On the Transit Potential of the Planet Orbiting iota Draconis

Abstract

Most of the known transiting exoplanets are in short-period orbits, largely due to the bias inherent in detecting planets through the transit technique. However, the eccentricity distribution of the known radial velocity planets results in many of those planets having a non-negligible transit probability. One such case is the massive planet orbiting the giant star iota Draconis, a situation where both the orientation of the planet's eccentric orbit and the size of the host star inflate the transit probability to a much higher value than for a typical hot Jupiter. Here we present a revised fit of the radial velocity data with new measurements and a photometric analysis of the stellar variability. We provide a revised transit probability, an improved transit ephemeris, and discuss the prospects for observing a transit of this planet from both the ground and space.

6 pages, 7 figures, accepted for publication in ApJ. Radial velocities will be made available in the on-line version and through the NASA Star and Exoplanet Database (NStED). Minor corrections from ApJ proof have been applied

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• The Pan-Pacific Planet Search VII: The most eccentric planet orbiting a giant star
• Limits on Stellar Companions to Exoplanet Host Stars With Eccentric Planets
• Improved Orbital Parameters and Transit Monitoring for HD 156846b
• Fundamental Parameters of the Exoplanet Host K Giant Star iota Draconis from the CHARA Array
• HD 76920b pinned down: a detailed analysis of the most eccentric planetary system around an evolved star
• Revisiting the Red-giant Branch Hosts KOI-3886 and $\iota$ Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters
• High-Contrast Imaging of Intermediate-Mass Giants with Long-Term Radial Velocity Trends
• TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting An Extremely Eccentric Exoplanet
• Precise radial velocities of giant stars -- XVII. Distinguishing planets from intrinsically induced radial velocity signals in evolved stars
• Asteroseismology of iota Draconis and Discovery of an Additional Long-Period Companion