论文标题
强烈的h $α$排放和在缪斯的环形行星群众中的积聚迹象
Strong H$α$ emission and signs of accretion in a circumbinary planetary mass companion from MUSE
论文作者
论文摘要
语境。固有的H $α$发射可有利地用于检测近代伴侣，因为它可以改善直接成像中的对比度。从积聚外行星中表征这种发射可以测试行星形成理论。 目标。我们表征了年轻的环形行星质量伴侣2 Mass J01033563-5515561（AB）B（Delorme 1（AB）B）通过中分辨率光谱法。 方法。在科学验证时间内，我们使用了位于ESO非常大的望远镜上的Muse Integralliend光谱仪的新型窄场模式（NFM），以获得Delorme 1（AB）b的光谱。 结果。我们报告发现非常强大的H $α$和H $β$排放，并伴随着我的排放。这与主动积聚方案一致。我们提供从几种独立方法获得的增值率估计值，并发现Delorme 1（AB）b的质量可能为$ 12-15 $ m $ _ {\ rm jup} $。这也与以前的估计相一致。 结论。 Delorme 1系统中积极积聚的迹象可能表明年龄比$ \ sim 30-40 $ MYR年龄年轻，可能会受到图卡纳州立大学（THA）会员资格的预期。先前的作品还表明，中央二元是过度的，这进一步表明了年龄较小。但是，在相对较旧的（$ \ sim 40 $ myr）中，最近发现的活跃光盘的发现非常低，这表明在Delorme 1（AB）B中的持续积聚可能不需要，并且本身本身不需要该系统比其成员所暗示的年龄还年轻。
Context. Intrinsic H$α$ emission can be advantageously used to detect substellar companions because it improves contrasts in direct imaging. Characterising this emission from accreting exoplanets allows for the testing of planet formation theories. Aims. We characterise the young circumbinary planetary mass companion 2MASS J01033563-5515561 (AB)b (Delorme 1 (AB)b) through medium-resolution spectroscopy. Methods. We used the new narrow-field mode (NFM) for the MUSE integral-field spectrograph, located on the ESO Very Large Telescope, during science verification time to obtain optical spectra of Delorme 1 (AB)b. Results. We report the discovery of very strong H$α$ and H$β$ emission, accompanied by He I emission. This is consistent with an active accretion scenario. We provide accretion rate estimates obtained from several independent methods and find a likely mass of $12-15$ M$_{\rm Jup}$ for Delorme 1 (AB)b. This is also consistent with previous estimates. Conclusions. Signs of active accretion in the Delorme 1 system might indicate a younger age than the $\sim 30-40$ Myr expected from a likely membership in Tucana-Horologium (THA). Previous works have also shown the central binary to be overluminous, which gives further indication of a younger age. However, recent discoveries of active discs in relatively old ($\sim 40$ Myr), very low-mass systems suggests that ongoing accretion in Delorme 1 (AB)b might not require in and of itself that the system is younger than the age implied by its THA membership.
