The TESS-Keck Survey. XVI. Mass Measurements for 12 Planets in Eight Systems
Anderson, Jay; Dattilo, Anne; Batalha, Natalie M.; Valenti, Jeff A.; Mayo, Andrew W.; Rice, Malena; Kane, Stephen R.; Huber, Daniel; Rosenthal, Lee J.; Hirsch, Lea A.; Howard, Andrew W.; Petigura, Erik A.; Behmard, Aida; Chontos, Ashley; Crossfield, Ian J. M.; Dalba, Paul A.; Rubenzahl, Ryan A.; Weiss, Lauren M.; Fetherolf, Tara; Ciardi, David R.; Dai, Fei; Twicken, Joseph D.; Angelo, Isabel; Giacalone, Steven; Dressing, Courtney D.; Gonzales, Erica J.; Fulton, Benjamin; Robertson, Paul; Roy, Arpita; Blunt, Sarah; Polanski, Alex S.; Isaacson, Howard; Močnik, Teo; Beard, Corey; Holcomb, Rae; Lubin, Jack; Akana Murphy, Joseph M.; Brinkman, Casey L.; Hill, Michelle L.; MacDougall, Mason G.; Scarsdale, Nicholas; Tyler, Dakotah; Van Zandt, Judah; Kosiarek, Molly R.; Gilbert, Emily A.; Pidhorodetska, Daria; Turtelboom, Emma V.; Louden, Emma M.
United States, Australia, Canada
Abstract
With JWST's successful deployment and unexpectedly high fuel reserves, measuring the masses of sub-Neptunes transiting bright, nearby stars will soon become the bottleneck for characterizing the atmospheres of small exoplanets via transmission spectroscopy. Using a carefully curated target list and observations from more than 2 yr of APF-Levy and Keck-HIRES Doppler monitoring, the TESS-Keck Survey is working toward alleviating this pressure. Here we present mass measurements for 11 transiting planets in eight systems that are particularly suited to atmospheric follow-up with JWST. We also report the discovery and confirmation of a temperate super-Jovian-mass planet on a moderately eccentric orbit. The sample of eight host stars, which includes one subgiant, spans early-K to late-F spectral types (T eff = 5200-6200 K). We homogeneously derive planet parameters using a joint photometry and radial velocity modeling framework, discuss the planets' possible bulk compositions, and comment on their prospects for atmospheric characterization.