Is GM Aur a Young Planetary System?

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Scientific paper

By combining archival HST data of the star GM Aurigae (GM Aur) with Goddard Fabry-Perot narrow-band imagery and long-slit spectroscopy from the Apache Point Observatory 3.5m telescope, we test previous claims that the central region surrounding GM Aur has been cleared of gas and dust, and that mass accretion is no longer occurring. There have been other prior claims that GM Aur has associated Herbig-Haro knots, which are not compatible with a centrally cleared region surrounding the star. We find that the nebulosity extending E-W and located slightly to the north of GM Aur is reflection nebulosity. Along the disk minor axis, where a previous study had suggested there were Herbig-Haro knots, any jet must be a factor of 2 less luminous than AA Tau's outflow, and at most 5% of RY Tau's jet. If we assume the mass loss to mass accretion ratio common for T Tauri stars, our data indicate that the accretion rate onto GM Aur is below 2.5x10-9 solar masses per year, similar to other T Tauri stars with transitional disks.

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