The Outer Disk of the Young Solar Analog: LkCa 15

Details The Outer Disk of the Young Solar Analog: LkCa 15 The Outer Disk of the Young Solar Analog: LkCa 15

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lyot.confe..37g&link_type=abstract

Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 -

Computer Science

Scientific paper

We present a reanalysis of archival HST coronagraphic imagery of the young Solar analog LkCa 15's outer disk. The disk is robustly detected to 200 AU, before deprojection by HST/NICMOS at 1.1 microns, and less robustly by HST/STIS to 140 AU, well beyond the recently reported cavity. For protoplanetary disks at these distances from the star, mild surface brightness asymmetries (typically 3:1) are seen along the system semi-major axis, with the bright side of the disk the near side of the disk. LkCa 15's outer disk is brightest along the side identified as the near side from millimeter interferometry. However, we find an unusually large range in surface brightness from the near to far side of the disk, and along the system major axis which is inconsistent with viewing geometry and with grain scattering effects. We discuss modeling of the outer disk in the context of zonal shadowing or developing structure which may be a precursor to the more complete clearing of the disk seen interior to 50 AU.

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