18 citations · 90 across the 32 of their papers we have counts for
23 papers · 1 filter
Atmospheric characterization of six ultra-hot Jupiters from -band high-resolution spectroscopy
Luke Finnerty, Michael P. Fitzgerald, Yinzi Xin +27
We present new Keck/KPIC high-resolution spectroscopic detections of three ultra-hot Jupiters (UHJs) in the band: WASP-189b (), MASCARA-1b (), and…
Possible stratospheric emission in the warm Neptune GJ 436 b from high-resolution spectroscopy
Luke Finnerty, Michael P Fitzgerald, Jerry W Xuan +26
We present high spectral resolution band (2.91--3.85 m) observations of the warm Neptune GJ 436 b from Keck II/KPIC. KPIC's single-mode fiber feed reduces the band sky b…
Limits on the Post-eclipse Emission Spectrum of HD 80606 b From High-Resolution Spectroscop
Luke Finnerty, Aurora Kesseli, Kyle Pearson +2
We present Keck/NIRSPEC -band observations of HD 80606 b, one of the most eccentric known exoplanets. HD 80606 b was observed after secondary eclipse, close to periastron, when…
Distinct Rotational Evolution of Giant Planets and Brown Dwarf Companions
Chih-Chun Hsu, Jason J. Wang, Jerry W. Xuan +27
We present a rotational velocity (vsini) survey of 32 stellar/substellar objects and giant planets using Keck/KPIC high-resolution spectroscopy, including 6 giant planets (2-7 M$_\…
Chemical and Isotopic Homogeneity Between the L Dwarf CD-35 2722 B and its Early M Host Star
Gavin Wang, Jerry Xuan, Darío Picos +29
CD-35 2722 B is an L dwarf companion to the nearby, Myr old M1 dwarf CD-35 2722 A. We present a detailed analysis of both objects using high-resolution ($R \sim 35,00…
Dynamical Architectures of S-type Transiting Planets in Binaries II: A Dichotomy in Orbital Alignment of Small Planets in Close Binary Systems
Jingwen Zhang, Daniel Huber, Michael Bottom +35
Stellar multiplicity plays a crucial role in shaping planet formation and dynamical evolution. We present a survey of 54 TESS Objects of Interest (TOIs) within 300 pc that exhibit…
HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen
Nathalie K. Jones, Jason J. Wang, Eric L. Nielsen +51
We present confirmation of HD 143811 AB b, a substellar companion to spectroscopic binary HD 143811 AB through direct imaging with the Gemini Planet Imager (GPI) and Keck NIRC2. HD…
Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b
Anne E. Peck, William Roberson, Eric L. Nielsen +50
HD~143811~AB is the host star to the directly imaged planet HD~143811~AB~b, which was recently discovered using data from the Gemini Planet Imager and Keck NIRC2. A member of the S…
The watery atmosphere of HD~209458~b revealed by joint - and -band high-resolution spectroscopy
Luke Finnerty, Julie Inglis, Michael P. Fitzgerald +26
We present a joint analysis of high-resolution - and -band observations of the benchmark hot Jupiter \hdb\ from the Keck Planet Imager and Characterizer (KPIC). One half nigh…
Velocity shift and SNR limits for high-resolution spectroscopy of hot Jupiters using Keck/KPIC
Kevin S. Hong, Luke Finnerty, Michael P. Fitzgerald
High-resolution cross-correlation spectroscopy (HRCCS) is a technique for detecting the atmospheres of close-in planets using the change in the projected planet velocity over a few…
Water dissociation and rotational broadening in the atmosphere of KELT-20 b from high-resolution spectroscopy
Luke Finnerty, Yinzi Xin, Jerry W. Xuan +29
We present atmospheric retrievals from Keck/KPIC phase II observations of the ultra-hot Jupiter KELT-20/MASCARA-2~b. Previous free retrievals of molecular abundances for ultra-hot…
HD 206893 B at High Spectral Resolution with the Keck Planet Imager and Characterizer (KPIC)
Ben Sappey, Quinn Konopacky, Clarissa R. Do O +38
