{"paper":{"title":"Hints of Disk Substructure in the First Brown Dwarf with a Dynamical Mass Constraint","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.SR","authors_text":"A\\'ina Palau, Alejandro Santamar\\'ia Miranda, \\'Alvaro Ribas, Anibal Sierra, Benjam\\'in Carrera, Carolina Agurto-Gangas, Isabel Rebollido, Itziar de Gregorio-Monsalvo, James M. Miley, Jinshi Sai, Laura P\\'erez, Matthias R. Schreiber, Nicol\\'as T. Kurtovic, Nuria Hu\\'elamo, Pablo Rivi\\`ere-Marichalar, Paola Pinilla, Pietro Curone","submitted_at":"2025-05-12T22:42:37Z","abstract_excerpt":"We present high-resolution ALMA observations at 0.89 mm of the Class II brown dwarf 2MASS J04442713+2512164 (2M0444), achieving a spatial resolution of 0$.\\!\\!^{\\prime\\prime}$046 ($\\sim$6.4 au at the distance to the source). These observations targeted continuum emission together with $^{12}$CO (3-2) molecular line. The line emission traces a Keplerian disk, allowing us to derive a dynamical mass between 0.043-0.092 M${_{\\odot}}$ for the central object. We constrain the gas-to-dust disk size ratio to be $\\sim$7, consistent with efficient radial drift. However, the observed dust emission sugges"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.08107","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2505.08107/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}