The CARMENES search for exoplanets around M dwarfs Detection of a mini-Neptune around LSPM J2116+0234 and refinement of orbital parameters of a super-Earth around GJ 686 (BD+18 3421)

被引：14

作者：

Lalitha, S. ^{[1
]}

Baroch, D. ^{[2
,3
]}

Morales, J. C. ^{[2
,3
]}

Passegger, V. M. ^{[4
]}

Bauer, F. F. ^{[5
]}

Cardona Guillen, C. ^{[6
,7
]}

Dreizler, S. ^{[1
]}

Oshagh, M. ^{[1
]}

Reiners, A. ^{[1
]}

Ribas, I ^{[2
,3
]}

Caballero, J. A. ^{[8
]}

Quirrenbach, A. ^{[9
]}

Amado, P. J. ^{[5
]}

Bejar, V. J. S. ^{[6
,7
]}

Colome, J. ^{[2
,3
]}

Cortes-Contreras, M. ^{[8
]}

Galadi-Enriquez, D. ^{[10
]}

Gonzalez-Cuesta, L. ^{[6
,7
]}

Guenther, E. W. ^{[11
]}

Hagen, H-J ^{[4
]}

Henning, T. ^{[12
]}

Herrero, E. ^{[2
,3
]}

Husser, T-O ^{[1
]}

Jeffers, S., V ^{[1
]}

Kaminski, A. ^{[9
]}

Kuerster, M. ^{[12
]}

Lafarga, M. ^{[2
,3
]}

Lodieu, N. ^{[6
,7
]}

Lopez-Gonzalez, M. J. ^{[5
]}

Montes, D. ^{[13
,14
]}

Perger, M. ^{[2
,3
]}

Rosich, A. ^{[2
,3
]}

Rodriguez, E. ^{[5
]}

Rodriguez-Lopez, C. ^{[5
]}

Schmitt, J. H. M. M. ^{[4
]}

Tal-Or, L. ^{[1
,15
]}

Zechmeister, M. ^{[1
]}

机构：

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

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

[3] IEEC, C Gran Capita 2-4, Barcelona 08034, Spain

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

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

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

[7] Univ La Laguna, Dept Astrofis, San Cristobal la Laguna, Tenerife, Spain

[8] CSIC, ESAC, Ctr Astrobiol, INTA, Madrid, Spain

[9] Heidelberg Univ, Landessternwarte, Zentrum Astron, D-69117 Heidelberg, Germany

[10] Observ Calar Alto, Ctr Astronom Hispano Aleman, Sierra De Los Filabres 04550, Gergal, Spain

[11] Thuringer Landesstenwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

[12] Max Planck Inst Astron, Konigstuhl 17, Heidelberg, Germany

[13] Univ Complutense Madrid, Fac Ciencias Fis, Dept Fis Tierra & Astrofis, Madrid 28040, Spain

[14] Univ Complutense Madrid, Fac Ciencias Fis, IPARCOS UCM Intituto Fis Particulas & Cosmos UCM, Madrid 28040, Spain

[15] Tel Aviv Univ, Dept Geophy, Raymond & Beverly Sackler Fac Exact Sci, IL-6997801 Tel Aviv, Israel

来源：

ASTRONOMY & ASTROPHYSICS | 2019年 / 627卷

基金：

美国国家航空航天局; 以色列科学基金会;

关键词：

stars: individual: LSPM J2116+0234; stars: individual: GJ 686; stars: low-mass; techniques: radial velocities; planetary systems; stars: activity; LOW MASS STARS; CHROMOSPHERIC ACTIVITY; SOLAR NEIGHBORHOOD; PLANET; ROTATION; CATALOG; PARALLAXES; MEMBERS; JITTER;

D O I：

10.1051/0004-6361/201935534

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Although M dwarfs are known for high levels of stellar activity, they are ideal targets for the search of low-mass exoplanets with the radial velocity (RV) method. We report the discovery of a planetary-mass companion around LSPM J2116+0234 (M3.0 V) and confirm the existence of a planet orbiting GJ 686 (BD+18 3421; M1.0 V). The discovery of the planet around LSPM J2116+0234 is based on CARMENES RV observations in the visual and near-infrared channels. We confirm the planet orbiting around GJ 686 by analyzing the RV data spanning over two decades of observations from CARMENES VIS, HARPS-N, HARPS, and HIRES. We find planetary signals at 14.44 and 15.53 d in the RV data for LSPM J2116+0234 and GJ 686, respectively. Additionally, the RV, photometric time series, and various spectroscopic indicators show hints of variations of 42 d for LSPM J2116+0234 and 37 d for GJ 686, which we attribute to the stellar rotation periods. The orbital parameters of the planets are modeled with Keplerian fits together with correlated noise from the stellar activity. A mini-Neptune with a minimum mass of 11.8 M-circle plus orbits LSPM J2116+0234 producing a RV semiamplitude of 6.19 m s(-1), while a super-Earth of mass 6.6 M-circle plus orbits GJ 686 and produces a RV semi-amplitude of 3.0 m s(-1). Both LSPM J2116+0234 and GJ 686 have planetary companions populating the regime of exoplanets with masses lower than 15 M-circle plus and orbital periods < 20 d.

引用

页数：21

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