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공학
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DBpia AI
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AI 아이디어
AI 리더
AI 뷰어
Citeasy
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지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Context . Edge-on disks offer a unique opportunity to directly examine their vertical structure, which provides valuable insights into planet formation processes. We investigated the dust properties as well as the CO and HCO + gas properties in the edge-on disk surrounding the T Tauri star 2MASS J04202144+281349 (SSTTau042021). Aims . We estimated the radial and vertical temperature and density profile for the gas and the dust. Methods . We used ALMA archival data of CO isotopologs and continuum emission at 2, 1.3, and 0.9 mm together with new NOEMA HCO + 3-2 observations. We retrieved the gas and dust disk properties using the tomographic method and the D ISK F IT model. Results . The vertical CO emission appears to be very extended and partly traces the H 2 wind observed by JWST. The C 18 O, 13 CO, and HCO + emission characterize the bulk of the molecular layer. The dust and gas have midplane temperatures of ∼7-11 K. The temperature of the molecular layer (derived from 13 CO and HCO + ) is on the order of 16 K. Because HCO + 3-2 is thermalized, we derived a lower limit for the H 2 volume density of ∼3 × 10 6 cm −3 at a radius of 100-200 au between one and two scale heights. The atmosphere temperature of the CO gas is ∼31 K at a radius of 100 au. We directly observed CO and HCO + gas in the midplane beyond the dust outer radius (≥300 au). The gas plus dust disk mass estimated up to a radius of 300 au is on the order of 4.6 × 10 −2 M ⊙ . Conclusions . The favorable disk inclination allows us to present the first quantitative evidence for vertical molecular stratification with a direct observation of CO and HCO + gas in the midplane. We estimate a temperature profile with a temperature of 7-11 K near the midplane and of 15-20 K in the dense part of the molecular layer up to ∼35 K above the midplane.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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