methods: observational; planets and satellites: atmospheres; infrared: planetary systems
Abstract :
[en] Context. Mid-infrared imaging of exoplanets and disks is now possible with the coronographs of the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST). This wavelength range unveils new features of young directly imaged systems and allows us to obtain new constraints for characterizing the atmosphere of young giant exoplanets and associated disks. Aims. These observations aim to characterize the atmosphere of the planet HD 95086 b by adding mid-infrared information so that the various hypotheses about its atmospheric parameters values can be unraveled. Improved images of cirsumstellar disks are provided. Methods. We present the MIRI coronagraphic imaging of the system HD 95086 obtained with the F1065C, F1140, and F2300C filters at central wavelengths of 10.575 µm, 11.3 µm, and 23 µm, respectively. We explored the method for subtracting the stellar diffraction pattern in the particular case when bright dust emitting at short separation is present. Furthermore, we compared different methods for extracting the photometry of the planet. Using the atmospheric models Exo-REM and ATMO, we measured the atmospheric parameters of HD 95086 b. Results. The planet HD 95086 b is detected at the two shortest MIRI wavelengths F1065C and F1140C. The contribution from the inner disk of the system is also detected. It is similar to that in the HR 8799 system. The outer colder belt is imaged at 23 µm. Background objects are observed in all filters. The mid-infrared photometry provides better constraints on the atmospheric parameters. We evaluate a temperature of 800–1050 K, consistent with one previous hypothesis that only used near-infrared data. The radius measurement of 1.0–1.14 R<SUB>Jup</SUB> is better aligned with evolutionary models, but still smaller than predicted. These observations allow us to refute the hypothesis of a warm circumplanetary disk. Conclusions. HD 95086 is one of the first exoplanetary systems to be revealed at mid-infrared wavelengths. This highlights the interests and challenges of observations at these wavelengths.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Mâlin, Mathilde; Observatoire de Paris, Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, Space Telescope Science Institute, Baltimore, Maryland, Johns Hopkins University, Department of Physics and Astronomy
Boccaletti, Anthony; Observatoire de Paris, Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique
Perrot, Clément; Observatoire de Paris, Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique
Baudoz, Pierre; Observatoire de Paris, Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique
Rouan, Daniel; Observatoire de Paris, Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique
Lagage, Pierre-Olivier; CEA Saclay, Service d'Astrophysique
Waters, Rens; Radboud University Nijmegen, Department of Astronomy and Physics, Netherlands Institute for Space Research
Güdel, Manuel; University of Vienna, Department of Astronomy, Max-Planck-Institute for Astronomy, Heidelberg, ETH Zurich, Department of Physics
Henning, Thomas; Max-Planck-Institute for Astronomy, Heidelberg
Vandenbussche, Bart; Katholieke University of Leuven, Astronomical Institute
Absil, Olivier ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Barrado, David; Center for Astrobiology, Madrid
Cossou, Christophe; Institut de Recherche sur les Lois Fondamentales de l'Universe
Decin, Leen; Katholieke University of Leuven, Astronomical Institute
Glauser, Adrian M.; ETH Zurich, Department of Physics
Pye, John; School of Physics &, Astronomy, Space Park Leicester, University of Leicester, 92 Corporation Road, Leicester, LE4 5SP, UK
Olofsson, Goran; AlbaNova University Center
Glasse, Alistair; Royal Observatory Edinburgh
Lahuis, Fred; Netherlands Institute for Space Research
Patapis, Polychronis; ETH Zurich, Department of Physics
Royer, Pierre; Katholieke University of Leuven, Astronomical Institute
Scheithauer, Silvia; Max-Planck-Institute for Astronomy, Heidelberg
Whiteford, Niall; American Museum of Natural History, New York
H2020 - 101019751 - MOLDISK - Linking chemistry and physics in the planet-forming zones of disks H2020 - 743029 - EASY - Ejection Accretion Structures in YSOs (EASY)
Funders :
ERC - European Research Council BELSPO - Belgian Federal Science Policy Office F.R.S.-FNRS - Fonds de la Recherche Scientifique European Union
Commentary :
Copyright ESO 2024, published by EDP Sciences - https://www.aanda.org/articles/aa/full_html/2024/10/aa50470-24/aa50470-24.html
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