A Ground-Based Transit Observation of the Long-Period Extremely Low-Density Planet HIP 41378 f

Kavli Affiliate: David Charbonneau | First 5 Authors: Juliana García-Mejía, Zoë L. de Beurs, Patrick Tamburo, Andrew Vanderburg, David Charbonneau | Summary: We present a ground-based transit detection of HIP 41378 f, a long-period ($P = 542$ days), extremely low-density ($0.09 pm 0.02$ g cm$^{-3}$) giant exoplanet in a dynamically complex system. Using photometry from […]


Continue.. A Ground-Based Transit Observation of the Long-Period Extremely Low-Density Planet HIP 41378 f

Metallicities from High-Resolution TRES Spectra with The Payne and uberMS: Performance Benchmarks and Literature Comparison

Kavli Affiliate: David Charbonneau | First 5 Authors: Emily K. Pass, Phillip A. Cargile, Victoria DiTomasso, Romy Rodríguez Martínez, David Charbonneau | Summary: As the field of exoplanetary astronomy has matured, there has been growing demand for precise stellar abundances to probe subtle correlations between stellar compositions and planetary demographics. However, drawing population-level conclusions from […]


Continue.. Metallicities from High-Resolution TRES Spectra with The Payne and uberMS: Performance Benchmarks and Literature Comparison

The True Stellar Obliquity of a Sub-Saturn Planet from the Tierras Observatory and KPF

Kavli Affiliate: David Charbonneau | First 5 Authors: Patrick Tamburo, Samuel W. Yee, Juliana García-Mejía, Gudmundur Stefánsson, David Charbonneau | Summary: We measure the true obliquity of TOI-2364, a K dwarf with a sub-Saturn-mass ($M_p = 0.18,M_J$) transiting planet on the upper edge of the hot Neptune desert. We used new Rossiter-McLaughlin observations gathered with […]


Continue.. The True Stellar Obliquity of a Sub-Saturn Planet from the Tierras Observatory and KPF

The dearth of high-mass hydrogen-atmosphere metal-polluted white dwarfs within 40 pc

Kavli Affiliate: David Charbonneau | First 5 Authors: Tim Cunningham, Pier-Emmanuel Tremblay, Mairi O’Brien, Evan B. Bauer, Mark A. Hollands | Summary: We present a population synthesis model which addresses the different mass distributions of the metal-polluted and non-metal-polluted hydrogen-atmosphere white dwarfs identified in volume-limited samples. Specifically, metal-pollution has been observed to be rare in […]


Continue.. The dearth of high-mass hydrogen-atmosphere metal-polluted white dwarfs within 40 pc

TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf

Kavli Affiliate: David Charbonneau | First 5 Authors: Rena A. Lee, Fei Dai, Andrew W. Howard, Samuel Halverson, Jonathan Gomez Barrientos | Summary: We report the confirmation of TOI-6324 b, an Earth-sized (1.059 $pm$ 0.041 R$_oplus$) ultra-short-period (USP) planet orbiting a nearby ($sim$20 pc) M dwarf. Using the newly commissioned Keck Planet Finder (KPF) spectrograph, […]


Continue.. TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf

TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf

Kavli Affiliate: David Charbonneau | First 5 Authors: Rena A. Lee, Fei Dai, Andrew W. Howard, Samuel Halverson, Jonathan Gomez Barrientos | Summary: We report the confirmation of TOI-6324 b, an Earth-sized (1.059 $pm$ 0.041 R$_oplus$) ultra-short-period (USP) planet orbiting a nearby ($sim$20 pc) M dwarf. Using the newly commissioned Keck Planet Finder (KPF) spectrograph, […]


Continue.. TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf

Expansion properties of the young supernova type Iax remnant Pa 30 revealed

Kavli Affiliate: David Charbonneau | First 5 Authors: Tim Cunningham, Ilaria Caiazzo, Nikolaus Z. Prusinski, James Fuller, John C. Raymond | Summary: The recently discovered Pa 30 nebula, the putative type Iax supernova remnant associated with the historical supernova of 1181 AD, shows puzzling characteristics that make it unique among known supernova remnants. In particular, […]


Continue.. Expansion properties of the young supernova type Iax remnant Pa 30 revealed

Off-axis Hartmann wavefront sensing for the GMT-Consortium Large Earth Finder (G-CLEF) red camera optics

Kavli Affiliate: David Charbonneau | First 5 Authors: Matthew C. H. Leung, Colby A. Jurgenson, Andrew Szentgyorgyi, Brian McLeod, Cem Onyuksel | Summary: The Hartmann test is a method used to measure the wavefront error in a focal optical system, wherein a mask with a pattern of small holes is placed at the system’s aperture […]


Continue.. Off-axis Hartmann wavefront sensing for the GMT-Consortium Large Earth Finder (G-CLEF) red camera optics

Exploring the directly imaged HD 1160 system through spectroscopic characterisation and high-cadence variability monitoring

Kavli Affiliate: David Charbonneau | First 5 Authors: Ben J. Sutlieff, Jayne L. Birkby, Jordan M. Stone, Annelotte Derkink, Frank Backs | Summary: The time variability and spectra of directly imaged companions provide insight into their physical properties and atmospheric dynamics. We present follow-up R~40 spectrophotometric monitoring of red companion HD 1160 B at 2.8-4.2 […]


Continue.. Exploring the directly imaged HD 1160 system through spectroscopic characterisation and high-cadence variability monitoring