Tanya Das

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

Drew Weisserman, Ryan Cloutier, A. Rochon, Ze’ev Vladimir et autres

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 unlikely that all short-period GEMS form via HEM, given that most systems lack known massive companions capable of …

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

Sean Collins, Michelle Kunimoto, Nicolas B. Cowan, Keivan G. Stassun et autres

Warm Jupiters, with orbital periods of $10$--$200~\rm{days}$ and radii exceeding $8~R_{\oplus}$, are a relatively understudied class of exoplanets occupying the parameter space between hot Jupiters and more widely separated, colder Jupiter analogs. In this work, we report the detection of a multi-planet …

Characterizing fiber and detector systematics of the MAROON-X EPRV spectrograph on Gemini North

Tanya Das, Andreas Seifahrt, Jacob L. Bean, Julian Stürmer et autres

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

Tong Hu, Zitao Lin, Sharon X. Wang, Mu-Tian Wang et autres

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 planets ($\rm P_b=82.7$ days, $\rm P_c=482.8$ days) orbiting an early K dwarf. In this …

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

Tong Hu, Zitao Lin, Sharon X. Wang, Mu-Tian Wang et autres

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 planets ($\rm P_b=82.7$ days, $\rm P_c=482.8$ days) orbiting an early K dwarf. In this …

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The JWST Rocky Worlds DDT Program Reveals GJ 3929b to Likely Be a Bare Rock

Qiao Xue, Michael Zhang, Brandon Park Coy, Madison Brady et autres

Abstract 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 MIRI photometric imaging at 15 μ m. We present a reduction of these data using …

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An Earthlike Density for the Temperate Earth-sized Planet GJ 12 b

Madison Brady, Jacob L. Bean, Ritvik Basant, N. M. Brown et autres

Abstract 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 severely complicate efforts at studying their planets. GJ 12 b is a newly discovered …

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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, N. M. Brown et autres

Abstract Hot Jupiters (HJs) are 2–3× less common around M dwarfs than around AFGK stars, suggesting that HJs may form and/or migrate via distinct pathways around different types of stars. One source of insight into HJ formation mechanisms is to trace their …

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, N. M. Brown et autres

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 types of stars. One source of insight into HJ formation mechanisms is to trace their …

An Earth-like Density for the Temperate Earth-sized Planet GJ 12b

Madison Brady, Jacob L. Bean, Ritvik Basant, N. M. Brown et autres

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 severely complicate efforts at studying their planets. GJ 12b is a newly-discovered temperate (Teq ~ 300 …

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

Ritvik Basant, Tanya Das, Jacob L. Bean, R. Luque et autres

Abstract MAROON-X is a state-of-the-art extreme-precision radial velocity spectrograph deployed on the 8.1 m Gemini-N telescope on Maunakea, Hawai’i. Using a stabilized Fabry–Pérot etalon for wavelength and drift calibration, MAROON-X has achieved a short-term precision of ∼30 cm s−1. However, due to …

Four Sub-Earth Planets Orbiting Barnard’s Star from MAROON-X and ESPRESSO

Ritvik Basant, R. Luque, Jacob L. Bean, Andreas Seifahrt et autres

Abstract 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 and astrometry. However, none of these claimed detections have so far withstood further …