RT Journal Article
T1 The CARMENES search for exoplanets around M dwarfs A Neptune-mass planet traversing the habitable zone around HD 180617
A1 Kaminski, A.
A1 Trifonov, T.
A1 Caballero, J. A.
A1 Quirrenbach, A.
A1 Ribas, I.
A1 Reiners, A.
A1 Amado, P. J.
A1 Zechmeister, M.
A1 Dreizler, S.
A1 Perger, M.
A1 Tal-Or, L.
A1 Bonfils, X.
A1 Mayor, M.
A1 Astudillo Defru, N.
A1 Bauer, F. F.
A1 Béjar, V. J. S.
A1 Cifuentes, C.
A1 Colomé, J.
A1 Cortés Contreras, Miriam
A1 Delfosse, X.
A1 Díez Alonso, E.
A1 Forveille, T.
A1 Guenther, E. W.
A1 Hatzes, A. P.
A1 Henning, Th.
A1 Jeffers, S. V.
A1 Kürster, M.
A1 Lafarga, M.
A1 Luque, R.
A1 Mandel, H.
A1 Montes Gutiérrez, David
A1 Morales, J. C.
A1 Passegger, V. M.
A1 Pedraz, S.
A1 Reffert, S.
A1 Sadegi, S.
A1 Schweitzer, W.
A1 Seifert, W.
A1 Stahl, O.
A1 Udry, S.
AB 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 = 0.45 M-circle dot) 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-circle plus 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.
PB EDP Sciences S A
SN 1432-0746
YR 2018
FD 2018-10-17
LK https://hdl.handle.net/20.500.14352/12944
UL https://hdl.handle.net/20.500.14352/12944
LA eng
NO Kaminski, A., Trifonov, T., Caballero, J. A. et al. «The CARMENES Search for Exoplanets around M Dwarfs - A Neptune-Mass Planet Traversing the Habitable Zone around HD 180617». Astronomy & Astrophysics, vol. 618, octubre de 2018, p. A115. www.aanda.org, https://doi.org/10.1051/0004-6361/201833354.
NO German Max-Planck-Gesellschaft
NO Consejo Superior de Investigaciones Científicas (España)
NO Fondo Europeo de Desarrollo Regional
NO Max-Planck-Institut für Astronomie
NO Instituto de Astrofísica de Andalucía
NO Landessternwarte Königstuhl
NO Institut de Ciències de l’Espai
NO Insitut für Astrophysik Göttingen
NO Universidad Complutense de Madrid
NO Thüringer Landessternwarte Tautenburg
NO Instituto de Astrofísica de Canarias
NO Hamburger Sternwarte
NO Centro de Astrobiología and Centro Astronómico Hispano-Alemán
NO Ministerio de Ciencia, Innovación y Universidades (España)
NO German Science Foundation through the Major Research Instrumentation Programme
NO DFG Research Unit FOR2544 “Blue Planets around Red Stars”
NO Klaus Tschira Stiftung
NO State of Baden-Württemberg
NO State of Niedersachsen
NO Junta de Andalucía
NO Fondo Nacional de Desarrollo Científico y Tecnológico
NO W. M. Keck Foundation
DS Docta Complutense
RD 29 jun 2025