Abstract
Polstar is a proposed NASA MIDEX mission that carries a high resolution UV spectropolarimeter capable of measure all four Stokes parameters onboard a 60 cm telescope. The mission has been designed to pioneer the field of time-domain UV spectropolarimetry. Time domain UV spectropolarimetry offers the best resource to determine the geometry and physical conditions of protoplanetary disks from the stellar surface to <5 AU. We detail two key objectives that a dedicated time domain UV spectropolarimetry survey, such as that enabled by Polstar or a similar mission concept, could achieve: 1) Test the hypothesis that magneto-accretion operating in young planet-forming disks around lower-mass stars transitions to boundary layer accretion in planet-forming disks around higher mass stars; and 2) Discriminate whether transient events in the innermost regions of planet-forming disks of intermediate mass stars are caused by inner disk mis-alignments or from stellar or disk emissions.
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Acknowledgements
JW acknowledges support from HST-GO 15437 to develop portions of the models presented in this work. PS acknowledges his financial support by the NASA Goddard Space Flight Center to formulate the mission proposal for Polstar. RI acknowledges funding support from a grant by the National Science Foundation (NSF), AST-2009412. SB acknowledges support from the ERC Advanced Grant HotMol, ERC-2011-AdG-291659.
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Wisniewski, J.P., Berdyugin, A.V., Berdyugina, S.V. et al. UV spectropolarimetry with Polstar: protoplanetary disks. Astrophys Space Sci 367, 122 (2022). https://doi.org/10.1007/s10509-022-04125-7
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DOI: https://doi.org/10.1007/s10509-022-04125-7