{"publication_status":"published","file":[{"checksum":"c8f64a78f36224d8e0ea1f324e43e389","access_level":"open_access","creator":"dernst","date_updated":"2026-05-04T06:36:00Z","content_type":"application/pdf","success":1,"file_name":"2026_AstrophysicalJournal_Chickles.pdf","relation":"main_file","file_size":1225916,"date_created":"2026-05-04T06:36:00Z","file_id":"21782"}],"status":"public","abstract":[{"lang":"eng","text":"We report the discovery of ATLAS J101342.5−451656.8 (hereafter ATLAS J1013−4516), an 8.56 minute orbital-period mass-transferring AM Canum Venaticorum (AM CVn) binary with a mean Gaia magnitude of G = 19.51, identified via periodic variability in light curves from the Asteroid Terrestrial-impact Last Alert System (ATLAS) of Gaia white dwarf candidates. Follow-up with the Large Lenslet Array Magellan Spectrograph shows a helium-dominated accretion disk, and high-speed ULTRACAM photometry reveals pronounced primary and secondary eclipses. We construct a decade-long timing baseline leveraging light curves from the ATLAS and Gaia surveys, as well as the high-speed imagers ULTRACAM on the New Energy Telescope and proto-Lightspeed on the Magellan Clay telescope. From this timing baseline, we measure an orbital period derivative of P 1.60 0.07 10 = ± × 12 s s−1. Interpreted in the context of stable mass transfer, the magnitude and sign of P indicate that the orbital evolution is governed by the interplay between gravitationalwave-driven angular-momentum losses and mass transfer, directly probing the donor’s structural response to mass loss. We constrain the accretor and donor mass based on stable mass-transfer arguments assuming angularmomentum loss dominated by gravitational-wave emission, allowing us to infer the characteristic gravitational\r\nwave strain of the binary for future space-based GW observatories such as the Laser Interferometer Space Antenna (LISA). We predict a characteristic strain corresponding to a 4 yr LISA signal-to-noise ratio ≳10, establishing ATLAS J1013−4516 as a strong prospective LISA source that will probe long-term orbital evolution in the mass-transferring regime."}],"day":"01","article_number":"237","_id":"21705","article_type":"original","date_updated":"2026-05-04T06:37:12Z","DOAJ_listed":"1","citation":{"ama":"Chickles ET, Chakraborty J, Burdge KB, et al. An eclipsing 8.56 minutes orbital period mass-transferring binary. <i>The Astrophysical Journal</i>. 2026;1000(2). doi:<a href=\"https://doi.org/10.3847/1538-4357/ae4871\">10.3847/1538-4357/ae4871</a>","ieee":"E. T. Chickles <i>et al.</i>, “An eclipsing 8.56 minutes orbital period mass-transferring binary,” <i>The Astrophysical Journal</i>, vol. 1000, no. 2. IOP Publishing, 2026.","short":"E.T. Chickles, J. Chakraborty, K.B. Burdge, V.S. Dhillon, P. Draghis, K. El-Badry, M.J. Green, A. Householder, S. Hughes, C. Layden, S.P. Littlefair, J. Munday, I. Pelisoli, M.S. Redden, J. Tonry, J.C. van Roestel, F.E. Angile, A.J. Brown, N.C. Segura, J. Dinsmore, M. Dyer, G. Furesz, M. Gabutti, J. Garbutt, J. García-Mejía, D. Jarvis, M.R. Kennedy, P. Kerry, J. Mccormac, G. Mo, D. Osip, S. Parsons, E. Pike, J.J. Piotrowski, R.W. Romani, D. Sahman, R. Simcoe, The Astrophysical Journal 1000 (2026).","chicago":"Chickles, Emma T., Joheen Chakraborty, Kevin B. Burdge, Vik S. Dhillon, Paul Draghis, Kareem El-Badry, Matthew J. Green, et al. “An Eclipsing 8.56 Minutes Orbital Period Mass-Transferring Binary.” <i>The Astrophysical Journal</i>. IOP Publishing, 2026. <a href=\"https://doi.org/10.3847/1538-4357/ae4871\">https://doi.org/10.3847/1538-4357/ae4871</a>.","ista":"Chickles ET, Chakraborty J, Burdge KB, Dhillon VS, Draghis P, El-Badry K, Green MJ, Householder A, Hughes S, Layden C, Littlefair SP, Munday J, Pelisoli I, Redden MS, Tonry J, van Roestel JC, Angile FE, Brown AJ, Segura NC, Dinsmore J, Dyer M, Furesz G, Gabutti M, Garbutt J, García-Mejía J, Jarvis D, Kennedy MR, Kerry P, Mccormac J, Mo G, Osip D, Parsons S, Pike E, Piotrowski JJ, Romani RW, Sahman D, Simcoe R. 2026. An eclipsing 8.56 minutes orbital period mass-transferring binary. The Astrophysical Journal. 1000(2), 237.","apa":"Chickles, E. T., Chakraborty, J., Burdge, K. B., Dhillon, V. S., Draghis, P., El-Badry, K., … Simcoe, R. (2026). An eclipsing 8.56 minutes orbital period mass-transferring binary. <i>The Astrophysical Journal</i>. IOP Publishing. <a href=\"https://doi.org/10.3847/1538-4357/ae4871\">https://doi.org/10.3847/1538-4357/ae4871</a>","mla":"Chickles, Emma T., et al. “An Eclipsing 8.56 Minutes Orbital Period Mass-Transferring Binary.” <i>The Astrophysical Journal</i>, vol. 1000, no. 2, 237, IOP Publishing, 2026, doi:<a href=\"https://doi.org/10.3847/1538-4357/ae4871\">10.3847/1538-4357/ae4871</a>."