The Orbital Architecture of Qatar-6: A Fully Aligned Three-body System?
Article
Rice, Malena, Wang, Songhu, Gerbig, Konstantin, Wang, Xian-Yu, Dai, Fei, Tyler, Dakotah, Isaacson, Howard and Howard, Andrew W.. 2023. "The Orbital Architecture of Qatar-6: A Fully Aligned Three-body System?" The Astronomical Journal. 165 (2). https://doi.org/10.3847/1538-3881/aca88e
Article Title | The Orbital Architecture of Qatar-6: A Fully Aligned Three-body System? |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Rice, Malena, Wang, Songhu, Gerbig, Konstantin, Wang, Xian-Yu, Dai, Fei, Tyler, Dakotah, Isaacson, Howard and Howard, Andrew W. |
Journal Title | The Astronomical Journal |
Journal Citation | 165 (2) |
Article Number | 65 |
Number of Pages | 13 |
Year | 2023 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aca88e |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aca88e/meta |
Abstract | The evolutionary history of an extrasolar system is, in part, fossilized through its planets’ orbital orientations relative to the host star’s spin axis. However, spin-orbit constraints for warm Jupiters—particularly in binary star systems, which are amenable to a wide range of dynamical processes—are relatively scarce. We report a measurement of the Rossiter-McLaughlin effect, observed with the Keck/HIRES spectrograph, across the transit of Qatar-6 A b—a warm Jupiter orbiting one star within a binary system. From this measurement, we obtain a sky-projected spin-orbit angle ? = 0.°1 ± 2.°6. Combining this new constraint with the stellar rotational velocity of Qatar-6 A that we measure from TESS photometry, we derive a true obliquity ? = 21.82 ? 18.36 + 8.86 ° —consistent with near-exact alignment. We also leverage astrometric data from Gaia DR3 to show that the Qatar-6 binary star system is edge-on ( i B = 90.17 ? 1.06 + 1.07 ° ), such that the stellar binary and the transiting exoplanet orbit exhibit line-of-sight orbit-orbit alignment. Ultimately, we demonstrate that all current constraints for the three-body Qatar-6 system are consistent with both spin-orbit and orbit-orbit alignment. High-precision measurements of the projected stellar spin rate of the host star and the sky-plane geometry of the transit relative to the binary plane are required to conclusively verify the full 3D configuration of the system. |
Keywords | Exoplanet tides; Exoplanet migration; Exoplanet evolution; Planetary alignment; Exoplanet dynamics; Star-planet interactions; Exoplanets ; Exoplanet astronomy; Planetary theory; Hot Jupiters |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | Yale University, United States |
Massachusetts Institute of Technology, United States | |
Indiana University, United States | |
Chinese Academy of Sciences, China | |
Division of Geological and Planetary Sciences, United States | |
California Institute of Technology (Caltech), United States | |
University of California Los Angeles, United States | |
University of California Berkeley, United States | |
Centre for Astrophysics |
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https://research.usq.edu.au/item/z26v1/the-orbital-architecture-of-qatar-6-a-fully-aligned-three-body-system
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