Two Rings and a Marginally Resolved, 5 au Disk around LkCa 15 Identified via Near-infrared Sparse Aperture Masking Interferometry - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Year : 2022

Two Rings and a Marginally Resolved, 5 au Disk around LkCa 15 Identified via Near-infrared Sparse Aperture Masking Interferometry

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Dori Blakely
  • Function : Author
Logan Francis
Doug Johnstone
Anthony Soulain
  • Function : Author
Peter Tuthill
  • Function : Author
Anthony Cheetham
  • Function : Author
Joel Sanchez-Bermudez
  • Function : Author
Anand Sivaramakrishnan
  • Function : Author
Ruobing Dong
Nienke van Der Marel
  • Function : Author
Rachel Cooper
  • Function : Author

Abstract

Sparse aperture masking interferometry (SAM) is a high-resolution observing technique that allows for imaging at and beyond a telescope's diffraction limit. The technique is ideal for searching for stellar companions at small separations from their host star; however, previous analyses of SAM observations of young stars surrounded by dusty disks have had difficulties disentangling planet and extended disk emission. We analyze VLT/SPHERE-IRDIS SAM observations of the transition disk LkCa 15, model the extended disk emission, probe for planets at small separations, and improve contrast limits for planets. We fit geometrical models directly to the interferometric observables and recover previously observed extended disk emission. We use dynamic nested sampling to estimate uncertainties on our model parameters and to calculate evidences to perform model comparison. We compare our extended disk emission models against point-source models to robustly conclude that the system is dominated by extended emission within 50 au. We report detections of two previously observed asymmetric rings at ~17 and ~45 au. The peak brightness location of each model ring is consistent with the previous observations. We also, for the first time with imaging, robustly recover an elliptical Gaussian inner disk, previously inferred via SED fitting. This inner disk has an FWHM of 5 au and a similar inclination and orientation to the outer rings. Finally, we recover no clear evidence for candidate planets. By modeling the extended disk emission, we are able to place a lower limit on the near-infrared companion contrast of at least 1000.
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insu-03690858 , version 1 (08-06-2022)

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Attribution - CC BY 4.0

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Dori Blakely, Logan Francis, Doug Johnstone, Anthony Soulain, Peter Tuthill, et al.. Two Rings and a Marginally Resolved, 5 au Disk around LkCa 15 Identified via Near-infrared Sparse Aperture Masking Interferometry. The Astrophysical Journal, 2022, 931, ⟨10.3847/1538-4357/ac6586⟩. ⟨insu-03690858⟩
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