VizieR Online Data Catalog: Radial velocities of systems hosting sub-Saturns (Petigura+, 2017)

We observed K2-27, K2-32, K2-39, and K2-108 using the High Resolution Echelle Spectrometer (HIRES) on the 10 m Keck Telescope I.

K2-27 hosts a single transiting sub-Saturn, K2-27b, with P=6.77 days that was first confirmed in Van Eylen et al. (2016ApJ...820...56V) using RVs. We obtained 15 spectra of K2-27 with HIRES between 2015 February 5 and 2016 July 17. Van Eylen et al. (2016ApJ...820...56V) observed this star with HARPS, HARPS-N, and FIES. We included 6 and 19 measurements from HARPS and HARPS-N, respectively in our radial velocity analysis.

K2-32 hosts three planets, K2-32b, K2-32c, and K2-32d, having orbital periods of P=8.99 days, 20.66 days, and 31.7 days, respectively, which are near the 3:2:1 period commensurability. The planets were first confirmed in Sinukoff et al. (2016ApJ...827...78S) using multiplicity arguments (Lissauer et al. 2012ApJ...750..112L). We obtained 31 spectra of K2-32 with HIRES between 2015 June 06 and 2016 August 20. Dai et al. (2016ApJ...823..115D) obtained 43 spectra with HARPS and 6 with PFS, which we included in our radial velocity analysis.

K2-39 hosts a single transiting planet, K2-39b, with P=4.60 days, which was first confirmed by Van Eylen et al. (2016AJ....152..143V). We obtained 42 spectra of K2-39 with HIRES between 2015 August 10 and 2016 August 21. Van Eylen et al. (2016AJ....152..143V) obtained 7 spectra with HARPS, 6 with PFS, and 17 with FIES.

K2-108, listed as EPIC-211736671 in the Ecliptic Planet Input Catalog (Huber et al. 2016, Cat. J/ApJS/224/2), is a V=12.3mag star observed during K2 Campaign 5. We identified K2-108 as a likely planet according to our team's standard methodology, described in detail in Crossfield et al. 2016 (Cat. J/ApJS/226/7). In brief, we identified a set of transits having P=4.73 days and elevated K2-108 to the status of "planet candidate". We obtained 20 spectra of K2-108 with HIRES between 2015 December 23 and 2016 November 25.

(2 data files).