DIRECT IMAGING OF A COLD JOVIAN EXOPLANET IN ORBIT AROUND THE SUN-LIKE STAR GJ 504-猫眼课题宝

DOI：

10.1088/0004-637x/774/1/11

发表时间：

2013-07

期刊：

The Astrophysical Journal

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通讯作者：

中科院分区：

其他

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作者：

M. Kuzuhara;M. Kuzuhara;Motohide Tamura;Motohide Tamura;T. Kudo;M. Janson;R. Kandori;Timothy D. Brandt;C. Thalmann;D. Spiegel;B. Biller;J. Carson;Y. Hori;R. Suzuki;Adam Burrows;T. Henning;E. Turner;E. Turner;M. McElwain;A. Moro-Mart́in;A. Moro-Mart́in;T. Suenaga;Yasuhiro H. Takahashi;J. Kwon;P. Lucas;L. Abe;W. Brandner;S. Egner;M. Feldt;H. Fujiwara;M. Goto;C. Grady;O. Guyon;J. Hashimoto;Y. Hayano;M. Hayashi;S. Hayashi;K. Hodapp;M. Ishii;M. Iye;G. Knapp;T. Matsuo;S. Mayama;S. Miyama;J. Morino;J. Nishikawa;T. Nishimura;T. Kotani;N. Kusakabe;T. Pyo;E. Serabyn;H. Suto;M. Takami;N. Takato;H. Terada;D. Tomono;M. Watanabe;J. Wisniewski;Toru Yamada;H. Takami;T. Usuda

最近几颗系外行星的影像显示，它们与母恒星的距离大于10 Au。它们的年龄跨度有限（0.5等），意味着厚厚的云层覆盖。此外，由于形成时的未知初始条件，在这些年轻的年龄存在大量的模型不确定性，这可能导致建模行星质量的数量级不确定性。在这里，我们报告的直接成像发现木星系外行星周围的太阳一样的星星GJ 504，检测作为SEEDS调查的一部分。该系统比所有其他已知的直接成像行星都要古老;因此，它的估计质量仍然处于行星状态，与系外行星建模中初始条件选择相关的不确定性无关。使用最常见的系外行星冷却模型，并考虑到系统年龄为1.6亿年，GJ 504 b的质量估计为4个木星质量，是直接成像的行星中最小的。它的43.5 Au的预测分离超过了典型的外边界30 Au预测的核心吸积机制。GJ 504 b的温度也比之前拍摄的系外行星低得多（510 K），颜色也比之前拍摄的系外行星更蓝（J-H =-0.23等），这表明它的大气层基本上没有云，可以进行光谱表征。因此，它有可能为巨行星的起源及其大气特性提供新的见解。

Several exoplanets have recently been imaged at wide separations of >10 AU from their parent stars. These span a limited range of ages ( 0.5 mag), implying thick cloud covers. Furthermore, substantial model uncertainties exist at these young ages due to the unknown initial conditions at formation, which can lead to an order of magnitude of uncertainty in the modeled planet mass. Here, we report the direct-imaging discovery of a Jovian exoplanet around the Sun-like star GJ 504, detected as part of the SEEDS survey. The system is older than all other known directly imaged planets; as a result, its estimated mass remains in the planetary regime independent of uncertainties related to choices of initial conditions in the exoplanet modeling. Using the most common exoplanet cooling model, and given the system age of 160 Myr, GJ 504b has an estimated mass of 4 Jupiter masses, among the lowest of directly imaged planets. Its projected separation of 43.5 AU exceeds the typical outer boundary of ∼30 AU predicted for the core accretion mechanism. GJ 504b is also significantly cooler (510 K) and has a bluer color (J − H = −0.23 mag) than previously imaged exoplanets, suggesting a largely cloud-free atmosphere accessible to spectroscopic characterization. Thus, it has the potential of providing novel insights into the origins of giant planets as well as their atmospheric properties.

DIRECT IMAGING OF A COLD JOVIAN EXOPLANET IN ORBIT AROUND THE SUN-LIKE STAR GJ 504

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