NEID Rossiter–McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star
Article
Article Title | NEID Rossiter–McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star |
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ERA Journal ID | 45091 |
Article Category | Article |
Authors | Dong, Jiayin (Author), Huang, Chelsea X. (Author), Zhou, George (Author), Dawson, Rebekah I. (Author), Stefansson, Gumundur K. (Author), Bender, Chad F. (Author), Blake, Cullen H. (Author), Ford, Eric B. (Author), Halverson, Samuel (Author), Kanodia, Shubham (Author), Mahadevan, Suvrath (Author), McElwain, Michael W. (Author), Ninan, Joe P. (Author), Robertson, Paul (Author), Roy, Arpita (Author), Schwab, Christian (Author), Stevens, Daniel J. (Author), Terrien, Ryan C. (Author), Vanderburg, Andrew (Author), Kraus, Adam L. (Author), Douglas, Stephanie (Author), Newton, Elisabeth (Author), Rampalli, Rayna (Author), Krolikowski, Daniel M. (Author), Collins, Karen A. (Author), Rodriguez, Joseph E. (Author), Feliz, Dax L. (Author), Srdoc, Gregor (Author), Ziegler, Carl (Author), Barkaoui, Khalid (Author), Pozuelos, Francisco J. (Author), Jehin, Emmanuel (Author), Michael, C. (Author), Benkhaldoun, Zouhair (Author), Lewin, Pablo (Author), Fores-Toribio, Raquel (Author), Munoz, Jose A. (Author), McLeod, Kim K. (Author), Ozyurt, Fiona Powers (Author), Horta, Ferran Grau (Author), Murgas, Felipe (Author), Latham, David W. (Author), Quinn, Samuel N. (Author), Bieryla, Allyson (Author), Howell, Steve B. (Author), Gnilka, Crystal L. (Author), Ciardi, David R. (Author), Lund, Michael B. (Author), Dressing, Courtney D. (Author), Giacalone, Steven (Author), Savel, Arjun B. (Author), Strakhov, Ivan A. (Author), Belinski, Alexander A. (Author), Ricker, George R. (Author), Seager, S. (Author), Winn, Joshua N. (Author), Jenkins, Jon M. (Author), Torres, Guillermo (Author) and Paegert, Martin (Author) |
Journal Title | The Astrophysical Journal Letters |
Journal Citation | 926 (2), pp. 1-12 |
Article Number | L7 |
Number of Pages | 12 |
Year | 2022 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 2041-8205 |
2041-8213 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/2041-8213/ac4da0 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/2041-8213/ac4da0 |
Abstract | Close-in gas giants present a surprising range of stellar obliquity, the angle between a planet's orbital axis and its host star's spin axis. It is unclear whether the obliquities reflect the planets' dynamical history (e.g., aligned for in situ formation or disk migration versus misaligned for high-eccentricity tidal migration) or whether other mechanisms (e.g., primordial misalignment or planet-star interactions) are more important in sculpting the obliquity distribution. Here we present the stellar obliquity measurement of TOI-1268 (TIC-142394656, V mag ∼10.9), a young K-type dwarf hosting an 8.2 day period, Saturn-sized planet. TOI-1268's lithium abundance and rotation period suggest the system age between the ages of the Pleiades cluster (∼120 Myr) and the Prasepe cluster (∼670 Myr). Using the newly commissioned NEID spectrograph, we constrain the stellar obliquity of TOI-1268 via the Rossiter-McLaughlin effect from both radial velocity and Doppler tomography signals. The 3σ upper bounds of the projected stellar obliquity λ from both models are below 60°. The large host star separation (a/R ∗ ∼17), combined with the system's young age, makes it unlikely that the planet has realigned its host star. The stellar obliquity measurement of TOI-1268 probes the architecture of a young gas giant beyond the reach of tidal realignment (a/R ∗ ≲10) and reveals an aligned or slightly misaligned system. |
Keywords | Extrasolar gaseous giant planets (509); Radial velocity (1332); Transit photometry (1709); Stellar activity (1580); Exoplanet dynamics (490); 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 | Pennsylvania State University, United States |
Centre for Astrophysics | |
Princeton University, United States | |
University of Arizona, United States | |
University of Pennsylvania, United States | |
Massachusetts Institute of Technology, United States | |
National Aeronautics and Space Administration (NASA), United States | |
University of California, United States | |
Space Telescope Science Institute, United States | |
Macquarie University | |
Carleton College, United States | |
University of Texas at Austin, United States | |
Lafayette College, United States | |
Dartmouth College, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Michigan State University, United States | |
Vanderbilt University, United States | |
Kotizarovci Observatory, Croatia | |
Stephen F. Austin State University, United States | |
University of Liege, Belgium | |
Cadi Ayyad University, Morocco | |
Maury Lewin Astronomical Observatory, United States | |
University of Valencia, Spain | |
Wellesley College, United States | |
Observatory of Ca l'Ou, Spain | |
Institute of Astrophysics of the Canary Islands, Spain | |
University of Maryland, United States | |
Moscow State University, Russia | |
NASA Ames Research Center, United States |
https://research.usq.edu.au/item/q7260/neid-rossiter-mclaughlin-measurement-of-toi-1268b-a-young-warm-saturn-aligned-with-its-cool-host-star
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