The TESS-Keck Survey. II. An Ultra-short-period Rocky Planet and Its Siblings Transiting the Galactic Thick-disk Star TOI-561

Weiss, Lauren M. and Dai, Fei and Huber, Daniel and Brewer, John M. and Collins, Karen A. and Ciardi, David R. and Matthews, Elisabeth C. and Ziegler, Carl and Howell, Steve B. and Batalha, Natalie M. and Crossfield, Ian J. M. and Dressing, Courtney and Fulton, Benjamin and Howard, Andrew W. and Isaacson, Howard and Kane, Stephen R. and Petigura, Erik A. and Robertson, Paul and Roy, Arpita and Rubenzahl, Ryan A. and Twicken, Joseph D. and Claytor, Zachary R. and Stassun, Keivan G. and MacDougall, Mason G. and Chontos, Ashley and Giacalone, Steven and Dalba, Paul A. and Mocnik, Teo and Hill, Michelle L. and Beard, Corey and Akana Murphy, Joseph M. and Rosenthal, Lee J. and Behmard, Aida and Van Zandt, Judah and Lubin, Jack and Kosiarek, Molly R. and Lund, Michael B. and Christiansen, Jessie L. and Matson, Rachel A. and Beichman, Charles A. and Schlieder, Joshua E. and Gonzales, Erica J. and Briceño, César and Law, Nicholas and Mann, Andrew W. and Collins, Kevin I. and Evans, Phil and Fukui, Akihiko and Jensen, Eric L. N. and Murgas, Felipe and Narita, Norio and Palle, Enric and Parviainen, Hannu and Schwarz, Richard P. and Tan, Thiam-Guan and Acton, Jack S. and Bryant, Edward M. and Chaushev, Alexander and Gill, Sam and Eigmüller, Philipp and Jenkins, Jon and Ricker, George and Seager, Sara and Winn, Joshua N.

AJ