161 citations · 364 across the 18 of their papers we have counts for
19 papers
Ground-based Atmospheric Characterization of Super-Earth L 98-59 d at High Spectral Resolution
Connor J. Cheverall, Nikku Madhusudhan, Savvas Constantinou +1
Atmospheric characterization of exoplanets using ground-based high-resolution transmission spectroscopy has traditionally focussed on large and close-in planets, such as hot Jupite…
The atmospheric composition of TOI-270 d
Savvas Constantinou, Nikku Madhusudhan, Måns Holmberg
The first explorations of temperate sub-Neptune exoplanets have been the hallmark of early JWST observations. The bulk properties of such planets are consistent with a range of pos…
Exploring the Sub-Neptune Frontier with JWST
Nikku Madhusudhan, Måns Holmberg, Savvas Constantinou +1
Sub-Neptune planets, with sizes and masses between those of Earth and Neptune, dominate the exoplanet population. Sub-Neptunes are expected to be the most diverse family of the exo…
A water-rich interior in the temperate sub-Neptune K2-18 b revealed by JWST
Renyu Hu, Aaron Bello-Arufe, Armen Tokadjian +7
Temperate sub-Neptunes are compelling targets for detecting liquid-water oceans beyond the Solar System. If water-rich and lacking massive hydrogen-helium envelopes, these planets…
A Systematic Search for Trace Molecules in the Atmosphere of Exoplanet K2-18 b
Lorenzo Pica-Ciamarra, Nikku Madhusudhan, Gregory J. Cooke +2
The first transmission spectrum of the habitable-zone sub-Neptune K2-18 b with JWST has opened a new avenue for atmospheric characterisation of temperate low-mass exoplanets. The o…
New Constraints on DMS and DMDS in the Atmosphere of K2-18 b from JWST MIRI
Nikku Madhusudhan, Savvas Constantinou, Måns Holmberg +3
The sub-Neptune frontier has opened a new window into the rich diversity of planetary environments beyond the solar system. The possibility of hycean worlds, with planet-wide ocean…
Towards a self-consistent evaluation of gas dwarf scenarios for temperate sub-Neptunes
Frances E. Rigby, Lorenzo Pica-Ciamarra, Måns Holmberg +6
The recent JWST detections of carbon-bearing molecules in a habitable-zone sub-Neptune have opened a new era in the study of low-mass exoplanets. The sub-Neptune regime spans a wid…
Exoplanet Transit Spectroscopy with JWST NIRSpec: Diagnostics and Homogeneous Case Study of WASP-39 b
Subhajit Sarkar, Nikku Madhusudhan, Savvas Constantinou +1
The JWST has ushered in a new era of exoplanet transit spectroscopy. Among the JWST instruments, the Near-Infrared Spectrograph (NIRSpec) has the most extensive set of configuratio…
High-resolution Spectroscopic Reconnaissance of a Temperate Sub-Neptune
Samuel H. C. Cabot, Nikku Madhusudhan, Savvas Constantinou +4
The study of temperate sub-Neptunes is the new frontier in exoplanetary science. A major development in the past year has been the first detection of carbon-bearing molecules in th…
VIRA: An Exoplanet Atmospheric Retrieval Framework for JWST Transmission Spectroscopy
Savvas Constantinou, Nikku Madhusudhan
JWST observations are leading to important new insights into exoplanetary atmospheres through transmission spectroscopy. In order to harness the full potential of the broad spectra…
Carbon-bearing Molecules in a Possible Hycean Atmosphere
Nikku Madhusudhan, Subhajit Sarkar, Savvas Constantinou +3
The search for habitable environments and biomarkers in exoplanetary atmospheres is the holy grail of exoplanet science. The detection of atmospheric signatures of habitable Earth-…
A precise blue-optical transmission spectrum from the ground: Evidence for haze in the atmosphere of WASP-74b
Petros Spyratos, Nikolay K. Nikolov, Savvas Constantinou +5
We report transmission spectroscopy of the bloated hot Jupiter WASP-74b in the wavelength range from 4000 to 6200 Å. We observe two transit events with the Very Large Telescope FOc…
Early Insights for Atmospheric Retrievals of Exoplanets using JWST Transit Spectroscopy
Savvas Constantinou, Nikku Madhusudhan, Siddharth Gandhi
We have entered the era of the James Webb Space Telescope (JWST). We use the first JWST transmission spectrum of the hot Saturn-mass exoplanet, WASP-39 b, obtained with the NIRSpec…
Characterising Atmospheres of Cloudy Temperate Mini-Neptunes with JWST
Savvas Constantinou, Nikku Madhusudhan
The upcoming James Webb Space Telescope (JWST) promises a generational shift in the study of temperate mini-Neptune atmospheres using transit spectroscopy. High-altitude clouds how…
Habitability and Biosignatures of Hycean Worlds
Nikku Madhusudhan, Anjali A. A. Piette, Savvas Constantinou
We investigate a new class of habitable planets composed of water-rich interiors with massive oceans underlying H2-rich atmospheres, referred to here as Hycean worlds. With densiti…
Transmission spectroscopy with VLT FORS2: a featureless spectrum for the low-density transiting exoplanet WASP-88b
Petros Spyratos, Nikolay Nikolov, John Southworth +10
We present ground-based optical transmission spectroscopy of the low-density hot Jupiter WASP-88b covering the wavelength range 4413-8333 Å with the FORS2 spectrograph on the Very…
Ground-Based Transmission Spectroscopy with VLT FORS2: Evidence for faculae and clouds in the optical spectrum of the warm Saturn WASP-110b
Nikolay Nikolov, Gracjan Maciejewski, Savvas Constantinou +12
We present a ground-based optical transmission spectrum for the warm Saturn-mass exoplanet WASP-110b from two transit observations made with the FOcal Reducer and Spectrograph (FOR…
Ground-Based Transmission Spectroscopy with FORS2: A featureless optical transmission spectrum and detection of HO for the ultra-hot Jupiter WASP-103b
J. Wilson, N. P. Gibson, N. Nikolov +11
We report ground-based transmission spectroscopy of the highly irradiated and ultra-short period hot-Jupiter WASP-103b covering the wavelength range 400-600 nm using the…
Neutral Cr and V in the atmosphere of ultra hot jupiter WASP-121 b
Maya Ben-Yami, Nikku Madhusudhan, Samuel H. C. Cabot +4
Ultra hot jupiters (UHJs), giant exoplanets with equilibrium temperatures above 2000 K, are ideal laboratories for studying metal compositions of planetary atmospheres. At these te…