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Title: NEW SPATIALLY RESOLVED OBSERVATIONS OF THE T Cha TRANSITION DISK AND CONSTRAINTS ON THE PREVIOUSLY CLAIMED SUBSTELLAR COMPANION

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.

Authors:
; ; ; ; ; ; ; ;  [1]; ; ;  [2]; ;  [3]
  1. Astronomy Department, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)
  2. INAF-Osservatorio Astrofisico di Arcetri, I-50125 Firenze (Italy)
  3. Carnegie Institution DTM, 5241 Broad Branch Rd, Washington, DC 20015 (United States)
Publication Date:
OSTI Identifier:
22522083
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 801; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DETECTION; IMAGES; LIMITING VALUES; MONTE CARLO METHOD; NOISE; PROTOPLANETS; RESOLUTION; SCATTERING; STARS; TELESCOPES

Citation Formats

Sallum, S., Eisner, J. A., Close, Laird M., Hinz, Philip M., Skemer, Andrew J., Bailey, Vanessa, Follette, Katherine B., Males, Jared R., Morzinski, Katie M., Briguglio, Runa, Puglisi, Alfio, Xompero, Marco, Rodigas, Timothy J., and Weinberger, Alycia J., E-mail: ssallum@email.arizona.edu. NEW SPATIALLY RESOLVED OBSERVATIONS OF THE T Cha TRANSITION DISK AND CONSTRAINTS ON THE PREVIOUSLY CLAIMED SUBSTELLAR COMPANION. United States: N. p., 2015. Web. doi:10.1088/0004-637X/801/2/85.
Sallum, S., Eisner, J. A., Close, Laird M., Hinz, Philip M., Skemer, Andrew J., Bailey, Vanessa, Follette, Katherine B., Males, Jared R., Morzinski, Katie M., Briguglio, Runa, Puglisi, Alfio, Xompero, Marco, Rodigas, Timothy J., & Weinberger, Alycia J., E-mail: ssallum@email.arizona.edu. NEW SPATIALLY RESOLVED OBSERVATIONS OF THE T Cha TRANSITION DISK AND CONSTRAINTS ON THE PREVIOUSLY CLAIMED SUBSTELLAR COMPANION. United States. doi:10.1088/0004-637X/801/2/85.
Sallum, S., Eisner, J. A., Close, Laird M., Hinz, Philip M., Skemer, Andrew J., Bailey, Vanessa, Follette, Katherine B., Males, Jared R., Morzinski, Katie M., Briguglio, Runa, Puglisi, Alfio, Xompero, Marco, Rodigas, Timothy J., and Weinberger, Alycia J., E-mail: ssallum@email.arizona.edu. Tue . "NEW SPATIALLY RESOLVED OBSERVATIONS OF THE T Cha TRANSITION DISK AND CONSTRAINTS ON THE PREVIOUSLY CLAIMED SUBSTELLAR COMPANION". United States. doi:10.1088/0004-637X/801/2/85.
@article{osti_22522083,
title = {NEW SPATIALLY RESOLVED OBSERVATIONS OF THE T Cha TRANSITION DISK AND CONSTRAINTS ON THE PREVIOUSLY CLAIMED SUBSTELLAR COMPANION},
author = {Sallum, S. and Eisner, J. A. and Close, Laird M. and Hinz, Philip M. and Skemer, Andrew J. and Bailey, Vanessa and Follette, Katherine B. and Males, Jared R. and Morzinski, Katie M. and Briguglio, Runa and Puglisi, Alfio and Xompero, Marco and Rodigas, Timothy J. and Weinberger, Alycia J., E-mail: ssallum@email.arizona.edu},
abstractNote = {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.},
doi = {10.1088/0004-637X/801/2/85},
journal = {Astrophysical Journal},
number = 2,
volume = 801,
place = {United States},
year = {Tue Mar 10 00:00:00 EDT 2015},
month = {Tue Mar 10 00:00:00 EDT 2015}
}