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…

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…

astro-ph.EP2025★ 10 cited

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★ 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{…

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…

astro-ph.EP2025★ 21 cited

JWST COMPASS: NIRSpec/G395H Transmission Observations of TOI-776 c, a 2 Rearth M Dwarf Planet

Johanna Teske, Natasha E. Batalha, Nicole L. Wallack +16

The atmospheres of planets between the size of Earth and Neptune at short orbital periods have been under intense scrutiny. Of the ~dozen planets in this regime with atmospheres st…

JWST COMPASS: NIRSpec/G395H Transmission Observations of the Super-Earth TOI-776b

Lili Alderson, Sarah E. Moran, Nicole L. Wallack +15

We present two transit observations of the $\sim$ 520K, 1.85R $_{\oplus}$ , 4.0M $_{\oplus}$ super-Earth TOI-776b with JWST NIRSpec/G395H, resulting in a 2.8-5.2 $μ$ m transmission spectrum.…

astro-ph.EP2024★ 1 cited

JWST COMPASS: The first near- to mid-infrared transmission spectrum of the hot super-Earth L 168-9 b

Munazza K. Alam, Peter Gao, Jea Adams Redai +14

We present the first broadband near- to mid-infrared (3-12 microns) transmission spectrum of the highly-irradiated (T_eq = 981 K) M dwarf rocky planet L 168-9 b (TOI-134 b) observe…

astro-ph.EP2024★ 96 cited

The Clear Sky Corridor: Insights Towards Aerosol Formation in Exoplanets Using An AI-based Survey of Exoplanet Atmospheres

Reza Ashtari, Kevin B. Stevenson, David Sing +4

Producing optimized and accurate transmission spectra of exoplanets from telescope data has traditionally been a manual and labor-intensive procedure. Here we present the results o…

astro-ph.EP2024★ 1 cited

JWST COMPASS: The 3-5 Micron Transmission Spectrum of the Super-Earth L 98-59 c

Nicholas Scarsdale, Nicholas Wogan, Hannah R. Wakeford +14

We present a JWST NIRSpec transmission spectrum of the super-Earth exoplanet L 98-59 c. This small (R $_{p} = 1.385 \pm 0.085$ R $_{\oplus}$ , M $_{p} = 2.22 \pm 0.26$ R $_{\oplus}$ ), warm (T$_\textrm{eq…

Sulphur dioxide in the mid-infrared transmission spectrum of WASP-39b

Diana Powell, Adina D. Feinstein, Elspeth K. H. Lee +70

The recent inference of sulphur dioxide (SO $_{2}$ ) in the atmosphere of the hot ( $\sim$ 1100 K), Saturn-mass exoplanet WASP-39b from near-infrared JWST observations suggests that phot…

HST SHEL: Enabling Comparative Exoplanetology with HST/STIS

Natalie H. Allen, David K. Sing, Néstor Espinoza +12

The Hubble Space Telescope (HST) has been our most prolific tool to study exoplanet atmospheres. As the age of JWST begins, there is a wealth of HST archival data that is useful to…

Non-Detections of Helium in the Young Sub-Jovian Planets K2-100b, HD 63433b, & V1298 Tau c

Munazza K. Alam, James Kirk, Leonardo A. Dos Santos +10

We search for excess in-transit absorption of neutral helium at 1.083 $μ$ m in the atmospheres of the young (<800 Myr) sub-Jovian (0.2-0.5 $R_{J}$ ) planets HD 63433b, K2-100b, a…

JWST COMPASS: A NIRSpec/G395H Transmission Spectrum of the Sub-Neptune TOI-836c

Nicole L. Wallack, Natasha E. Batalha, Lili Alderson +13

Planets between the sizes of Earth and Neptune are the most common in the Galaxy, bridging the gap between the terrestrial and giant planets in our Solar System. Now that we are fi…

JWST COMPASS: NIRSpec/G395H Transmission Observations of the Super-Earth TOI-836b

Lili Alderson, Natasha E. Batalha, Hannah R. Wakeford +13

We present two transit observations of the ~870K, 1.7R $_{E}$ super-Earth TOI-836b with JWST NIRSpec/G395H, resulting in a 2.8-5.2 $μ$ m transmission spectrum. Using two different reduc…

astro-ph.EP2024★ 5 cited

Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b

Taylor J. Bell, Nicolas Crouzet, Patricio E. Cubillos +80

Hot Jupiters are among the best-studied exoplanets, but it is still poorly understood how their chemical composition and cloud properties vary with longitude. Theoretical models pr…