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arXiv 2103.10216astro-ph.EPastro-ph.SR
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CARMENES搜寻M矮星周围的系外行星,没有证据表明在GJ 1151周围的2天轨道上有超级地球

The CARMENES search for exoplanets around M dwarfs, No evidence for a super-Earth in a 2-day orbit around GJ 1151

M. Perger, I. Ribas, G. Anglada-Escudé, J. C. Morales, P. J. Amado, J. A. Caballero, A. Quirrenbach, A. Reiners, V. J. S. Béjar, S. Dreizler, D. Galadí-Enríquez… 展开作者

M. Perger, I. Ribas, G. Anglada-Escudé, J. C. Morales, P. J. Amado, J. A. Caballero, A. Quirrenbach, A. Reiners, V. J. S. Béjar, S. Dreizler, D. Galadí-Enríquez, A. P. Hatzes, Th. Henning, S. V. Jeffers, A. Kaminski, M. Kürster, M. Lafarga, D. Montes, E. Palé, C. Rodríguez-López, A. Schweitzer, M. R. Zapatero Osorio, M. Zechmeister

摘要:

类地系外行星与低质量宿主恒星的磁场之间的相互作用被认为会产生射频的微弱发射信号。一项使用LOFAR数据的研究宣布,探测到来自中M型矮星GJ 1151的无线电发射,这可能来自一颗近距离的类地行星。最近,使用HARPS-N和HPF仪器的69个径向速度(RV),声称存在一颗周期为2天的2.5-Me行星绕GJ 1151运行。我们在CARMENES M-矮星巡天的框架内获得了70个新的高精度RV测量结果,并使用这些数据来确认所声称的行星的存在,并对GJ 1151系统中可能的行星伴侣进行限制。我们分析了所有三种仪器的组合RV数据集中存在的周期性,并计算了短周期轨道中潜在行星的检测极限。我们无法确认最近宣布的候选行星,并得出结论,HARPS-N和HPF数据集中的2天信号很可能是由长期RV变化产生的,可能是由外行星伴星引起的,但不受约束。我们计算出RV半振幅的99.9%显著性检测限为1.50 ms-1,这使得轨道周期分别为1天和5天的任何潜在系外行星的最小质量的上限为0.7 Me和1.2 Me。

英文摘要:

The interaction between Earth-like exoplanets and the magnetic field of low-mass host stars are considered to produce weak emission signals at radio frequencies. A study using LOFAR data announced the detection of radio emission from the mid M-type dwarf GJ 1151 that could potentially arise from a close-in terrestrial planet. Recently, the presence of a 2.5-Me planet orbiting GJ 1151 with a 2-day period has been claimed using 69 radial velocities (RVs) from the HARPS-N and HPF instruments. We have obtained 70 new high-precision RV measurements in the framework of the CARMENES M-dwarf survey and use these data to confirm the presence of the claimed planet and to place limits on possible planetary companions in the GJ 1151 system. We analyse the periodicities present in the combined RV data sets from all three instruments and calculate the detection limits for potential planets in short-period orbits. We cannot confirm the recently-announced candidate planet and conclude that the 2-day signal in the HARPS-N and HPF data sets is most probably produced by a long-term RV variability possibly arising from an outer planetary companion yet unconstrained. We calculate a 99.9% significance detection limit of 1.50 ms-1 in the RV semi-amplitude, which places upper limits of 0.7 Me and 1.2 Me to the minimum masses of any potential exoplanets with orbital periods of 1 and 5 days, respectively.

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