HD 219134 Revisited: Planet d Transit Upper Limit and Planet f Transit Nondetection with ASTERIA and TESS
Vanderburg, Andrew; Latham, David W.; Schlieder, Joshua E.; Collins, Karen A.; Wohler, Bill; Vanderspek, Roland; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Caldwell, Douglas A.; Shporer, Avi; Dragomir, Diana; Huang, Chelsea X.; Twicken, Joseph D.; Fausnaugh, Michael; Demory, Brice-Olivier; Ricker, George; Krishnamurthy, Akshata; Glidden, Ana; Knapp, Mary; Agusti, Mariona Badenas; Weisserman, Drew; Becker, Juliette; Smith, Matthew; Pong, Christopher M.; Bailey, Vanessa P.; Donner, Amanda; Di Pasquale, Peter; Campuzano, Brian; Smith, Colin; Luu, Jason; Babuscia, Alessandra; Bocchino, Robert L., Jr.; Loveland, Jessica; Colley, Cody; Gedenk, Tobias; Kulkarni, Tejas; Hughes, Kyle; White, Mary; Krajewski, Joel; Fesq, Lorraine
United States, Switzerland, Spain, Sweden
Abstract
HD 219134 is a K3V dwarf star with six reported radial-velocity discovered planets. The two innermost planets b and c show transits, raising the possibility of this system to be the nearest (6.53 pc), brightest (V = 5.57) example of a star with a compact multiple transiting planet system. Ground-based searches for transits of planets beyond b and c are not feasible because of the infrequent transits, long transit duration (∼5 hr), shallow transit depths (<1%), and large transit time uncertainty (∼half a day). We use the space-based telescopes the Arcsecond Space Telescope Enabling Research in Astrophysics (ASTERIA) and the Transiting Exoplanet Survey Satellite (TESS) to search for transits of planets f (P = 22.717 days and $M\sin i=7.3\pm 0.04{M}_{\oplus }$ ) and d (P = 46.859 days and $M\sin i=16.7\pm 0.64{M}_{\oplus }$ ). ASTERIA was a technology demonstration CubeSat with an opportunity for science in an extended program. ASTERIA observations of HD 219134 were designed to cover the 3σ transit windows for planets f and d via repeated visits over many months. While TESS has much higher sensitivity and more continuous time coverage than ASTERIA, only the HD 219134 f transit window fell within the TESS survey's observations. Our TESS photometric results definitively rule out planetary transits for HD 219134 f. We do not detect the Neptune-mass HD 219134 d transits and our ASTERIA data are sensitive to planets as small as 3.6 R⊕. We provide TESS updated transit times and periods for HD 219134 b and c, which are designated TOI 1469.01 and 1469.02 respectively.