The Astrophysical Journal Letters (Jan 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 to 16 μm

  • Aarynn L. Carter,
  • Sasha Hinkley,
  • Jens Kammerer,
  • Andrew Skemer,
  • Beth A. Biller,
  • Jarron M. Leisenring,
  • Maxwell A. Millar-Blanchaer,
  • Simon Petrus,
  • Jordan M. Stone,
  • Kimberly Ward-Duong,
  • Jason J. Wang,
  • Julien H. Girard,
  • Dean C. Hines,
  • Marshall D. Perrin,
  • Laurent Pueyo,
  • William O. Balmer,
  • Mariangela Bonavita,
  • Mickael Bonnefoy,
  • Gael Chauvin,
  • Elodie Choquet,
  • Valentin Christiaens,
  • Camilla Danielski,
  • Grant M. Kennedy,
  • Elisabeth C. Matthews,
  • Brittany E. Miles,
  • Polychronis Patapis,
  • Shrishmoy Ray,
  • Emily Rickman,
  • Steph Sallum,
  • Karl R. Stapelfeldt,
  • Niall Whiteford,
  • Yifan Zhou,
  • Olivier Absil,
  • Anthony Boccaletti,
  • Mark Booth,
  • Brendan P. Bowler,
  • Christine H. Chen,
  • Thayne Currie,
  • Jonathan J. Fortney,
  • Carol A. Grady,
  • Alexandra Z. Greebaum,
  • Thomas Henning,
  • Kielan K. W. Hoch,
  • Markus Janson,
  • Paul Kalas,
  • Matthew A. Kenworthy,
  • Pierre Kervella,
  • Adam L. Kraus,
  • Pierre-Olivier Lagage,
  • Michael C. Liu,
  • Bruce Macintosh,
  • Sebastian Marino,
  • Mark S. Marley,
  • Christian Marois,
  • Brenda C. Matthews,
  • Dimitri Mawet,
  • Michael W. McElwain,
  • Stanimir Metchev,
  • Michael R. Meyer,
  • Paul Molliere,
  • Sarah E. Moran,
  • Caroline V. Morley,
  • Sagnick Mukherjee,
  • Eric Pantin,
  • Andreas Quirrenbach,
  • Isabel Rebollido,
  • Bin B. Ren,
  • Glenn Schneider,
  • Malavika Vasist,
  • Kadin Worthen,
  • Mark C. Wyatt,
  • Zackery W. Briesemeister,
  • Marta L. Bryan,
  • Per Calissendorff,
  • Faustine Cantalloube,
  • Gabriele Cugno,
  • Matthew De Furio,
  • Trent J. Dupuy,
  • Samuel M. Factor,
  • Jacqueline K. Faherty,
  • Michael P. Fitzgerald,
  • Kyle Franson,
  • Eileen C. Gonzales,
  • Callie E. Hood,
  • Alex R. Howe,
  • Masayuki Kuzuhara,
  • Anne-Marie Lagrange,
  • Kellen Lawson,
  • Cecilia Lazzoni,
  • Ben W. P. Lew,
  • Pengyu Liu,
  • Jorge Llop-Sayson,
  • James P. Lloyd,
  • Raquel A. Martinez,
  • Johan Mazoyer,
  • Paulina Palma-Bifani,
  • Sascha P. Quanz,
  • Jea Adams Redai,
  • Matthias Samland,
  • Joshua E. Schlieder,
  • Motohide Tamura,
  • Xianyu Tan,
  • Taichi Uyama,
  • Arthur Vigan,
  • Johanna M. Vos,
  • Kevin Wagner,
  • Schuyler G. Wolff,
  • Marie Ygouf,
  • Xi Zhang,
  • Keming Zhang,
  • Zhoujian Zhang

DOI
https://doi.org/10.3847/2041-8213/acd93e
Journal volume & issue
Vol. 951, no. 1
p. L20

Abstract

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We present JWST Early Release Science coronagraphic observations of the super-Jupiter exoplanet, HIP 65426b, with the Near-Infrared Camera (NIRCam) from 2 to 5 μ m, and with the Mid-Infrared Instrument (MIRI) from 11 to 16 μ m. At a separation of ∼0.″82 (87 ${}_{-31}^{+108}$ au), HIP 65426b 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 μ m. 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 5 σ contrast limits of ∼1 × 10 ^−5 and ∼2 × 10 ^−4 at 1″ for NIRCam at 4.4 μ m and MIRI at 11.3 μ m, respectively. These contrast limits provide sensitivity to sub-Jupiter companions with masses as low as 0.3 M _Jup beyond separations of ∼100 au. Together with existing ground-based near-infrared data, the JWST photometry are fit well by a BT-SETTL atmospheric model from 1 to 16 μ m, and they span ∼97% of HIP 65426b's luminous range. Independent of the choice of model atmosphere, we measure an empirical bolometric luminosity that is tightly constrained between $\mathrm{log}\left({L}_{\mathrm{bol}}/{L}_{\odot }\right)$ = −4.31 and −4.14, which in turn provides a robust mass constraint of 7.1 ± 1.2 M _Jup . In totality, these observations confirm that JWST presents a powerful and exciting opportunity to characterize the population of exoplanets amenable to high-contrast imaging in greater detail.

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