brennan Verified, Seán Brennan, Thomas G. Brink, Ping Chen, Kaustav Das, Suhail Dhawan, Claes Fransson, Christoffer Fremling, Anders Jerkstrand, Doron Kushnir, Keiichi Maeda, Kate Maguire, Eran O. Ofek, Conor Omand, Yashvi Sharma, Gokul P Srinivasaragavan, Nora L. Strothjohann, Yuki Takei, Eli Waxman, Lin Yan, Yuhan Yao, Weikang Zheng, Erez Zimmerman, Eric C. Bellm, Michael Coughlin, Frank J. Masci, Mickael Rigault, Shrinivas R. Kulkarni, Ofer Yaron, K-Ryan Hinds, Nikhil Sarin, Rachel J. Bruch, Anjasha Gangopadhyay, Ido Irani, Yu-Jing Qin, Josiah Purdum, Avery Wold
| Nature Verified
Abstract Stars are initially powered by the fusion of hydrogen to helium. These ashes serve as fuel in a series of stages1,2,3, transforming massive stars into a structure of shells. These are composed of natal hydrogen on the outside and consecutively heavier compositions inside, predicted to be dominated by He, C/O, O/Ne/Mg and O/Si/S (refs. 4,5). Silicon and sulfur are fused into iron, leading to the collapse of the core and either a supernova explosion or the formation of a black hole6,7,8,9.
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Gravitational-wave searches for cosmic string cusps in Einstein Telescope data using deep learning

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By Melissa Lopez, Daichi Tsuna, Sarah Caudill, Quirijn Meijer
| Physical Review B
Gravitational-wave searches for cosmic strings are currently hindered by the presence of detector glitches, some classes of which strongly resemble cosmic string signals. This confusion greatly reduces the efficiency of searches. A deep-learning model is proposed for the task of distinguishing between gravitational-wave signals from cosmic string cusps and simulated blip glitches in design sensitivity data from the future Einstein Telescope.
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Slowly decaying ringdown of a rapidly spinning black hole: Probing the no-hair theorem by small mass-ratio mergers with LISA

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By Naritaka Oshita, RIKEN iTHEMS, Yoshida Ushinomiyacho, Daichi Tsuna
| Physical Review B
The measurability of multiple quasinormal (QN) modes, including overtones and higher harmonics, with the Laser Interferometer Space Antenna is investigated by computing the gravitational wave (GW) signal induced by an intermediate or extreme mass ratio merger involving a supermassive black hole (SMBH). We confirm that the ringdown of rapidly spinning black holes are long-lived, and higher harmonics of the ringdown are significantly excited for mergers of small mass ratios.
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