학술논문
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
Document Type
Working Paper
Author
Miles, Brittany E.; Biller, Beth A.; Patapis, Polychronis; Worthen, Kadin; Rickman, Emily; Hoch, Kielan K. W.; Skemer, Andrew; Perrin, Marshall D.; Whiteford, Niall; Chen, Christine H.; Mukherjee, Sagnick; Morley, Caroline V.; Moran, Sarah E.; Bonnefoy, Mickael; Petrus, Simon; Carter, Aarynn L.; Choquet, Elodie; Hinkley, Sasha; Ward-Duong, Kimberly; Leisenring, Jarron M.; Millar-Blanchaer, Maxwell A.; Pueyo, Laurent; Ray, Shrishmoy; 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; Fortney, Jonathan J.; Girard, Julien H.; Greenbaum, Alexandra Z.; Henning, Thomas; Hines, Dean C.; Janson, Markus; Kalas, Paul; Kammerer, Jens; Kenworthy, Matthew A.; Kervella, Pierre; Lagage, Pierre-Olivier; 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; Rebollido, Andreas Quirrenbachm Isabel; Ren, Bin B.; Vasist, Malavika; Wyatt, Mark C.; Zhou, Yifan; 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.; Kuzuhara, Masayuki; Lawson, Kellen; Lazzoni, Cecilia; Liu, Pengyu; Llop-Sayson, Jorge; Lloyd, James P.; Martinez, Raquel A.; Mazoyer, Johan; 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, Keming; Zhang, Zhoujian
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Abstract
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.
Comment: Accepted ApJL Iterations of spectra reduced by the ERS team are hosted at this link: https://github.com/bemiles/JWST_VHS1256b_Reduction/tree/main/reduced_spectra
Comment: Accepted ApJL Iterations of spectra reduced by the ERS team are hosted at this link: https://github.com/bemiles/JWST_VHS1256b_Reduction/tree/main/reduced_spectra