Jennifer B. Bergner, J. A. Sturm, Elettra L. Piacentino, M. K. McClure, Karin I. Oberg, A. C. A. Boogert, E. Dartois, M. N. Drozdovskaya, H. J. Fraser, Daniel Harsono, Sergio Ioppolo, Charles J. Law, Dariusz C. Lis, Brett A. McGuire, Gary J. Melnick, Jennifer A. Noble, M. E. Palumbo, Yvonne J. Pendleton, Giulia Perotti, Danna Qasim, W. R. M. Rocha, E. F. van Dishoeck
{"title":"JWST 冰带剖面显示 HH 48 NE 圆盘中的混合冰成分","authors":"Jennifer B. Bergner, J. A. Sturm, Elettra L. Piacentino, M. K. McClure, Karin I. Oberg, A. C. A. Boogert, E. Dartois, M. N. Drozdovskaya, H. J. Fraser, Daniel Harsono, Sergio Ioppolo, Charles J. Law, Dariusz C. Lis, Brett A. McGuire, Gary J. Melnick, Jennifer A. Noble, M. E. Palumbo, Yvonne J. Pendleton, Giulia Perotti, Danna Qasim, W. R. M. Rocha, E. F. van Dishoeck","doi":"arxiv-2409.08117","DOIUrl":null,"url":null,"abstract":"Planet formation is strongly influenced by the composition and distribution\nof volatiles within protoplanetary disks. With JWST, it is now possible to\nobtain direct observational constraints on disk ices, as recently demonstrated\nby the detection of ice absorption features towards the edge-on HH 48 NE disk\nas part of the Ice Age Early Release Science program. Here, we introduce a new\nradiative transfer modeling framework designed to retrieve the composition and\nmixing status of disk ices using their band profiles, and apply it to interpret\nthe H2O, CO2, and CO ice bands observed towards the HH 48 NE disk. We show that\nthe ices are largely present as mixtures, with strong evidence for CO trapping\nin both H2O and CO2 ice. The HH 48 NE disk ice composition (pure vs. polar vs.\napolar fractions) is markedly different from earlier protostellar stages,\nimplying thermal and/or chemical reprocessing during the formation or evolution\nof the disk. We infer low ice-phase C/O ratios around 0.1 throughout the disk,\nand also demonstrate that the mixing and entrapment of disk ices can\ndramatically affect the radial dependence of the C/O ratio. It is therefore\nimperative that realistic disk ice compositions are considered when comparing\nplanetary compositions with potential formation scenarios, which will\nfortunately be possible for an increasing number of disks with JWST.","PeriodicalId":501163,"journal":{"name":"arXiv - PHYS - Instrumentation and Methods for Astrophysics","volume":"9 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"JWST ice band profiles reveal mixed ice compositions in the HH 48 NE disk\",\"authors\":\"Jennifer B. Bergner, J. A. Sturm, Elettra L. Piacentino, M. K. McClure, Karin I. Oberg, A. C. A. Boogert, E. Dartois, M. N. Drozdovskaya, H. J. Fraser, Daniel Harsono, Sergio Ioppolo, Charles J. Law, Dariusz C. Lis, Brett A. McGuire, Gary J. Melnick, Jennifer A. Noble, M. E. Palumbo, Yvonne J. Pendleton, Giulia Perotti, Danna Qasim, W. R. M. 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引用次数: 0
摘要
行星的形成受到原行星盘内挥发物成分和分布的强烈影响。利用 JWST,现在有可能获得对磁盘冰的直接观测约束,最近在冰河时代早期释放科学计划中探测到的 HH 48 NE 磁盘边缘冰吸收特征就证明了这一点。在这里,我们引入了一个新的辐射传递建模框架,旨在利用其带轮廓来检索磁盘冰的成分和混合状态,并将其应用于解释在HH 48 NE磁盘上观测到的H2O、CO2和CO冰带。我们的研究表明,这些冰在很大程度上是以混合物的形式存在的,有强有力的证据表明 H2O 和 CO2 冰中都有 CO 包裹。HH 48 NE圆盘冰的成分(纯冰与极冰与极冰部分)与早期原恒星阶段明显不同,这意味着圆盘在形成或演化过程中进行了热和/或化学再处理。我们推断整个星盘的冰相C/O比值较低,约为0.1,同时还证明了星盘冰的混合和夹带会极大地影响C/O比值的径向依赖性。因此,在比较行星成分与潜在的形成情况时,考虑现实的盘冰成分是非常重要的,幸运的是,这将有可能通过 JWST 对越来越多的盘进行研究。
JWST ice band profiles reveal mixed ice compositions in the HH 48 NE disk
Planet formation is strongly influenced by the composition and distribution
of volatiles within protoplanetary disks. With JWST, it is now possible to
obtain direct observational constraints on disk ices, as recently demonstrated
by the detection of ice absorption features towards the edge-on HH 48 NE disk
as part of the Ice Age Early Release Science program. Here, we introduce a new
radiative transfer modeling framework designed to retrieve the composition and
mixing status of disk ices using their band profiles, and apply it to interpret
the H2O, CO2, and CO ice bands observed towards the HH 48 NE disk. We show that
the ices are largely present as mixtures, with strong evidence for CO trapping
in both H2O and CO2 ice. The HH 48 NE disk ice composition (pure vs. polar vs.
apolar fractions) is markedly different from earlier protostellar stages,
implying thermal and/or chemical reprocessing during the formation or evolution
of the disk. We infer low ice-phase C/O ratios around 0.1 throughout the disk,
and also demonstrate that the mixing and entrapment of disk ices can
dramatically affect the radial dependence of the C/O ratio. It is therefore
imperative that realistic disk ice compositions are considered when comparing
planetary compositions with potential formation scenarios, which will
fortunately be possible for an increasing number of disks with JWST.