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Direct Imaging And Spectroscopy Of A Planetary-mass Candidate Companion To A Young Solar Analog

机译:行星质量候选伴星与年轻太阳类似物的直接成像和光谱学

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摘要

We present Gemini near-infrared adaptive optics imaging and spectroscopy of a planetary-mass candidate companion to 1RXS J160929.1-210524, a roughly solar-mass member of the 5 Myr old Upper Scorpius association. The object, separated by 2.22" or 330 AU at ~150 pc, has infrared colors and spectra suggesting a temperature of 1800~(+200)_(-100) K, and spectral type of L4~(+1)_(-2). The H- and K-band spectra provide clear evidence of low surface gravity, and thus youth. Based on the widely used DUSTY models, we infer a mass of 8~(+4)_(-2) M_(jup). If gravitationally bound, this would be the lowest mass companion imaged around a normal star thus far, and its existence at such a large separation would pose a serious challenge to theories of star and planet formation.
机译:我们向1RXS J160929.1-210524(约5 Myr的上天蝎座协会的大致太阳质量成员)展示双子座行星候选伴星的双子座近红外自适应光学成像和光谱学。该物体在〜150 pc处被2.22“或330 AU隔开,具有红外颜色和光谱,表明温度为1800〜(+200)_(-100)K,光谱类型为L4〜(+1)_(- 2)。H波段和K波段的光谱清楚地表明了低地心引力,因此很年轻,根据广泛使用的DUSTY模型,我们推断出质量为8〜(+4)_(-2)M_(jup )。如果受到引力的约束,这将是迄今为止在正常恒星周围成像的质量最低的同伴,而且它在如此大的间隔内的存在将对恒星和行星形成理论提出严峻挑战。

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