J. Bean

New and Updated Rossiter-McLaughlin Measurements for Three Hot Jupiter-Hosting M Dwarfs

Drew Weisserman, Ryan Cloutier, Alexandra Rochon +12

Evidence suggests that Kozai-Lidov high-eccentricity migration (HEM) is the dominant migration channel for short-period Giant Exoplanets around M dwarf Stars (GEMS). However, it is…

A Pair of Warm Saturn-mass Planets near the 2:1 Mean Motion Resonance around TOI-3850

Sean Collins, Michelle Kunimoto, Nicolas B. Cowan +24

Warm Jupiters, with orbital periods of $10$ -- $200 days$ and radii exceeding $8 R_{\oplus}$ , are a relatively understudied class of exoplanets occupying the parameter space bet…

The Neptunian ridge planet WASP-156 b does not have a polar orbit

M. Lafarga, J. I. Espinoza-Retamal, H. M. Cegla +26

The population of short-period exo-Neptunes is thought to be shaped by an interplay between different dynamical mechanisms, such as orbital migration and tidal effects, and photoev…

RV and TTV Measurements of Two Transiting Long-Period Giants around TOI-4600

Tong Hu, Zitao Lin, Sharon X. Wang +27

TOI-4600b and c, originally identified by the Transiting Exoplanet Survey Satellite (TESS) and reported by I. Mireles et al. (2023), are a rare pair of transiting long-period giant…

Searching for GEMS: TOI-5349b is a Saturn-like planet orbiting a metal-rich early M-dwarf

Angeli Sandoval, Caleb I. Cañas, Shubham Kanodia +27

We report the confirmation and analysis of TOI-5349b, a transiting, warm, Saturn-like planet orbiting an early M-dwarf with a period of $\sim$ 3.3 days, which we confirmed as part o…

Aligned Stellar Obliquities for Two Hot Jupiter-hosting M Dwarfs Revealed by MAROON-X: Implications for Hot Jupiter Formation

Drew Weisserman, Erik Gillis, Ryan Cloutier +14

Hot Jupiters (HJs) are $2 - 3 \times$ less common around early M dwarfs than around AFGK stars, suggesting that HJs may form and/or migrate via distinct pathways around different type…

astro-ph.EP2025★ 7 cited

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…

astro-ph.EP2025★ 1 cited

Calibrating the Instrumental Drift in MAROON-X using an Ensemble Analysis

Ritvik Basant, Tanya Das, Jacob L. Bean +7

MAROON-X is a state-of-the-art extreme precision radial velocity spectrograph deployed on the 8.1-meter Gemini-N telescope on Maunakea, Hawai'i. Using a stabilized Fabry-Pérot etal…

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…

Revised Masses for Low Density Planets Orbiting the Disordered M-dwarf System TOI-1266

Dakotah Tyler, Erik A. Petigura, James Rogers +5

We present an analysis of 126 new radial velocity measurements from the MAROON-X spectrograph to investigate the TOI-1266 system, which hosts two transiting sub-Neptunes at 10.8 an…

astro-ph.EP2024★ 1 cited

The Compositions of Rocky Planets in Close-in Orbits Tend to be Earth-Like

Casey L. Brinkman, Lauren M. Weiss, Daniel Huber +54

Hundreds of exoplanets between 1-1.8 times the size of the Earth have been discovered on close in orbits. However, these planets show such a diversity in densities that some appear…

Searching for GEMS: Characterizing Six Giant Planets around Cool Dwarfs

Shubham Kanodia, Arvind F. Gupta, Caleb I. Canas +42

Transiting giant exoplanets around M-dwarf stars (GEMS) are rare, owing to the low-mass host stars. However, the all-sky coverage of TESS has enabled the detection of an increasing…

astro-ph.EP2024★ 7 cited

The Aligned Orbit of a Hot Jupiter around the M Dwarf TOI-4201

Tianjun Gan, Sharon X. Wang, Fei Dai +12

Measuring the obliquities of stars hosting giant planets may shed light on the dynamical history of planetary systems. Significant efforts have been made to measure the obliquities…

astro-ph.SR2024

Stellar Characterization and Chemical Abundances of Exoplanet Hosting M dwarfs from APOGEE Spectra: Future JWST Targets

Edypo Melo, Diogo Souto, Katia Cunha +11

Exoplanets hosting M dwarfs are the best targets to characterize Earth-like or super-Earth planetary atmospheres with the James Webb Space Telescope (JWST). We determine detailed s…

astro-ph.EP2024★ 1 cited

TOI-1685 b is a Hot Rocky Super-Earth: Updates to the Stellar and Planet Parameters of a Popular JWST Cycle 2 Target

Jennifer A. Burt, Matthew J. Hooton, Eric E. Mamajek +12

We present an updated characterization of the TOI-1685 planetary system, which consists of a P $_{b}$ = 0.69\,day USP super-Earth planet orbiting a nearby ( $d$ = 37.6\,pc) M2.5…