Investigating the young AU Mic system with SPIRou: large-scale stellar magnetic field and close-in planet mass

Earth and Planetary Astrophysics (astro-ph.EP) polarimetric -techniques [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] imaging -stars FOS: Physical sciences magnetic fields 530 01 natural sciences 520 [SDU] Sciences of the Universe [physics] formation -stars Astrophysics - Solar and Stellar Astrophysics [SDU]Sciences of the Universe [physics] 13. Climate action radial velocities -planets and satellites 0103 physical sciences individual techniques Solar and Stellar Astrophysics (astro-ph.SR) AU Microscopii -stars Astrophysics - Earth and Planetary Astrophysics
DOI: 10.1093/mnras/staa3702 Publication Date: 2020-12-01T21:28:22Z
ABSTRACT
ABSTRACT We present a velocimetric and spectropolarimetric analysis of 27 observations of the 22-Myr M1 star AU Microscopii (AU Mic) collected with the high-resolution YJHK (0.98–2.35 μm) spectropolarimeter SPIRou from 2019 September 18 to November 14. Our radial velocity (RV) time-series exhibits activity-induced fluctuations of 45 m s−1 rms, ∼3 times smaller than those measured in the optical domain, that we filter using Gaussian Process Regression. We report a 3.9σ detection of the recently discovered 8.46 -d transiting planet AU Mic b, with an estimated mass of 17.1$^{+4.7}_{-4.5}$ M⊕ and a bulk density of 1.3 ± 0.4 g cm−3, inducing an RV signature of semi-amplitude K = 8.5$^{+2.3}_{-2.2}$ m s−1 in the spectrum of its host star. A consistent detection is independently obtained when we simultaneously image stellar surface inhomogeneities and estimate the planet parameters with Zeeman–Doppler imaging (ZDI). Using ZDI, we invert the time-series of unpolarized and circularly polarized spectra into surface brightness and large-scale magnetic maps. We find a mainly poloidal and axisymmetric field of 475 G, featuring, in particular, a dipole of 450 G tilted at 19° to the rotation axis. Moreover, we detect a strong differential rotation of dΩ = 0.167 ± 0.009 rad d−1 shearing the large-scale field, about twice stronger than that shearing the brightness distribution, suggesting that both observables probe different layers of the convective zone. Even though we caution that more RV measurements are needed to accurately pin down the planet mass, AU Mic b already appears as a prime target for constraining planet formation models, studying the interactions with the surrounding debris disc, and characterizing its atmosphere with upcoming space- and ground-based missions.
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