},"publisher":"IOP Publishing","publication":"The Astrophysical Journal","OA_place":"publisher","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","ddc":["520"],"OA_type":"gold","date_created":"2026-04-12T22:01:47Z","acknowledgement":"This work has made use of data from the Asteroid Terrestrial-impact Last Alert System (ATLAS) project. The Asteroid Terrestrial-impact Last Alert System (ATLAS) project is primarily funded to search for near-Earth asteroids through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search include images and catalogs from the survey area. This work was partially funded by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889 and STFC grants ST/T000198/1 and ST/S006109/1. The ATLAS science products have been made possible through the contributions of the University of Hawaii Institute for Astronomy, the Queen’s University Belfast, the Space Telescope Science Institute, the South African Astronomical Observatory, and the Millennium Institute of Astrophysics (MAS), Chile. VSD and ULTRACAM are supported by STFC grant ST/Z000033/1. J.G.M. gratefully acknowledges support from the Heising-Simons Foundation and the Pappalardo family through the MIT Pappalardo Fellowship in Physics.","date_published":"2026-04-01T00:00:00Z","scopus_import":"1","month":"04","year":"2026","department":[{"_id":"IlCa"}],"oa_version":"Published Version","doi":"10.3847/1538-4357/ae4871","title":"An eclipsing 8.56 minutes orbital period mass-transferring binary","issue":"2","author":[{"last_name":"Chickles","first_name":"Emma T.","full_name":"Chickles, Emma T."},{"full_name":"Chakraborty, Joheen","first_name":"Joheen","last_name":"Chakraborty"},{"first_name":"Kevin B.","last_name":"Burdge","full_name":"Burdge, Kevin B."},{"first_name":"Vik S.","last_name":"Dhillon","full_name":"Dhillon, Vik S."},{"full_name":"Draghis, Paul","first_name":"Paul","last_name":"Draghis"},{"full_name":"El-Badry, Kareem","first_name":"Kareem","last_name":"El-Badry"},{"last_name":"Green","first_name":"Matthew J.","full_name":"Green, Matthew J."},{"first_name":"Aaron","last_name":"Householder","full_name":"Householder, Aaron"},{"full_name":"Hughes, Sarah","first_name":"Sarah","last_name":"Hughes"},{"full_name":"Layden, Christopher","first_name":"Christopher","last_name":"Layden"},{"full_name":"Littlefair, Stuart P.","first_name":"Stuart P.","last_name":"Littlefair"},{"full_name":"Munday, James","last_name":"Munday","first_name":"James"},{"full_name":"Pelisoli, Ingrid","last_name":"Pelisoli","first_name":"Ingrid"},{"full_name":"Redden, Maya S.","last_name":"Redden","first_name":"Maya S."},{"first_name":"John","last_name":"Tonry","full_name":"Tonry, John"},{"first_name":"Joannes C","last_name":"van Roestel","id":"4d122fc8-6083-11f0-87a5-97d68b860333","full_name":"van Roestel, Joannes C"},{"full_name":"Angile, Francesco Elio","last_name":"Angile","first_name":"Francesco Elio"},{"full_name":"Brown, Alex J.","last_name":"Brown","first_name":"Alex J."},{"full_name":"Segura, Noel Castro","first_name":"Noel Castro","last_name":"Segura"},{"full_name":"Dinsmore, Jack","last_name":"Dinsmore","first_name":"Jack"},{"last_name":"Dyer","first_name":"Martin","full_name":"Dyer, Martin"},{"full_name":"Furesz, Gabor","first_name":"Gabor","last_name":"Furesz"},{"full_name":"Gabutti, Michelle","last_name":"Gabutti","first_name":"Michelle"},{"full_name":"Garbutt, James","first_name":"James","last_name":"Garbutt"},{"first_name":"Juliana","last_name":"García-Mejía","full_name":"García-Mejía, Juliana"},{"full_name":"Jarvis, Daniel","last_name":"Jarvis","first_name":"Daniel"},{"full_name":"Kennedy, Mark R.","first_name":"Mark R.","last_name":"Kennedy"},{"full_name":"Kerry, Paul","last_name":"Kerry","first_name":"Paul"},{"first_name":"James","last_name":"Mccormac","full_name":"Mccormac, James"},{"full_name":"Mo, Geoffrey","first_name":"Geoffrey","last_name":"Mo"},{"first_name":"Dave","last_name":"Osip","full_name":"Osip, Dave"},{"full_name":"Parsons, Steven","last_name":"Parsons","first_name":"Steven"},{"first_name":"Eleanor","last_name":"Pike","full_name":"Pike, Eleanor"},{"full_name":"Piotrowski, John J.","first_name":"John J.","last_name":"Piotrowski"},{"last_name":"Romani","first_name":"Roger W.","full_name":"Romani, Roger W."},{"full_name":"Sahman, David","last_name":"Sahman","first_name":"David"},{"last_name":"Simcoe","first_name":"Rob","full_name":"Simcoe, Rob"}],"type":"journal_article","quality_controlled":"1","article_processing_charge":"Yes","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"language":[{"iso":"eng"}],"file_date_updated":"2026-05-04T06:36:00Z","volume":1000,"has_accepted_license":"1","external_id":{"arxiv":["2601.07925"]},"oa":1,"intvolume":"      1000","publication_identifier":{"eissn":["1538-4357"],"issn":["0004-637X"]},"arxiv":1}