Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21114505g&link_type=abstract
American Astronomical Society, AAS Meeting #211, #145.05; Bulletin of the American Astronomical Society, Vol. 39, p.998
Astronomy and Astrophysics
Astronomy
Scientific paper
Young solar analogs, called T Tauri stars, are actively accreting material from large dusty proto-planetary disks. Gas is channeled along the field lines of the stellar magnetosphere and rains down onto the surface of the star producing detectable hotspots. Polarization measurements made using photospheric absorption and accretion related emission lines, have provided indirect clues about the complex nature of T Tauri magnetic fields. Until very recently, however, little was known about their true magnetic field topology, with the majority of accretion models assuming simple dipolar fields. Using a technique called Zeeman-Doppler imaging we have, for the first time, mapped the distribution of magnetic polarities across the surface of forming solar-like stars. By extrapolating from such surface magnetograms we have reconstructed the 3D magnetic field geometry. We have modeled how the process of accretion distorts the immediate circumstellar environment, and how large columns of accreting material can influence the stellar coronal X-ray emission. Ultimately this work will shed new light on the history of our own Sun and Solar System at a time when the planets were just beginning to form.
Donati JF
Gregory Scott G.
Jardine Moira M.
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