A Closer Look at the LkCa 15 Protoplanetary Disk
Abstract
We present 870 μm observations of dust continuum emission from the LkCa 15 protoplanetary disk at high angular resolution (with a characteristic scale of 0farcs25 = 35 AU), obtained with the IRAM Plateau de Bure interferometer and supplemented by slightly lower resolution observations from the Submillimeter Array. We fit these data with simple morphological models to characterize the spectacular ring-like emission structure of this disk. Our analysis indicates that a small amount of 870 μm dust emission (~5 mJy) originates inside a large (40-50 AU radius) low optical depth cavity. This result can be interpreted either in the context of an abrupt decrease by a factor of ~5 in the radial distribution of millimeter-sized dust grains or as indirect evidence for a gap in the disk, in agreement with previous inferences from the unresolved infrared spectrum and scattered light images. A preliminary model focused on the latter possibility suggests the presence of a low-mass (planetary) companion, having properties commensurate with those inferred from the recent discovery of LkCa 15b.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2011
- DOI:
- 10.1088/2041-8205/742/1/L5
- arXiv:
- arXiv:1110.3865
- Bibcode:
- 2011ApJ...742L...5A
- Keywords:
-
- circumstellar matter;
- planet-disk interactions;
- protoplanetary disks;
- stars: individual: LkCa 15;
- submillimeter: planetary systems;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- in press at ApJ Letters