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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2510.01373 |
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| author | Sakai, Nobuyuki Poshyachinda, Saran Sugiyama, Koichiro Rujopakarn, Wiphu Soonthornthum, Boonrucksar Leckngam, Apichat Kramer, Busaba Jaroenjittichai, Phrudth Pimpanuwat, Bannawit Singwong, Dan Kanjana, Kitipoom Prasert, Nikom Punyawarin, Songklod Sarris, Spiro Chairin, Teep Bandudej, Kamorn Nuchur, Chalunthon Sani, Haseng Chanwedchasart, Nattawit Chatuphot, Pathit Jiraya, Prachayapan Sathipjan, Saharat Eakwan, Adirake Larkaew, Chayanin Naewchan, Settasak Pha-Kham, Pichate Duangbuppha, Siritida Chaichana, Thodsawat Bunwong, Attapon Doomcome, Panupan Poonnawatt, Anya Noisapung, Warakorn Sathapornvajana, Pathorn Yawilerng, Naphat Dilokthanakul, Thita Angkaew, Kritsada Chaiwongwan, Nattawut Khanchaiyapoom, Jittimat Kobayashi, Hideyuki Chen, Yu-An Intrarat, Nawamin Wieching, Gundolf Barr, Ewan Wu, Jason Esser, Niclas Winchen, Tobias Vicente, Pablo |
| author_facet | Sakai, Nobuyuki Poshyachinda, Saran Sugiyama, Koichiro Rujopakarn, Wiphu Soonthornthum, Boonrucksar Leckngam, Apichat Kramer, Busaba Jaroenjittichai, Phrudth Pimpanuwat, Bannawit Singwong, Dan Kanjana, Kitipoom Prasert, Nikom Punyawarin, Songklod Sarris, Spiro Chairin, Teep Bandudej, Kamorn Nuchur, Chalunthon Sani, Haseng Chanwedchasart, Nattawit Chatuphot, Pathit Jiraya, Prachayapan Sathipjan, Saharat Eakwan, Adirake Larkaew, Chayanin Naewchan, Settasak Pha-Kham, Pichate Duangbuppha, Siritida Chaichana, Thodsawat Bunwong, Attapon Doomcome, Panupan Poonnawatt, Anya Noisapung, Warakorn Sathapornvajana, Pathorn Yawilerng, Naphat Dilokthanakul, Thita Angkaew, Kritsada Chaiwongwan, Nattawut Khanchaiyapoom, Jittimat Kobayashi, Hideyuki Chen, Yu-An Intrarat, Nawamin Wieching, Gundolf Barr, Ewan Wu, Jason Esser, Niclas Winchen, Tobias Vicente, Pablo |
| contents | Although the optical cometary database is extensive, the radio database is limited. The 18-cm OH maser observations of comets allow us to determine (i) the production rate of OH ($Q_{\rm{OH}}$) and (ii) the water expansion velocity, for each comet. To reveal the physical properties of the periodic comet 12P/Pons-Brooks, we conducted the OH maser observations of the comet using the 40-m TNRT (Thai National Radio Telescope) on March 22nd, 27th and 29th, 2024 before the perihelion passage on April 21st, 2024. We successfully detected 1665 and 1667 MHz OH maser emissions from the comet. The average OH production rates of 12P/Pons-Brooks were determined as 4.28$\pm$0.30 $\times$ 10$^{29}$ sec$^{-1}$, 5.21$\pm$0.42 $\times$ 10$^{29}$ sec$^{-1}$, and 3.36$\pm$0.43 $\times$ 10$^{29}$ sec$^{-1}$ for March 22nd, 27th and 29th, respectively. Combining our results with previous estimates, we find that the OH production rate of 12P/Pons-Brooks shows some fluctuations on timescales of a few days, but gradually increases on longer timescales as the comet approaches the last perihelion. The water expansion velocities of the comet were determined to be 1.55$\pm$0.14 km s$^{-1}$, 1.55$\pm$0.35 km s$^{-1}$, and 2.02$^{+0.47}_{-0.45}$ km s$^{-1}$ for the observations on March 22nd, 27th and 29th, respectively. The reason why the errors are different is because the signal to noise ratio is different for each OH maser emission. All expansion velocities are consistent with the individual results of the heuristic law (Tseng et al. 2007) within errors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_01373 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Detection of OH maser emission in the 71-year periodic comet 12P/Pons-Brooks using the 40-m Thai National Radio Telescope (TNRT) Sakai, Nobuyuki Poshyachinda, Saran Sugiyama, Koichiro Rujopakarn, Wiphu Soonthornthum, Boonrucksar Leckngam, Apichat Kramer, Busaba Jaroenjittichai, Phrudth Pimpanuwat, Bannawit Singwong, Dan Kanjana, Kitipoom Prasert, Nikom Punyawarin, Songklod Sarris, Spiro Chairin, Teep Bandudej, Kamorn Nuchur, Chalunthon Sani, Haseng Chanwedchasart, Nattawit Chatuphot, Pathit Jiraya, Prachayapan Sathipjan, Saharat Eakwan, Adirake Larkaew, Chayanin Naewchan, Settasak Pha-Kham, Pichate Duangbuppha, Siritida Chaichana, Thodsawat Bunwong, Attapon Doomcome, Panupan Poonnawatt, Anya Noisapung, Warakorn Sathapornvajana, Pathorn Yawilerng, Naphat Dilokthanakul, Thita Angkaew, Kritsada Chaiwongwan, Nattawut Khanchaiyapoom, Jittimat Kobayashi, Hideyuki Chen, Yu-An Intrarat, Nawamin Wieching, Gundolf Barr, Ewan Wu, Jason Esser, Niclas Winchen, Tobias Vicente, Pablo Earth and Planetary Astrophysics Astrophysics of Galaxies Although the optical cometary database is extensive, the radio database is limited. The 18-cm OH maser observations of comets allow us to determine (i) the production rate of OH ($Q_{\rm{OH}}$) and (ii) the water expansion velocity, for each comet. To reveal the physical properties of the periodic comet 12P/Pons-Brooks, we conducted the OH maser observations of the comet using the 40-m TNRT (Thai National Radio Telescope) on March 22nd, 27th and 29th, 2024 before the perihelion passage on April 21st, 2024. We successfully detected 1665 and 1667 MHz OH maser emissions from the comet. The average OH production rates of 12P/Pons-Brooks were determined as 4.28$\pm$0.30 $\times$ 10$^{29}$ sec$^{-1}$, 5.21$\pm$0.42 $\times$ 10$^{29}$ sec$^{-1}$, and 3.36$\pm$0.43 $\times$ 10$^{29}$ sec$^{-1}$ for March 22nd, 27th and 29th, respectively. Combining our results with previous estimates, we find that the OH production rate of 12P/Pons-Brooks shows some fluctuations on timescales of a few days, but gradually increases on longer timescales as the comet approaches the last perihelion. The water expansion velocities of the comet were determined to be 1.55$\pm$0.14 km s$^{-1}$, 1.55$\pm$0.35 km s$^{-1}$, and 2.02$^{+0.47}_{-0.45}$ km s$^{-1}$ for the observations on March 22nd, 27th and 29th, respectively. The reason why the errors are different is because the signal to noise ratio is different for each OH maser emission. All expansion velocities are consistent with the individual results of the heuristic law (Tseng et al. 2007) within errors. |
| title | Detection of OH maser emission in the 71-year periodic comet 12P/Pons-Brooks using the 40-m Thai National Radio Telescope (TNRT) |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.01373 |