JWST直接观察系外行驶系统的早期发行科学计划II：行星质量伴侣VHS 1256-1257 B的1至20微米频谱

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JWST直接观察系外行驶系统的早期发行科学计划II：行星质量伴侣VHS 1256-1257 B的1至20微米频谱

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

论文作者

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., Sargent, B., 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

论文摘要

我们提出了行星质量对象迄今为止的最高保真度光谱。 VHS 1256 b是$ <$ 20 m $ _ \ mathrm {jup} $广泛分开的（$ \ sim $ 8 \ arcsec，a = 150 au），年轻的，星球质量的伴侣，共享具有光度的光度颜色和光谱特征，并与直接Im Im Imaged exoplanets HR 8799 c，d和e共享。作为L-TO-T转型对象，VHS 1256 B沿着颜色标记图的区域存在，其中实体气氛从云彩到透明。我们观察到VHS 1256〜b，\ textIt {JWST}的NIRSPEC IFU和MIRI MRS MORS模式从1 $μ$ m到20 $μ$ m，分辨率为$ \ sim $ \ sim $ 1,000-3,700。基于模板棕色矮光谱，分子不相差和大气模型的比较，在\ textit {JWST}光谱的几个部分中观察到水，甲烷，一氧化碳，二氧化碳，钠和钾。 VHS 1256 B的光谱形状受不平衡化学和云的影响。我们直接检测到硅云，这是行星质量伴侣报告的第一个此类检测。

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 $μ$m to 20 $μ$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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