The Occurrence of Small, Short-period Planets Younger than 200 Myr with TESS
Article
Article Title | The Occurrence of Small, Short-period Planets Younger than 200 Myr with TESS |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Vach, Sydney, Zhou, George, Huang, Chelsea X., Rogers, James G., Bouma, L. G., Douglas, Stephanie T., Kunimoto, Michelle, Mann, Andrew W., Barber, Madyson G., Quinn, Samuel N., Latham, David W., Bieryla, Allyson and Collins, Karen |
Journal Title | The Astronomical Journal |
Journal Citation | 167 (5) |
Article Number | 210 |
Number of Pages | 19 |
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/ad3108 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad3108 |
Abstract | Within the first few hundreds of millions of years, many physical processes sculpt the eventual properties of young planets. NASA’s Transiting Exoplanet Survey Satellite (TESS) mission has surveyed young stellar associations across the entire sky for transiting planets, providing glimpses into the various stages of planetary evolution. Using our own detection pipeline, we search a magnitude-limited sample of 7219 young stars (200 Myr) observed in the first 4 yr of TESS for small (2–8 R⊕), short period (1.6–20 days) transiting planets. The completeness of our survey is characterized by a series of injection and recovery simulations. Our analysis of TESS 2 minute cadence and Full Frame Image (FFI) light curves recover all known TESS Objects of Interest (TOIs), as well as four new planet candidates not previously identified as TOIs. We derive an occurrence rate of 35 %10 13 - + for mini-Neptunes and 27 %8 10 - + for super-Neptunes from the 2 minute cadence data, and 22 6.8 8.6 - + % for mini-Neptunes and 13 4.9 3.9 - + % for superNeptunes from the FFI data. To independently validate our results, we compare our survey yield with the predicted planet yield assuming Kepler planet statistics. We consistently find a mild increase in the occurrence of superNeptunes and a significant increase in the occurrence of Neptune-sized planets with orbital periods of 6.2–12 days when compared to their mature counterparts. The young planet distribution from our study is most consistent with evolution models describing the early contraction of hydrogen-dominated atmospheres undergoing atmospheric escape and inconsistent with heavier atmosphere models offering only mild radial contraction early on. |
Keywords | Exoplanets; Exoplanet astronomy; Planetary system evolution; Exoplanet evolution ; Transit photometry ; Mini Neptunes |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510199. Astronomical sciences not elsewhere classified |
Byline Affiliations | Centre for Astrophysics |
University of California Los Angeles, United States | |
California Institute of Technology (Caltech), United States | |
Lafayette College, United States | |
Massachusetts Institute of Technology, United States | |
University of North Carolina at Chapel Hill, United States | |
Center for Astrophysics Harvard and Smithsonian, United States |
https://research.usq.edu.au/item/z85vx/the-occurrence-of-small-short-period-planets-younger-than-200-myr-with-tess
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