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

<i>Context.<i/> 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 coul...

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Main Authors: Perger, Manuel (Author) , Ribas, I. (Author) , Anglada-Escudé, G. (Author) , Morales, J. C. (Author) , Amado, P. J. (Author) , Caballero, J. A. (Author) , Quirrenbach, Andreas (Author) , Reiners, A. (Author) , Béjar, V. J. S. (Author) , Dreizler, S. (Author) , Galadí-Enríquez, D. (Author) , Hatzes, A. P. (Author) , Henning, Thomas (Author) , Jeffers, S. V. (Author) , Kaminski, Adrian (Author) , Kürster, M. (Author) , Lafarga, M. (Author) , Montes, D. (Author) , Pallé, E. (Author) , Rodríguez-López, C. (Author) , Schweitzer, A. (Author) , Osorio, M. R. Zapatero (Author) , Zechmeister, Mathias (Author)
Format: Article (Journal) Editorial
Language:English
Published: 07 May 2021
In: Astronomy and astrophysics
Year: 2021, Volume: 649, Pages: 1-4
ISSN:1432-0746
DOI:10.1051/0004-6361/202140786
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202140786
Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2021/05/aa40786-21/aa40786-21.html
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Author Notes: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. Pallé, C. Rodríguez-López, A. Schweitzer, M.R. Zapatero Osorio, and M. Zechmeister
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Summary:<i>Context.<i/> 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-<i>M<i/><sub>⊕<sub/> planet orbiting GJ 1151 with a 2-day period has been claimed using 69 radial velocities (RVs) from the HARPS-N and HPF instruments.<i>Aims.<i/> 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.<i>Methods.<i/> We analysed the periodicities present in the combined RV data sets from all three instruments and calculated the detection limits for potential planets in short-period orbits.<i>Results.<i/> 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 that has yet to be constrained. We calculate a 99.9% significance detection limit of 1.50 m s<sup>−1<sup/> in the RV semi-amplitude, which places upper limits of 0.7 <i>M<i/><sub>⊕<sub/> and 1.2 <i>M<i/><sub>⊕<sub/> on the minimum masses of potential exoplanets with orbital periods of 1 and 5 days, respectively.
Item Description:Gesehen am 26.08.2021
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202140786

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