Miles, Brittany E. and Biller, Beth A. and Patapis, Polychronis and Worthen, Kadin and Rickman, Emily and Hoch, Kielan K. W. and Skemer, Andrew and Perrin, Marshall D. and Whiteford, Niall and Chen, Christine H. and Sargent, B. and Mukherjee, Sagnick and Morley, Caroline V. and Moran, Sarah E. and Bonnefoy, Mickael and Petrus, Simon and Carter, Aarynn L. and Choquet, Elodie and Hinkley, Sasha and Ward-Duong, Kimberly and Leisenring, Jarron M. and Millar-Blanchaer, Maxwell A. and Pueyo, Laurent and Ray, Shrishmoy and Sallum, Steph and Stapelfeldt, Karl R. and Stone, Jordan M. and Wang, Jason J. and Absil, Olivier and Balmer, William O. and Boccaletti, Anthony and Bonavita, Mariangela and Booth, Mark and Bowler, Brendan P. and Chauvin, Gael and Christiaens, Valentin and Currie, Thayne and Danielski, Camilla and Fortney, Jonathan J. and Girard, Julien H. and Grady, Carol A. and Greenbaum, Alexandra Z. and Henning, Thomas and Hines, Dean C. and Janson, Markus and Kalas, Paul and Kammerer, Jens and Kennedy, Grant M. and Kenworthy, Matthew A. and Kervella, Pierre and Lagage, Pierre-Olivier and Lew, Ben W. P. and Liu, Michael C. and Macintosh, Bruce and Marino, Sebastian and Marley, Mark S. and Marois, Christian and Matthews, Elisabeth C. and Matthews, Brenda C. and Mawet, Dimitri and McElwain, Michael W. and Metchev, Stanimir and Meyer, Michael R. and Molliere, Paul and Pantin, Eric and Quirrenbach, Andreas and Rebollido, Isabel and Ren, Bin B. and Schneider, Glenn and Vasist, Malavika and Wyatt, Mark C. and Zhou, Yifan and Briesemeister, Zackery W. and Bryan, Marta L and Calissendorff, Per and Cantalloube, Faustine and Cugno, Gabriele and De Furio, Matthew and Dupuy, Trent J. and Factor, Samuel M. and Faherty, Jacqueline K. and Fitzgerald, Michael P. and Franson, Kyle and Gonzales, Eileen C. and Hood, Callie E. and Howe, Alex R. and Kraus, Adam L. and Kuzuhara, Masayuki and Lagrange, Anne-Marie and Lawson, Kellen and Lazzoni, Cecilia and Liu, Pengyu and Llop-Sayson, Jorge and Lloyd, James P. and Martinez, Raquel A. and Mazoyer, Johan and Quanz, Sascha P. and Redai, Jea Adams and Samland, Matthias and Schlieder, Joshua E. and Tamura, Motohide and Tan, Xianyu and Uyama, Taichi and Vigan, Arthur and Vos, Johanna M. and Wagner, Kevin and Wolff, Schuyler G. and Ygouf, Marie and Zhang, Xi and Zhang, Keming and Zhang, Zhoujian (2023) The JWST Early-release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 μm Spectrum of the Planetary-mass Companion VHS 1256–1257 b. The Astrophysical Journal Letters, 946 (1). L6. ISSN 2041-8205
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Abstract
We present the highest fidelity spectrum to date of a planetary-mass object. VHS 1256 b is a <20 MJup widely separated (∼8'', a = 150 au), young, planetary-mass companion that shares photometric colors and spectroscopic features with the directly imaged exoplanets HR 8799c, d, and e. As an L-to-T transition object, VHS 1256 b exists along the region of the color–magnitude diagram where substellar atmospheres transition from cloudy to clear. We observed VHS 1256 b with JWST's NIRSpec IFU and MIRI MRS modes for coverage from 1 to 20 μm at resolutions of ∼1000–3700. Water, methane, carbon monoxide, carbon dioxide, sodium, and potassium are observed in several portions of the JWST spectrum based on comparisons from template brown dwarf spectra, molecular opacities, and atmospheric models. The spectral shape of VHS 1256 b is influenced by disequilibrium chemistry and clouds. We directly detect silicate clouds, the first such detection reported for a planetary-mass companion.
| Item Type: | Article |
|---|---|
| Subjects: | Apsci Archives > Physics and Astronomy |
| Depositing User: | Unnamed user with email support@apsciarchives.com |
| Date Deposited: | 18 Apr 2023 05:21 |
| Last Modified: | 05 Feb 2024 04:44 |
| URI: | http://eprints.go2submission.com/id/eprint/737 |
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