Planck-dust-allsky

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

July 2023 • 2023ApJ...951L..20C

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

Abstract • 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 μm, and with the Mid-Infrared Instrument (MIRI) from 11 to 16 μm. 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 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 0.3M 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 μm, 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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Alexandra Greenbaum

Assistant Scientist