HIRES radial velocity follow up of HD 17156

The first known such planets were generally discovered using the radial velocity technique, then later found to transit. HD17156b is particularly notable among these initial discoveries because it diverged from the typical hot-Jupiter population, occupying a 21.2day eccentric (e=0.68) orbit, offering preliminary insights into the evolution of planets in extreme orbits.

Here we present new data for this system, including ground- and space-based photometry, radial velocities, and speckle imaging, that further constrain the system properties and stellar/planetary multiplicity. These data include photometry from the Transiting Exoplanet Survey Satellite that cover five transits of the known planet. We show that the system does not harbor any additional giant planets interior to 10au.