I am a third-year graduate student at MPIA. I have a physics background and am generally working on interstellar medium, dust extinction, and machine learning
Education:
2021-present, Graduate student @ MPIA
2021, Bachelor's degree of Natural Science @ Dep. of Physics, THU
Research Interests:
Interstellar medium |
3D dust maps of MW |
Stellar parameters from low-resolution spectroscopy |
Gaia
I come from Baotou, "the city of deers". Besides astronomy, I like spending all day at history museums learning random facts that are fun, such as:
This is how astronomers in 16th century measured RA and DEC.
(Shot by me in the Ancient Observatory, Beijing)
Thanks for your 648 like(s)!
Research
Parameters of 220 million stars from Gaia BP/RP spectra
Gaia DR3 contains low-resolution XP spectra of over 220 million stars, giving a unique opportunity to measure dust extinction and its vatiation in 3D.
We build a forward model that maps (Teff, [Fe/H], logg) to Gaia XP, and ultilize this model to determine the stellar types, extinction and distances for all 220 million Gaia XP stars.
For more details, please take a look at
our paper.
Variation of dust extinction in the milky way
The variation of dust extinction is modelled by the parmeter Rv = A(V)/E(B-V) , which is determined by the size distribution and chemical composition of the interstellar dust. Dust Rv is an also important tracer of local physical and chemical environment, such as SNe, star formation and molecular clouds.
Ultilizing Gaia XP spectra, we determine Rv for ~ 130 million high-extinction stars, which would be one of the largest Rv catalog up to 2024. This paper is under review, arXiv:2407.14594
Physical explanation of R(V)
We discover exciting correlation of Rv and are currently working on explaining them.
Talks
(Title, Type, Time, Link & Place)
1. Variation of extrinction curces from PS1, 2MASS, WISE \& Gaia | Interstellar Institute, July 2022 @ Institut Pascal , Saclay
2. Stellar parameters of 220 million stars from Gaia XP spectra | MPIA Science day, December 2022 @ MPIA, Heidelberg
3. Stellar parameters from Gaia XP spectra using a forward model | Gaia XPloration, May 2023 @ IoA, Cambridge
4. A 3D Rv map based on Gaia XP spectra | August 2023 @ DoA, Tsinghua University, Beijing
5. Inferred stellar parameters from 220 million XP spectra using an empirical forward model | NAOC Seminar, August 2023
@ NAOC, Beijing
6. Inferred stellar parameters from 220 million XP spectra using an empirical forward model | KIAA Seminar, August 2023 @ KIAA, PKU, Beijing
