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 $μ$m
Creators: name: Carter, Aarynn L.
name: Hinkley, Sasha
name: Kammerer, Jens
name: Skemer, Andrew
name: Biller, Beth A.
name: Leisenring, Jarron M.
name: Millar-Blanchaer, Maxwell A.
name: Petrus, Simon
name: Stone, Jordan M.
name: Ward-Duong, Kimberly
name: Wang, Jason J.
name: Girard, Julien H.
name: Hines, Dean C.
name: Perrin, Marshall D.
name: Pueyo, Laurent
name: Balmer, William O.
name: Bonavita, Mariangela
name: Bonnefoy, Mickael
name: Chauvin, Gael
name: Choquet, Elodie
name: Christiaens, Valentin
name: Danielski, Camilla
name: Kennedy, Grant M.
name: Matthews, Elisabeth C.
name: Miles, Brittany E.
name: Patapis, Polychronis
name: Ray, Shrishmoy
name: Rickman, Emily
name: Sallum, Steph
name: Stapelfeldt, Karl R.
name: Whiteford, Niall
name: Zhou, Yifan
name: Absil, Olivier
name: Boccaletti, Anthony
name: Booth, Mark
name: Bowler, Brendan P.
name: Chen, Christine H.
name: Currie, Thayne
name: Fortney, Jonathan J.
name: Grady, Carol A.
name: Greenbaum, Alexandra Z.
name: Henning, Thomas
name: Hoch, Kielan K. W.
name: Janson, Markus
name: Kalas, Paul
name: Kenworthy, Matthew A.
name: Kervella, Pierre
name: Kraus, Adam L.
name: Lagage, Pierre-Olivier
name: Liu, Michael C.
name: Macintosh, Bruce
name: Marino, Sebastian
name: Marley, Mark S.
name: Marois, Christian
name: Matthews, Brenda C.
name: Mawet, Dimitri
name: McElwain, Michael W.
name: Metchev, Stanimir
name: Meyer, Michael R.
name: Molliere, Paul
name: Moran, Sarah E.
name: Morley, Caroline V.
name: Mukherjee, Sagnick
name: Pantin, Eric
name: Quirrenbach, Andreas
name: Rebollido, Isabel
name: Ren, Bin B.
name: Schneider, Glenn
name: Vasist, Malavika
name: Worthen, Kadin
name: Wyatt, Mark C.
name: Briesemeister, Zackery W.
name: Bryan, Marta L.
name: Calissendorff, Per
name: Cantalloube, Faustine
name: Cugno, Gabriele
name: De Furio, Matthew
name: Dupuy, Trent J.
name: Factor, Samuel M.
name: Faherty, Jacqueline K.
name: Fitzgerald, Michael P.
name: Franson, Kyle
name: Gonzales, Eileen C.
name: Hood, Callie E.
name: Howe, Alex R.
name: Kuzuhara, Masayuki
name: Lagrange, Anne-Marie
name: Lawson, Kellen
name: Lazzoni, Cecilia
name: Lew, Ben W. P.
name: Liu, Pengyu
name: Llop-Sayson, Jorge
name: Lloyd, James P.
name: Martinez, Raquel A.
name: Mazoyer, Johan
name: Palma-Bifani, Paulina
name: Quanz, Sascha P.
name: Redai, Jea Adams
name: Samland, Matthias
name: Schlieder, Joshua E.
name: Tamura, Motohide
name: Tan, Xianyu
name: Uyama, Taichi
name: Vigan, Arthur
name: Vos, Johanna M.
name: Wagner, Kevin
name: Wolff, Schuyler G.
name: Ygouf, Marie
name: Zhang, Xi
name: Zhang, Keming
name: Zhang, Zhoujian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $μ$m, and with the Mid-Infrared Instrument (MIRI) from 11-16 $μ$m. At a separation of $\sim$0.82" (86$^{+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 $μ$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 $\sim$1$\times10^{-5}$ and $\sim$2$\times10^{-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$M_\mathrm{Jup}$ beyond separations of $\sim$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 $μ$m, and span $\sim$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 $\mathrm{log}\!\left(L_\mathrm{bol}/L_{\odot}\right)$=-4.31 to $-$4.14, which in turn provides a robust mass constraint of 7.1$\pm$1.2 $M_\mathrm{Jup}$. 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.
description: 35 pages, 16 figures, 4 tables, 1 wonderful telescope; Submitted to AAS Journals