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  • The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 Micron Spectrum of the Planetary-Mass Companion VHS 1256-1257 b
    Miles, Brittany E; Biller, Beth A; Patapis, Polychronis; Worthen, Kadin; Hoch, Kielan K W; Skemer, Andrew; Perrin, Marshall D; Whiteford, Niall; Chen, Christine H; Sargent, B; Mukherjee, Sagnick; Morley, Caroline V; Moran, Sarah E; Bonnefoy, Mickael; Simon, Petrus; Carter, Aarynn L; Choquet, Elodie; Hinkley, Sasha; Ward-Duong, Kimberly; Leisenring, Jarron M; Millar-Blanchaer, Maxwell A; Pueyo, Laurent; Shrishmoy Ray; Stapelfeldt, Karl R; Stone, Jordan M; Wang, Jason J; Absil, Olivier; Balmer, William O; Boccaletti, Anthony; Bonavita, Mariangela; Booth, Mark; Bowler, Brendan P; Chauvin, Gael; Christiaens, Valentin; Currie, Thayne; Danielski, Camilla; tney, Jonathan J; Girard, Julien H; Greenbaum, Alexandra Z; Henning, Thomas; Hines, Dean C; Janson, Markus; Kalas, Paul; Kammerer, Jens; Kenworthy, Matthew A; Kervella, Pierre; Pierre-Olivier Lagage; Lew, Ben W P; Liu, Michael C; Macintosh, Bruce; Marino, Sebastian; Marley, Mark S; Marois, Christian; Matthews, Elisabeth C; Matthews, Brenda C; Mawet, Dimitri; McElwain, Michael W; Metchev, Stanimir; Meyer, Michael R; Molliere, Paul; Pantin, Eric; Andreas Quirrenbachm Isabel Rebollido; Ren, Bin B; Vasist, Malavika; Wyatt, Mark C; Briesemeister, Zackery W; Bryan, Marta L; Calissendorff, Per; Catalloube, 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; Kraus, Adam L; Lawson, Kellen; Lazzoni, Cecilia; Liu, Pengyu; Llop-Sayson, Jorge; Lloyd, James P; Martinez, Raquel A; Mazoyer, Johan; Jea Adams Redai; Samland, Matthias; Schlieder, Joshua E; Tamura, Motohide; Tan, Xianyu; Uyama, Taichi; Vigan, Arthur; Vos, Johanna M; Wagner, Kevin; Wolff, Schuyler G; Ygouf, Marie; Zhang, Keming; Zhang, Zhoujian

    arXiv (Cornell University), 07/2024
    Paper, Journal Article

    We present the highest fidelity spectrum to date of a planetary-mass object. VHS 1256 b is a \(<\)20 M\(_\mathrm{Jup}\) widely separated (\(\sim\)8\arcsec, a = 150 au), young, planetary-mass companion that shares photometric colors and spectroscopic features with the directly imaged exoplanets HR 8799 c, 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 \textit{JWST}'s NIRSpec IFU and MIRI MRS modes for coverage from 1 \(\mu\)m to 20 \(\mu\)m at resolutions of \(\sim\)1,000 - 3,700. Water, methane, carbon monoxide, carbon dioxide, sodium, and potassium are observed in several portions of the \textit{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.

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