activity
20242026
most citedThe compositions of the HR 8799 planets reflect accretion of both solids and metal-enriched gas

12 citations · 32 across the 8 of their papers we have counts for

collaborators

9 papers

astro-ph.IM2026

The Roman Coronagraph Community Participation Program: data reduction pipeline design and implementation

Jason J. Wang, Maxwell A. Millar-Blanchaer, Marie Ygouf +39

The Roman Space Telescope Coronagraph Instrument will demonstrate a series of technologies and techniques to enable the direct detection of reflected-light planets with space-based…

astro-ph.EP2026

A High-Resolution Spectroscopic Survey of Directly Imaged Companion Hosts: III. Characterization of the Cold Imaged Planet Hosts AF Lep A and Indi A

Aneesh Baburaj, Quinn M. Konopacky, Christopher A. Theissen +3

JWST has enabled the measurement of carbon, oxygen, and sulfur abundances in the atmospheres of directly imaged planets. Interpretation of these abundances from a planet formation…

astro-ph.EP2026

A Sulfur-Rich Atmosphere for the Young Jupiter Analog AF Lep b Reveals Significant Solid Accretion

Jerry W. Xuan, William O. Balmer, Yayaati Chachan +25

AF Lep b is one of the closest analogs to Jupiter in terms of mass () and semi-major axis ( AU) amenable to spectroscopic characterization. We present JWST/NIR…

astro-ph.EP2026

Discovery of an Exterior Third Planet Orbiting Pictoris

Aidan Gibbs, Jean-Baptiste Ruffio, Alexis Bidot +9

We report the discovery of Pictoris d ( Pic d), a third giant planet in the Pictoris system, which now becomes only the second directly imaged system with more than two…

astro-ph.EP2026

JWST-TST High Contrast: First Direct Spectroscopy of GJ 504 b reveals Clouds and Possible Metal Enrichment

Aneesh Baburaj, Jean-Baptiste Ruffio, Marshall Perrin +27

Characterizing the coldest directly imaged companions through direct spectroscopy has only recently become possible with the James Webb Space Telescope. We present moderate-resolut…

astro-ph.EP2026★ 12 cited

The compositions of the HR 8799 planets reflect accretion of both solids and metal-enriched gas

Jerry W. Xuan, Jean-Baptiste Ruffio, Yayaati Chachan +24

With four giant planets (, $T_\rm{eff}\sim900-1200$ K) orbiting between 15-70 au, HR 8799 provides an unparalleled testbed for studying giant planet formatio…

astro-ph.EP2025★ 3 cited

A High-Resolution Spectroscopic Survey of Directly Imaged Companion Hosts: II. Diversity in C/O Ratios among Host Stars

Aneesh Baburaj, Quinn M. Konopacky, Christopher A. Theissen +2

The era of JWST has enabled measurements of abundances of elements such as C, O, and even Na, S, K, and Fe in planetary atmospheres to very high precisions (0.1 dex). Accurat…

astro-ph.EP2025★ 8 cited

Direct Spectroscopy of 51 Eridani b with JWST NIRSpec

Alexander Madurowicz, Jean-Baptiste Ruffio, Bruce Macintosh +4

We present high-contrast direct spectroscopy of the low-mass, cool exoplanet 51 Eridani b (2-4 M, 750 K) using JWST / NIRSpec in a fixed-slit configuration (F2…

astro-ph.EP2024★ 9 cited

A High-Resolution Spectroscopic Survey of Directly Imaged Companion Hosts: I. Determination of diagnostic stellar abundances for planet formation and composition

Aneesh Baburaj, Quinn M. Konopacky, Christopher A. Theissen +6

We present the first results of an extensive spectroscopic survey of directly imaged planet host stars. The goal of the survey is the measurement of stellar properties and abundanc…