Xianyu Tan
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View article: Characterizing the Time Variability of 2M1207 A + b with JWST NIRSpec/PRISM
Characterizing the Time Variability of 2M1207 A + b with JWST NIRSpec/PRISM Open
We present JWST NIRSpec/PRISM integral field unit time-resolved observations of 2M1207 A and b (TWA 27), an ∼10 Myr binary system consisting of an ∼2500 K substellar primary hosting an ∼1300 K companion. Our data provide 20 time-resolved s…
View article: Horizontal and vertical exoplanet thermal structure from a JWST spectroscopic eclipse map
Horizontal and vertical exoplanet thermal structure from a JWST spectroscopic eclipse map Open
Highly irradiated giant exoplanets known ‘ultrahot Jupiters’ are anticipated to exhibit large variations of atmospheric temperature and chemistry as a function of longitude, latitude and altitude. Previous observations have hinted at these…
View article: Sensitivity to Sub-Io-sized Exosatellite Transits in the MIRI LRS Light Curve of the Nearest Substellar Worlds
Sensitivity to Sub-Io-sized Exosatellite Transits in the MIRI LRS Light Curve of the Nearest Substellar Worlds Open
JWST’s unprecedented sensitivity enables precise spectrophotometric monitoring of substellar worlds, revealing atmospheric variability driven by mechanisms operating across different pressure levels. This same precision now permits excepti…
View article: How clear are the skies of WASP-80b?: 3D Cloud feedback on the atmosphere and spectra of the warm Jupiter
How clear are the skies of WASP-80b?: 3D Cloud feedback on the atmosphere and spectra of the warm Jupiter Open
Close-in warm Jupiters orbiting M-dwarf stars are expected to exhibit diverse atmospheric chemistry, with clouds playing a key role in shaping their albedo, heat distribution, and spectral properties. We study WASP-80b, a warm Jupiter orbi…
View article: The JWST weather report: Retrieving temperature variations, auroral heating, and static cloud coverage on SIMP-0136
The JWST weather report: Retrieving temperature variations, auroral heating, and static cloud coverage on SIMP-0136 Open
SIMP-0136 is a T2.5 brown dwarf whose young age (200 ± 50 Myr) and low mass (15 ± 3 M Jup ) make it an ideal analogue for the directly imaged exoplanet population. With a 2.4 hour period, it is known to be variable in both the infrared (IR…
View article: Revealing patchy clouds on WASP-43b and WASP-121b through coupled microphysical and hydrodynamical models
Revealing patchy clouds on WASP-43b and WASP-121b through coupled microphysical and hydrodynamical models Open
Hot and ultra-hot Jupiters are currently the best observational targets to study the effects of clouds on exoplanet atmospheres. Observations have reported westward optical phase curve offsets, weak spectral features, and nightside tempera…
View article: The impact of cloud microphysics on the atmospheric dynamics of hot Jupiters
The impact of cloud microphysics on the atmospheric dynamics of hot Jupiters Open
Recent JWST transmission and emission spectroscopic observation of hot Jupiters have demonstrated that mineral clouds are likely common in hot Jupiter atmospheres. These mineral clouds have long been predicted to form and persist on the ni…
View article: Time-resolved absorption of six chemical species with MAROON-X points to a strong drag in the ultra-hot Jupiter TOI-1518 b
Time-resolved absorption of six chemical species with MAROON-X points to a strong drag in the ultra-hot Jupiter TOI-1518 b Open
Context . Wind dynamics play a pivotal role in governing transport processes within planetary atmospheres, influencing atmospheric chemistry, cloud formation, and the overall energy budget. Understanding the strength and patterns of winds …
View article: Irradiated Atmospheres. III. Radiative-convective-mixing Equilibrium for Nongray Picket-fence Model
Irradiated Atmospheres. III. Radiative-convective-mixing Equilibrium for Nongray Picket-fence Model Open
The nongray picket-fence model predicts more accurately the temperatures in low-density regions compared to semigray models. This study investigates how the vertical-mixing and convection fluxes modify the picket-fence model. The usual rad…
View article: Asymmetry and Dynamical Constraints in Two-limbs Retrieval of WASP-39 b Inferring from JWST Data
Asymmetry and Dynamical Constraints in Two-limbs Retrieval of WASP-39 b Inferring from JWST Data Open
Transmission spectroscopy has provided unprecedented insight into the makeup of exoplanet atmospheres. A transmission spectrum contains contributions from a planet’s morning and evening limbs, which can differ in temperature, composition, …
