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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2406.09270 |
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| _version_ | 1866909223353319424 |
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| author | 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 |
| author_facet | 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 |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_09270 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Discovery and Extensive Follow-Up of SN 2024ggi, a nearby type IIP supernova in NGC 3621 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 High Energy Astrophysical Phenomena 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. |
| title | Discovery and Extensive Follow-Up of SN 2024ggi, a nearby type IIP supernova in NGC 3621 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2406.09270 |