Su, Kate Y. L., Kennedy, Grant M., Schlawin, Everett, Jackson, Alan P. and Rieke, G. H. (2022) A star-sized impact-produced dust clump in the terrestrial zone of the HD 166191 system. The Astrophysical Journal, 927 (2). 135. doi:10.3847/1538-4357/ac4bbb ISSN 0004-637X.

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Abstract

We report on five years of 3-5 micron photometry measurements obtained by warm Spitzer to track the dust debris emission in the terrestrial zone of HD 166191 in combination with simultaneous optical data. We show that the debris production in this young (~10 Myr) system increased significantly in early 2018 and reached a record high level (almost double by mid 2019) by the end of the Spitzer mission (early 2020), suggesting intense collisional activity in its terrestrial zone likely due to either initial assembling of terrestrial planets through giant impacts or dynamical shake-up from unseen planet-mass objects or recent planet migration. This intense activity is further highlighted by detecting a star-size dust clump, passing in front of the star, in the midst of its infrared brightening. We constrain the minimum size and mass of the clump using multiwavelength transit profiles and conclude that the dust clump is most likely created by a large impact involving objects of several hundred km in size with an apparent period of 142 days (i.e., 0.62 au assuming a circular orbit). The system's evolutionary state (right after the dispersal of its gas-rich disk) makes it extremely valuable to learn about the process of terrestrial planet formation and planetary architecture through future observations.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Infrared astronomy, Circumstellar matter, Circumstellar matter, Extrasolar planets, Deep space
Journal or Publication Title:	The Astrophysical Journal
Publisher:	Institute of Physics Publishing, Inc.
ISSN:	0004-637X
Official Date:	10 March 2022
Dates:	Date Event 10 March 2022 Published 12 January 2022 Accepted
Volume:	927
Number:	2
Article Number:	135
DOI:	10.3847/1538-4357/ac4bbb
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	18 March 2022
Date of first compliant Open Access:	21 March 2022
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID NNX17AF03G [NASA] National Aeronautics and Space Administration http://dx.doi.org/10.13039/100000104 80NSSC20K1002 [NASA] National Aeronautics and Space Administration http://dx.doi.org/10.13039/100000104 University Research Fellowship Royal Society http://dx.doi.org/10.13039/501100000288
Open Access Version:	ArXiv

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