Munazza K. Alam

Detection of escaping magnesium in the upper atmosphere of WASP-76b

Lakeisha M. Ramos Rosado, Leonardo A. Dos Santos, Joshua D. Lothringer +8

Near-ultraviolet (NUV) observations can uniquely probe low-density, high-altitude gas in ultra-hot Jupiters (UHJs) via strong resonance lines of metals. WASP-76b is a well-studied…

No Helium Detected in LHS 1140 b from Four JWST NIRISS/SOSS Transits

Katherine A. Bennett, Carlos Gascón, Jacob Lustig-Yaeger +13

In the effort to determine which low-mass exoplanets have atmospheres, LHS 1140 b remains one of the most favorable targets. Its large size (5.6 $M_{\oplus}$ and 1.7 $\rm R_{\o…

Early Exploration of the Scientific Discovery Space for the Habitable Worlds Observatory

Courtney D. Dressing, Danica Adams, Evelyne Alecian +324

The Habitable Worlds Observatory (HWO) is a future NASA flagship mission concept identified by the Astro2020 Decadal Survey as the highest priority for large space missions. HWO sh…

Breaking the brightness barrier: JWST/NIRCam DHS spectroscopy for high-precision time-series observations

Achrene Dyrek, John Stansberry, Louis E. Bergeron +12

Many of the most scientifically compelling exoplanets orbit bright nearby stars that exceed the brightness limits of existing JWST spectroscopic observing modes. To address this li…

Characterizing Transiting Exoplanet Atmospheres in the 2030s with the Hubble Space Telescope

Joshua D. Lothringer, Hannah R. Wakeford, Robert C. Frazier +7

The Hubble Space Telescope inaugurated the era of exoplanet atmospheric characterization. While the James Webb Space Telescope has largely taken up the mantle of infrared atmospher…

The role of the Hubble Space Telescope in advancing our understanding of atmospheric escape in exoplanets

Leonardo A. Dos Santos, Arika Egan, Kevin France +14

An important evolutionary pathway for planetary atmospheres is escape to space, which has been studied on Earth and Mars for several decades and more recently in exoplanets. A part…

JWST COMPASS Program: The 3--5 $μ$ m transmission spectrum of LTT 1445 A b

Natasha E. Batalha, Nicole Wallack, Tyler Gordon +16

The search for an atmosphere on the closest rocky M dwarf planet, LTT 1445 A b, has been the subject of intense investigation from both the ground and space. Here, we present the f…

JWST COMPASS: A NIRSpec G395H Transmission Spectrum of Radius Valley-Dweller TOI-260 b

Annabella Meech, Peter Gao, Nicole L. Wallack +16

We present a JWST/NIRSpec G395H transmission spectrum of TOI-260 b, a $T_{eq} \sim 490$ K, $R_{p} = 1.76 R_{\oplus}$ planet. The transmission spectrum is derived by com…

JWST COMPASS: NIRSpec/G395H Transmission Observations of the Sub-Neptune HD 15337 c

Nicole L. Wallack, Peter Gao, Michael Greklek-McKeon +17

We present the 3-5 $μ$ m transmission spectrum of HD 15337 c (TOI-402.02), a sub-Neptune (2.526 R $_{\oplus}$ , 6.792 M $_{\oplus}$ , T $_{eq}$ $\sim$ 656 K) around a K1V star observed…

astro-ph.EP2025★ 10 cited

Charge Migration and Residual Non-Linearity in NIRSpec BOTS Observations

Munazza K. Alam, Leonardo Ubeda, Qinyan +3

We investigate the effect of charge migration and residual non-linearity on the JWST/NIRSpec G395H NRS1 and NRS2 detectors using Bright Object Time Series (BOTS) observations of th…

astro-ph.IM2025

Analyzing Exoplanet Transits Observed with the WFC3/UVIS G280 Grism

Munazza K. Alam, Frederick Dauphin, Amanda Pagul

Here we describe a Jupyter notebook demonstrating methods for the reduction and analysis of exoplanet transit observations taken with the WFC3/UVIS G280 grism. Released on Space Te…

astro-ph.EP2025★ 4 cited

A Comprehensive Analysis of the Panchromatic Transmission Spectrum of the Hot-Saturn WASP-96 b: Nondetection of Haze, Possible Sodium Limb Asymmetry, Stellar Characterization, and Formation History

Le-Chris Wang, Zafar Rustamkulov, David K. Sing +4

We conduct a reanalysis of the JWST NIRISS/SOSS observation of the hot-Saturn WASP-96 b. Initial analysis of this data revealed an enhanced Rayleigh scattering slope at the blue en…

Additional JWST/NIRSpec Transits of the Rocky M Dwarf Exoplanet GJ 1132 b Reveal a Featureless Spectrum

Katherine A. Bennett, Ryan J. MacDonald, Sarah Peacock +17

As an archetypal M-dwarf rocky exoplanet, GJ 1132 b has a varied history of atmospheric measurements. At 1.13 $R_{\oplus}$ , 1.66 $M_{\oplus}$ , and 580 K, it orbits a bright…

JWST COMPASS: A NIRSpec G395H Transmission Spectrum of the Super-Earth GJ 357 b

Jea Adams Redai, Nicholas Wogan, Nicole L. Wallack +14

We present JWST NIRSpec/G395H transmission spectroscopy observations of GJ 357 b, a warm ( $T_{eq} \approx 525$ K) super-Earth ( $1.2 R_{\oplus}$ , $1.84\ \mathrm{…

astro-ph.IM2025★ 1 cited

Exoplanet Atmospheric Escape Observations with the Habitable Worlds Observatory

Leonardo A. Dos Santos, Eric D. Lopez, Luca Fossati +15

The Decadal Survey on Astronomy and Astrophysics 2020 highlights the importance of advancing research focused on discovering and characterizing habitable worlds. In line with this…

The HUSTLE Program: The UV to Near-IR Transmission Spectrum of the Hot Jupiter KELT-7b

Carlos Gascón, Mercedes López-Morales, Ryan J. MacDonald +14

The ultraviolet and optical wavelength ranges have proven to be a key addition to infrared observations of exoplanet atmospheres, as they offer unique insights into the properties…

A Ground-Based Transit Observation of the Long-Period Extremely Low-Density Planet HIP 41378 f

Juliana García-Mejía, Zoë L. de Beurs, Patrick Tamburo +25

We present a ground-based transit detection of HIP 41378 f, a long-period ( $P = 542$ days), extremely low-density ( $0.09 \pm 0.02$ g cm $^{- 3}$ ) giant exoplanet in a dynamically com…

HST SHEL: Revealing Haze and Confirming Elevated Metallicity in the Warm Neptune HAT-P-26b

Lakeisha M. Ramos Rosado, David K. Sing, Natalie H. Allen +6

We present a new and extended transmission spectrum of the warm Neptune HAT-P-26b spanning wavelengths between 0.29 - 5.0 microns. This spectrum is derived from new HST STIS G430L…