{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.chthonian-planet","code":"thing-q928495","url":"https://ver.cy/models/thing/q928495/","name":"Chthonian planet","alternateNames":[],"kind":"thing","status":"research-draft","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"","entryKind":"","plane":"","domain":["PHY.SPC"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A hypothetical class of planet consisting of the remnant rocky or metallic core of a gas giant whose hydrogen and helium atmosphere has been stripped away by intense heating from a nearby star; some close-in exoplanets have been proposed as candidates.","purpose":"Let an agent explain chthonian planets as a hypothesis, with attributed candidate claims, formation models and observational tests.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Hypothetical","Stripped gas giant core","Very close to its star","High density"],"structure":{"bundles":[{"id":"hypothesis","name":"Hypothesis","description":"What is proposed.","layers":[{"id":"idea","name":"Idea","description":"Stripped cores.","findings":[{"id":"idea-finding","name":"Idea","description":"Idea.","questions":[{"text":"How would a gas giant lose its envelope to become a chthonian planet?","kind":"definition"},{"text":"How long would it take, according to models?","kind":"measurement"}]}]},{"id":"status","name":"Status","description":"Evidence.","findings":[{"id":"status-finding","name":"Status","description":"Evidential status.","questions":[{"text":"Has any planet been confirmed as a chthonian planet?","kind":"boundary"},{"text":"What evidence would be decisive?","kind":"definition"}]}]}]},{"id":"candidates","name":"Candidates","description":"Proposed examples.","layers":[{"id":"examples","name":"Examples","description":"Named candidates.","findings":[{"id":"examples-finding","name":"Examples","description":"Candidates.","questions":[{"text":"Which exoplanets have been proposed as exposed cores, and by whom?","kind":"provenance"},{"text":"Are the claims disputed?","kind":"boundary"}]}]},{"id":"data","name":"Data","description":"Mass and radius.","findings":[{"id":"data-finding","name":"Data","description":"Measurements.","questions":[{"text":"What are the measured mass, radius and density of this candidate?","kind":"measurement"},{"text":"How uncertain are they?","kind":"boundary"}]}]}]},{"id":"physics","name":"Physics","description":"Processes.","layers":[{"id":"escape","name":"Escape","description":"Atmospheric escape.","findings":[{"id":"escape-finding","name":"Escape","description":"Atmospheric escape.","questions":[{"text":"How does stellar radiation drive atmospheric escape?","kind":"definition"},{"text":"How is escape observed?","kind":"provenance"}]}]},{"id":"interior","name":"Interior","description":"Core composition.","findings":[{"id":"interior-finding","name":"Interior","description":"Interior.","questions":[{"text":"What would the core of a gas giant be made of, according to models?","kind":"provenance"},{"text":"How does that compare with rocky planets?","kind":"boundary"}]}]}]},{"id":"distinctions","name":"Distinctions","description":"Related classes.","layers":[{"id":"superearth","name":"Super-Earth","description":"Rocky planets.","findings":[{"id":"superearth-finding","name":"Super-Earth","description":"Super-Earths.","questions":[{"text":"How can a chthonian planet be told apart from a planet that formed rocky?","kind":"boundary"},{"text":"Which observations help?","kind":"definition"}]}]},{"id":"catalogue","name":"Catalogue","description":"Exoplanet archives.","findings":[{"id":"catalogue-finding","name":"Catalogue","description":"Catalogues.","questions":[{"text":"Where can exoplanet parameters be looked up?","kind":"provenance"},{"text":"How are classes labelled there?","kind":"definition"}]}]}]}]},"agentConduct":{"may":["explain the chthonian planet idea","summarise proposed candidates with sources","describe how atmospheric stripping works","distinguish from super-Earths"],"mustNot":[],"requiresHuman":[]},"ethics":{"considerations":[],"affectedParties":[]},"owners":{"steward":"","roles":[],"masterSystems":[]},"relations":[{"target":"hypothetical planet","type":"related","note":"category"},{"target":"hot Jupiter","type":"related","note":"precursor"},{"target":"super-Earth","type":"related","note":"related class"},{"target":"exoplanet science","type":"related","note":"field"}],"interaction":{"identity":{"applicability":"required","items":[]},"properties":{"applicability":"required","items":[]},"recognition":{"applicability":"required","items":["Dense close-in planets","Evidence of atmospheric escape","Super-Earths may form rocky from the start","Not directly imaged; inferred from mass, radius and density measurements of close-in exoplanets."]},"capabilities":{"applicability":"required","items":["explain the chthonian planet idea","summarise proposed candidates with sources","describe how atmospheric stripping works","distinguish from super-Earths"]},"hazards":{"applicability":"required","items":["Presenting candidates as confirmed","Over-interpreting density measurements"]},"interfaces":{"applicability":"required","items":["No specific regulation"]},"context":{"applicability":"required","items":["Exoplanet science and planet evolution.","proposed chthonian candidates","evaporating hot Jupiters (precursors)","exposed planetary cores"]}},"sources":[],"openQuestions":["Should candidates be separate entries?","How should exoplanet catalogues be linked?","How should claims be attributed?"],"resources":{"spec":"/models/things/publications/thing-q928495/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q928495/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T12:48:55Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"derived","ethics":"missing","owners":"missing","relations":"filled","interaction.identity":"missing","interaction.properties":"missing","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"missing"},"notes":{"agentConduct":"Affordances listed as what may be done; prohibitions collected from the text.","sources":"Written from model knowledge without web access; claims are unverified."},"score":0.676}}