Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Field of the Active Planet-hosting M Dwarf AU Mic   AU Mic is a young, very active M dwarf star with a debris disk and at least
one transiting Neptune-size planet. Here we present detailed analysis of the
magnetic field of AU Mic based on previously unpublished high-resolution
optical and near-infrared spectropolarimetric observations. We report a
systematic detection of circular and linear polarization signatures in the
stellar photospheric lines. Tentative Zeeman Doppler imaging modeling of the
former data suggests a non-axisymmetric global field with a surface-averaged
strength of about 90 G. At the same time, linear polarization observations
indicate the presence of a much stronger $\approx$2 kG axisymmetric dipolar
field, which contributes no circular polarization signal due to the equator-on
orientation of AU Mic. A separate Zeeman broadening and intensification
analysis allowed us to determine a mean field modulus of 2.3 and 2.1 kG from
the Y- and K-band atomic lines respectively. These magnetic field measurements
are essential for understanding environmental conditions within the AU Mic
planetary system.

17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org