TOI 564 b and TOI 905 b: Grazing and Fully Transiting Hot Jupiters Discovered by TESS

Allen B. Davis, Songhu Wang, Matias Jones, Jason D. Eastman, Maximilian N. Günther, Keivan G. Stassun, Brett C. Addison, Karen A. Collins, Samuel N. Quinn, David W. Latham, Trifon Trifonov, Sahar Shahaf, Tsevi Mazeh, Stephen R. Kane, Xian-Yu Wang, Thiam-Guan Tan, Andrei Tokovinin, Carl Ziegler, René Tronsgaard, Sarah MillhollandBryndis Cruz, Perry Berlind, Michael L. Calkins, Gilbert A. Esquerdo, Kevin I. Collins, Dennis M. Conti, Phil Evans, Pablo Lewin, Don J. Radford, Leonardo A. Paredes, Todd J. Henry, Hodari-Sadiki James, Nicholas M. Law, Andrew W. Mann, César Briceño, George R. Ricker, Roland Vanderspek, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Akshata Krishnamurthy, Natalie M. Batalha, Jennifer Burt, Knicole D. Colón, Scott Dynes, Douglas A. Caldwell, Robert Morris, Christopher E. Henze, Debra A. Fischer

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Abstract

We report the discovery and confirmation of two new hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS): TOI 564 b and TOI 905 b. The transits of these two planets were initially observed by TESS with orbital periods of 1.651 d and 3.739 d, respectively. We conducted follow-up observations of each system from the ground, including photometry in multiple filters, speckle interferometry, and radial velocity measurements. For TOI 564 b, our global fitting revealed a classical hot Jupiter with a mass of 1.463+0.10−0.096 MJ and a radius of 1.02+0.71/−0.29 RJ. TOI 905 b is a classical hot Jupiter as well, with a mass of 0.667+0.042/−0.041 MJ and radius of 1.171+0.053/−0.051 RJ. Both planets orbit Sun-like, moderately bright, mid-G dwarf stars with V ~ 11. While TOI 905 b fully transits its star, we found that TOI 564 b has a very high transit impact parameter of 0.994+0.083/−0.049, making it one of only ~20 known systems to exhibit a grazing transit and one of the brightest host stars among them. TOI 564 b is therefore one of the most attractive systems to search for additional non-transiting, smaller planets by exploiting the sensitivity of grazing transits to small changes in inclination and transit duration over the time scale of several years.
Original languageEnglish
Article number229
JournalAstrophysical Journal
Volume160
Issue number5
Number of pages17
ISSN0004-637X
DOIs
Publication statusPublished - 2020

Keywords

  • Planetary systems, planets and satellites: detection
  • Stars: individual (TIC 1003831, TOI 564, TIC 261867566, TOI 905)

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