arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2301.04442astro-ph.EP
收藏

CARMENES搜寻M矮星周围的系外行星。用CARMENES和HARPS-N数据测量的GJ 1151周围的长周期行星

The CARMENES search for exoplanets around M dwarfs. A long-period planet around GJ 1151 measured with CARMENES and HARPS-N data

J. Blanco-Pozo, M. Perger, M. Damasso, G. Anglada Escudé, I. Ribas, D. Baroch, J. A. Caballero, C. Cifuentes, S. V. Jeffers, M. Lafarga, A. Kaminski, S. Kaur, E… 展开作者

J. Blanco-Pozo, M. Perger, M. Damasso, G. Anglada Escudé, I. Ribas, D. Baroch, J. A. Caballero, C. Cifuentes, S. V. Jeffers, M. Lafarga, A. Kaminski, S. Kaur, E. Nagel, V. Perdelwitz, M. Pérez-Torres, A. Sozzetti, D. Viganò, P. J. Amado, G. Andreuzzi, E. L. Brown, F. Del Sordo, S. Dreizler, D. Galadí-Enríquez, A. P. Hatzes, M. Kürster, A. F. Lanza, A. Melis, E. Molinari, D. Montes, M. Murgia, E. Pallé, L. Peña-Moñino, D. Perrodin, M. Pilia, E. Poretti, A. Quirrenbach, A. Reiners, A. Schweitzer, M. R. Zapatero Osorio, M. Zechmeister

摘要:

通过与主星相互作用产生的无线电辐射探测短周期轨道上的行星伴星是系外行星科学的一个新前景。最近,使用LOFAR观测在低质量恒星系统GJ 1151附近发现了诱人的信号。我们研究了GJ 1151的光谱时间序列数据,以寻找行星同伴,调查恒星磁活动的可能特征,并找到无线电信号的可能解释。我们使用了从CARMENES,HARPS-N和HPF仪器获得的光谱中测量的组合径向速度,从这些光谱中提取活动指数,以减轻恒星磁活动对数据的影响,并对盖亚天体测量和来自MEarth和ASAS-SN调查的所有可用光度时间序列进行了详细分析。我们发现了一个M $>$ 10.6 M $_{\oplus}$伴星,它与GJ 1151的轨道距离为0.57 au,轨道周期为390 d。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。这颗恒星显示出磁活动的增强,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 b,或任何额外的外部同伴是检测到的信号的来源。我们不能完全排除可能与射电辐射有关的未被发现的短周期行星的解释,因为我们确定了最小质量的上限为1.2 M $_{\oplus}$。

英文摘要:

Detecting 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. We 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. We 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 of Gaia astrometry and all available photometric time series coming from the MEarth and ASAS-SN surveys. We found a M$>$10.6 M$_{\oplus}$ 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 b, 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 1.2 M$_{\oplus}$ for the minimum mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