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Unveiling the HD 95086 system at mid-infrared wavelengths with JWST/MIRI.

Authors :
Mâlin, Mathilde
Boccaletti, Anthony
Perrot, Clément
Baudoz, Pierre
Rouan, Daniel
Lagage, Pierre-Olivier
Waters, Rens
Güdel, Manuel
Henning, Thomas
Vandenbussche, Bart
Absil, Olivier
Barrado, David
Cossou, Christophe
Decin, Leen
Glauser, Adrian M.
Pye, John
Olofsson, Goran
Glasse, Alistair
Lahuis, Fred
Patapis, Polychronis
Source :
Astronomy & Astrophysics / Astronomie et Astrophysique. 9/26/2024, Vol. 690, p1-21. 21p.
Publication Year :
2024

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00046361
Volume :
690
Database :
Academic Search Index
Journal :
Astronomy & Astrophysics / Astronomie et Astrophysique
Publication Type :
Academic Journal
Accession number :
180523135
Full Text :
https://doi.org/10.1051/0004-6361/202450470