Searching for circumplanetary disks around LkCa 15

Abstract

We present Karl G. Jansky Very Large Array (VLA) observations of the 7 mm continuum emission from the disk surrounding the young star LkCa 15. The observations achieve an angular resolution of 70 mas and spatially resolve the circumstellar emission on a spatial scale of 9 AU. The continuum emission traces a dusty annulus of 45 AU in radius that is consistent with the dust morphology observed at shorter wavelengths. The VLA observations also reveal a compact source at the center of the disk, possibly due to thermal emission from hot dust or ionized gas located within a few AU from the central star. No emission is observed between the star and the dusty ring, and, in particular, at the position of the candidate protoplanet LkCa 15 b. By comparing the observations with theoretical models for circumplanetary disk emission, we find that if LkCa~15~b is a massive planet (>5 M_J) accreting at a rate greater than 1.e-6 M_J yr^{-1}, then its circumplanetary disk is less massive than 0.1 M_J, or smaller than 0.4 Hill radii. Similar constraints are derived for any possible circumplanetary disk orbiting within 45 AU from the central star. The mass estimate are uncertain by at least one order of magnitude due to the uncertainties on the mass opacity. Future ALMA observations of this system might be able to detect circumplanetary disks down to a mass of 5.e-4 M_J and as small as 0.2 AU, providing crucial constraints on the presence of giant planets in the act of forming around this young star.

arXiv commentAccepted for publication on ApJ

References in corpus (44)

• Spectral Energy Distributions of T Tauri Stars With Passive Circumstellar Disks
• Passive irradiated circumstellar disks with an inner hole
• Protoplanetary Disk Structures in Ophiuchus
• Accretion Disks around Young Objects. I. The Detailed Vertical Structure
• A Major Asymmetric Dust Trap in a Transition Disk
• The Expanded Very Large Array -- a New Telescope for New Science
• Dynamical Masses of T Tauri Stars and Calibration of PMS Evolution
• Discovery of Small-Scale Spiral Structures in the Disk of SAO 206462 (HD 135344B): Implications for the Physical State of the Disk from Spiral Density Wave Theory
• Observations of gas flows inside a protoplanetary gap
• Spectral and Photometric Diagnostics of Giant Planet Formation Scenarios
• LkCa 15: A Young Exoplanet Caught at Formation?
• Structure and evolution of pre-main sequence circumstellar disks
• The TW Hya Disk at 870 microns: Comparison of CO and Dust Radial Structures
• Transitional and Pre-Transitional disks: Gap Opening by Multiple Planets?
• Spiral Arms in the Asymmetrically Illuminated Disk of MWC 758 and Constraints on Giant Planets
• Direct Imaging of Fine Structures in Giant Planet Forming Regions of the Protoplanetary Disk around AB Aurigae
• A Spitzer view of protoplanetary disks in the gamma Velorum cluster
• Large-Scale Asymmetries in the Transitional Disks of SAO 206462 and SR 21
• Large dust particles in disks around T Tauri stars
• Accretion of Jupiter-mass Planets in the Limit of Vanishing Viscosity
• Nested-grid calculations of disk-planet interaction
• A Spatially Resolved Inner Hole in the Disk around GM Aurigae
• A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
• VLBA determination of the distance to nearby star-forming regions I. The distance to T Tauri with 0.4% accuracy
• Small vs large dust grains in transitional disks: do different cavity sizes indicate a planet?
• Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths
• Investigating planet formation in circumstellar disks: CARMA observations of RY Tau and DG Tau
• Local Enhancement of Surface Density in the Protoplanetary Ring Surrounding HD 142527
• An azimuthal asymmetry in the LkHa 330 disk
• A companion candidate in the gap of the T Cha transitional disk
• Integrated Polarization Properties of 3C48, 3C138, 3C147, and 3C286
• Discovery of H-alpha Emission from the Close Companion Inside the Gap of Transitional Disk HD142527
• Imaging of a Transitional Disk Gap in Reflected Light: Indications of Planet Formation Around the Young Solar Analog LkCa 15
• Subaru Imaging of Asymmetric Features in a Transitional Disk in Upper Scorpius
• Millimeter imaging of MWC 758: probing the disk structure and kinematics
• A Closer Look at the LkCa 15 Protoplanetary Disk
• Resolving the Circumstellar Disk of HL Tauri at Millimeter Wavelengths
• On the nature of the transition disk around LkCa 15
• The Evolution of Circumplanetary Disks around Planets in Wide Orbits: Implications for Formation Theory, Observations, and Moon Systems
• Enhanced Dust Emission in the HL Tau Disc: A Low-Mass Companion in Formation?
• High Angular Resolution Radio Observations of the HL/XZ Tau Region: Mapping the 50 AU Protoplanetary Disk around HL Tau and Resolving XZ Tau S into a 13 AU Binary
• Submillimeter Array Observations of the RX J1633.9-2442 Transition Disk: Evidence for Multiple Planets in the Making
• Matryoshka Holes: Nested Emission Rings in the Transitional Disk Oph IRS 48
• Origin of Europa and the Galilean Satellites

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