Articles by Ben Sappey

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Ben Sappey

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Water dissociation and rotational broadening in the atmosphere of KELT-20 b from high-resolution spectroscopy

3 March 2025 by Luke Finnerty and others

Earth and Planetary Astrophysics

Technical description and performance of the phase II version of the Keck Planet Imager and Characterizer

3 February 2025 by Nemanja Jovanovic and others

Instrumentation and Methods for Astrophysics, Optics

HD 206893 B at High Spectral Resolution with the Keck Planet Imager and Characterizer (KPIC)

31 January 2025 by Ben Sappey and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

PDS 70b Shows Stellar-like Carbon-to-oxygen Ratio

21 December 2024 by Chih-Chun Hsu and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

True mass and atmospheric composition of the non-transiting hot Jupiter HD 143105 b

5 December 2024 by Luke Finnerty and others

Earth and Planetary Astrophysics

RV measurements of directly imaged brown dwarf GQ Lup B to search for exo-satellites

19 August 2024 by Katelyn Horstman and others at

Caltech

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

Fringing analysis and forward modeling of Keck Planet Imager and Characterizer (KPIC) spectra

19 August 2024 by Katelyn Horstman and others

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

Atmospheric characterization of the super-Jupiter HIP 99770 b with KPIC

30 July 2024 by Yapeng Zhang and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

The high-contrast performance of the Keck Planet Imager and Characterizer

21 June 2024 by Jason Wang and others

Instrumentation and Methods for Astrophysics, Earth and Planetary Astrophysics

Rotation and Abundances of the Benchmark Brown Dwarf HD 33632 Ab from Keck/KPIC High-resolution Spectroscopy

18 June 2024 by Chih-Chun Hsu and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

Are these planets or brown dwarfs? Broadly solar compositions from high-resolution atmospheric retrievals of ~10-30 M_\textrm{Jup} companions

21 May 2024 by Jerry Xuan and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

kappa And b is a fast rotator from KPIC High Resolution Spectroscopy

21 May 2024 by Evan Morris and others

Earth and Planetary Astrophysics

Fresh view of the hot brown dwarf HD 984 B through high-resolution spectroscopy

17 April 2024 by J. Costes and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

Orbital and Atmospheric Characterization of the 1RXS J034231.8+121622 System Using High-Resolution Spectroscopy Confirms That The Companion is a Low-Mass Star

11 April 2024 by Clarissa R. Do Ó. and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

Vortex Fiber Nulling for Exoplanet Observations: First Direct Detection of M Dwarf Companions around HIP 21543, HIP 94666, and HIP 50319

26 March 2024 by Daniel Echeverri and others

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

Validation of elemental and isotopic abundances in late-M spectral types with the benchmark HIP 55507 AB system

4 December 2023 by Jerry Xuan and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

Atmospheric metallicity and C/O of HD 189733 b from high-resolution spectroscopy

30 November 2023 by Luke Finnerty and others

Earth and Planetary Astrophysics

Calibration Unit Design for High-Resolution Infrared Spectrograph for Exoplanet Characterization (HISPEC)

17 November 2023 by Ben Sappey and others

Instrumentation and Methods for Astrophysics

The development of HISPEC for Keck and MODHIS for TMT: science cases and predicted sensitivities

20 September 2023 by Quinn Konopacky and others at

Caltech

Instrumentation and Methods for Astrophysics, Earth and Planetary Astrophysics

Vortex Fiber Nulling for Exoplanet Observations: Implementation and First Light

12 September 2023 by Daniel Echeverri and others

Instrumentation and Methods for Astrophysics, Earth and Planetary Astrophysics

On-sky speckle nulling through a single-mode fiber with the Keck Planet Imager and Characterizer

25 July 2023 by Yinzi Xin and others

Instrumentation and Methods for Astrophysics

Keck/KPIC Emission Spectroscopy of WASP-33b

30 May 2023 by Luke Finnerty and others

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

Detecting exomoons from radial velocity measurements of self-luminous planets: application to observations of HR 7672 B and future prospects

6 February 2023 by Jean-Baptiste Ruffio and others

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

Phase II of the Keck Planet Imager and Characterizer: system-level laboratory characterization and preliminary on-sky commissioning

28 October 2022 by Daniel Echeverri and others at

Caltech

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

Retrieving C and O Abundance of HR 8799 c by Combining High- and Low-Resolution Data

4 October 2022 by Ji Wang and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

A Clear View of a Cloudy Brown Dwarf Companion from High-Resolution Spectroscopy

2 August 2022 by Jerry Xuan and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

Retrieving the C and O Abundances of HR 7672~AB: a Solar-Type Primary Star with a Benchmark Brown Dwarf

5 February 2022 by Ji Wang and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

Detection and Bulk Properties of the HR 8799 Planets with High Resolution Spectroscopy

14 July 2021 by Jason Wang and others

Earth and Planetary Astrophysics

Topics

Earth and Planetary Astrophysics Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics