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Orbital Motion and Multi-Wavelength Monitoring of LkCa15 b

Published online by Cambridge University Press:  06 January 2014

Michael J. Ireland  and
Adam L. Kraus
Michael J. Ireland
Affiliation:
Australian Astronomical Observatory, PO Box 296, Epping NSW 1710, Australia email: mireland@aao.gov.au Department of Physics & Astronomy, Macquarie University, NSW 2109Australia
Adam L. Kraus
Affiliation:
Department of Astronomy, University of Texas at Austin, 2515 Speedway, Stop C1400 Austin, Texas 78712-1205, USA email: alk@astro.as.utexas.edu Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USA
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Abstract

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As part of a deep multi-year non-redundant aperture mask infrared imaging campaign observing transition disks, we present multi-epoch monitoring of the resolved emission seen within the disk gap of LkCa 15. Orbital motion of both the central source and extended lobes as presented in Kraus and Ireland (2012) is clearly detected at the level of ~4 degrees/year (deprojected), in both K and L'-bands. Based on these data as well as single-epoch H and M bands epochs, we present two models for the central source - thermal emission as a planetary accretion signature and scattering. The thermal emission model is preferred.

Keywords

planets and satellites: formationstars: individual: LkCa 15instrumentation: high angular resolutiontechniques: image processing

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