155 citations · 966 across the 31 of their papers we have counts for
33 papers
The atomic C/O ratio of KELT-9b
Stefan Pelletier, Nicholas W. Borsato, Jacob L. Bean +12
The carbon-to-oxygen (C/O) ratio of a giant planet's atmosphere has long been theorised to hold compositional information that can be traced back to its formation history. Typicall…
Laboratory characterization of iLocater
Marcelo Tala Pinto, Marshall C. Johnson, Julia Brady +18
iLocater is a diffraction-limited, fiber-fed spectrograph designed for the Large Binocular Telescope (LBT), which targets high-precision radial velocity measurements in the near-in…
Commissioning and on-sky performance verification of iLocater
Marshall C. Johnson, Marcelo Tala Pinto, Jonathan Crass +59
iLocater is a high-resolution near-infrared extreme precision radial velocity (EPRV) spectrograph that was deployed to the Large Binocular Telescope (LBT) in June 2026. iLocater op…
The Calibration System of the iLocater Spectrograph
Sai Vidyud Senthil Nathan, Jonathan Crass, Julia E. Brady +21
iLocater is a new near-infrared, extreme precision radial velocity (EPRV) instrument delivered to the Large Binocular Telescope in the summer of 2026. The instrument utilizes singl…
The JWST Rocky Worlds DDT Program reveals GJ 3929b to likely be a bare rock
Qiao Xue, Michael Zhang, Brandon P. Coy +14
We report first results from the JWST Rocky Worlds Director's Discretionary Time program. Two secondary eclipses of the terrestrial exoplanet GJ 3929b were recently observed using…
An Aligned Sub-Neptune Revealed with MAROON-X and a Tendency Towards Alignment for Small Planets
Alex S. Polanski, Ian J. M. Crossfield, Andreas Seifahrt +9
We present the Rossiter-McLaughlin measurement of the sub-Neptune TOI-1759A b with MAROON-X. A joint analysis with MuSCAT3 photometry and nine additional TESS transits produces a s…
An Earth-like Density for the Temperate Earth-sized Planet GJ 12b
Madison Brady, Jacob Bean, Ritvik Basant +9
While JWST has provided us with the opportunity to probe the atmospheres of potentially-habitable planets, observations of the TRAPPIST-1 system have shown us that active stars sev…
Four sub-Earth planets orbiting Barnard's Star from MAROON-X and ESPRESSO
Ritvik Basant, Rafael Luque, Jacob L. Bean +9
Barnard's Star is an old, single M dwarf star that comprises the second-closest extrasolar system. It has a long history of claimed planet detections from both radial velocities an…
A Small Brown Dwarf in an Aligned Orbit around a Young, Fully-Convective M Star
M. Brady, J. Bean, G. Stefánsson +6
A star's spin-orbit angle can give us insight into a system's formation and dynamical history. In this paper, we use MAROON-X observations of the Rossiter-McLaughlin (RM) effect to…
Early Results from the HUMDRUM Survey: A Small, Earth-mass Planet Orbits TOI-1450A
M. Brady, J. Bean, A. Seifahrt +23
M dwarf stars provide us with an ideal opportunity to study nearby small planets. The HUMDRUM (HUnting for M Dwarf Rocky planets Using MAROON-X) survey uses the MAROON-X spectrogra…
A Wolf 359 in sheep's clothing: Hunting for substellar companions in the fifth-closest system using combined high-contrast imaging and radial velocity analysis
Rachel Bowens-Rubin, Joseph M. Akana Murphy, Philip M. Hinz +16
Wolf 359 (CN Leo, GJ 406, Gaia DR3 3864972938605115520) is a low-mass star in the fifth-closest neighboring system (2.41 pc). Because of its relative youth and proximity, Wolf 359…
Updated Planetary Mass Constraints of the Young V1298 Tau System Using MAROON-X
James Sikora, Jason Rowe, Saugata Barat +14
The early K-type T-Tauri star, V1298 Tau (, ) hosts four transiting planets with radii ranging from . The thre…
