The CARMENES search for exoplanets around M dwarfs A long-period planet around GJ 1151 measured with CARMENES and HARPS-N data
The CARMENES search for exoplanets around M dwarfs A long-period planet around GJ 1151 measured with CARMENES and HARPS-N data
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CARMENES 搜索 M 矮星周围的系外行星 使用 CARMENES 和 HARPS-N 数据测量的 GJ 1151 周围的长周期行星
DOI：
10.1051/0004-6361/202245053
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发表时间：
2023
影响因子：
6.5
通讯作者：
Blanco-Pozo J
中科院分区：
文献类型：
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作者：
Blanco-Pozo J
通过与宿主星星相互作用产生的无线电辐射来探测短周期轨道上的行星伴星是系外行星科学的一个新的前景。最近，我们利用LOFAR观测在低质量恒星系统GJ 1151附近发现了一个诱人的信号。目的我们研究了GJ 1151的光谱时间序列数据，以寻找行星伴星，研究恒星磁活动的可能特征，并找到可能的解释。方法我们使用CARMENES，HARPS-N，和HPF仪器，提取活动指数，从这些光谱，以减轻影响的恒星磁活动的数据，并进行了详细的分析ofGaiaastrometry和所有可用的光度时间序列来自MEarth和ASAS-SN surveys.ResultsWe发现一个M>10.6M的伴星GJ 1151在390 d的轨道上，在0.57 Au的分离。第二次调制的证据也存在;这可能是由于长期的磁变或第二个（亚恒星）伴星。这颗星星显示出磁活动增强的片段，其中一个可能与观测到的LOFAR无线电发射有关。我们表明，这是极不可能的，检测到的GJ 1151 c，或任何额外的外部同伴是检测到的信号的来源。我们不能完全排除一个未被发现的短周期行星的解释，这可能与无线电发射有关，因为我们确定了最小质量的上限为1.2M。
ContextDetecting a planetary companion in a short-period orbit through radio emission from the interaction with its host star is a new prospect in exoplanet science. Recently, a tantalising signal was found close to the low-mass stellar system GJ 1151 using LOFAR observations.AimsWe studied spectroscopic time-series data of GJ 1151 in order to search for planetary companions, investigate possible signatures of stellar magnetic activity, and to find possible explanations for the radio signal.MethodsWe used the combined radial velocities measured from spectra acquired with the CARMENES, HARPS-N, and HPF instruments, extracted activity indices from those spectra in order to mitigate the impact of stellar magnetic activity on the data, and performed a detailed analysis ofGaiaastrometry and all available photometric time series coming from the MEarth and ASAS-SN surveys.ResultsWe found a M>10.6M⊕companion to GJ 1151 in a 390d orbit at a separation of 0.57 au. Evidence for a second modulation is also present; this could be due to long-term magnetic variability or a second (substellar) companion. The star shows episodes of elevated magnetic activity, one of which could be linked to the observed LOFAR radio emission. We show that it is highly unlikely that the detected GJ 1151 c, or any additional outer companion is the source of the detected signal. We cannot firmly rule out the suggested explanation of an undetected short-period planet that could be related to the radio emission, as we establish an upper limit of 1.2M⊕for the minimum mass.