TOI-2005b: An Eccentric Warm Jupiter in Spin-Orbit Alignment

Allyson Bieryla; Jiayin Dong; George Zhou; Jason D. Eastman; L. C. Mayorga; David W. Latham; Brad Carter; Chelsea X. Huang; Samuel N. Quinn; Karen A. Collins; Lyu Abe; Yuri Beletsky; Rafael Brahm; Nicole D. Colón; Zahra Ensak; Tristan Guillot; Thomas Henning; Melissa J. Hobson; Keith Horne; Jon M. Jenkins; Matías I. Jones; Andrés Jordán; David Osip; George R. Ricker; Joseph E. Rodriguez; Jack Schulte; Richard P. Schwarz; Sara Seager; Avi Shporer; Olga Suarez; Thiam-Guan Tan; Eric B. Ting; Amaury Triaud; Andrew Vanderburg; Jesus Noel Villanseñor; Noah Vowell; Christilyn N. Watkins; Joshua N. Winn; Carl Ziegler

doi:10.3847/1538-3881/adc441

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arXiv · 2503.20069

TOI-2005b: An Eccentric Warm Jupiter in Spin-Orbit Alignment

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Abstract

We report the discovery and characterization of TOI-2005b, a warm Jupiter on an eccentric (e~0.59), 17.3-day orbit around a V_mag = 9.867 rapidly rotating F-star. The object was detected as a candidate by TESS and the planetary nature of TOI-2005b was then confirmed via a series of ground-based photometric, spectroscopic, and diffraction-limited imaging observations. The planet was found to reside in a low sky-projected stellar obliquity orbit (lambda = 4.8 degrees) via a transit spectroscopic observation using the Magellan MIKE spectrograph.TOI-2005b is one of a few planets known to have a low-obliquity, high-eccentricity orbit, which may be the result of high-eccentricity coplanar migration. The planet has a periastron equilibrium temperature of ~ 2100 K, similar to some highly irradiated hot Jupiters where atomic metal species have been detected in transmission spectroscopy, and varies by almost 1000 K during its orbit. Future observations of the atmosphere of TOI-2005b can inform us about its radiative timescales thanks to the rapid heating and cooling of the planet.

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Allyson Bieryla, Jiayin Dong, George Zhou, Jason D. Eastman, L. C. Mayorga, David W. Latham, Brad Carter, Chelsea X. Huang, Samuel N. Quinn, Karen A. Collins, Lyu Abe, Yuri Beletsky, Rafael Brahm, Nicole D. Colón, Zahra Ensak, Tristan Guillot, Thomas Henning, Melissa J. Hobson, Keith Horne, Jon M. Jenkins, Matías I. Jones, Andrés Jordán, David Osip, George R. Ricker, Joseph E. Rodriguez, Jack Schulte, Richard P. Schwarz, Sara Seager, Avi Shporer, Olga Suarez, Thiam-Guan Tan, Eric B. Ting, Amaury Triaud, Andrew Vanderburg, Jesus Noel Villanseñor, Noah Vowell, Christilyn N. Watkins, Joshua N. Winn, Carl Ziegler. 2025-03-25. TOI-2005b: An Eccentric Warm Jupiter in Spin-Orbit Alignment. https://doi.org/10.3847/1538-3881%2Fadc441

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