Measuring the Obliquities of the TRAPPIST-1 Planets with MAROON-X
Madison Brady, Jacob Bean, Andreas Seifahrt +6
A star's obliquity with respect to its planetary system can provide us with insight into the system's formation and evolution, as well as hinting at the presence of additional obje…
MAROON-X: The first two years of EPRVs from Gemini North
Andreas Seifahrt, Jacob L. Bean, David Kasper +11
MAROON-X is a fiber-fed, optical EPRV spectrograph at the 8-m Gemini North Telescope on Mauna Kea, Hawai'i. MAROON-X was commissioned as a visiting instrument in December 2019 and…
TOI-561 b: A Low Density Ultra-Short Period "Rocky" Planet around a Metal-Poor Star
Casey Brinkman, Lauren M. Weiss, Fei Dai +22
TOI-561 is a galactic thick disk star hosting an ultra-short period (0.45 day orbit) planet with a radius of 1.37 R, making it one of the most metal-poor ([Fe/H] = -0.41…
The CUBES Science Case
Chris Evans, Stefano Cristiani, Cyrielle Opitom +51
We introduce the scientific motivations for the development of the Cassegrain U-Band Efficient Spectrograph (CUBES) that is now in construction for the Very Large Telescope. The as…
CUBES and its software ecosystem: instrument simulation, control, and data processing
Giorgio Calderone, Roberto Cirami, Guido Cupani +11
CUBES (Cassegrain U-Band Efficient Spectrograph) is the recently approved high-efficiency VLT spectrograph aimed to observe the sky in the UV ground-based region (305-400 nm) with…
CUBES, the Cassegrain U-Band Efficient Spectrograph
S. Cristiani, J. M. Alcalá, S. H. P. Alencar +74
In the era of Extremely Large Telescopes, the current generation of 8-10m facilities are likely to remain competitive at ground-UV wavelengths for the foreseeable future. The Casse…
Unifying High- and Low-resolution Observations to Constrain the Dayside Atmosphere of KELT-20b/MASCARA-2b
David Kasper, Jacob L. Bean, Michael R. Line +10
We present high-resolution dayside thermal emission observations of the exoplanet KELT-20b/MASCARA-2b using the MAROON-X spectrograph. Applying the cross-correlation method with bo…
Confirmation of Iron Emission Lines and Non-detection of TiO on the Dayside of KELT-9b with MAROON-X
David H. Kasper, Jacob L. Bean, Michael R. Line +5
We present dayside thermal emission observations of the hottest exoplanet KELT-9b using the new MAROON-X spectrograph. We detect atomic lines in emission with a signal-to-noise rat…
A Second Planet Transiting LTT 1445A and a Determination of the Masses of Both Worlds
J. G. Winters, R. Cloutier, A. A. Medina +79
LTT 1445 is a hierarchical triple M-dwarf star system located at a distance of 6.86 parsecs. The primary star LTT 1445A (0.257 M_Sun) is known to host the transiting planet LTT 144…
On-sky commissioning of MAROON-X: A new precision radial velocity spectrograph for Gemini North
A. Seifahrt, J. L. Bean, J. Stürmer +10
MAROON-X is a fiber-fed, red-optical, high precision radial velocity spectrograph recently commissioned at the Gemini North telescope on Mauna Kea, Hawai'i. With a resolving power…
A nearby transiting rocky exoplanet that is suitable for atmospheric investigation
T. Trifonov, J. A. Caballero, J. C. Morales +66
Spectroscopy of transiting exoplanets can be used to investigate their atmospheric properties and habitability. Combining radial velocity (RV) and transit data provides additional…
A giant exoplanet orbiting a very low-mass star challenges planet formation models
J. C. Morales, A. J. Mustill, I. Ribas +179
Statistical analyses from exoplanet surveys around low-mass stars indicate that super-Earth and Neptune-mass planets are more frequent than gas giants around such stars, in agreeme…