%AWeiss, Lauren%ADai, Fei%AHuber, Daniel%ABrewer, John%ACollins, Karen%ACiardi, David%AMatthews, Elisabeth%AZiegler, Carl%AHowell, Steve%ABatalha, Natalie%ACrossfield, Ian%ADressing, Courtney%AFulton, Benjamin%AHoward, Andrew%AIsaacson, Howard%AKane, Stephen%APetigura, Erik%ARobertson, Paul%ARoy, Arpita%ARubenzahl, Ryan%ATwicken, Joseph%AClaytor, Zachary%AStassun, Keivan%AMacDougall, Mason%AChontos, Ashley%AGiacalone, Steven%ADalba, Paul%AMocnik, Teo%AHill, Michelle%ABeard, Corey%AAkana Murphy, Joseph%ARosenthal, Lee%ABehmard, Aida%AVan Zandt, Judah%ALubin, Jack%AKosiarek, Molly%ALund, Michael%AChristiansen, Jessie%AMatson, Rachel%ABeichman, Charles%ASchlieder, Joshua%AGonzales, Erica%ABriceño, César%ALaw, Nicholas%AMann, Andrew%ACollins, Kevin%AEvans, Phil%AFukui, Akihiko%AJensen, Eric%AMurgas, Felipe%ANarita, Norio%APalle, Enric%AParviainen, Hannu%ASchwarz, Richard%ATan, Thiam-Guan%AActon, Jack%ABryant, Edward%AChaushev, Alexander%AGill, Sam%AEigmüller, Philipp%AJenkins, Jon%ARicker, George%ASeager, Sara%AWinn, Joshua%Anull Ed.%BJournal Name: The Astronomical Journal; Journal Volume: 161; Journal Issue: 2 %D2021%I %JJournal Name: The Astronomical Journal; Journal Volume: 161; Journal Issue: 2 %K %MOSTI ID: 10214802 %PMedium: X %TThe TESS-Keck Survey. II. An Ultra-short-period Rocky Planet and Its Siblings Transiting the Galactic Thick-disk Star TOI-561 %X %0Journal Article