Strong Hα emission and signs of accretion in a circumbinary planetary mass companion from MUSE
Strong Hα emission and signs of accretion in a circumbinary planetary mass companion from MUSE
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来自 MUSE 的环绕双星质量伴星的强烈 Hα 发射和吸积迹象
DOI：
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发表时间：
2020
影响因子：
6.5
通讯作者：
S. Petrus
中科院分区：
文献类型：
--
作者：
S. Eriksson;R. A. Torres;M. Janson;Y. Aoyama;G. Marleau;M. Bonnefoy;S. Petrus
上下文本征Hα发射可以有利地用于探测亚恒星伴星，因为它可以提高直接成像的对比度。描述这种来自吸积系外行星的排放可以测试行星形成理论。
目标。我们通过中等分辨率光谱学对年轻的环双星行星质量伴星2 MASS J 01033563 -5515561（AB）B（Delorme 1（AB）B）进行了光谱学研究。
方法.在科学验证期间，我们将新的窄场模式用于位于ESO甚大望远镜上的MUSE积分场摄谱仪，以获得Delorme 1（AB）B的光谱。
结果我们发现了很强的Hα和Hβ发射，并伴有He I发射。这与活跃的吸积情景相一致。我们提供了从几种独立方法获得的吸积率估计，并发现Delorme 1（AB）B的可能质量为12−15 MJup。这也与先前的估计一致。
结论. Delorme 1系统中活跃的吸积迹象可能表明它的年龄比THA（Tucana-Horologium）中可能的成员所预期的3000万年至4000万年更年轻。先前的研究也显示中央双星过于明亮，这进一步表明它的年龄更小。然而，最近在相对古老（约4000万年）的低质量系统中发现的活跃盘表明，Delorme 1（AB）B中正在进行的吸积可能本身并不要求系统比THA成员所暗示的年龄更年轻。
Context. Intrinsic Hα 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 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 Hα and Hβ 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 MJup 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 ∼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 (∼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.
DOI：
10.3847/2041-8213/ab2a12
发表时间：
2019-06
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
A. Isella;M. Benisty;R. Teague;J. Bae;M. Keppler;S. Facchini;L. P'erez
通讯作者：
A. Isella;M. Benisty;R. Teague;J. Bae;M. Keppler;S. Facchini;L. P'erez