TESS Hunt for Young and Maturing Exoplanets (THYME). X. A Two-planet System in the 210 Myr MELANGE-5 Association
Article
Thao, Pa Chia, Mann, Andrew W., Barber, Madyson G., Kraus, Adam L., Tofflemire, Benjamin M., Bush, Jonathan L., Wood, Mackenna L., Collins, Karen A., Vanderburg, Andrew, Quinn, Samuel N., Zhou, George, Newton, Elisabeth R., Ziegler, Carl, Law, Nicholas, Barkaoui, Khalid, Pozuelos, Francisco J., Timmermans, Mathilde, Gillon, Michaël, Jehin, Emmanuël, ..., Kunimoto, Michelle. 2024. "TESS Hunt for Young and Maturing Exoplanets (THYME). X. A Two-planet System in the 210 Myr MELANGE-5 Association." The Astronomical Journal. 168 (1). https://doi.org/10.3847/1538-3881/ad4993
Article Title | TESS Hunt for Young and Maturing Exoplanets (THYME). X. A Two-planet System in the 210 Myr MELANGE-5 Association |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Thao, Pa Chia, Mann, Andrew W., Barber, Madyson G., Kraus, Adam L., Tofflemire, Benjamin M., Bush, Jonathan L., Wood, Mackenna L., Collins, Karen A., Vanderburg, Andrew, Quinn, Samuel N., Zhou, George, Newton, Elisabeth R., Ziegler, Carl, Law, Nicholas, Barkaoui, Khalid, Pozuelos, Francisco J., Timmermans, Mathilde, Gillon, Michaël, Jehin, Emmanuël, Schwarz, Richard P., Gan, Tianjun, Shporer, Avi, Horne, Keith, Sefako, Ramotholo, Suarez, Olga, Mekarnia, Djamel, Guillot, Tristan, Abe, Lyu, Triaud, Amaury H. M. J., Radford, Don J., Murillo, Ana Isabel Lopez, Ricker, George R., Winn, Joshua N., Jenkins, Jon M., Bouma, Luke G., Fausnaugh, Michael, Guerrero, Natalia M. and Kunimoto, Michelle |
Journal Title | The Astronomical Journal |
Journal Citation | 168 (1) |
Number of Pages | 24 |
Year | 2024 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ad4993 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad4993 |
Abstract | Young (<500 Myr) planets are critical to studying how planets form and evolve. Among these young planetary systems, multiplanet configurations are particularly useful, as they provide a means to control for variables within a system. Here, we report the discovery and characterization of a young planetary system, TOI-1224. We show that the planet host resides within a young population we denote as MELANGE-5. By employing a range of age-dating methods—isochrone fitting, lithium abundance analysis, gyrochronology, and Gaia excess variability—we estimate the age of MELANGE-5 to be 210 ± 27 Myr. MELANGE-5 is situated in close proximity to previously identified younger (80–110 Myr) associations, Crius 221 and Theia 424/Volans-Carina, motivating further work to map out the group boundaries. In addition to a planet candidate detected by the TESS pipeline and alerted as a TESS object of interest, TOI-1224 b, we identify a second planet, TOI-1224 c, using custom search tools optimized for young stars (Notch and LOCoR). We find that the planets are 2.10 ± 0.09 R⊕ and 2.88 ± 0.10 R⊕ and orbit their host star every 4.18 and 17.95 days, respectively. With their bright (K = 9.1 mag), small (R* = 0.44 R⊙), and cool (Teff = 3326 K) host star, these planets represent excellent candidates for atmospheric characterization with JWST. |
Keywords | Exoplanet astronomy ; Transit timing variation method; Stellar ages; Stellar activity; Young star clusters; Transit photometry |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510199. Astronomical sciences not elsewhere classified |
Byline Affiliations | University of North Carolina at Chapel Hill, United States |
University of Texas at Austin, United States | |
Massachusetts Institute of Technology, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Centre for Astrophysics | |
Dartmouth College, United States | |
Stephen F. Austin State University, United States | |
University of Liege, Belgium | |
Institute of Astrophysics of Andalusia, Spain | |
Tsinghua University, China | |
University of St Andrews, United Kingdom | |
South African Astronomical Observatory, South Africa | |
Côte d’Azur University, France | |
University of Birmingham, United Kingdom | |
Brierfield Observatory, Australia | |
Princeton University, United States | |
NASA Ames Research Center, United States | |
Texas Tech University, United States | |
University of Florida, United States |
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https://research.usq.edu.au/item/z85v3/tess-hunt-for-young-and-maturing-exoplanets-thyme-x-a-two-planet-system-in-the-210-myr-melange-5-association
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