论文标题
2MASS J15491331-3539118：GQ LUP系统的新的低质量范围
2MASS J15491331-3539118: a new low-mass wide companion of the GQ Lup system
论文作者
论文摘要
在恒星周围宽分离的近距离伴侣托管行星或棕色矮人（BD）却足够近，足以使其在情节光盘中形成。在这封信中，我们报告了GQ LUP A-B系统的宽（投影分离$ \ sim $ 16.0arcsec或2400 au，以及位置角度114.61 $^\ circ $）的伴侣，很可能在重力上绑定。 VLT/X射击器频谱表明，这颗星，2级J15491331-3539118，是一个真正的低质量（$ \ sim $ \ sim $ 0.15 m $ $ _ \ odot $）年轻的恒星对象（yso），具有恒定的lupus ys-ys-ys ys的典型属性，以及与lup ys ys ys s lup and s lup and s lup and s lup and s lup。 系统。形成三重系统的一种可能的情况是，GQ LUP A和2MASS J15491331-3539118是由lup I细丝中动荡的核心碎片形成而形成的，而GQ Lup B（GQ Lup B），BD的BD伴侣GQ LUP A的bd同伴在0.7arcsec中，由0.7arcsec，由0.7arcsec形成，由散布的discrimation discrimation discrimation dickation discrimation discrimation。沿云丝丝形成恒星的最新发现将有利于湍流碎片化的情况，以形成GQ LUP A和2MASS J15491331-3539118。
Substellar companions at wide separation around stars hosting planets or brown dwarfs (BDs) yet close enough for their formation in the circumstellar disc are of special interest. In this letter we report the discovery of a wide (projected separation $\sim$16.0arcsec, or 2400 AU, and position angle 114.61$^\circ$) companion of the GQ Lup A-B system, most likely gravitationally bound to it. A VLT/X-Shooter spectrum shows that this star, 2MASS J15491331-3539118, is a bonafide low-mass ($\sim$0.15 M$_\odot$) young stellar object (YSO) with stellar and accretion/ejection properties typical of Lupus YSOs of similar mass, and with kinematics consistent with that of the GQ Lup A-B system. A possible scenario for the formation of the triple system is that GQ Lup A and 2MASS J15491331-3539118 formed by fragmentation of a turbulent core in the Lup I filament, while GQ Lup B, the BD companion of GQ Lup A at 0.7arcsec, formed in situ by the fragmentation of the circumprimary disc. The recent discoveries that stars form along cloud filaments would favour the scenario of turbulent fragmentation for the formation of GQ Lup A and 2MASS J15491331-3539118.
