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

November 2020 • 2020AJ....160..229D

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

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 and 3.739 days, 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 ${1.463}_{-0.096}^{+0.10}$ MJ and a radius of ${1.02}_{-0.29}^{+0.71}$ RJ. Also a classical hot Jupiter, TOI 905 b has a mass of ${0.667}_{-0.041}^{+0.042}$ MJ and radius of ${1.171}_{-0.051}^{+0.053}$ 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 ${0.994}_{-0.049}^{+0.083}$ , making it one of only ∼20 known systems to exhibit a grazing transit and one of the brightest host stars among them. Therefore, TOI 564 b is one of the most attractive systems to search for additional nontransiting, smaller planets by exploiting the sensitivity of grazing transits to small changes in inclination and transit duration over a timescale of several years.


IPAC Authors


Jessie Christiansen

Associate Scientist


David Ciardi

Senior Scientist