Magnetic fields in M dwarfs from the CARMENES survey

被引：77

作者：

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

Reiners, A. ^{[1
]}

Nagel, E. ^{[3
]}

Tal-Or, L. ^{[1
,4
]}

Caballero, J. A. ^{[9
]}

Zechmeister, M. ^{[2
]}

Bejar, V. J. S. ^{[11
,15
]}

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

Martin, E. L. ^{[9
]}

Kaminski, A. ^{[7
]}

Ribas, I. ^{[5
,6
]}

Quirrenbach, A. ^{[7
]}

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

Anglada-Escude, G. ^{[8
,10
]}

Bauer, F. F. ^{[8
]}

Dreizler, S. ^{[2
]}

Guenther, E. W. ^{[12
]}

Henning, T. ^{[13
]}

Jeffers, S. V. ^{[2
]}

Kuerster, M. ^{[13
]}

Lafarga, M. ^{[5
,6
]}

Montes, D. ^{[16
,17
]}

Morales, J. C. ^{[5
,6
]}

Pedraz, S. ^{[14
]}

机构：

[1] Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37075 Gottingen, Germany

[2] Gottingen Univ, Inst Astrophys, Friedrich Hund Pl 1, D-37075 Gottingen, Germany

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

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

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

[6] IEEC, Barcelona 08034, Spain

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

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

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

[10] Queen Mary Univ London, Mile End Rd, London E1 4NS, England

[11] Univ La Laguna, Dept Astrofis, C Via Lactea S-N, E-38206 Tenerife, Spain

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

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

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

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

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

[17] Univ Complutense Madrid, Fac Ciencias Fis, IPARCOS, Inst Fis Particulas & Cosmos, E-28040 Madrid, Spain

来源：

ASTRONOMY & ASTROPHYSICS | 2019年 / 626卷

基金：

以色列科学基金会;

关键词：

stars: low-mass; stars: magnetic field; stars: rotation; stars: atmospheres; ROTATION; EVOLUTION; ZEEMAN; MASS; SATURATION; TOPOLOGIES; STARS; LINES; SOLAR;

D O I：

10.1051/0004-6361/201935315

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. M dwarfs are known to generate the strongest magnetic fields among main-sequence stars with convective envelopes, but we are still lacking a consistent picture of the link between the magnetic fields and underlying dynamo mechanisms, rotation, and activity. Aims. In this work we aim to measure magnetic fields from the high-resolution near-infrared spectra taken with the CARMENES radial-velocity planet survey in a sample of 29 active M dwarfs and compare our results against stellar parameters. Methods. We used the state-of-the-art radiative transfer code to measure total magnetic flux densities from the Zeeman broadening of spectral lines and filling factors. Results. We detect strong kG magnetic fields in all our targets. In 16 stars the magnetic fields were measured for the first time. Our measurements are consistent with the magnetic field saturation in stars with rotation periods P < 4 d. The analysis of the magnetic filling factors reveal two different patterns of either very smooth distribution or a more patchy one, which can be connected to the dynamo state of the stars and/or stellar mass. Conclusions. Our measurements extend the list of M dwarfs with strong surface magnetic fields. They also allow us to better constrain the interplay between the magnetic energy, stellar rotation, and underlying dynamo action. The high spectral resolution and observations at near-infrared wavelengths are the beneficial capabilities of the CARMENES instrument that allow us to address important questions about the stellar magnetism.

引用

页数：24