Xianyu Tan

@[email protected]. Planetary climatologist. Tenure-track faculty at the Tsung-Dao Lee Institute, Shanghai Jiao Tong University

[Xianyu Tan @tntfat]

@ShamiTsai I am lucky to be in these teams🙂

[Xianyu Tan @tntfat]

Took a whole hour to digest #JWSTCycle3 announcements, I am Co-I in 5 out of 20, huge congrats to the teams!

[Thaddeus Komacek @tadkomacek]

Re-posting this -- applications for this summer school are due in less than 3 weeks! Please apply at https://t.co/6BTe1xmnBd, and reach out if you have any questions.

[Jonathan Fortney @jjfplanet]

Hi everyone, I'm hiring a postdoc to work on planetary thermal evolution modeling with me at @ucsc. Topics will likely include sub-Neptunes, gas giants, and brown dwarfs.
Please apply! Deadline is Jan 22nd.
https://t.co/kIpg8nJVi7

[Vivien Parmentier @V_Parmentier]

Hey #astrotweeps, I'm hiring a great person for 3 years to work on high-resolution spectroscopy datasets and push our understanding of exo-atmospheres futher than ever. All this in beautiful Nice.
Come for the sun, stay for the science.
Details : https://t.co/kyZN0Kaq6N

[Xianyu Tan @tntfat]

H2O

[Xianyu Tan @tntfat]

Our brilliant modeler Elsie Lee has just released a new generation of substellar/giant planet general circulation models with all chemistry-cloud-radiative coupled together https://t.co/kFiPicqpnp This work is with @ShamiTsai

[Xianyu Tan @tntfat]

Showing CO variations

[Thaddeus Komacek @tadkomacek]

Applications for the 2024 UMD Brin MRC Summer School in Tracer Mixing in Fluids Across Planetary Scales are now open at https://t.co/6BTe1xmnBd! The school will take place from July 8-19, 2024 in College Park, MD. Please see https://t.co/kj1whZJLBy for more information!

[Xianyu Tan @tntfat]

We are hiring!

[Ying Zu @karmapolicedies]

We are hiring! Astronomy at SJTU consists of two branches, the SJTU Astro department and the TDLI Astro division, with research frontiers spanning from exoplanet to cosmology. https://t.co/EFKBahqKSH
https://t.co/gOatSVKmuF
https://t.co/u8rWoaBQjo
https://t.co/f6CQDe8zOL

[Ying Zu @karmapolicedies]

We are hiring! Astronomy at SJTU consists of two branches, the SJTU Astro department and the TDLI Astro division, with research frontiers spanning from exoplanet to cosmology. https://t.co/EFKBahqKSH
https://t.co/gOatSVKmuF
https://t.co/u8rWoaBQjo
https://t.co/f6CQDe8zOL

[Ryan MacDonald @MartianColonist]

𝗥𝗲𝗮𝘀𝗼𝗻𝘀 𝘁𝗼 𝗯𝗲 𝘀𝗰𝗲𝗽𝘁𝗶𝗰𝗮𝗹 𝗮𝗯𝗼𝘂𝘁 𝘁𝗵𝗲 '𝗼𝗰𝗲𝗮𝗻 𝗽𝗹𝗮𝗻𝗲𝘁 𝘄𝗶𝘁𝗵 𝗽𝗼𝘀𝘀𝗶𝗯𝗹𝗲 𝘀𝗶𝗴𝗻𝘀 𝗼𝗳 𝗹𝗶𝗳𝗲'.

The 1st JWST analysis for the planet K2-18b is out.

But many exoplanet scientists are pretty sceptical about these claims - THREAD (1/N)

[NASA Webb Telescope @NASAWebb]

The Webb telescope has detected carbon dioxide and methane in the atmosphere of exoplanet K2-18 b, a potentially habitable world over 8 times bigger than Earth. Webb’s data suggests the planet might be covered in ocean, with a hydrogen-rich atmosphere: https://t.co/qN1SqCfFt1

[Xianyu Tan @tntfat]

@johannamvos @tcddublin Huge congrats Johanna!!

[Jasmine 🌌🔭 @astro_jaz]

we finally have JWST images of all of the gas giants!!!

[Xianyu Tan @tntfat]

@michaelbattalio Thank you for your interest in our work!

[Xianyu Tan @tntfat]

Our 3D models suggest that the so-called quenching (chemical disequilibrium driven by vertical motions) is typical even in stratified atmospheres for a wide range of brown dwarfs. This has been shown in previous 1D models with ad-hoc ways of dealing with turbulences.

[Xianyu Tan @tntfat]

Modeling chemical reactions in planetary atmospheres is difficult, and is more so in three-dimensional dynamical models. We take a step forward in brown dwarf and giant planet global models in our latest paper https://t.co/8DFK3MuUqn. Lead author E. Lee (who is not on Twitter)

[Xianyu Tan @tntfat]

The good news from our study is that one-dimensional chemical kinetic models should be doing well in brown dwarf conditions. Of course, if one is concerned about the time variability (due to the rotation of the objects) and their chemical signatures, one should seek 3D models.