Year: 2023
Type: article
Abstract: NASA’s Transiting Exoplanet Survey Satellite (TESS) mission has been uncovering a growing number of exoplanets orbiting nearby, bright stars. Most exoplanets that have been discovered by TESS orbit narrow-line, slow-rotating stars, facilitating the confirmation and mass determination of these worlds. We present the discovery of a hot Jupiter orbiting a rapidly rotating ( v sin ( i ) = 35.1 ± 1.0 km s−1) early F3V-dwarf, HD 115447 (TOI-778). The transit signal taken from Sectors 10 and 37 of TESS's initial detection of the exoplanet is combined with follow-up ground-based photometry and velocity measurements taken from Minerva-Australis, TRES, CORALIE, and CHIRON to confirm and characterize TOI-778 b. A joint analysis of the light curves and the radial velocity measurements yields a mass, a radius, and an orbital period for TOI-778 b of 2.76 − 0.23 + 0.24 M J, 1.370 ± 0.043 R J, and ∼4.63 days, respectively. The planet orbits a bright (V = 9.1 mag) F3-dwarf with M = 1.40 ± 0.05 M ⊙, R = 1.70 ± 0.05 R ⊙, and log g = 4.05 ± 0.17 . We observed a spectroscopic transit of TOI-778 b, which allowed us to derive a sky-projected spin–orbit angle of 18° ± 11°, consistent with an aligned planetary system. This discovery demonstrates the capability of smaller-aperture telescopes such as Minerva-Australis to detect the radial velocity signals produced by planets orbiting broad-line, rapidly rotating stars.
Source: The Astronomical Journal
Authors: Jake T. Clark, Brett C. Addison, Jack Okumura, Sydney Vach, Adriana Errico, Alexis Heitzmann, Joseph E. Rodriguez, Duncan J. Wright, Mathieu Clerté, Carolyn J. Brown, Tara Fetherolf, Robert A. Wittenmyer, Peter Plavchan, Stephen R. Kane, Jonathan Horner, John F. Kielkopf, Avi Shporer, C. G. Tinney, Liu Hui-Gen, Sarah Ballard, Brendan P. Bowler, Matthew W. Mengel, George Zhou, Annette S. Lee, Avelyn David, Jessica Heim, Michele E. Lee, Verónica Sevilla, Naqsh E. Zafar, Natalie R. Hinkel, Bridgette E. Allen, Daniel Bayliss, Arthur Berberyan, Perry Berlind, Allyson Bieryla, François Bouchy, Rafael Brahm, Edward M. Bryant, Jessie L. Christiansen, David R. Ciardi, Krys N. Ciardi, Karen A. Collins, Jules Dallant, Allen B. Davis, Matías R. Díaz, Courtney D. Dressing, Gilbert A. Esquerdo, Jan-Vincent Harre, Steve B. Howell, Jon M. Jenkins, Eric L. N. Jensen, Matías I. Jones, Andrés Jordán, David W. Latham, Michael B. Lund, James McCormac, Louise D. Nielsen, Jon Otegi, Samuel N. Quinn, Don J. Radford, George R. Ricker, Richard P. Schwarz, Sara Seager, Alexis M. S. Smith, Chris Stockdale, Thiam-Guan Tan, Stéphane Udry, Roland Vanderspek, Maximilian N. Günther, Songhu Wang, Geof Wingham, Joshua N. Winn
Institutions: University of Southern Queensland, Swinburne University of Technology, Center for Astrophysics Harvard & Smithsonian, Queen Mary University of London, Michigan State University, University of California, Riverside, George Mason University, University of Louisville, Massachusetts Institute of Technology, UNSW Sydney, Nanjing University, University of Florida, The University of Texas at Austin, University of California, Santa Cruz, University of Lancashire, Southwest Research Institute, California Institute of Technology, University of Wisconsin–Stout, NASA Exoplanet Science Institute, University of Warwick, College of the Canyons, University of Geneva, Adolfo Ibáñez University, Millennium Institute of Astrophysics, Data Observatory Foundation, Rhode Island College, Yale University, Carnegie Institution for Science, Carnegie Observatories, Las Campanas Observatory, University of Chile, University of California, Berkeley, Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR), Ames Research Center, Swarthmore College, European Southern Observatory, Curtin University, Perth Exoplanet Survey Telescope Observatory, European Space Agency, European Space Research and Technology Centre, Indiana University Bloomington, Indiana University, Princeton University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Funders: National Science Foundation, National Aeronautics and Space Administration, Australian Government, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Korea Astronomy and Space Science Institute, Ministério da Ciência, Tecnologia, Inovações e Comunicações, Agencia Nacional de Investigación y Desarrollo, Science and Technology Facilities Council, Australian Research Council
Awards: The Next Generation Transit Survey (NGTS): Operations 2019-2022, The Next Generation Transit Survey (NGTS): Operations 2022-2025, Catch me if you can: The race to rescue the smallest planets, The Next Generation Transit Survey (NGTS): Deployment and Operations, Warwick Astronomy & Astrophysics Consolidated Grant 2023-2026, Warwick Astronomy and Astrophysics Consolidated Grant 2017-2020
OpenAlex ID: W4366390785