A Mini-Neptune from TESS and CHEOPS Around the 120Myr Old AB Dor Member HIP 94235
Article
Article Title | A Mini-Neptune from TESS and CHEOPS Around the 120Myr Old AB Dor Member HIP 94235 |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Zhou, George (Author), Wirth, Christopher P. (Author), Huang, Chelsea X. (Author), Venner, Alexander (Author), Franson, Kyle (Author), Quinn, Samuel N. (Author), Bouma, L. G. (Author), Kraus, Adam L. (Author), Mann, Andrew W. (Author), Newton, Elisabeth. R. (Author), Dragomir, Diana (Author), Heitzmann, Alexis (Author), Lowson, Nataliea (Author), Douglas, Stephanie T. (Author), Battley, Matthew (Author), Gillen, Edward (Author), Triaud, Amaury (Author), Latham, David W. (Author), Howell, Steve B. (Author), Hartman, J. D. (Author), Tofflemire, Benjamin M. (Author), Wittenmyer, Robert A. (Author), Bowler, Brendan P. (Author), Horner, Jonathan (Author), Kane, Stephen R. (Author), Kielkopf, John (Author), Plavchan, Peter (Author), Wright, Duncan J. (Author), Addison, Brett C. (Author), Mengel, Matthew W. (Author), Okumura, Jack (Author), Ricker, George (Author), Vanderspek, Roland (Author), Seager, Sara (Author), Jenkins, Jon M. (Author), Winn, Joshua N. (Author), Daylan, Tansu (Author), Fausnaugh, Michael (Author) and Kunimoto, Michelle (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 163 (6), pp. 1-19 |
Article Number | 289 |
Number of Pages | 19 |
Year | 2022 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ac69e3 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ac69e3 |
Abstract | The Transiting Exoplanet Survey Satellite (TESS) mission has enabled discoveries of the brightest transiting planet systems around young stars. These systems are the benchmarks for testing theories of planetary evolution. We report the discovery of a mini-Neptune transiting a bright star in the AB Doradus moving group. HIP 94235 (TOI-4399, TIC 464646604) is a V mag = 8.31 G-dwarf hosting a 3.00-0.28+0.32R⊠mini-Neptune in a 7.7 day period orbit. HIP 94235 is part of the AB Doradus moving group, one of the youngest and closest associations. Due to its youth, the host star exhibits significant photometric spot modulation, lithium absorption, and X-ray emission. Three 0.06% transits were observed during Sector 27 of the TESS Extended Mission, though these transit signals are dwarfed by the 2% peak-To-peak photometric variability exhibited by the host star. Follow-up observations with the Characterising Exoplanet Satellite confirmed the transit signal and prevented the erosion of the transit ephemeris. HIP 94235 is part of a 50 au G-M binary system. We make use of diffraction limited observations spanning 11 yr, and astrometric accelerations from Hipparcos and Gaia, to constrain the orbit of HIP 94235 B. HIP 94235 is one of the tightest stellar binaries to host an inner planet. As part of a growing sample of bright, young planet systems, HIP 94235 b is ideal for follow-up transit observations, such as those that investigate the evaporative processes driven by high-energy radiation that may sculpt the valleys and deserts in the Neptune population. |
Keywords | Exoplanet astronomy; Exoplanet evolution; Exoplanet detection; methods; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Centre for Astrophysics |
Harvard University, United States | |
University of Texas, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
California Institute of Technology (Caltech), United States | |
University of Texas at Austin, United States | |
University of North Carolina, United States | |
Dartmouth College, United States | |
University of New Mexico, United States | |
Lafayette College, United States | |
University of Warwick, United Kingdom | |
Queen Mary University of London, United Kingdom | |
University of Birmingham, United Kingdom | |
National Aeronautics and Space Administration (NASA), United States | |
Princeton University, United States | |
University of California, United States | |
School of Mathematics, Physics and Computing | |
George Mason University, United States | |
Massachusetts Institute of Technology, United States |
https://research.usq.edu.au/item/q77v7/a-mini-neptune-from-tess-and-cheops-around-the-120myr-old-ab-dor-member-hip-94235
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