216 citations · 2.3k across the 38 of their papers we have counts for
38 papers
Direct imaging characterization of cool gaseous planets
Michiel Min, Jo Barstow, Laura C. Mayorga +19
Cool gas giant exoplanets, particularly those with properties similar to those of Jupiter and Saturn, remain poorly characterized due to current observational limitations. This whi…
Astroclimes -- measuring the abundance of CO and CH in the Earth's atmosphere using astronomical observations
Marcelo Aron Fetzner Keniger, David Armstrong, Matteo Brogi +2
Monitoring the abundance of greenhouse gases (GHGs) such as carbon dioxide (CO) and methane (CH) is necessary to quantify their impact on global warming and climate change.…
The Roasting Marshmallows Program with IGRINS on Gemini South III: Seeing deeper into the metal depleted atmosphere of a gas-giant on the cusp of the hot to ultra-hot Jupiter transition
Vatsal Panwar, Matteo Brogi, Krishna Kanumalla +17
Ultra-hot Jupiters are a class of gas-giant exoplanets that show a peculiar combination of thermochemical properties in the form of molecular dissociation, atomic ionization, and i…
Tracing the formation and migration history: molecular signatures in the atmosphere of misaligned hot Jupiter WASP-94Ab using JWST NIRSpec/G395H
Eva-Maria Ahrer, Siddharth Gandhi, Lili Alderson +12
The discovery of hot Jupiters that orbit very close to their host stars has long challenged traditional models of planetary formation and migration. Characterising their atmospheri…
Detectability of oxygen fugacity regimes in the magma ocean world 55 Cancri e at high spectral resolution
Spandan Dash, Matteo Brogi, Fabian Lukas Seidler +5
Ultra-short Period exoplanets (USPs) like 55 Cnc e, hosting dayside magma oceans, present unique opportunities to study surface-atmosphere interactions. The composition of a vapori…
The mystery of water in the atmosphere of Boötis b continues: insights from revisiting archival CRIRES observations
Vatsal Panwar, Matteo Brogi, Siddharth Gandhi +2
The chemical abundances of gas-giant exoplanet atmospheres hold clues to the formation and evolution pathways that sculpt the exoplanet population. Recent ground-based high-resolut…
Phase-resolving the absorption signatures of water and carbon monoxide in the atmosphere of the ultra-hot Jupiter WASP-121b with GEMINI-S/IGRINS
Joost P. Wardenier, Vivien Parmentier, Michael R. Line +12
Ultra-hot Jupiters are among the best targets for atmospheric characterization at high spectral resolution. Resolving their transmission spectra as a function of orbital phase offe…
Revealing HO dissociation in WASP-76~b through combined high- and low-resolution transmission spectroscopy
Siddharth Gandhi, Rico Landman, Ignas Snellen +3
Numerous chemical constraints have been possible for exoplanetary atmospheres thanks to high-resolution spectroscopy (HRS) from ground-based facilities as well as low-resolution sp…
Constraints on atmospheric water abundance and cloud deck pressure in the warm Neptune GJ 3470 b via CARMENES transmission spectroscopy
Spandan Dash, Matteo Brogi, Siddharth Gandhi +4
Observations of cooler atmospheres of super-Earths and Neptune sized objects often show flat transmission spectra. The most likely cause of this trend is the presence of aerosols (…
JWST measurements of C, O and O in the atmosphere of super-Jupiter VHS 1256 b
Siddharth Gandhi, Sam de Regt, Ignas Snellen +4
Isotope ratios have recently been measured in the atmospheres of directly-imaged and transiting exoplanets from ground-based observations. The arrival of JWST allows us to characte…
Retrieval survey of metals in six ultra-hot Jupiters: Trends in chemistry, rain-out, ionisation and atmospheric dynamics
Siddharth Gandhi, Aurora Kesseli, Yapeng Zhang +9
Ground-based high-resolution spectroscopy (HRS) has detected numerous chemical species and atmospheric dynamics in exoplanets, most notably ultra-hot Jupiters (UHJs). However, quan…
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…
The Roasting Marshmallows Program with IGRINS on Gemini South I: Composition and Climate of the Ultra Hot Jupiter WASP-18 b
Matteo Brogi, Vanessa Emeka-Okafor, Michael R. Line +19
We present high-resolution dayside thermal emission observations of the exoplanet WASP-18b using IGRINS on Gemini South. We remove stellar and telluric signatures using standard al…
The GAPS Programme at TNG XXXIX -- Multiple molecular species in the atmosphere of the warm giant planet WASP-80 b unveiled at high resolution with GIANO-B
Ilaria Carleo, Paolo Giacobbe, Gloria Guilluy +28
Detections of molecules in the atmosphere of gas giant exoplanets allow us to investigate the physico-chemical properties of the atmospheres. Their inferred chemical composition is…
Spatially-resolving the terminator: Variation of Fe, temperature and winds in WASP-76 b across planetary limbs and orbital phase
Siddharth Gandhi, Aurora Kesseli, Ignas Snellen +5
Exoplanet atmospheres are inherently three-dimensional systems in which thermal/chemical variation and winds can strongly influence spectra. Recently, the ultra-hot Jupiter WASP-76…
Water observed in the atmosphere of τ Bootis Ab with CARMENES/CAHA
Rebecca K. Webb, Siddharth Gandhi, Matteo Brogi +4
Characterising the atmospheres of hot Jupiters is important in understanding the formation and migration of these exotic planets. However, there are still many open questions about…
A solar C/O and sub-solar metallicity in a hot Jupiter atmosphere
Michael R. Line, Matteo Brogi, Jacob L. Bean +13
Measurements of the atmospheric carbon (C) and oxygen (O) relative to hydrogen (H) in hot Jupiters (relative to their host stars) provide insight into their formation location and…
TESS and HARPS reveal two sub-Neptunes around TOI 1062
J. F. Otegi, F. Bouchy, R. Helled +46
The Transiting Exoplanet Survey Satellite (\textit{TESS}) mission was designed to perform an all-sky search of planets around bright and nearby stars. Here we report the discovery…
Five carbon- and nitrogen-bearing species in a hot giant planet's atmosphere
Paolo Giacobbe, Matteo Brogi, Siddharth Gandhi +40
The atmospheres of gaseous giant exoplanets orbiting close to their parent stars (hot Jupiters) have been probed for nearly two decades. They allow us to investigate the chemical a…
Coupled Day-Night Models of Exoplanetary Atmospheres
Siddharth Gandhi, Adam S. Jermyn
We provide a new framework to model the day side and night side atmospheres of irradiated exoplanets using 1-D radiative transfer by incorporating a self-consistent heat flux carri…
Seeing above the Clouds with High Resolution Spectroscopy
Siddharth Gandhi, Matteo Brogi, Rebecca K. Webb
In the last decade ground based high resolution Doppler spectroscopy (HRS) has detected numerous species in transiting and non-transiting hot Jupiters, and is ideally placed for at…
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…
Assessing Spectra and Thermal Inversions due to TiO in Hot Jupiter Atmospheres
Anjali A. A. Piette, Nikku Madhusudhan, Laura K. McKemmish +3
Recent detections of thermal inversions in the dayside atmospheres of some hot Jupiters are motivating new avenues to understand the interplay between their temperature structures…
H- and Dissociation in Ultra-hot Jupiters: A Retrieval Case Study of WASP-18b
Siddharth Gandhi, Nikku Madhusudhan, Avi Mandell
Atmospheres of a number of ultra-hot Jupiters (UHJs) with temperatures 2000~K have been observed recently. Many of these planets show largely featureless thermal spectra i…