View article: The <i>JWST</i> weather report from the nearest brown dwarfs II: consistent variability mechanisms over 7 months revealed by 1–14 μm NIRSpec + MIRI monitoring of WISE 1049AB
The <i>JWST</i> weather report from the nearest brown dwarfs II: consistent variability mechanisms over 7 months revealed by 1–14 μm NIRSpec + MIRI monitoring of WISE 1049AB Open
We present a new epoch of JWST spectroscopic variability monitoring of the benchmark binary brown dwarf WISE 1049AB, the closest, brightest brown dwarfs known. Our 8-h JWST/MIRI low resolution spectroscopy and 7-h JWST/NIRSpec prism observ…
View article: The JWST weather report from the nearest brown dwarfs II: Consistent variability mechanisms over 7 months revealed by 1-14 $μ$m NIRSpec + MIRI monitoring of WISE 1049AB
The JWST weather report from the nearest brown dwarfs II: Consistent variability mechanisms over 7 months revealed by 1-14 $μ$m NIRSpec + MIRI monitoring of WISE 1049AB Open
We present a new epoch of JWST spectroscopic variability monitoring of the benchmark binary brown dwarf WISE 1049AB, the closest, brightest brown dwarfs known. Our 8-hour MIRI low resolution spectroscopy (LRS) and 7-hour NIRSpec prism obse…
View article: Irradiated Atmospheres. II. Interplay between Scattering and Vertical-mixing-induced Energy Transport
Irradiated Atmospheres. II. Interplay between Scattering and Vertical-mixing-induced Energy Transport Open
Scattering is crucial for the atmospheric thermal profiles. The energy transport by vertical mixing plays an essential role in the greenhouse or anti-greenhouse effect. This work explores the interaction between scattering and vertical mix…
View article: Irradiated Atmospheres III : Radiative-Convective-Mixing Equilibrium for Non-Grey Picket-Fence Model
Irradiated Atmospheres III : Radiative-Convective-Mixing Equilibrium for Non-Grey Picket-Fence Model Open
The non-grey picket-fence model predicts more accurately the temperatures in low-density regions compared to semi-grey models. This study investigates how the vertical mixing and convection fluxes modify the picket-fence model. The usual r…
View article: The JWST Weather Report from the Isolated Exoplanet Analog SIMP 0136+0933: Pressure-dependent Variability Driven by Multiple Mechanisms
The JWST Weather Report from the Isolated Exoplanet Analog SIMP 0136+0933: Pressure-dependent Variability Driven by Multiple Mechanisms Open
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 their heat from formation as they cool, primarily at infrared …
View article: Phase-resolved Hubble Space Telescope WFC3 Spectroscopy of the Weakly Irradiated Brown Dwarf GD 1400 and Energy Redistribution–Irradiation Trends in Six White Dwarf–Brown Dwarf Binaries
Phase-resolved Hubble Space Telescope WFC3 Spectroscopy of the Weakly Irradiated Brown Dwarf GD 1400 and Energy Redistribution–Irradiation Trends in Six White Dwarf–Brown Dwarf Binaries Open
Irradiated brown dwarfs offer a unique opportunity to bridge the gap between stellar and planetary atmospheres. We present high-quality Hubble Space Telescope/Wide Field Camera 3/G141 phase-resolved spectra of the white dwarf–brown dwarf b…
View article: Irradiated Atmospheres. I. Heating by Vertical-mixing-induced Energy Transport
Irradiated Atmospheres. I. Heating by Vertical-mixing-induced Energy Transport Open
Observations have revealed unique temperature profiles in hot Jupiter atmospheres. We propose that the energy transport by vertical mixing could lead to such thermal features. In our new scenario, strong absorbers, TiO, and VO are not nece…
View article: Time Resolved Absorption of Six Chemical Species With MAROON-X Points to Strong Drag in the Ultra Hot Jupiter TOI-1518 b
Time Resolved Absorption of Six Chemical Species With MAROON-X Points to Strong Drag in the Ultra Hot Jupiter TOI-1518 b Open
Wind dynamics play a pivotal role in governing transport processes within planetary atmospheres, influencing atmospheric chemistry, cloud formation, and the overall energy budget. Understanding the strength and patterns of winds is crucial…
View article: The JWST Weather Report from the Isolated Exoplanet Analog SIMP 0136+0933: Pressure-Dependent Variability Driven by Multiple Mechanisms
The JWST Weather Report from the Isolated Exoplanet Analog SIMP 0136+0933: Pressure-Dependent Variability Driven by Multiple Mechanisms Open
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 their heat from formation as they cool, primarily at infrared …
View article: Irradiated Atmospheres I: Heating by Vertical-Mixing Induced Energy Transport
Irradiated Atmospheres I: Heating by Vertical-Mixing Induced Energy Transport Open
