{"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/mkt-j170456-2-482100-the-first-transient","title":"MKT J170456.2-482100: the first transient discovered by MeerKAT","arxiv_id":"1911.07713","date":"2019-11-18","proceeding":null,"authors":["L. N. Driessen","I. McDonald","D. A. H. Buckley","M. Caleb","E. J. Kotze","S. B. Potter","K . M. Rajwade","A. Rowlinson","B. W. Stappers","E. Tremou","P. A. Woudt","R. P. Fender","R. Armstrong","P. Groot","I. Heywood","A. Horesh","A. J. van der Horst","E. Koerding","V. A. McBride","J. C. A. Miller-Jones","K. P. Mooley","R. A. M. J. Wijers"],"abstract":"We report the discovery of the first transient with MeerKAT, MKT J170456.2$-$482100, discovered in ThunderKAT images of the low mass X-ray binary GX339$-$4. MKT J170456.2$-$482100 is variable in the radio, reaching a maximum flux density of $0.71\\pm0.11\\,\\mathrm{mJy}$ on 2019 Oct 12, and is undetected in 15 out of 48 ThunderKAT epochs. MKT J170456.2$-$482100 is coincident with the chromospherically active K-type sub-giant TYC 8332-2529-1, and $\\sim18\\,\\mathrm{years}$ of archival optical photometry of the star shows that it varies with a period of $21.25\\pm0.04\\,\\mathrm{days}$. The shape and phase of the optical light curve changes over time, and we detect both X-ray and UV emission at the position of MKT J170456.2$-$482100, which may indicate that TYC 8332-2529-1 has large star spots. Spectroscopic analysis shows that TYC 8332-2529-1 is in a binary, and has a line-of-sight radial velocity amplitude of $43\\,\\mathrm{km\\,s^{-1}}$. We also observe a spectral feature in anti-phase with the K-type sub-giant, with a line-of-sight radial velocity amplitude of $\\sim12\\pm10\\,\\mathrm{km\\,s^{-1}}$, whose origins cannot currently be explained. Further observations and investigation are required to determine the nature of the MKT J170456.2$-$482100 system.","url_abs":"https://arxiv.org/abs/1911.07713v1","url_pdf":"https://arxiv.org/pdf/1911.07713v1.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":"mkt-j170456-2-482100-the-first-transient","repo_url":"https://github.com/AstroLaura/MKTJ170456.2-482100PaperPlots","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","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}