{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/the-btsbot-nearby-discovery-of-sn-2024jlf","title":"The BTSbot-nearby discovery of SN 2024jlf: rapid, autonomous follow-up probes interaction in an 18.5 Mpc Type IIP supernova","arxiv_id":"2501.18686","date":"2025-01-30","proceeding":null,"authors":["Nabeel Rehemtulla","W. V. Jacobson-Galán","Avinash Singh","Adam A. Miller","Charles D. Kilpatrick","K-Ryan Hinds","Chang Liu","Steve Schulze","Jesper Sollerman","Theophile Jegou du Laz","Tomás Ahumada","Katie Auchettl","S. J. Brennan","Michael W. Coughlin","Christoffer Fremling","Anjasha Gangopadhyay","Daniel A. Perley","Nikolaus Z. Prusinski","Josiah Purdum","Yu-Jing Qin","Sara Romagnoli","Jennifer Shi","Jacob L. Wise","Tracy X. Chen","Steven L. Groom","David O. Jones","Mansi M. Kasliwal","Roger Smith","Niharika Sravan","Shrinivas R. Kulkarni"],"abstract":"We present observations of the Type IIP supernova (SN) 2024jlf, including spectroscopy beginning just 0.7 days ($\\sim$17 hours) after first light. Rapid follow-up was enabled by the new $\\texttt{BTSbot-nearby}$ program, which involves autonomously triggering target-of-opportunity requests for new transients in Zwicky Transient Facility data that are coincident with nearby ($D<60$ Mpc) galaxies and identified by the $\\texttt{BTSbot}$ machine learning model. Early photometry and non-detections shortly prior to first light show that SN 2024jlf initially brightened by $>$4 mag/day, quicker than $\\sim$90% of Type II SNe. Early spectra reveal weak flash ionization features: narrow, short-lived ($1.3 < \\tau ~\\mathrm{[d]} < 1.8$) emission lines of H$\\alpha$, He II, and C IV. Assuming a wind velocity of $v_w=50$ km s$^{-1}$, these properties indicate that the red supergiant progenitor exhibited enhanced mass-loss in the last year before explosion. We constrain the mass-loss rate to $10^{-4} < \\dot{M}~\\mathrm{[M_\\odot~yr^{-1}]} < 10^{-3}$ by matching observations to model grids from two independent radiative hydrodynamics codes. $\\texttt{BTSbot-nearby}$ automation minimizes spectroscopic follow-up latency, enabling the observation of ephemeral early-time phenomena exhibited by transients.","url_abs":"https://arxiv.org/abs/2501.18686v2","url_pdf":"https://arxiv.org/pdf/2501.18686v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"the-btsbot-nearby-discovery-of-sn-2024jlf","repo_url":"https://github.com/nabeelre/btsbot","is_official":1,"mentioned_in_paper":0,"mentioned_in_github":0,"framework":"tf","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}