Molecules with ALMA at Planet-forming Scales (MAPS). XIII. HCO$^+$ and Disk Ionization Structure
Yuri Aikawa,
Gianni Cataldi,
Yoshihide Yamato,
Ke Zhang,
Alice S. Booth,
Kenji Furuya,
Sean M. Andrews,
Jaehan Bae,
Edwin A. Bergin,
Jennifer B. Bergner,
Arthur D. Bosman,
L. Ilsedore Cleeves,
Ian Czekala,
Viviana V. Guzmán,
Jane Huang,
John D. Ilee,
Charles J. Law,
Romane Le Gal,
Ryan A. Loomis,
François Ménard,
Hideko Nomura,
Karin I. Öberg,
Chunhua Qi,
Kamber R. Schwarz,
Richard Teague,
Takashi Tsukagoshi,
Catherine Walsh,
David J. Wilner