Science Extraction from TESS Observations of Known Exoplanet Hosts

Abstract

The transit method of exoplanet discovery and characterization has enabled numerous breakthroughs in exoplanetary science. These include measurements of planetary radii, mass-radius relationships, stellar obliquities, bulk density constraints on interior models, and transmission spectroscopy as a means to study planetary atmospheres. The Transiting Exoplanet Survey Satellite (TESS) has added to the exoplanet inventory by observing a significant fraction of the celestial sphere, including many stars already known to host exoplanets. Here we describe the science extraction from TESS observations of known exoplanet hosts during the primary mission. These include transit detection of known exoplanets, discovery of additional exoplanets, detection of phase signatures and secondary eclipses, transit ephemeris refinement, and asteroseismology as a means to improve stellar and planetary parameters. We provide the statistics of TESS known host observations during Cycle 1 & 2, and present several examples of TESS photometry for known host stars observed with a long baseline. We outline the major discoveries from observations of known hosts during the primary mission. Finally, we describe the case for further observations of known exoplanet hosts during the TESS extended mission and the expected science yield.

12 pages, 7 figures, accepted for publication in PASP

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• The TESS Objects of Interest Catalog from the TESS Prime Mission
• Visible-light Phase Curves from the Second Year of the TESS Primary Mission
• The TESS-Keck Survey XX: 15 New TESS Planets and a Uniform RV Analysis of all Survey Targets
• Another Shipment of Six Short-Period Giant Planets from TESS
• The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars
• Transit Timing Variation of XO-3b: Evidence for Tidal Evolution of Hot Jupiter with High Eccentricity
• TOI-1801 b: A temperate mini-Neptune around a young M0.5 dwarf
• A dense mini-Neptune orbiting the bright young star HD 18599
• Revisiting the Red-giant Branch Hosts KOI-3886 and $\iota$ Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters
• Revised Properties and Dynamical History for the HD 17156 System
• Variability of Known Exoplanet Host Stars Observed by TESS
• TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting An Extremely Eccentric Exoplanet
• Pulsation in TESS Objects of Interest
• Null transit detections of 68 radial velocity exoplanets observed by TESS
• The TESS-Keck Survey. XIX. A Warm Transiting Sub-Saturn Mass Planet and a non-Transiting Saturn Mass Planet Orbiting a Solar Analog
• Revisiting the secondary eclipses of KELT-1b using TESS observations
• Revisiting BD-06 1339b: A Likely False Positive Caused by Stellar Activity