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Speckle Observations of TESS Exoplanet Host Stars: Understanding the Binary Exoplanet Host Star Orbital Period Distribution

Howell, Steve B. and Matson, Rachel A. and Ciardi, David R. and Everett, Mark E. and Livingston, John H. and Scott, Nicholas J. and Horch, Elliott P. and Winn, Joshua N. (2021) Speckle Observations of TESS Exoplanet Host Stars: Understanding the Binary Exoplanet Host Star Orbital Period Distribution. Astronomical Journal, 161 (4). Art. No. 164. ISSN 0004-6256. doi:10.3847/1538-3881/abdec6.

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We present high-resolution speckle interferometric imaging observations of TESS exoplanet host stars using the NN-EXPLORE Exoplanet and Stellar Speckle Imager instrument at the 3.5 m WIYN telescope. Eight TESS objects of interest that were originally discovered by Kepler were previously observed using the Differential Speckle Survey Instrument. Speckle observations of 186 TESS stars were carried out, and 45 (24%) likely bound companions were detected. This is approximately the number of companions we would expect to observe given the established 46% binarity rate in exoplanet host stars. For the detected binaries, the distribution of stellar mass ratio is consistent with that of the standard Raghavan distribution and may show a decrease in high-q systems as the binary separation increases. The distribution of binary orbital periods, however, is not consistent with the standard Ragahavan model, and our observations support the premise that exoplanet-hosting stars with binary companions have, in general, wider orbital separations than field binaries. We find that exoplanet-hosting binary star systems show a distribution peaking near 100 au, higher than the 40–50 au peak that is observed for field binaries. This fact led to earlier suggestions that planet formation is suppressed in close binaries.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Howell, Steve B.0000-0002-2532-2853
Matson, Rachel A.0000-0001-7233-7508
Ciardi, David R.0000-0002-5741-3047
Everett, Mark E.0000-0002-0885-7215
Livingston, John H.0000-0002-4881-3620
Scott, Nicholas J.0000-0003-1038-9702
Horch, Elliott P.0000-0003-2159-1463
Winn, Joshua N.0000-0002-4265-047X
Additional Information:© 2021. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2020 November 2; revised 2021 January 19; accepted 2021 January 20; published 2021 March 4. The observations in the paper made use of the NN-EXPLORE Exoplanet and Stellar Speckle Imager (NESSI). NESSI was funded by the NASA Exoplanet Exploration Program and the NASA Ames Research Center. NESSI was built at the Ames Research Center by Steve B. Howell, Nic Scott, Elliott P. Horch, and Emmett Quigley. This research has made use of the NASA Exoplanet Archive and ExoFOP, which are operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. J.N.W. acknowledges funding from the NASA-WIYN Data Analysis program (JPL contract 1597372). Facilities: WIYN - NESSI - , DSSI. - Software: astropy (The Astropy Collaboration 2013, 2018), SciPy (Virtanen et al. 2020).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:Exoplanets
Issue or Number:4
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanets (498)
Record Number:CaltechAUTHORS:20210308-082258119
Persistent URL:
Official Citation:Steve B. Howell et al 2021 AJ 161 164
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108335
Deposited By: Tony Diaz
Deposited On:08 Mar 2021 21:00
Last Modified:16 Nov 2021 19:11

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