29 citations · 117 across the 14 of their papers we have counts for
14 papers
POSEIDON III: The Aligned Orbit of the Hot Neptune Around the Hot Star WASP-195
Juan I. Espinoza-Retamal, Joshua N. Winn, Rafael Brahm +33
Stellar obliquities provide important clues as to the formation and migration histories of planetary systems, but measurements remain scarce for Neptune-mass planets, especially th…
POSEIDON II: The Anti-Aligned Orbit of the Warm Neptune TOI-1710 A b
Juan I. Espinoza-Retamal, Hareesh Bhaskar, Joshua N. Winn +7
We present an observation of the Rossiter-McLaughlin effect for the TOI-1710 system with the NEID spectrograph on the WIYN 3.5 m telescope. The system hosts a warm Neptune ($P\sim2…
POSEIDON I: The Dynamical Origins of Transiting Neptunes
Juan I. Espinoza-Retamal, Joshua N. Winn, Rafael Brahm +17
We present the first results from the POSEIDON survey, aimed at constraining the dynamical origins of transiting Neptunes through stellar obliquity measurements. We report Rossiter…
A Cold and Super-Puffy Planet on a Prograde Orbit
Juan I. Espinoza-Retamal, Rafael Brahm, Cristobal Petrovich +36
We report the discovery of TOI-4507 b, a transiting sub-Saturn with a density 0.2 g/cm on a 105-day prograde orbit around a 700 Myr old F star. The transits were detected u…
TOI-1259Ab: A Warm Jupiter Orbiting a K-dwarf White-Dwarf Binary is on a Well-aligned Orbit
Hugo Veldhuis, Juan I. Espinoza-Retamal, Gudmundur Stefansson +21
The evolution of one member of a stellar binary into a white dwarf has been proposed as a mechanism that triggers the formation of close-in gas giant planets. The star's asymmetric…
Breaking long-period resonance chains with stellar flybys
C. Charalambous, N. Cuello, C. Petrovich
Context. Planetary migration models predict multiple planets captured into a chain of mean-motion resonances during the disk phase. Over a dozen systems have been observed in these…
The Effect of Massive Trans-Neptunian Objects in the Long-term Evolution and Leaking Rates of Neptune's 3:2 and 2:1 Mean Motion Resonances
Marco A. Muñoz-Gutiérrez, Sebastián Ramírez, Antonio Peimbert +2
The current populations trapped in Neptune's main mean motion resonances in the Kuiper belt, Plutinos in the 3:2 and Twotinos in the 2:1, contain some of the best-characterized min…
The Spin-Orbit Alignment of 8 Warm Gas Giant Systems
Juan I. Espinoza-Retamal, Andrés Jordán, Rafael Brahm +9
Essential information about the formation and evolution of planetary systems can be found in their architectures -- in particular, in stellar obliquity () -- as they serve as a…
Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b
Ryan A. Rubenzahl, Andrew W. Howard, Samuel Halverson +25
The orbits of close-in exoplanets provide clues to their formation and evolutionary history. Many close-in exoplanets likely formed far out in their protoplanetary disks and migrat…
HATS-38 b and WASP-139 b join a growing group of hot Neptunes on polar orbits
Juan I. Espinoza-Retamal, Guðmundur Stefánsson, Cristobal Petrovich +9
We constrain the sky-projected obliquities of two low-density hot Neptune planets, HATS-38 b and WASP-139 b, orbiting nearby G and K stars using Rossiter-McLaughlin (RM) observatio…
Evidence for Primordial Alignment: Insights from Stellar Obliquity Measurements for Compact Sub-Saturn Systems
Brandon T. Radzom, Jiayin Dong, Malena Rice +5
Despite decades of effort, the mechanisms by which the spin axis of a star and the orbital axes of its planets become misaligned remain elusive. Particularly, it is of great intere…
Binary mergers in the centers of galaxies: synergy between stellar flybys and tidal fields
Mila Winter-Granic, Cristobal Petrovich, Valentín Peña-Donaire +1
Galactic centers are very dynamically active environments, often harbouring a nuclear star cluster and supermassive black hole at their cores. Binaries in these environments are su…
Prospects from TESS and Gaia to constrain the flatness of planetary systems
Juan I. Espinoza-Retamal, Wei Zhu, Cristobal Petrovich
The mutual inclination between planets orbiting the same star provides key information to understand the formation and evolution of multi-planet systems. In this work, we investiga…
The Aligned Orbit of the Eccentric Proto Hot Jupiter TOI-3362b
Juan I. Espinoza-Retamal, Rafael Brahm, Cristobal Petrovich +8
High-eccentricity tidal migration predicts the existence of highly eccentric proto-hot Jupiters on the "tidal circularization track," meaning that they might eventually become hot…