New spatially resolved observations of the T cha transition disk and constraints on the previously claimed substellar companion

S. Sallum, J. A. Eisner, Laird M. Close, Philip M. Hinz, Andrew J. Skemer, Vanessa Bailey, Runa Briguglio, Katherine B. Follette, Jared R. Males, Katie M. Morzinski, Alfio Puglisi, Timothy J. Rodigas, Alycia J. Weinberger, Marco Xompero

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Abstract

We present multi-epoch non-redundant masking observations of the T Cha transition disk, taken at the Very Large Telescope and Magellan in the H, Ks, and L′ bands. T Cha is one of a small number of transition disks that host companion candidates discovered by high-resolution imaging techniques, with a putative companion at a position angle of 78°, separation of 62 mas, and contrast of ΔL′ = 5.1 mag. We find comparable binary parameters in our re-reduction of the initial detection images, and similar parameters in the 2011 L′, 2013 NaCo L′, and 2013 NaCo Ks data sets. We find a close-in companion signal in the 2012 NaCo L′ data set that cannot be explained by orbital motion, and a non-detection in the 2013 MagAO/Clio2 L′ data. However, Monte Carlo simulations show that the best fits to the 2012 NaCo and 2013 MagAO/Clio2 followup data may be consistent with noise. There is also a significant probability of false non-detections in both of these data sets. We discuss physical scenarios that could cause the best fits, and argue that previous companion and scattering explanations are inconsistent with the results of the much larger data set presented here.

Original languageEnglish (US)
Article number85
JournalAstrophysical Journal
Volume801
Issue number2
DOIs
StatePublished - Mar 10 2015

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Keywords

  • instrumentation: high angular resolution
  • protoplanetary disks
  • stars: individual (T Cha)
  • techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Sallum, S., Eisner, J. A., Close, L. M., Hinz, P. M., Skemer, A. J., Bailey, V., Briguglio, R., Follette, K. B., Males, J. R., Morzinski, K. M., Puglisi, A., Rodigas, T. J., Weinberger, A. J., & Xompero, M. (2015). New spatially resolved observations of the T cha transition disk and constraints on the previously claimed substellar companion. Astrophysical Journal, 801(2), [85]. https://doi.org/10.1088/0004-637X/801/2/85