{
  "annotation_id": "1cd676b1-8e13-4cf6-bba8-98ba4786c5c1",
  "date_created": "2026-02-17T05:53:12.525000Z",
  "date_modified": "2026-02-17T05:53:12.525000Z",
  "file_hash": "fc462c6b22e9e8a201cc72dff0c96b245fa9e8d42c9f95c5c2eefc9b0011d85e",
  "private": false,
  "record": {
    "abstract": "We report the discovery of ATLAS J101342.5-451646.8 (hereafter ATLAS J1013-4516), an eclipsing, mass-transferring AM Canum Venaticorum binary with an 8.56-minute orbital period, identified via periodic variability in light curves from the Asteroid Terrestrial-impact Last Alert System survey of Gaia white dwarf candidates. Follow-up spectroscopy with the Large Lenslet Array Magellan Spectrograph reveals a helium-dominated accretion disk, while high-speed photometry with ULTRACAM shows pronounced primary and secondary eclipses. We construct a decade-long timing baseline using data from ATLAS, Gaia, ULTRACAM on the New Technology Telescope, and the proto-Lightspeed instrument on the Magellan Clay telescope. From this baseline, we measure an orbital period derivative of dP/dt = -1.60 +/- 0.07 x 10^-12 seconds per second. Interpreted in the context of stable mass transfer, the magnitude and sign of the period derivative indicate that the orbital evolution is governed by the interplay between gravitational-wave-driven angular momentum losses and mass transfer, directly probing the donor star\u0027s structural response to mass loss. Assuming angular momentum loss dominated by gravitational wave emission, we constrain the component masses and infer the characteristic gravitational wave strain of the system for future space-based observatories such as the Laser Interferometer Space Antenna. We predict a characteristic strain corresponding to a four-year signal-to-noise ratio greater than approximately 20, establishing ATLAS J1013-4516 as a strong prospective source for probing long-term orbital evolution in the mass-transferring regime.",
    "arxiv_id": "2601.07925",
    "authors": [
      "Emma T. Chickles",
      "Joheen Chakraborty",
      "Kevin B. Burdge",
      "Vik S. Dhillon",
      "Paul Draghis",
      "Kareem El-Badry",
      "Matthew J. Green",
      "Aaron Householder",
      "Sarah Hughes",
      "Christopher Layden",
      "Stuart P. Littlefair",
      "James Munday",
      "Ingrid Pelisoli",
      "Maya S. Redden",
      "John Tonry",
      "Jan van Roestel",
      "F. Elio Angile",
      "Alex J. Brown",
      "Noel Castro",
      "Jack Dinsmore",
      "Martin Dyer",
      "Gabor Furesz",
      "Michelle Gabutti",
      "James Garbutt",
      "Daniel Jarvis",
      "Mark R. Kennedy",
      "Paul Kerry",
      "James McCormac",
      "Geoffrey Mo",
      "Dave Osip",
      "Steven Parsons",
      "Eleanor Pike",
      "Jack Piotrowski",
      "Roger W. Romani",
      "David Sahman",
      "Rob Simcoe"
    ],
    "categories": [
      "astro-ph.SR"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "title": "An eclipsing 8.56 minute orbital period mass-transferring binary",
    "url": "https://arxiv.org/abs/2601.07925",
    "version": "v4"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "405e11fe-c10e-458f-b6ca-de6b0cfc6e14",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}