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The JWST early release science program for direct observations of exoplanetary systems I : high contrast imaging of the exoplanet HIP 65426 b from 2-16 μm
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Carter, Aarynn and Kennedy, Grant M. (2023) The JWST early release science program for direct observations of exoplanetary systems I : high contrast imaging of the exoplanet HIP 65426 b from 2-16 μm. Astrophysical Journal Letters, 951 (1). L20. doi:10.3847/2041-8213/acd93e ISSN 2041-8213.
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Official URL: https://doi.org/10.3847/2041-8213/acd93e
Abstract
We present JWST Early Release Science (ERS) coronagraphic observations of the super-Jupiter exoplanet, HIP 65426 b, with the Near-Infrared Camera (NIRCam) from 2-5 μm, and with the Mid-Infrared Instrument (MIRI) from 11-16 μm. At a separation of ∼0.82" (86+116−31 au), HIP 65426 b is clearly detected in all seven of our observational filters, representing the first images of an exoplanet to be obtained by JWST, and the first ever direct detection of an exoplanet beyond 5 μm. These observations demonstrate that JWST is exceeding its nominal predicted performance by up to a factor of 10, depending on separation and subtraction method, with measured 5σ contrast limits of ∼1×10−5 and ∼2×10−4 at 1" for NIRCam at 4.4 μm and MIRI at 11.3 μm, respectively. These contrast limits provide sensitivity to sub-Jupiter companions with masses as low as 0.3MJup beyond separations of ∼100 au. Together with existing ground-based near-infrared data, the JWST photometry are well fit by a BT-SETTL atmospheric model from 1-16 μm, and span ∼97% of HIP 65426 b's luminous range. Independent of the choice of model atmosphere we measure an empirical bolometric luminosity that is tightly constrained between log(Lbol/L⊙)=-4.31 to −4.14, which in turn provides a robust mass constraint of 7.1±1.2 MJup. In totality, these observations confirm that JWST presents a powerful and exciting opportunity to characterise the population of exoplanets amenable to high-contrast imaging in greater detail.
Item Type: | Journal Article | ||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Extrasolar planets, Astronomical photometry, Extrasolar planets -- Atmospheres | ||||||||||||||||||||||||
Journal or Publication Title: | Astrophysical Journal Letters | ||||||||||||||||||||||||
Publisher: | IOP Publishing Ltd | ||||||||||||||||||||||||
ISSN: | 2041-8213 | ||||||||||||||||||||||||
Official Date: | 6 July 2023 | ||||||||||||||||||||||||
Dates: |
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Volume: | 951 | ||||||||||||||||||||||||
Number: | 1 | ||||||||||||||||||||||||
Article Number: | L20 | ||||||||||||||||||||||||
DOI: | 10.3847/2041-8213/acd93e | ||||||||||||||||||||||||
Institution: | University of Warwick | ||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||
Description: | Full author list available from publisher |
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Date of first compliant deposit: | 12 September 2023 | ||||||||||||||||||||||||
Date of first compliant Open Access: | 12 September 2023 | ||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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