NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star

Dong, Jiayin; Huang, Chelsea X.; Zhou, George; Dawson, Rebekah I.; Stefánsson, Gumundur K.; Bender, Chad F.; Blake, Cullen H.; Ford, Eric B.; Halverson, Samuel; Kanodia, Shubham; Mahadevan, Suvrath; McElwain, Michael W.; Ninan, Joe P.; Robertson, Paul; Roy, Arpita; Schwab, Christian; Stevens, Daniel J.; Terrien, Ryan C.; Vanderburg, Andrew; Kraus, Adam L.; Douglas, Stephanie; Newton, Elisabeth; Rampalli, Rayna; Krolikowski, Daniel M.; Collins, Karen A.; Rodriguez, Joseph E.; Feliz, Dax L.; Srdoc, Gregor; Ziegler, Carl; Barkaoui, Khalid; Pozuelos, Francisco J.; Jehin, Emmanuel; Michaël, C.; Benkhaldoun, Zouhair; Lewin, Pablo; Forés-Toribio, Raquel; Muñoz, Jose A.; McLeod, Kim K.; Özyurt, Fiona Powers; Horta, Ferran Grau; Murgas, Felipe; Latham, David W.; Quinn, Samuel N.; Bieryla, Allyson; Howell, Steve B.; Gnilka, Crystal L.; Ciardi, David R.; Lund, Michael B.; Dressing, Courtney D.; Giacalone, Steven; Savel, Arjun B.; Strakhov, Ivan A.; Belinski, Alexander A.; Ricker, George R.; Seager, S.; Winn, Joshua N.; Jenkins, Jon M.; Torres, Guillermo; Paegert, Martin
Referencia bibliográfica

The Astrophysical Journal

Fecha de publicación:
2
2022
Número de autores
59
Número de autores del IAC
1
Número de citas
13
Número de citas referidas
13
Descripción
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.
Proyectos relacionados
Image withthe projects' name
Exoplanetas y Astrobiología
La búsqueda de vida en el Universo se ha visto impulsada por los recientes descubrimientos de planetas alrededor de otras estrellas (los llamados exoplanetas), convirtiéndose en uno de los campos más activos dentro de la Astrofísica moderna. En los últimos años los descubrimientos cada vez más numerosos de nuevos exoplanetas y los últimos avances
Enric
Pallé Bago