Year: 2024
Type: article
Abstract: 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 RJup 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.
Authors: Mathilde Mâlin, Anthony Boccaletti, Clément Perrot, Pierre Baudoz, Daniel Rouan, Pierre-Olivier Lagage, Rens Waters, Manuel Güdel, Thomas Henning, Bart Vandenbussche, Olivier Absil, David Barrado, Christophe Cossou, Leen Decin, Adrian M. Glauser, John Pye, Goran Olofsson, Alistair Glasse, Fred Lahuis, Polychronis Patapis, Pierre Royer, Silvia Scheithauer, Niall Whiteford, Eugene Serabyn, Elodie Choquet, Luis Colina, Göran Ostlin, Tom P. Ray, Gillian Wright
Institutions: Centre National de la Recherche Scientifique, Observatoire de Paris, Sorbonne Université, Sorbonne Paris Cité, Laboratoire d’études spatiales et d’instrumentation en astrophysique, Université Paris Cité, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Astrophysique, Instrumentation et Modélisation, Radboud University Nijmegen, Space Research Organisation Netherlands, Max Planck Institute for Astronomy, KU Leuven, University of Liège, Centro de Astrobiología, CEA Paris-Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, ETH Zurich, Institute for Particle Physics and Astrophysics, University of Leicester, Stockholm University, AlbaNova, Royal Observatory, UK Astronomy Technology Centre, American Museum of Natural History, California Institute of Technology, Jet Propulsion Laboratory, Aix-Marseille Université, Dublin Institute For Advanced Studies
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, Space Telescope Science Institute, European Space Agency, European Commission, National Research Foundation, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Danmarks Grundforskningsfond, Swedish National Space Agency, Fonds De La Recherche Scientifique - FNRS, Belgian Federal Science Policy Office, Centre National d’Etudes Spatiales, Fonds Wetenschappelijk Onderzoek, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, KU Leuven, Knut och Alice Wallenbergs Stiftelse, Ministerio de Ciencia e Innovación, Max-Planck-Institut für Astronomie, Jet Propulsion Laboratory, Horizon 2020 Framework Programme, Science and Technology Facilities Council, Agencia Estatal de Investigación
Awards: G103270039, G1175115578, Studien zum Notariat in Lucca im 13. Jahrhundert., G121809054, G1276317268, G1320060331, G1338664626, G1594096898, G1855990336, G2001806450, G210041235, G2188020438, G2262748287, G2309174360, G2350454921, G256731684, G2601397997, G2660406951, G2676722403, G279363373, G2945112853, G300979063, G3250484376, Virtual Laboratories for Exoplanets and Planet Forming Disks, G3345895242, G3401686495, G34346518, G3452655474, G3457489054, G3480869486, G3648211085, G3681454997, G3690828678, G3910197854, G4042783231, Exoplanet Athmosphere New Emission Transmission Spectra Analysis, G425668148, G430777504, G434337789, G4367447019, G4484233699, Characterisation of the effect of stellar variability on exoplanet signatures, G4937468798, G5080475149, G5145896149, G5175525644, G5180915604, G5195188938, G5392910068, G5421974903, G5568641063, G5721199125, G5805502524, G5972664074, G6085756319, G6281504974, G6576599148, G6638315758, G6779418066, G683931746, G6890900265, G7084143925, G712556587, Constraining gas giant planet formation via high-contrast exoplanet imaging, G751615522, VLSI-Systeme mit optischen Verbindungen - Vorstudie der technologischen Machbarkeit -, G7628805400, G7984235579, G830101876, G8512683158, G8638682022, G8684520763, G897484643, G99296377
OpenAlex ID: W6903411124
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