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Gonzales, Eric L. N. Jensen, Eric Palle, Erik A. Petigura, Fei Dai, Felipe Murgas, George Ricker, Hannu Parviainen, Howard Isaacson, Ian J. M> Crossfield, Jack Lubin, Jack S. Acton, Jessie L. Christiansen, John M. Brewer, Jon Jenkins, Joseph D. Twicken, Joseph M. Akana Murphy, Joshua E. Schlieder, Joshua N. Winn, Judan van Zandt, Karen A. Collins, Keivan G. Stassun, Kevin I. Collins, Lauren M. Weiss, Lee J. Rosenthal, Mason G. MacDougall, Michael B. Lund, Michelle L. Hill, Molly R. Kosiarek, Natalie M. Batalha, Nicholas Law, Norio Narita, Paul A. Dalba, Paul Robertson, Phil Evans, Philipp Eigm\\\"uller, Rachel A. Matson, Richard P. Schwarz, Ryan A. Rubenzahl, Sam Gill, Sara Seager, Stephen R. Kane, Steve B. Howell, Steven Giacalone, Teo Mocnik, Thiam-Guan Tan, Zachary R. Claytor","submitted_at":"2020-09-07T12:52:16Z","abstract_excerpt":"We report the discovery of TOI-561, a multi-planet system in the galactic thick disk that contains a rocky, ultra-short period planet (USP). This bright ($V=10.2$) star hosts three small transiting planets identified in photometry from the NASA TESS mission: TOI-561 b (TOI-561.02, P=0.44 days, $R_b = 1.45\\pm0.11\\,R_\\oplus$), c (TOI-561.01, P=10.8 days, $R_c=2.90\\pm0.13\\,R_\\oplus$), and d (TOI-561.03, P=16.3 days, $R_d=2.32\\pm0.16\\,R_\\oplus$). 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