An Aligned Orbit for the Young Planet V1298 Tau b
Article
Article Title | An Aligned Orbit for the Young Planet V1298 Tau b |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Johnson, Marshall C. (Author), David, Trevor J. (Author), Petigura, Erik A. (Author), Isaacson, Howard T. (Author), Van Zandt, Judah (Author), Ilyin, Ilya (Author), Strassmeier, Klaus (Author), Mallonn, Matthias (Author), Zhou, George (Author), Mann, Andrew W. (Author), Livingston, John H. (Author), Luger, Rodrigo (Author), Dai, Fei (Author), Weiss, Lauren M. (Author), Mocnik, Teo (Author), Giacalone, Steven (Author), Hill, Michelle L. (Author), Rice, Malena (Author), Blunt, Sarah (Author), Rubenzahl, Ryan (Author), Dalba, Paul A. (Author), Esquerdo, Gilbert A. (Author), Berlind, Perry (Author), Calkins, Michael L. (Author) and Foreman-Mackey, Daniel (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 163 (6), pp. 1-15 |
Article Number | 247 |
Number of Pages | 15 |
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/ac6271 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ac6271 |
Abstract | The alignment of planetary orbits with respect to the stellar rotation preserves information on their dynamical histories. Measuring this angle for young planets helps illuminate the mechanisms that create misaligned orbits for older planets, as different processes could operate over timescales ranging from a few megayears to a gigayear. We present spectroscopic transit observations of the young exoplanet V1298 Tau b; we update the age of V1298 Tau to be 28 ± 4 Myr based on Gaia EDR3 measurements. We observed a partial transit with Keck/HIRES and LBT/PEPSI, and detected the radial velocity anomaly due to the Rossiter-McLaughlin effect. V1298 Tau b has a prograde, well-aligned orbit, with λ=4-10+7 deg. By combining the spectroscopically measured v sin i∗ and the photometrically measured rotation period of the host star we also find that the orbit is aligned in 3D, ψ=8-7+4 deg. Finally, we combine our obliquity constraints with a previous measurement for the interior planet V1298 Tau c to constrain the mutual inclination between the two planets to be i mut = 0° ± 19°. This measurements adds to the growing number of well-aligned planets at young ages, hinting that misalignments may be generated over timescales of longer than tens of megayears. The number of measurements, however, is still small, and this population may not be representative of the older planets that have been observed to date. We also present the derivation of the relationship between i mut, λ, and i for the two planets. |
Keywords | Exoplanets; Exoplanet dynamics; High resolution spectroscopy; Starspots; Pre-main sequence; 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 | Las Cumbres Observatory, United States |
Flatiron Institute, United States | |
University of California, United States | |
Leibniz Institute for Astrophysics, Germany | |
Centre for Astrophysics | |
University of North Carolina, United States | |
University of Tokyo, Japan | |
California Institute of Technology (Caltech), United States | |
University of Notre Dame, United States | |
Gemini Observatory, United States | |
Yale University, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Funding source | Australian Research Council (ARC) Grant ID DE210101893 |
https://research.usq.edu.au/item/q7qvw/an-aligned-orbit-for-the-young-planet-v1298-tau-b
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