We present an atmospheric characterization and orbital analysis of HD 206893 B, an exceptionally red, L/T-transition substellar companion in a multiplanetary system, via Keck Plane…
PDS 70b Shows Stellar-like Carbon-to-oxygen Ratio
Chih-Chun Hsu, Jason J. Wang, Geoffrey A. Blake +27
The 5 Myr PDS 70 is the only known system with protoplanets residing in the cavity of the circumstellar disk from which they formed, ideal for studying exoplanet formation an…
True mass and atmospheric composition of the non-transiting hot Jupiter HD 143105 b
Luke Finnerty, Yinzi Xin, Jerry W. Xuan +28
We present Keck/KPIC phase II -band observations of the non-transiting hot Jupiter HD 143105 b. Using a cross-correlation approach, we make the first detection of the planetary…
RV measurements of directly imaged brown dwarf GQ Lup B to search for exo-satellites
Katelyn Horstman, Jean-Baptiste Ruffio, Konstantin Batygin +35
GQ Lup B is one of the few substellar companions with a detected cicumplanetary disk, or CPD. Observations of the CPD suggest the presence of a cavity, possibly formed by an exo-sa…
Fringing analysis and forward modeling of Keck Planet Imager and Characterizer (KPIC) spectra
Katelyn A. Horstman, Jean-Baptiste Ruffio, Jason J. Wang +27
The Keck Planet Imager and Characterizer (KPIC) combines high contrast imaging with high resolution spectroscopy (R~35,000 in K band) to study directly imaged exoplanets and brown…
Atmospheric characterization of the super-Jupiter HIP 99770 b with KPIC
Yapeng Zhang, Jerry W. Xuan, Dimitri Mawet +28
Young, self-luminous super-Jovian companions discovered by direct imaging provide a challenging test of planet formation and evolution theories. By spectroscopically characterizing…
Subaru/CHARIS High-Resolution Mode Spectroscopy of the Brown Dwarf Companion HD 33632 Ab
Aidan Gibbs, Briley Lewis, Michael Fitzgerald +6
Brown dwarfs (BD) are model degenerate in age and mass. High-contrast imaging and spectroscopy of BD companions to host stars where the mass and age can be independently constraine…
Are these planets or brown dwarfs? Broadly solar compositions from high-resolution atmospheric retrievals of ~10-30 companions
Jerry W. Xuan, Chih-Chun Hsu, Luke Finnerty +32
Using Keck Planet Imager and Characterizer (KPIC) high-resolution (~35000) spectroscopy from 2.29-2.49 m, we present uniform atmospheric retrievals for eight young substellar…
kappa And b is a fast rotator from KPIC High Resolution Spectroscopy
Evan C. Morris, Jason J. Wang, Chih-Chun Hsu +24
We used the Keck Planet Imager and Characterizer (KPIC) to obtain high-resolution (R35,000) K-band spectra of kappa Andromedae b, a planetary-mass companion orbiting the B9V…
Vortex Fiber Nulling for Exoplanet Observations: First Direct Detection of M Dwarf Companions around HIP 21543, HIP 94666, and HIP 50319
Daniel Echeverri, Jerry W. Xuan, John D. Monnier +35
Vortex fiber nulling (VFN) is a technique for detecting and characterizing faint companions at small separations from their host star. A near-infrared (m) VFN demonstrat…
Atmospheric metallicity and C/O of HD 189733 b from high-resolution spectroscopy
Luke Finnerty, Jerry W. Xuan, Yinzi Xin +27
We present high-resolution -band emission spectra of the quintessential hot Jupiter HD 189733 b from the Keck Planet Imager and Characterizer (KPIC). Using a Bayesian retrieval…
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems III: Aperture Masking Interferometric Observations of the star HIP 65426 at 3.8 um
Shrishmoy Ray, Steph Sallum, Sasha Hinkley +121
We present aperture masking interferometry (AMI) observations of the star HIP 65426 at as a part of the JWST Direct Imaging Early Release Science (ERS) program obtai…