Discovery and Extensive Follow-Up of SN 2024ggi, a nearby type IIP supernova in NGC 3621
| Autor: | Chen, Ting-Wan, Yang, Sheng, Srivastav, Shubham, Moriya, Takashi J., Smartt, Stephen J., Rest, Sofia, Rest, Armin, Lin, Hsing Wen, Miao, Hao-Yu, Cheng, Yu-Chi, Aryan, Amar, Cheng, Chia-Yu, Fraser, Morgan, Huang, Li-Ching, Lee, Meng-Han, Lai, Cheng-Han, Liu, Yu Hsuan, K, Aiswarya Sankar., Smith, Ken W., Stevance, Heloise F., Wang, Ze-Ning, Anderson, Joseph P., Angus, Charlotte R., de Boer, Thomas, Chambers, Kenneth, Duan, Hao-Yuan, Erasmus, Nicolas, Gao, Hua, Herman, Joanna, Hou, Wei-Jie, Hsiao, Hsiang-Yao, Huber, Mark E., Lin, Chien-Cheng, Lin, Hung-Chin, Magnier, Eugene A., Man, Ka Kit, Moore, Thomas, Ngeow, Chow-Choong, Nicholl, Matt, Ou, Po-Sheng, Pignata, Giuliano, Shiau, Yu-Chien, Sommer, Julian Silvester, Tonry, John L., Wang, Xiao-Feng, Young, David R., Yeh, You-Ting, Zhang, Jujia |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We present the discovery and early observations of the nearby Type II supernova (SN) 2024ggi in NGC 3621 at 6.64 +/- 0.3 Mpc. The SN was caught 5.8 (+1.9 -2.9) hours after its explosion by the ATLAS survey. Early-phase, high-cadence, and multi-band photometric follow-up was performed by the Kinder (Kilonova Finder) project, collecting over 1000 photometric data points within a week. The combined o- and r-band light curves show a rapid rise of 3.3 magnitudes in 13.7 hours, much faster than SN 2023ixf (another recent, nearby, and well-observed SN II). Between 13.8 and 18.8 hours after explosion SN 2024ggi became bluer, with u-g colour dropping from 0.53 to 0.15 mag. The rapid blueward evolution indicates a wind shock breakout (SBO) scenario. No hour-long brightening expected for the SBO from a bare stellar surface was detected during our observations. The classification spectrum, taken 17 hours after the SN explosion, shows flash features of high-ionization species such as Balmer lines, He I, C III, and N III. Detailed light curve modeling reveals critical insights into the properties of the circumstellar material (CSM). Our favoured model has an explosion energy of 2 x 10^51 erg, a mass-loss rate of 10^-3 solar_mass/yr (with an assumed 10 km/s wind), and a confined CSM radius of 6 x 10^14 cm. The corresponding CSM mass is 0.4 solar_mass. Comparisons with SN 2023ixf highlight that SN 2024ggi has a smaller CSM density, resulting in a faster rise and fainter UV flux. The extensive dataset and the involvement of citizen astronomers underscore that a collaborative network is essential for SBO searches, leading to more precise and comprehensive SN characterizations. Comment: 11 pages, 5 figures in manuscript, 6 pages in appendix, submitted to ApJL |
| Databáze: | arXiv |
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