Tiger Lu
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View article: A High-precision, Differentiable Code for Solar System Ephemerides
A High-precision, Differentiable Code for Solar System Ephemerides Open
We present jorbit , a python/ JAX library designed to enable modern data-driven numerical studies of the solar system. Written entirely in JAX , an autodifferentiable and optionally GPU accelerated language behind many current large-scale …
View article: JWST Coronagraphic Images of 14 Her c: A Cold Giant Planet in a Dynamically Hot Multiplanet System
JWST Coronagraphic Images of 14 Her c: A Cold Giant Planet in a Dynamically Hot Multiplanet System Open
Most observed multiplanet systems are coplanar, in a dynamically “cold” configuration of concentric orbits like our own solar system. With the James Webb Space Telescope, we have detected 14 Her c, the first mature and cold exoplanet direc…
View article: JWST Coronagraphic Images of 14 Her c: a Cold Giant Planet in a Dynamically Hot, Multi-planet System
JWST Coronagraphic Images of 14 Her c: a Cold Giant Planet in a Dynamically Hot, Multi-planet System Open
Most observed multi-planet systems are coplanar, in a dynamically "cold" configuration of concentric orbits like our own Solar System. With the James Webb Space Telescope (JWST) we have detected 14 Her c, the first mature and cold exoplane…
View article: The Formation of Double Hot Jupiter Systems through von Zeipel–Lidov–Kozai Migration
The Formation of Double Hot Jupiter Systems through von Zeipel–Lidov–Kozai Migration Open
The von Zeipel–Lidov–Kozai (ZLK) mechanism with tidal friction has been demonstrated as a promising avenue to generate hot Jupiters in stellar binary systems. Previous population studies of hot Jupiter formation have largely examined this …
View article: Collisional Fragmentation Support in TRACE
Collisional Fragmentation Support in TRACE Open
We present improved collision support for TRACE , a state-of-the-art hybrid integrator in REBOUND . TRACE now supports collisional fragmentation and can handle both removing and adding particles mid-timestep. We describe the back-end logic…
View article: Collisional Fragmentation Support in TRACE
Collisional Fragmentation Support in TRACE Open
We present improved collision support for TRACE, a state-of-the-art hybrid integrator in REBOUND. TRACE now supports collisional fragmentation and can handle both removing and adding particles mid-timestep. We describe the back-end logic i…
View article: The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy Planet
The Dynamical History of HIP-41378 f—Oblique Exorings Masquerading as a Puffy Planet Open
The super-puff HIP-41378 f represents a fascinating puzzle due to its anomalously low density on a far-out orbit in contrast with other known super-puffs. In this work, we explore the hypothesis that HIP-41378 f is not in fact a low-densit…
View article: Planet–Planet Scattering and Von Zeipel–Lidov–Kozai Migration—The Dynamical History of HAT-P-11
Planet–Planet Scattering and Von Zeipel–Lidov–Kozai Migration—The Dynamical History of HAT-P-11 Open
The two planets of the HAT-P-11 system represent fascinating dynamical puzzles due to their significant eccentricities and orbital misalignments. In particular, HAT-P-11 b is in a close-in orbit in which tides should have circularized well…
View article: Significant Mutual Inclinations Between the Stellar Spin and the Orbits of Both Planets in the HAT-P-11 System
Significant Mutual Inclinations Between the Stellar Spin and the Orbits of Both Planets in the HAT-P-11 System Open
Planet–star obliquity and planet–planet mutual inclination encode a planetary system’s dynamical history, but both of their values are hard to measure for misaligned systems with close-in companions. HAT-P-11 is a K4 star with two known pl…
View article: The Dynamical History of HIP-41378 f -- Oblique Exorings Masquerading as a Puffy Planet
The Dynamical History of HIP-41378 f -- Oblique Exorings Masquerading as a Puffy Planet Open
The super-puff HIP-41378 f represents a fascinating puzzle due to its anomalously low density on a far-out orbit in contrast with other known super-puffs. In this work, we explore the hypothesis that HIP-41378 f is not in fact a low-densit…
View article: squishyplanet: modeling transits of non-sphericalexoplanets in JAX
squishyplanet: modeling transits of non-sphericalexoplanets in JAX Open
While astronomers often assume that exoplanets are perfect spheres when\nanalyzing observations, the subset of these distant worlds that are subject to\nstrong tidal forces and/or rapid rotations are expected to be distinctly\nellipsoidal …
View article: Significant mutual inclinations between the stellar spin and the orbits of both planets in the HAT-P-11 system
Significant mutual inclinations between the stellar spin and the orbits of both planets in the HAT-P-11 system Open
Planet-star obliquity and planet-planet ]mutual inclination encode a planetary system's dynamical history, but both of their values are hard to measure for misaligned systems with close-in companions. HAT-P-11 is a K4 star with two known p…
View article: Planet-Planet Scattering and ZLK Migration -- The Dynamical History of HAT-P-11
Planet-Planet Scattering and ZLK Migration -- The Dynamical History of HAT-P-11 Open
The two planets of the HAT-P-11 system represent fascinating dynamical puzzles due to their significant eccentricities and orbital misalignments. In particular, HAT-P-11 b is on a close-in orbit that tides should have circularized well wit…
View article: Emerging Researchers in Exoplanetary Science (ERES): Lessons Learned in Conference Organization for Early-Career Researchers
Emerging Researchers in Exoplanetary Science (ERES): Lessons Learned in Conference Organization for Early-Career Researchers Open
Since 2015, the Emerging Researchers in Exoplanetary Science (ERES) conference has provided a venue for early-career researchers in exoplanetary astronomy, astrophysics, and planetary science to share their research, network, and build new…
View article: Self-consistent Spin, Tidal, and Dynamical Equations of Motion in the REBOUNDx Framework
Self-consistent Spin, Tidal, and Dynamical Equations of Motion in the REBOUNDx Framework Open
We introduce self-consistent spin, tidal, and dynamical equations of motion into REBOUNDx , a library of additional effects for the popular N -body integrator REBOUND . The equations of motion used are derived from the constant time lag ap…
View article: Self-Consistent Spin, Tidal and Dynamical Equations of Motion in the REBOUNDx Framework
Self-Consistent Spin, Tidal and Dynamical Equations of Motion in the REBOUNDx Framework Open
We have introduced self-consistent spin, tidal and dynamical equations of motion into REBOUNDx, a library of additional effects for the popular N-body integrator REBOUND. The equations of motion used are derived from the constant time lag …
View article: Tilting Uranus via Spin–Orbit Resonance with Planet Nine
Tilting Uranus via Spin–Orbit Resonance with Planet Nine Open
Uranus’s startlingly large obliquity of 98° has yet to admit a satisfactory explanation. The most widely accepted hypothesis involving a giant impactor that tipped Uranus onto its side encounters several difficulties with regard to Uranus’…
View article: Tilting Uranus via Secular Spin-Orbit Resonance with Planet 9
Tilting Uranus via Secular Spin-Orbit Resonance with Planet 9 Open
Uranus' startlingly large obliquity of 98 degrees has yet to admit a satisfactory explanation. The most widely accepted hypothesis involving a giant impactor that tipped Uranus onto its side encounters several difficulties with regards to …
View article: Tidal Response and Shape of Hot Jupiters
Tidal Response and Shape of Hot Jupiters Open
We study the response of hot Jupiters to a static tidal perturbation using the concentric MacLaurin spheroid method. For strongly irradiated planets, we first performed radiative transfer calculations to relate the planet’s equilibrium tem…