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Detecting Unresolved Binaries in TESS Data with Speckle Imaging

Matson, Rachel A. and Howell, Steve B. and Ciardi, David R. (2019) Detecting Unresolved Binaries in TESS Data with Speckle Imaging. Astronomical Journal, 157 (5). Art. No. 211. ISSN 1538-3881. doi:10.3847/1538-3881/ab1755.

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The Transiting Exoplanet Survey Satellite (TESS) is conducting a two-year wide-field survey searching for transiting exoplanets around nearby bright stars that will be ideal for follow-up characterization. To facilitate studies of planet compositions and atmospheric properties, accurate and precise planetary radii need to be derived from the transit light curves. Since 40%–50% of exoplanet host stars are in multiple star systems, however, the observed transit depth may be diluted by the flux of a companion star, causing the radius of the planet to be underestimated. High angular resolution imaging can detect companion stars that are not resolved in the TESS Input Catalog, or by seeing-limited photometry, to validate exoplanet candidates and derive accurate planetary radii. We examine the population of stellar companions that will be detectable around TESS planet candidate host stars, and those that will remain undetected, by applying the detection limits of speckle imaging to the simulated host star populations of Sullivan et al. and Barclay et al. By detecting companions with contrasts of Δm ≾ 7–9 and separations of ~0."02–1."2, speckle imaging can detect companion stars as faint as early M stars around A–F stars and stars as faint as mid-M around G–M stars, as well as up to 99% of the expected binary star distribution for systems located within a few hundred parsecs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Matson, Rachel A.0000-0001-7233-7508
Howell, Steve B.0000-0002-2532-2853
Ciardi, David R.0000-0002-5741-3047
Additional Information:© 2019. The American Astronomical Society. Received 2018 November 2; revised 2019 March 22; accepted 2019 April 5; published 2019 May 6. The authors would like to thank all of the excellent staff at the WIYN and Gemini telescopes for their help during our observing runs. We gratefully acknowledge the support for our speckle imaging program given by the NASA Exoplanet Exploration Program and the role of the Kepler Science Office in upgrading DSSI to the two-EMCCD mode. This research has made use of the NASA Exoplanet Archive and the Exoplanet Follow-up Observation Program website, which are operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program. R.M.'s research was supported by an appointment to the NASA Postdoctoral Program at the NASA Ames Research Center, administered by Universities Space Research Association under contract with NASA. Facilities: WIYN - Wisconsin-Indiana-Yale-NOAO Telescope, Gemini:Gillett - , Gemini:South. - Software: Python, Numpy, Matplotlib, SciPy, AstroPy, Jupyter Notebook.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:binaries: general; binaries: visual; planetary systems; techniques: high angular resolution
Issue or Number:5
Record Number:CaltechAUTHORS:20190507-111647032
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Official Citation:Rachel A. Matson et al 2019 AJ 157 211
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95299
Deposited By: George Porter
Deposited On:07 May 2019 20:14
Last Modified:16 Nov 2021 17:11

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