I combine observations and models to understand the atmospheres of planets, exoplanets, brown dwarfs, and stars. You can download my CV here.
How do ultra-hot Jupiters vary between host stars?
We find that ultra-hot Jupiters around early-type host stars will have much larger temperature inversions compared to
planets around later-type host stars. We also futher quantify which species are heating up ultra-hot Jupiter atmospheres (Spoiler: its neutral and singly-ionized iron!). ADS
What are the atmospheres of ultra-hot Jupiters like?
Jovian planets exceeding 2000K begin to exhibit some properties only seen in stars (e.g., H- opacity). We present some of the first fully self-consistent models of these hot planets, including KELT-9b at ~4500 K. We find that inversions in these planets will be common, regardless of the presence of TiO and VO. ADS
The HST/STIS optical transmission spectrum of warm-Neptune GJ 436b.
We observed GJ 436b, a JWST GTO target, with HST/STIS. The planet's spectrum is consistent with NIR observations implying a cloudy or high metallicity atmosphere. We find an unexplained jump in the transit spectrum at 0.8 microns in the transit spectrum of several sub-Jovian exoplanets. We also measure the host stars rotation period and activity cycle. ADS
Three isotopes of CO in a M-dwarf binary indicate SNe enrichment.
In a study led by Prof. Ian Crossfield, we measured 12C16O, 13C16O, and 12C18O in GJ 745AB. The resulting isotopic ratios suggest the binary was significantly enriched by a nearby core-collapse supernovae. I constructed the stellar atmosphere models for the isotopic detections and measurements. ADS