JWST promises to be the most versatile infrared observatory in the next two decades. The Near Infrared and Slitless Spectrograph (NIRISS) instrument, when operated in Aperture Masking Interferometry (AMI) mode, will provide an unparalleled combination of angular resolution and sensitivity compared to any existing observatory at mid-infrared wavelengths.
Using simulated observations combined with evolutionary models, we present the ability of this mode to image planetary-mass companions around nearby stars at close orbital distances near the circumstellar water frost line for members of the young, kinematically moving groups Beta Pictoris , TW Hydrae, as well as the Taurus-Auriga association.
We show that for properly chosen stars JWST/NIRISS operating in AMI mode can image sub-Jupiter companions near the water frost lines with ~68% confidence. Of these, M-type stars are the most promising.
We also show that this JWST mode will improve the minimum interior angle by as much as ~50% in most cases compared to the research results of the best ground-based exoplanet imaging facilities (e.g. VLT/SPHERE). We also discuss how the NIRISS/AMI mode will be particularly powerful for the mid-infrared characterization of the numerous exoplanets expected to be revealed by Gaia.
Combined with Gaia’s dynamical masses, such measurements will provide a much more robust characterization of the initial entropy of these young planets, placing powerful constraints on their early thermal histories.
Shrishmoy Ray, Sasha Hinkley, Steph Sallum, Mariangela Bonavita, Vito Squicciarini, Aarynn L. Carter, Cecilia Lazzoni
Notes: 19 pages, 13 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society
Topics: Earth and planetary astrophysics (astroph.EP); Instrumentation and Methods for Astrophysics (astroph.IM)
Listed as: arXiv:2211.09830 [astro-ph.EP] (or arXiv:2211.09830v1 [astro-ph.EP] for this version)
Focus to learn more
From: Shrishmoy Ray
[v1] Thu 17 Nov 2022 19:00:11 UTC (7,583 KB)