41 citations · 57 across the 9 of their papers we have counts for
13 papers
"Mega-Earths" are likely an artifact of stellar activity
Casey L. Brinkman, Nicolas Cowan
Empirical relations and planet formation simulations suggest an upper mass limit for rocky planets of 10M, as cores above this will almost certainly undergo runawa…
Cool, Cloudy Nights on an Ultrahot Neptune: A Panchromatic NIRISS/NIRSpec Transmission Spectrum of LTT 9779 b
Sarah Stamer, Diana Dragomir, Annabella Meech +13
Studies of planets that reside in the hot Neptune desert allow us to gain insight into how their atmospheres survive the intense flux from their host stars. One such member of that…
The First Hubble Detection of a Secondary Eclipse from a Rocky Exoplanet: the 5.4-hour planet TOI-2431 b
Sebastian Zieba, Billy Edwards, Samuel N. Quinn +18
We present an HST/WFC3 G141 phase-curve observation of the ultra-short-period rocky planet TOI-2431 b and detect its secondary eclipse in the near infrared. Combined with the TESS…
Thermal Evolution of Lava Planets Across System Ages: Predictions for Hell of a Survey
Mariana Sastre, Tim Lichtenberg, Lisa Dang +22
Ultra-short-period (USP) rocky exoplanets can have dayside temperatures high enough to maintain permanent magma oceans, sitting at the intersection of interior geophysics and atmos…
The JWST weather report: Unravelling the atmospheric variability of isolated worlds using principal component analysis
Merle A. Schrader, Johanna M. Vos, Evert Nasedkin +17
Brown dwarf variability directly probes atmospheric dynamics beyond the Solar System, and recent JWST time-resolved spectroscopy has opened a new window into these processes. Princ…
Assessing Ariel's capabilities to observe free-floating brown dwarfs
Roman Akhmetshyn, Nicolas B Cowan, Sarah Casewell
The primary goal of the Ariel space telescope is to conduct the biggest spectroscopic survey of transiting exoplanets to characterize their atmospheres and weather. We propose to e…
Coupled orbital and interior structure evolution of lava planets
Mahesh Herath, Nicolas B. Cowan, Charles-Édouard Boukaré +1
Lava planets likely did not form in their current orbits, instead migrating inward via orbital decay, which influenced the evolution of their magma oceans. We introduce a coupled t…
Rock vapour is opaque: implications for dynamics and observations of lava planets
T. Giang Nguyen, Nicolas B. Cowan, Gunnar Montseny Gens +3
Extreme instellation on lava planets causes the rocky surface to melt and vaporize. Because the rock vapour composition is intrinsically tied to the mantle, atmospheric characteriz…
Heat Reveals What Clouds Conceal: Global Carbon & Longitudinally Asymmetric Chemistry on LTT 9779 b
Reza Ashtari, Sean Collins, Jared Splinter +17
LTT-9779 b is an ultra-hot Neptune (Rp ~ 4.7 Re, Mp ~ 29 Me) orbiting its Sun-like host star in just 19 hours, placing it deep within the "hot Neptune desert," where Neptunian plan…
Mapping the Cloud-Driven Atmospheric Dynamics & Chemistry of an Isolated Exoplanet Analog with Harmonic Signatures
Michael K. Plummer, Francis P. Cocchini, Peter A. Kearns +12
Young planetary-mass objects and brown dwarfs near the L/T spectral transition exhibit enhanced spectrophotometric variability over field brown dwarfs. Patchy clouds, auroral proce…
The JWST Weather Report: retrieving temperature variations, auroral heating, and static cloud coverage on SIMP-0136
Evert Nasedkin, Merle Schrader, Johanna M. Vos +15
SIMP-0136 is a T2.5 brown dwarf whose young age (~Myr) and low mass (~M) make it an ideal analogue for the directly imaged exoplanet population. With…
The JWST Weather Report from the Isolated Exoplanet Analog SIMP 0136+0933: Pressure-Dependent Variability Driven by Multiple Mechanisms
Allison M. McCarthy, Johanna M. Vos, Philip S. Muirhead +17
Isolated planetary-mass objects share their mass range with planets but do not orbit a star. They lack the necessary mass to support fusion in their cores and thermally radiate the…
Modelling the atmosphere of lava planet K2-141b: implications for low and high resolution spectroscopy
T. Giang Nguyen, Nicolas B. Cowan, Agnibha Banerjee +1
Transit searches have uncovered Earth-size planets orbiting so close to their host star that their surface should be molten, so-called lava planets. We present idealized simulation…