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EP: Fachverband Extraterrestrische Physik
EP 14: Astrophysics: Stellar Astrophysics
EP 14.5: Vortrag
Freitag, 24. März 2023, 12:15–12:30, HSZ/0004
Weak Field Approximation of HAT-P-11s Magnetic Field via Stokes Polarimetry — •Andrew Rosenswie1,2, Klaus Strassmeier1,2, Silva Jaervinen2, Thorsten Carroll2, Martina Baratella2, and Ilya Ilyin2 — 1Institut fuer Physik und Astronomie, Universitaet Potsdam, D-14476 Potsdam, Germany — 2Leibniz-Institut fuer Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
Presented in this work is the discovery of the magnetic field strength of the K dwarf star, HAT-P-11, which we measured in polarized light of the Stokes parameter V. The magnetic field was discovered to be 2.73 G. Our methodology can be applied to future polarimetric analyses of magnetically active stars via Stokes V polarimetry. Usage of echelle spectrographs with high spectral resolution allows for the determination of magnetic fields of stars and other celestial objects. We utilize the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI), with spectral resolution R = 130 000. Due to the effects of orbital parameters of HAT-P-11 b, we predicted the detectability of a change of magnetic field strength of HAT-P-11 during the primary transiting eclipse of HAT-P-11 b, detected with PEPSI, consigned in the Large Binocular Telescope (LBT). By our discovery, it provides conclusive evidence via SVD profiles for deducing the magnetic field of a star known to be magnetically active for the past decade.