Search Results - Samuel Halverson
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The Epoch of Giant Planet Migration Planet Search Program. III. The Occurrence Rate of Young Giant Planets inside the Water Ice Line
Published 2025-01-01Get full textWe present statistical results from the Epoch of Giant Planet Migration RV planet search program. This survey was designed to measure the occurrence rate of giant planets interior to the water ice line of young Sun-like stars, compare this to the prevalence of giant planets at older ages, and provid...
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Stellar Obliquity of the Ultra-short-period Planet System HD 93963
Published 2025-01-01Get full textWe report an observation of the Rossiter–McLaughlin (RM) effect of the transiting planet HD 93963 Ac, a mini-Neptune planet orbiting a G0-type star with an orbital period of P _c = 3.65 days, accompanied by an inner super-Earth planet with P _b = 1.04 days. We observed a full transit of planet c o...
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Time-resolved p-mode Oscillations for Subgiant HD 142091 with NEID at WIYN
Published 2025-01-01Get full textDetections of Earth-analog planets in radial velocity (RV) observations are limited by stellar astrophysical variability occurring on a variety of timescales. Current state-of-the-art methods to disentangle potential planet signals from intrinsic stellar signals assume that stellar signals introduce...
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The NEID Earth Twin Survey. II. Dynamical Masses in Seven High-acceleration Star Systems
Published 2025-01-01Get full textWe present a set of companion dynamical masses and orbital parameters of seven star systems from the NEID Earth Twin Survey with significant absolute astrometric accelerations between the epochs of Hipparcos and Gaia. These include four binary star systems (HD 68017 AB, 61 Cygni AB, HD 24496 AB, and...
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Searching for GEMS: Confirmation of TOI-5573 b, a Cool, Saturn-like Planet Orbiting an M Dwarf
Published 2025-01-01Get full textWe present the confirmation of TOI-5573 b, a Saturn-sized exoplanet on an 8.79 days orbit around an early M dwarf (3790 K, 0.59 R _⊙ , 0.61 M _⊙ , 12.30 Jmag). TOI-5573 b has a mass of $11{2}_{-19}^{+18}$ M _⊕ (0.35 ± 0.06 M _Jup ) and a radius of 9.75 ± 0.47 R _⊕ (0.87 ± 0.04 R _Jup ), resulting in...
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The Compositions of Rocky Planets in Close-in Orbits Tend to Be Earth-like
Published 2025-01-01Get full textHundreds of exoplanets between 1 and 1.8 times the size of Earth have been discovered on close-in orbits. However, these planets show such a diversity in densities that some appear to be made entirely of iron, while others appear to host gaseous envelopes. To test this diversity in composition, we u...
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