TOI-3362b: A Proto Hot Jupiter Undergoing High-eccentricity Tidal Migration

Jiayin Dong, Chelsea X. Huang, George Zhou, Rebekah I. Dawson, Joseph E. Rodriguez, Jason D. Eastman, Karen A. Collins, Samuel N. Quinn, Avi Shporer, Amaury H.M.J. Triaud, Songhu Wang, Thomas Beatty, Jonathon M. Jackson, Kevin I. Collins, Lyu Abe, Olga Suarez, Nicolas Crouzet, Djamel Mékarnia, Georgina Dransfield, Eric L.N. JensenChris Stockdale, Khalid Barkaoui, Alexis Heitzmann, Duncan J. Wright, Brett C. Addison, Robert A. Wittenmyer, Jack Okumura, Brendan P. Bowler, Jonathan Horner, Stephen R. Kane, John Kielkopf, Huigen Liu, Peter Plavchan, Matthew W. Mengel, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, Jessie L. Christiansen, Martin Paegert

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


High-eccentricity tidal migration is a possible way for giant planets to be placed in short-period orbits. If this happens often, one would expect to catch proto hot Jupiters on highly elliptical orbits undergoing high-eccentricity tidal migration. As of yet, few such systems have been discovered. Here, we introduce TOI-3362b (TIC-464300749b), an 18.1 day, 5 MJup planet orbiting a main-sequence F-type star that is likely undergoing high-eccentricity tidal migration. The orbital eccentricity is 0.815-0.032+0.023. With a semimajor axis of 0.153-0.003+0.002 au, the planet's orbit is expected to shrink to a final orbital radius of 0.051-0.006+0.008 au after complete tidal circularization. Several mechanisms could explain the extreme value of the planet's eccentricity, such as planet-planet scattering and secular interactions. Such hypotheses can be tested with follow-up observations of the system, e.g., measuring the stellar obliquity and searching for companions in the system with precise, long-term radial-velocity observations. The variation in the planet's equilibrium temperature as it orbits the host star and the tidal heating at periapse make this planet an intriguing target for atmospheric modeling and observation. Because the planet's orbital period of 18.1 days is near the limit of TESS's period sensitivity, even a few such discoveries suggest that proto hot Jupiters may be quite common.

Original languageEnglish (US)
Article numberL16
JournalAstrophysical Journal Letters
Issue number1
StatePublished - Oct 10 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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