The Multiplanet System TOI-421: A Warm Neptune and a Super Puffy Mini-Neptune Transiting a G9 V Star in a Visual Binary

• Published in: The Astronomical Journal
• Main Authors: Carleo, Ilaria, Gandolfi, Davide, Barragan, Oscar, Livingston, John H., Persson, Carina M., Lam, Kristine W.F., Vidotto, Aline, Lund, Michael B., D'Angelo, Carolina Villarreal, Collins, Karen A., Fossati, Luca, Howard, Andrew W., Kubyshkina, Daria, Brahm, Rafael, Oklopvić, Antonija, Mollière, Paul, Redfield, Seth, Serrano, Luisa Maria, Dai, Fei, Fridlund, Malcolm, Borsa, Francesco, Korth, Judith, Esposito, Massimiliano, Díaz, Matías R., Nielsen, Louise Dyregaard, Hellier, Coel, Mathur, Savita, Deeg, Hans J., Hatzes, Artie P., Benatti, Serena, Rodler, Florian, Alarcon, Javier, Spina, Lorenzo, Santos, Ângela R.G., Georgieva, Iskra, Garcia, Rafael A., Gonzalez-Cuesta, Lucia, Ricker, George R., Vanderspek, Roland, Latham, David W., Seager, Sara, Winn, Joshua N., Jenkins, Jon M., Albrecht, Simon, Batalha, Natalie M., Beard, Corey, Boyd, Patricia T., Bouchy, Francois, Burt, Jennifer A., Butler, R. Paul, Cabrera Perez, Juan, Chontos, Ashley, Ciardi, David R., Cochran, William D., Collins, Kevin I., Crane, Jeffrey D., Crossfield, Ian J.M., Csizmadia, Szilard, Dragomir, Diana, Dressing, Courtney, Eigmüller, Philipp, Endl, Michael, Erikson, Anders, Espinoza, Néstor, Fausnaugh, Michael, Feng, Fabo, Flowers, Erin, Fulton, Benjamin, Gonzales, Erica J., Grieves, Nolan, Grziwa, Sascha, Guenther, Eike W., Guerrero, Natalia M., Henning, Thomas, Hidalgo, Diego, Hirano, Teruyuki, Hjorth, Maria, Huber, Daniel, Isaacson, Howard, Jones, Matias, Jordán, Andrés, Kabath, Petr, Kane, Stephen R., Knudstrup, Emil, Lubin, Jack, Luque, Rafael, Mireles, Ismael, Narita, Norio, Nespral, David, Niraula, Prajwal, Nowak, Grzegorz, Palle, Enric, Pätzold, Martin, Petigura, Erik A., Prieto-Arranz, Jorge, Rauer, H, Robertson, Paul, Rose, Mark E., Roy, Arpita, Sarkis, Paula, Schlieder, Joshua E., Ségransan, Damien, Shectman, Stephen, Skarka, Marek, Smith, Alexis M.S., Smith, Jeffrey C., Stassun, Keivan G., Teske, Johanna K., Twicken, Joseph D., Van Eylen, Vincent, Wang, Sharon X., Weiss, Lauren M., Wyttenbach, Aurélien
• Format: Other Non-Article Part of Journal/Newspaper
• Language: English
• Published: American Astronomical Society 2020
• Subjects: Extrasolare Planeten und Atmosphären; Leitungsbereich PF; Norway; Observatorio; Iceland
• Online Access: https://elib.dlr.de/137492/; https://elib.dlr.de/137492/1/Carleo_2020_AJ_160_114.pdf; https://iopscience.iop.org/article/10.3847/1538-3881/aba124

We report the discovery of a warm Neptune and a hot sub-Neptune transiting TOI-421 (BD-14 1137, TIC 94986319), a bright (V = 9.9) G9 dwarf star in a visual binary system observed by the Transiting Exoplanet Survey Satellite (TESS) space mission in Sectors 5 and 6. We performed ground-based follow-up...