March
2023
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2023ApJ...946L...6M
Authors
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Miles, Brittany E.
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Biller, Beth A.
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Patapis, Polychronis
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Worthen, Kadin
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Rickman, Emily
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Hoch, Kielan K. W.
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Skemer, Andrew
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Perrin, Marshall D.
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Whiteford, Niall
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Chen, Christine H.
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Sargent, B.
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Mukherjee, Sagnick
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Morley, Caroline V.
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Moran, Sarah E.
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Bonnefoy, Mickael
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Petrus, Simon
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Carter, Aarynn L.
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Choquet, Elodie
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Hinkley, Sasha
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Ward-Duong, Kimberly
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Leisenring, Jarron M.
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Millar-Blanchaer, Maxwell A.
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Pueyo, Laurent
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Ray, Shrishmoy
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Sallum, Steph
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Stapelfeldt, Karl R.
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Stone, Jordan M.
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Wang, Jason J.
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Absil, Olivier
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Balmer, William O.
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Boccaletti, Anthony
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Bonavita, Mariangela
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Booth, Mark
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Bowler, Brendan P.
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Chauvin, Gael
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Christiaens, Valentin
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Currie, Thayne
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Danielski, Camilla
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Fortney, Jonathan J.
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Girard, Julien H.
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Grady, Carol A.
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Greenbaum, Alexandra Z.
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Henning, Thomas
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Hines, Dean C.
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Janson, Markus
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Kalas, Paul
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Kammerer, Jens
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Kennedy, Grant M.
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Kenworthy, Matthew A.
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Kervella, Pierre
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Lagage, Pierre-Olivier
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Lew, Ben W. P.
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Liu, Michael C.
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Macintosh, Bruce
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Marino, Sebastian
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Marley, Mark S.
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Marois, Christian
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Matthews, Elisabeth C.
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Matthews, Brenda C.
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Mawet, Dimitri
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McElwain, Michael W.
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Metchev, Stanimir
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Meyer, Michael R.
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Molliere, Paul
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Pantin, Eric
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Quirrenbach, Andreas
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Rebollido, Isabel
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Ren, Bin B.
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Schneider, Glenn
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Vasist, Malavika
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Wyatt, Mark C.
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Zhou, Yifan
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Briesemeister, Zackery W.
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Bryan, Marta L.
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Calissendorff, Per
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Cantalloube, Faustine
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Cugno, Gabriele
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De Furio, Matthew
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Dupuy, Trent J.
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Factor, Samuel M.
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Faherty, Jacqueline K.
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Fitzgerald, Michael P.
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Franson, Kyle
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Gonzales, Eileen C.
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Hood, Callie E.
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Howe, Alex R.
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Kraus, Adam L.
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Kuzuhara, Masayuki
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Lagrange, Anne-Marie
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Lawson, Kellen
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Lazzoni, Cecilia
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Liu, Pengyu
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Llop-Sayson, Jorge
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Lloyd, James P.
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Martinez, Raquel A.
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Mazoyer, Johan
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Quanz, Sascha P.
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Redai, Jea Adams
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Samland, Matthias
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Schlieder, Joshua E.
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Tamura, Motohide
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Tan, Xianyu
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Uyama, Taichi
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Vigan, Arthur
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Vos, Johanna M.
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Wagner, Kevin
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Wolff, Schuyler G.
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Ygouf, Marie
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Zhang, Xi
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Zhang, Keming
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Zhang, Zhoujian
Abstract
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We present the highest fidelity spectrum to date of a planetary-mass object. VHS 1256 b is a <20 M Jup 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.
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