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Title

RedDots: a temperate 1.5 Earth-mass planet candidate in a compact multiterrestrial planet system around GJ 1061

AuthorsDreizler, S.; Jeffers, S. V.; Rodríguez Martínez, Eloy ; Zechmeister, M.; Barnes, J. R.; Haswell, C. A.; Coleman, G. A. L.; Lalitha, S.; Hidalgo Soto, D.; Strachan, J. B. P.; Hambsch, F. -J.; López González, Maria J. ; Morales, Nicolás ; Rodríguez-López, Cristina ; Berdiñas, Z. M.; Ribas, I.; Pallé, E.; Reiners, A.; Anglada-Escudé, G.
Keywordsmethods: data analysis
techniques: radial velocities
stars: individual: GJ 1061
stars: late-type
planetary systems
Issue Date2020
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 493(1): 536-550 (2020)
AbstractSmall low-mass stars are favourable targets for the detection of rocky habitable planets. In particular, planetary systems in the solar neighbourhood are interesting and suitable for precise characterization. The RedDots campaigns seek to discover rocky planets orbiting nearby low-mass stars. The 2018 campaign targeted GJ 1061, which is the 20th nearest star to the Sun. For three consecutive months we obtained nightly, high-precision radial velocity measurements with the HARPS spectrograph. We analysed these data together with archival HARPS data. We report the detection of three planet candidates with periods of 3.204 +/- 0.001, 6.689 +/- 0.005, and 13.03 +/- 0.03 d, which are close to 1:2:4 period commensurability. After several considerations related to the properties of the noise and sampling, we conclude that a fourth signal is most likely explained by stellar rotation, although it may be due to a planet. The proposed three-planet system (and the potential four-planet solution) is long-term dynamically stable. Planet-planet gravitational interactions are below our current detection threshold. The minimum masses of the three planets range from 1.4 +/- 0.2 to 1.8 +/- 0.3 M-circle plus. Planet d, with msin i = 1.64 +/- 0.24 M-circle plus, receives a similar amount of energy as Earth receives from the Sun. Consequently it lies within the liquid-water habitable zone of the star and has a similar equilibrium temperature to Earth. GJ 1061 has very similar properties to Proxima Centauri but activity indices point to lower levels of stellar activity.C 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Publisher version (URL)http://dx.doi.org/10.1093/mnras/staa248
URIhttp://hdl.handle.net/10261/206601
DOI10.1093/mnras/staa248
ISSN0035-8711
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(IAA) Artículos
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