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

被引：36

作者：

Kaminski, A. ^{[1
]}

Trifonov, T. ^{[2
]}

Caballero, J. A. ^{[3
]}

Quirrenbach, A. ^{[1
]}

Ribas, I. ^{[4
,5
]}

Reiners, A. ^{[6
]}

Amado, P. J. ^{[7
]}

Zechmeister, M. ^{[6
]}

Dreizler, S. ^{[6
]}

Perger, M. ^{[4
,5
]}

Tal-Or, L. ^{[6
,8
]}

Bonfils, X. ^{[9
]}

Mayor, M. ^{[10
]}

Astudillo-Defru, N. ^{[11
]}

Bauer, F. F. ^{[6
,7
]}

Bejar, V. J. S. ^{[12
,13
]}

Cifuentes, C. ^{[3
,14
]}

Colome, J. ^{[4
,5
]}

Cortes-Contreras, M. ^{[3
]}

Delfosse, X. ^{[9
]}

Diez-Alonsom, E. ^{[14
]}

Forveille, T. ^{[9
]}

Guenther, E. W. ^{[15
]}

Hatzes, A. P. ^{[15
]}

Henning, Th. ^{[2
]}

Jeffers, S. V. ^{[6
]}

Kuerster, M. ^{[2
]}

Lafarga, M. ^{[4
,5
]}

Luque, R. ^{[1
,12
,13
]}

Mandel, H. ^{[1
]}

Montes, D. ^{[14
]}

Morales, J. C. ^{[4
,5
]}

Passegger, V. M. ^{[16
]}

Pedraz, S. ^{[17
]}

Reffert, S. ^{[1
]}

Sadegi, S. ^{[1
]}

Schweitzer, A. ^{[16
]}

Seifert, W. ^{[1
]}

Stahl, O. ^{[1
]}

Udry, S. ^{[10
]}

机构：

[1] Heidelberg Univ, Landessternwarte, Zentrum Astron, Konigstuhl 12, D-69117 Heidelberg, Germany

[2] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[3] INTA, CSIC, Ctr Astrobiol, ESAC Campus,Camino Bajo del Castillo S-N, Madrid 28692, Spain

[4] CSIC, ICE, Campus UAB,C Can Magrans S-N, Barcelona 08193, Spain

[5] IEEC, Barcelona 08034, Spain

[6] Georg August Univ, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany

[7] CSIC, IAA, Glorieta Astron S-N, E-18008 Granada, Spain

[8] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Geosci, IL-6997801 Tel Aviv, Israel

[9] Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France

[10] Univ Geneva, Observ Geneve, 51 Ch Maillettes, CH-1290 Sauverny, Switzerland

[11] Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile

[12] Inst Astrofis Canarias, Via Lactea S-N, Tenerife 38205, Spain

[13] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[14] Univ Complutense Madrid, Fac Ciencias Fis, Dept Astrofis & Ciencias Atmosfera, E-28040 Madrid, Spain

[15] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

[16] Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany

[17] CSIC, Ctr Astron Hispano Aleman, MPG, Observ Astron Calar Alto, Gergal 04550, Almeria, Spain

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 618卷

基金：

欧盟地平线“2020”;

关键词：

planetary systems; stars: late-type; stars: low-mass; stars: individual: HD 180617; SOLAR NEIGHBORHOOD; VB; 10; STARS; CATALOG; COMPANIONS; CANDIDATE; SEQUENCE; SYSTEMS;

D O I：

10.1051/0004-6361/201833354

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：11

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