作者
Ignasi Ribas, M Tuomi, A Reiners, RP Butler, JC Morales, M Perger, S Dreizler, Cristina Rodríguez-López, JI González Hernández, A Rosich, F Feng, T Trifonov, SS Vogt, JA Caballero, A Hatzes, E Herrero, SV Jeffers, M Lafarga, F Murgas, RP Nelson, E Rodríguez, JBP Strachan, L Tal-Or, J Teske, B Toledo-Padrón, M Zechmeister, A Quirrenbach, Pedro J Amado, M Azzaro, VJS Béjar, JR Barnes, ZM Berdiñas, J Burt, G Coleman, M Cortés-Contreras, J Crane, SG Engle, EF Guinan, CA Haswell, Th Henning, B Holden, J Jenkins, HRA Jones, Adrian Kaminski, M Kiraga, M Kürster, MH Lee, MJ López-González, D Montes, J Morin, A Ofir, E Pallé, R Rebolo, S Reffert, A Schweitzer, W Seifert, SA Shectman, D Staab, RA Street, A Suárez Mascareño, Y Tsapras, SX Wang, G Anglada-Escudé
发表日期
2018/11
期刊
Nature
卷号
563
期号
7731
页码范围
365-368
出版商
Nature Publishing Group
简介
Barnard’s star is a red dwarf, and has the largest proper motion (apparent motion across the sky) of all known stars. At a distance of 1.8 parsecs, it is the closest single star to the Sun; only the three stars in the α Centauri system are closer. Barnard’s star is also among the least magnetically active red dwarfs known, and has an estimated age older than the Solar System. Its properties make it a prime target for planetary searches; various techniques with different sensitivity limits have been used previously, including radial-velocity imaging, –, astrometry, and direct imaging, but all ultimately led to negative or null results. Here we combine numerous measurements from high-precision radial-velocity instruments, revealing the presence of a low-amplitude periodic signal with a period of 233 days. Independent photometric and spectroscopic monitoring, as well as an analysis of instrumental systematic effects, suggest that …
学术搜索中的文章
I Ribas, M Tuomi, A Reiners, RP Butler, JC Morales… - Nature, 2018