TY - JOUR
T1 - Unveiling the HD 95086 system at mid-infrared wavelengths with JWST/MIRI
AU - Mâlin, Mathilde
AU - Boccaletti, Anthony
AU - Perrot, Clément
AU - Baudoz, Pierre
AU - Rouan, Daniel
AU - Lagage, Pierre Olivier
AU - Waters, Rens
AU - Güdel, Manuel
AU - Henning, Thomas
AU - Vandenbussche, Bart
AU - Absil, Olivier
AU - Barrado, David
AU - Cossou, Christophe
AU - Decin, Leen
AU - Glauser, Adrian M.
AU - Pye, John
AU - Olofsson, Goran
AU - Glasse, Alistair
AU - Lahuis, Fred
AU - Patapis, Polychronis
AU - Royer, Pierre
AU - Scheithauer, Silvia
AU - Whiteford, Niall
AU - Serabyn, Eugene
AU - Choquet, Elodie
AU - Colina, Luis
AU - Ostlin, Göran
AU - Ray, Tom P.
AU - Wright, Gillian
N1 - Publisher Copyright:
© The Authors 2024.
PY - 2024/10/1
Y1 - 2024/10/1
N2 - 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 800a1050 K, consistent with one previous hypothesis that only used near-infrared data. The radius measurement of 1.0a1.14 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.
AB - 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 800a1050 K, consistent with one previous hypothesis that only used near-infrared data. The radius measurement of 1.0a1.14 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.
KW - Infrared: planetary systems
KW - Methods: observational
KW - Planets and satellites: Atmospheres
UR - http://www.scopus.com/inward/record.url?scp=85207355235&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/202450470
DO - 10.1051/0004-6361/202450470
M3 - Article
AN - SCOPUS:85207355235
SN - 0004-6361
VL - 690
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A316
ER -