TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana-Horologium Association
Article
Article Title | TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana-Horologium Association |
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ERA Journal ID | 45091 |
Article Category | Article |
Authors | Newton, Elisabeth R., Mann, Andrew W., Tofflemire, Benjamin M., Pearce, Logan, Rizzuto, Aaron C., Vanderburg, Andrew, Martinez, Raquel A., Wang, Jason J., Ruffio, Jean-Baptiste, Kraus, Adam L., Johnson, Marshall C., Thao, Pa Chia, Wood, Mackenna L., Rampalli, Rayna, Nielsen, Eric L., Collins, Karen A., Dragomir, Diana, Hellier, Coel, Anderson, D. R, Barclay, Thomas, Brown, Carolyn, Feiden, Gregory, Hart, Rhodes, Isopi, Giovanni, Kielkopf, John F., Mallia, Franco, Nelson, Peter, Rodriguez, Joseph E., Stockdale, Chris, Waite, Ian A., Wright, Duncan J., Lissauer, Jack J., Ricker, George R., Vanderspek, Roland, Latham, David W., Seager, Sara, Winn, Joshua N., Jenkins, Jon M., Bouma, Luke G., Burke, Christopher J., Davies, Misty, Fausnaugh, Michael, Li, Jie, Morris, Robert L., Mukai, Koji, Villaseñor, Joel, Villeneuva, Steven, De Rosa, Robert J., Macintosh, Bruce, Mengel, Matthew W., Okumura, Jack and Wittenmyer, Robert A. |
Journal Title | The Astrophysical Journal Letters |
Journal Citation | 880 (1), pp. 1-15 |
Article Number | L17 |
Number of Pages | 15 |
Year | 2019 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 2041-8205 |
2041-8213 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/2041-8213/ab2988 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/2041-8213/ab2988 |
Abstract | Young exoplanets are snapshots of the planetary evolution process. Planets that orbit stars in young associations are particularly important because the age of the planetary system is well constrained. We present the discovery of a transiting planet larger than Neptune but smaller than Saturn in the 45 Myr Tucana-Horologium young moving group. The host star is a visual binary, and our follow-up observations demonstrate that the planet orbits the G6V primary component, DS Tuc A (HD 222259A, TIC 410214986). We first identified transits using photometry from the Transiting Exoplanet Survey Satellite (TESS; alerted as TOI 200.01). We validated the planet and improved the stellar parameters using a suite of new and archival data, including spectra from Southern Astrophysical Research/Goodman, South African Extremely Large Telescope/High Resolution Spectrograph and Las Cumbres Observatories/Network of Robotic Echelle Spectrographs; transit photometry from Spitzer; and deep adaptive optics imaging from Gemini/Gemini Planet Imager. No additional stellar or planetary signals are seen in the data. We measured the planetary parameters by simultaneously modeling the photometry with a transit model and a Gaussian process to account for stellar variability. We determined that the planetary radius is 5.70 ± 0.17 R ⊕ and that the orbital period is 8.1 days. The inclination angles of the host star's spin axis, the planet's orbital axis, and the visual binary's orbital axis are aligned within 15° to within the uncertainties of the relevant data. DS Tuc Ab is bright enough (V = 8.5) for detailed characterization using radial velocities and transmission spectroscopy. |
Keywords | open clusters and associations: individual (Tucana-Horologium); planets and satellites: detection; planets and satellites: individual (HD 222259A); planets and satellites: individual (TIC 410214986); planets and satellites: individual (TOI 200.01) |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Funder | National Science Foundation |
Byline Affiliations | Dartmouth College, United States |
Massachusetts Institute of Technology, United States | |
University of North Carolina, United States | |
University of Texas at Austin, United States | |
California Institute of Technology (Caltech), United States | |
Stanford University, United States | |
Ohio State University, United States | |
Columbia University, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Keele University, United Kingdom | |
NASA Goddard Space Flight Center, United States | |
University of Maryland, United States | |
Centre for Astrophysics | |
University of North Georgia, United States | |
Campo Catino Astronomical Observatory, Italy | |
School of Mathematics, Physics and Computing | |
Ellinbank Observatory, Australia | |
Hazelwood Observatory, Australia | |
NASA Ames Research Center, United States | |
Princeton University, United States | |
SETI Institute, United States |
https://research.usq.edu.au/item/v4y11/tess-hunt-for-young-and-maturing-exoplanets-thyme-a-planet-in-the-45-myr-tucana-horologium-association
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