The Orbital Architecture of Qatar-6: A Fully Aligned 3-Body System?
| Autor: | Rice, Malena, Wang, Songhu, Gerbig, Konstantin, Wang, Xian-Yu, Dai, Fei, Tyler, Dakotah, Isaacson, Howard, Howard, Andrew W. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-3881/aca88e |
| Popis: | 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 $\lambda={0.1\pm2.6}^{\circ}$. Combining this new constraint with the stellar rotational velocity of Qatar-6 A that we measure from TESS photometry, we derive a true obliquity $\psi={21.82^{+8.86}_{-18.36}}^{\circ}$ -- 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 ($i_{B}={90.17^{+1.07}_{-1.06}}^{\circ}$), 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 3-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. Comment: 17 pages, 7 figures, accepted to AJ |
| Databáze: | arXiv |
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