First Observations of the Brown Dwarf HD 19467 B with JWST-猫眼课题宝

DOI：

10.3847/1538-4357/acb68b

发表时间：

2023-01

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

A. Greenbaum;Jorge Llop-Sayson;Ben W. P. Lew;G. Bryden;T. Roellig;M. Ygouf;B. Fulton;D. Hey;D. Huber;S. Mukherjee;M. Meyer;J. Leisenring;M. Rieke;M. Boyer;J. Green;Doug Kelly;K. Misselt;E. Serabyn;J. Stansberry;L. Chu;Matthew De Furio;D. Johnstone;J. Schlieder;C. Beichman

我们用JWST的NIRCam在6个滤光片中用长波长条冠仪观测了HD 19467 B，范围为2.5-4.6μm。褐矮星HD 19467 B最初是通过G3V恒星HD 19467的径向速度的长周期趋势来识别的。HD 19467 B随后通过日冕摄影成像和光谱学被探测到，并被描述为一颗温度约为∼1000K的T型晚期褐矮星。作为NIRCam GTO科学计划的一部分，我们观测到了HD 19467 B，展示了NIRCam长波长条日冕摄影面罩的首次使用。在所有六个滤光片(对比度级别为2×10−4至2×10−5)中，使用角度差成像和合成参考差成像以1.“6的间隔检测对象。由于在获取预选参考星期间出现导航星故障，没有参考星数据可用于后处理。然而，使用从望远镜光学结构的同期地图开发的合成点扩展函数，参考差分成像被成功地应用。附加的径向速度数据(来自Keck/HiRes)被用来约束HD 19467 B的轨道。来自TESS的光度数据被用来约束主星的性质，特别是它的年龄。利用文献中的NIRCam测光、光谱和测光技术，以及改进的恒星参数，结合最新的光谱和演化亚恒星模型来推导HD 19467 B的物理性质。利用光谱学、Gaia天体测量和TESS星震学的9.4±0.9Gyr年龄，我们得到了62±1MJ的模型导出质量，这在2σ内与81−12+14MJ的动态导出质量是一致的。

We observed HD 19467 B with JWST’s NIRCam in six filters spanning 2.5–4.6 μm with the long-wavelength bar coronagraph. The brown dwarf HD 19467 B was initially identified through a long-period trend in the radial velocity of the G3V star HD 19467. HD 19467 B was subsequently detected via coronagraphic imaging and spectroscopy, and characterized as a late-T type brown dwarf with an approximate temperature ∼1000 K. We observed HD 19467 B as a part of the NIRCam GTO science program, demonstrating the first use of the NIRCam Long Wavelength Bar coronagraphic mask. The object was detected in all six filters (contrast levels of 2 × 10−4 to 2 × 10−5) at a separation of 1.″6 using angular differential imaging and synthetic reference differential imaging. Due to a guide star failure during the acquisition of a preselected reference star, no reference star data were available for post-processing. However, reference differential imaging was successfully applied using synthetic point-spread functions developed from contemporaneous maps of the telescope’s optical configuration. Additional radial velocity data (from Keck/HIRES) are used to constrain the orbit of HD 19467 B. Photometric data from TESS are used to constrain the properties of the host star, particularly its age. NIRCam photometry, spectra, and photometry from the literature, and improved stellar parameters are used in conjunction with recent spectral and evolutionary substellar models to derive the physical properties of HD 19467 B. Using an age of 9.4 ± 0.9 Gyr inferred from spectroscopy, Gaia astrometry, and TESS asteroseismology, we obtain a model-derived mass of 62 ± 1 M J, which is consistent within 2σ with the dynamically derived mass of 81−12+14 M J.

First Observations of the Brown Dwarf HD 19467 B with JWST

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