Julie Inglis, Natasha E. Batalha, Nikole K. Lewis, Tiffany Kataria, Heather A. Knutson, Brian M. Kilpatrick, Anna Gagnebin, Sagnick Mukherjee, Maria M. Pettyjohn, Ian J. M. Crossfield, Trevor O. Foote, David Grant, Gregory W. Henry, Maura Lally, Laura K. McKemmish, David K. Sing, Hannah R. Wakeford, Juan C. Zapata Trujillo, Robert T. Zellem
{"title":"Quartz Clouds in the Dayside Atmosphere of the Quintessential Hot Jupiter HD 189733 b","authors":"Julie Inglis, Natasha E. Batalha, Nikole K. Lewis, Tiffany Kataria, Heather A. Knutson, Brian M. Kilpatrick, Anna Gagnebin, Sagnick Mukherjee, Maria M. Pettyjohn, Ian J. M. Crossfield, Trevor O. Foote, David Grant, Gregory W. Henry, Maura Lally, Laura K. McKemmish, David K. Sing, Hannah R. Wakeford, Juan C. Zapata Trujillo, Robert T. Zellem","doi":"arxiv-2409.11395","DOIUrl":null,"url":null,"abstract":"Recent mid-infrared observations with JWST/MIRI have resulted in the first\ndirect detections of absorption features from silicate clouds in the\ntransmission spectra of two transiting exoplanets, WASP-17 b and WASP-107 b. In\nthis paper, we measure the mid-infrared ($5-12$ $\\mu$m) dayside emission\nspectrum of the benchmark hot Jupiter HD 189733 b with MIRI LRS by combining\ndata from two secondary eclipse observations. We confirm the previous detection\nof H$_2$O absorption at 6.5 $\\mu$m from Spitzer/IRS and additionally detect\nH$_2$S as well as an absorption feature at 8.7 $\\mu$m in both secondary eclipse\nobservations. The excess absorption at 8.7 $\\mu$m can be explained by the\npresence of small ($\\sim$0.01 $\\mu$m) grains of SiO$_2$[s] in the uppermost\nlayers of HD 189733 b's dayside atmosphere. This is the first direct detection\nof silicate clouds in HD 189733 b's atmosphere, and the first detection of a\ndistinct absorption feature from silicate clouds on the day side of any hot\nJupiter. We find that models including SiO$_2$[s] are preferred by $6-7\\sigma$\nover clear models and those with other potential cloud species. The high\naltitude location of these silicate particles is best explained by formation in\nthe hottest regions of HD 189733 b's dayside atmosphere near the substellar\npoint. We additionally find that HD 189733 b's emission spectrum longward of 9\n$\\mu$m displays residual features not well captured by our current atmospheric\nmodels. When combined with other JWST observations of HD 189733 b's\ntransmission and emission spectrum at shorter wavelengths, these observations\nwill provide us with the most detailed picture to date of the atmospheric\ncomposition and cloud properties of this benchmark hot Jupiter.","PeriodicalId":501209,"journal":{"name":"arXiv - PHYS - Earth and Planetary Astrophysics","volume":"47 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Earth and Planetary Astrophysics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.11395","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Recent mid-infrared observations with JWST/MIRI have resulted in the first
direct detections of absorption features from silicate clouds in the
transmission spectra of two transiting exoplanets, WASP-17 b and WASP-107 b. In
this paper, we measure the mid-infrared ($5-12$ $\mu$m) dayside emission
spectrum of the benchmark hot Jupiter HD 189733 b with MIRI LRS by combining
data from two secondary eclipse observations. We confirm the previous detection
of H$_2$O absorption at 6.5 $\mu$m from Spitzer/IRS and additionally detect
H$_2$S as well as an absorption feature at 8.7 $\mu$m in both secondary eclipse
observations. The excess absorption at 8.7 $\mu$m can be explained by the
presence of small ($\sim$0.01 $\mu$m) grains of SiO$_2$[s] in the uppermost
layers of HD 189733 b's dayside atmosphere. This is the first direct detection
of silicate clouds in HD 189733 b's atmosphere, and the first detection of a
distinct absorption feature from silicate clouds on the day side of any hot
Jupiter. We find that models including SiO$_2$[s] are preferred by $6-7\sigma$
over clear models and those with other potential cloud species. The high
altitude location of these silicate particles is best explained by formation in
the hottest regions of HD 189733 b's dayside atmosphere near the substellar
point. We additionally find that HD 189733 b's emission spectrum longward of 9
$\mu$m displays residual features not well captured by our current atmospheric
models. When combined with other JWST observations of HD 189733 b's
transmission and emission spectrum at shorter wavelengths, these observations
will provide us with the most detailed picture to date of the atmospheric
composition and cloud properties of this benchmark hot Jupiter.