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A list of all the posts and pages found on the site. For you robots out there, there is an XML version available for digesting as well.
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Posts
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portfolio
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publications
The PFS View of TOI-677 b: A Spin–Orbit Aligned Warm Jupiter in a Dynamically Hot System
Published in The Astronomical Journal, 2024
In this work, we present a new Rossiter–McLaughlin measurement of the tidally detached warm Jupiter TOI-677 b, obtained using high-precision radial velocity observations with Magellan’s Planet Finder Spectrograph (PFS). Combined with previously published observations from the Very Large Telescope’s ESPRESSO spectrograph, we derive one of the most precisely constrained sky-projected spin–orbit angle measurements to date for an exoplanet. The combined fit offers a refined set of self-consistent parameters, including a low sky-projected stellar obliquity of \(\lambda ={3\buildrel{\circ}\over{.} 2}_{-{1.}^{\circ }5}^{+{1.}^{\circ }6}\) and a moderately high eccentricity of \(e={0.460}_{-0.018}^{+0.019}\), which further constrain the puzzling architecture of this system. This system adds to a growing population of aligned warm Jupiters on eccentric orbits around hot (\(T_{\rm eff} > 6100\) K) stars.
Early Stellar Flybys are Unlikely: Improved Constraints from Sednoids and Large-q Trans-Neptunian Objects
Published in The Astrophysical Journal, 2025
Sedna-like objects (a.k.a. sednoids) are trans-Neptunian objects (TNOs) characterized by large semimajor axes and exceptionally high perihelia. Their high-q orbits are detached from the influence of the four giant planets and need extra perturbation to form. One hypothesis posits that close stellar flybys could have perturbed objects from the primordial scattering disk, generating the sednoid population. In this study, we run N-body simulations with different stellar encounter configurations to explore whether such a close stellar flyby can satisfy new constraints identified from sednoid (and detached extreme TNO) observation, including the low-inclination (\(i < 30^{\circ}\)) profile and primordial orbital alignment. Our results suggest that flybys with field stars are unable to generate a sufficient population, whereas flybys within the birth cluster fail to produce the primordial orbital alignment. To meet the inclination constraint of detached extreme TNOs, flybys have to be either coplanar (\(i_{\star}\sim 0^{\circ}\)) or symmetric about the ecliptic plane (\(ω_\star \sim 0^{\circ}, i_\star\sim 90^{\circ}\)). After taking into account their occurrence rate at the early stage of the solar system, we conclude that close-in stellar flybys (\(q_\star \leq 1000\)au) that satisfy all constraints are unlikely to happen (\(\leq5\%\)).
Exciting Stellar Eccentricity in Gaia BH3 via a Hidden Black Hole Binary
Published in The Astrophysical Journal Letters, 2025
We propose that the high eccentricity of the stellar orbit in the Gaia BH3 system could be excited through a secular resonance effect if the inner dark object is, in effect, a tight and eccentric black hole binary (BHB). During the orbital decay of the inner BHB, the apsidal precession rate of the inner binary matches that of the outer stellar orbit, and this resonance advection can drive the outer eccentricity into some extreme values. For a Gaia BH3-like system, we show that a near equal-mass (\(q = 0.8\)) BHB with an initial semimajor axis of \(1─3\) au and an initial eccentricity \(\gtrsim 0.95\) is able to excite the outer orbit to the observed value, leaving a current BHB with a semimajor axis \(0.25─0.5\) au and eccentricity \(\sim0.8\). The eccentric inner BHB imprints two observable signatures on the outer star: (1) short-term radial velocity (RV) modulations with an amplitude \(\lesssim 100\) m s−1 and (2) long-term apsidal precession with a rate \(\lesssim 0.^{\circ}1\) yr−1.
talks
Talk 1 on Relevant Topic in Your Field
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Conference Proceeding talk 3 on Relevant Topic in Your Field
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teaching
Teaching experience 1
Undergraduate course, University 1, Department, 2014
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Teaching experience 2
Workshop, University 1, Department, 2015
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