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  The CARMENES search for exoplanets around M dwarfs. A Neptune-mass planet traversing the habitable zone around HD 180617

Kaminski, A., Trifonov, T., Caballero, J. A., Quirrenbach, A., Ribas, I., Reiners, A., et al. (2018). The CARMENES search for exoplanets around M dwarfs. A Neptune-mass planet traversing the habitable zone around HD 180617. Astronomy and Astrophysics, 618.

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Kaminski, A.1, Author
Trifonov, T.1, Author
Caballero, J. A.1, Author
Quirrenbach, A.1, Author
Ribas, I.1, Author
Reiners, A.1, Author
Amado, P. J.1, Author
Zechmeister, M.1, Author
Dreizler, S.1, Author
Perger, M.1, Author
Tal-Or, L.1, Author
Bonfils, X.1, Author
Mayor, M.1, Author
Astudillo-Defru, N.1, Author
Bauer, F. F.1, Author
Béjar, V. J. S.1, Author
Cifuentes, C.1, Author
Colomé, J.1, Author
Cortés-Contreras, M.1, Author
Delfosse, X.1, Author
Díez-Alonso, E.1, AuthorForveille, T.1, AuthorGuenther, E. W.1, AuthorHatzes, A. P.1, AuthorHenning, Th.1, AuthorJeffers, S. V.1, AuthorKürster, M.1, AuthorLafarga, M.1, AuthorLuque, R.1, AuthorMandel, H.1, AuthorMontes, D.1, AuthorMorales, J. C.1, AuthorPassegger, V. M.1, AuthorPedraz, S.1, AuthorReffert, S.1, AuthorSadegi, S.1, AuthorSchweitzer, A.1, AuthorSeifert, W.1, AuthorStahl, O.1, AuthorUdry, S.1, Author more..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: planetary systems stars: late-type stars: low-mass stars: individual: HD 180617 Astrophysics - Earth and Planetary Astrophysics
 Abstract: Despite their activity, low-mass stars are of particular importance for the search of exoplanets by the means of Doppler spectroscopy, as planets with lower masses become detectable. We report on the discovery of a planetary companion around HD 180617, a bright (J = 5.58 mag), low- mass (M = 0.45M) star of spectral type M2.5 V. The star, located at a distance of 5.9 pc, is the primary of the high proper motion binary system containing vB 10, a star with one of the lowest masses known in most of the twentieth century. Our analysis is based on new radial velocity (RV) measurements made at red-optical wavelengths provided by the high-precision spectrograph CARMENES, which was designed to carry out a survey for Earth-like planets around M dwarfs. The available CARMENES data are augmented by archival Doppler measurements from HIRES and HARPS. Altogether, the RVs span more than 16 yr. The modeling of the RV variations, with a semi-amplitude of K = 2.85-0.25+0.16 m s-1, yields a Neptune- like planet with a minimum mass of 12.2-1.4+1.0 M on a 105.90-0.10+0.09 d circumprimary orbit, which is partly located in the host star's habitable zone. The analysis of time series of common activity indicators does not show any dependence on the detected RV signal. The discovery of HD 180617 b not only adds information to a currently hardly filled region of the mass-period diagram of exoplanets around M dwarfs, but the investigated system becomes the third known binary consisting of M dwarfs and hosting an exoplanet in an S-type configuration. Its proximity makes it an attractive candidate for future studies. The RV data (Table C.1) are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://cdsarc.u-strasbg.fr">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/618/A115">http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/618/A115</A>

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 Dates: 2018
 Publication Status: Issued
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 618 Sequence Number: - Start / End Page: - Identifier: -