The CARMENES search for exoplanets around M dwarfs Spectroscopic orbits of nine M-dwarf multiple systems, including two triples, two brown dwarf candidates, and one close M-dwarf-white dwarf binary

被引：14

作者：

Baroch, D. ^{[1
,2
]}

Morales, J. C. ^{[1
,2
]}

Ribas, I ^{[1
,2
]}

Bejar, V. J. S. ^{[3
,4
]}

Reffert, S. ^{[5
]}

Guillen, C. Cardona ^{[3
,4
]}

Reiners, A. ^{[6
]}

Caballero, J. A. ^{[7
]}

Quirrenbach, A. ^{[5
]}

Amado, P. J. ^{[8
]}

Anglada-Escude, G. ^{[1
,2
]}

Colome, J. ^{[1
,2
]}

Cortes-Contreras, M. ^{[7
,9
]}

Dreizler, S. ^{[6
]}

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

Hatzes, A. P. ^{[11
]}

Jeffers, S., V ^{[12
]}

Henning, Th ^{[13
]}

Herrero, E. ^{[1
,2
]}

Kaminski, A. ^{[5
]}

Kuerster, M. ^{[13
]}

Lafarga, M. ^{[1
,2
]}

Lodieu, N. ^{[3
,4
]}

Lopez-Gonzalez, M. J. ^{[8
]}

Montes, D. ^{[14
,15
]}

Palle, E. ^{[3
,4
]}

Perger, M. ^{[1
,2
]}

Pollacco, D. ^{[16
]}

Rodriguez-Lopez, C. ^{[8
]}

Rodriguez, E. ^{[8
]}

Rosich, A. ^{[1
,2
]}

Schoefer, P. ^{[6
]}

Schweitzer, A. ^{[17
]}

Shan, Y. ^{[6
]}

Tal-Or, L. ^{[6
,18
]}

Zechmeister, M. ^{[6
]}

机构：

[1] CSIC, Inst Ciencies Espai ICE, Campus UAB,C Can Magrans S-N, Barcelona 08193, Spain

[2] Inst Estudis Espacials Catalunya IEEC, C Gran Capita 2-4, Barcelona 08034, Spain

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

[4] Univ La Laguna, Dept Astrofis, Tenerife 38026, Spain

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

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

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

[8] CSIC, Inst Astrofis Andalucia IAA, Glorieta Astron S-N, Granada 18008, Spain

[9] Spanish Virtual Observ, Granada, Spain

[10] Observ Calar Alto, Ctr Astron Hispano Aleman, Gergal 04550, Spain

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

[12] Max Planck Inst Solar Syst Res, Justus von Liebig Weg 3, D-37077 Gottingen, Germany

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

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

[15] Univ Complutense Madrid, Fac Ciencias Fis, UCM Inst Fis Particulas & Cosmos UCM, Madrid 28040, Spain

[16] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

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

[18] Ariel Univ, Dept Phys, IL-40700 Ariel, Israel

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 653卷

基金：

美国国家科学基金会;

关键词：

stars: low-mass; brown dwarfs; white dwarfs; binaries: spectroscopic; astrometry; LOW-MASS STARS; ALL-SKY SURVEY; STELLAR KINEMATIC GROUPS; ADAPTIVE OPTICS SYSTEM; K2 ROTATION PERIODS; YOUNG MOVING GROUPS; PROPER-MOTION; CHROMOSPHERIC ACTIVITY; ECHELLE SPECTROGRAPH; LUMINOSITY FUNCTION;

D O I：

10.1051/0004-6361/202141031

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. M dwarfs are ideal targets for the search of Earth-size planets in the habitable zone using the radial velocity method, and are attracting the attention of many ongoing surveys. One of the expected results of these surveys is that new multiple-star systems have also been found. This is the case also for the CARMENES survey, thanks to which nine new double-line spectroscopic binary systems have already been announced. Aims. Throughout the five years of the survey the accumulation of new observations has resulted in the detection of several new multiple-stellar systems with long periods and low radial-velocity amplitudes. Here we newly characterise the spectroscopic orbits and constrain the masses of eight systems and update the properties of a system that we had reported earlier. Methods. We derived the radial velocities of the stars using two-dimensional cross-correlation techniques and template matching. The measurements were modelled to determine the orbital parameters of the systems. We combined CARMENES spectroscopic observations with archival high-resolution spectra from other instruments to increase the time span of the observations and improve our analysis. When available, we also added archival photometric, astrometric, and adaptive optics imaging data to constrain the rotation periods and absolute masses of the components. Results. We determined the spectroscopic orbits of nine multiple systems, eight of which are presented for the first time. The sample is composed of five single-line binaries, two double-line binaries, and two triple-line spectroscopic triple systems. The companions of two of the single-line binaries, GJ 3626 and GJ 912, have minimum masses below the stellar boundary, and thus could be brown dwarfs. We found a new white dwarf in a close binary orbit around the Mstar GJ 207.1, located at a distance of 15.79 pc. From a global fit to radial velocities and astrometric measurements, we were able to determine the absolute masses of the components of GJ 282 C, which is one of the youngest systems with measured dynamical masses.

引用

页数：27

共 21 条

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