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High-contrast Imaging around a 2 Myr-old CI Tau with a Close-in Gas Giant

Shimizu, Toshinori and Uyama, Taichi and Hori, Yasunori and Tamura, Motohide and Wallack, Nicole (2023) High-contrast Imaging around a 2 Myr-old CI Tau with a Close-in Gas Giant. Astronomical Journal, 165 (1). Art. No. 20. ISSN 0004-6256. doi:10.3847/1538-3881/ac9fd1.

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Giant planets around young stars serve as a clue to unveiling their formation history and orbital evolution. CI Tau is a 2 Myr-old classical T Tauri star hosting an eccentric hot Jupiter, CI Tau b. The standard formation scenario of a hot Jupiter predicts that planets formed further out and migrated inward. A high eccentricity of CI Tau b may be suggestive of high-e migration due to secular gravitational perturbations by an outer companion. Also, the Atacama Large Millimeter/submillimeter Array 1.3 mm-continuum observations show that CI Tau has at least three annular gaps in which unseen planets may exist. We present high-contrast imaging around CI Tau taken from the Keck/NIRC2 _(L')-band filter and vortex coronagraph that allows us to search for an outer companion. We did not detect any outer companion around CI Tau from angular differential imaging (ADI) using two deep imaging data sets. The detection limits from ADI-reduced images rule out the existence of an outer companion beyond ∼30 au that can cause the Kozai–Lidov migration of CI Tau b. Our results suggest that CI Tau b may have experienced type II migration from ≲2 au in megayears. We also confirm that no planets with ≥ 2–4 M_Jup are hidden in two outer gaps.

Item Type:Article
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URLURL TypeDescription
Uyama, Taichi0000-0002-6879-3030
Hori, Yasunori0000-0003-4676-0251
Tamura, Motohide0000-0002-6510-0681
Wallack, Nicole0000-0003-0354-0187
Additional Information:We are grateful to Dimitri Mawet and Garreth Ruane for sharing the NIRC2 data taken in their observational programs. T.U. is supported by Grant-in-Aid for Japan Society for the Promotion of Science (JSPS) Fellows and JSPS KAKENHI grant No. JP21J01220. Y.H. was partly supported by JSPS KAKENHI grant No. 18H05439. M.T. is supported by JSPS KAKENHI grant Nos. 18H05442, 15H02063, and 22000005. This research is partially supported by NASA ROSES XRP, award 80NSSC19K0294. The data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)JP21J01220
Japan Society for the Promotion of Science (JSPS)18H05439
Japan Society for the Promotion of Science (JSPS)18H05442
Japan Society for the Promotion of Science (JSPS)15H02063
Japan Society for the Promotion of Science (JSPS)22000005
W. M. Keck FoundationUNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20230117-369491100.15
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118811
Deposited By: Research Services Depository
Deposited On:10 Feb 2023 17:05
Last Modified:10 Feb 2023 17:05

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