Observations have revealed unique temperature profiles in hot Jupiter atmospheres. We propose that the energy transport by vertical mixing could lead to such thermal features. In our new scenario, strong absorbers, TiO and VO are not neces…
View article: The only inflated brown dwarf in an eclipsing white dwarf–brown dwarf binary: WD1032+011B
The only inflated brown dwarf in an eclipsing white dwarf–brown dwarf binary: WD1032+011B Open
Due to their short orbital periods and relatively high flux ratios, irradiated brown dwarfs in binaries with white dwarfs offer better opportunities to study irradiated atmospheres than hot Jupiters, which have lower planet-to-star flux ra…
View article: The only inflated brown dwarf in an eclipsing white dwarf-brown dwarf binary: WD1032+011B
The only inflated brown dwarf in an eclipsing white dwarf-brown dwarf binary: WD1032+011B Open
Due to their short orbital periods and relatively high flux ratios, irradiated brown dwarfs in binaries with white dwarfs offer better opportunities to study irradiated atmospheres than hot Jupiters, which have lower planet-to-star flux ra…
View article: Global weather map reveals persistent top-of-atmosphere features on the nearest brown dwarfs
Global weather map reveals persistent top-of-atmosphere features on the nearest brown dwarfs Open
Brown dwarfs and planetary-mass companions display rotationally modulated photometric variability, especially those near the L/T transition. This variability is commonly attributed to top-of-atmosphere (TOA) inhomogeneities, with proposed …
View article: Evidence for Nightside Water Emission Found in Transit of Ultra-hot Jupiter WASP-33 b
Evidence for Nightside Water Emission Found in Transit of Ultra-hot Jupiter WASP-33 b Open
To date, the dayside thermal structure of ultra-hot Jupiters (UHJs) is generally considered to be inverted, but their nightside thermal structure has been less explored. Here, we explore the impact of nightside thermal emission on high-res…
View article: Phase-resolving the Absorption Signatures of Water and Carbon Monoxide in the Atmosphere of the Ultra-hot Jupiter WASP-121b with GEMINI-S/IGRINS
Phase-resolving the Absorption Signatures of Water and Carbon Monoxide in the Atmosphere of the Ultra-hot Jupiter WASP-121b with GEMINI-S/IGRINS Open
Ultra-hot Jupiters (UHJs) are among the best targets for atmospheric characterization at high spectral resolution. Resolving their transmission spectra as a function of orbital phase offers a unique window into the 3D nature of these objec…
View article: Evidence for Nightside Water Emission Found in Transit of Ultrahot Jupiter WASP-33b
Evidence for Nightside Water Emission Found in Transit of Ultrahot Jupiter WASP-33b Open
To date, the dayside thermal structure of ultrahot Jupiters (UHJs) is generally considered to be inverted, but their nightside thermal structure has been less explored. Here we explore the impact of nightside thermal emission on high-resol…
View article: The <i>JWST</i> weather report from the nearest brown dwarfs I: multiperiod <i>JWST</i> NIRSpec + MIRI monitoring of the benchmark binary brown dwarf WISE 1049AB
The <i>JWST</i> weather report from the nearest brown dwarfs I: multiperiod <i>JWST</i> NIRSpec + MIRI monitoring of the benchmark binary brown dwarf WISE 1049AB Open
We report results from 8 h of JWST/MIRI low resolution spectroscopic (LRS) monitoring directly followed by 7 h of JWST/NIRSpec prism spectroscopic monitoring of the benchmark binary brown dwarf WISE 1049AB, the closest, brightest brown dwa…
View article: Direct detectability of tidally heated exomoons by photometric orbital modulation
Direct detectability of tidally heated exomoons by photometric orbital modulation Open
Aims. We investigate whether volcanic exomoons can be detected in thermal wavelength light curves due to their phase variability along their orbit. The method we use is based on the photometric signal variability that volcanic features or …
View article: Phase-resolving the absorption signatures of water and carbon monoxide in the atmosphere of the ultra-hot Jupiter WASP-121b with GEMINI-S/IGRINS
Phase-resolving the absorption signatures of water and carbon monoxide in the atmosphere of the ultra-hot Jupiter WASP-121b with GEMINI-S/IGRINS Open
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 offers a unique window into the 3D nature of these objects. In …
View article: Correction to: 3D simulations of photochemical hazes in the atmosphere of hot Jupiter HD 189733b
Correction to: 3D simulations of photochemical hazes in the atmosphere of hot Jupiter HD 189733b Open