Position Description

The Academia Sinica Institute of Astronomy and Astrophysics (ASIAA) invites applications to two postdoctoral research positions in cosmology and exoplanet science, working with Dr. Tomomi Sunayama and Dr. Shang-Min Tsai, respectively. The initial appointment for both positions is for two years, with flexible start date in 2026 and possible extension for two more years depending on performance. Candidates are expected to have completed their PhD by the start of the appointment. The primary responsibilities for each position are listed below:

Postdoctoral associate in cosmology:

We invite applications for a Postdoctoral Researcher to work with Dr. Tomomi Sunayama in observational cosmology. The position will focus on exploiting data from the Subaru Hyper Suprime-Cam (HSC) survey, the Subaru Prime Focus Spectrograph (PFS), the Rubin Observatory LSST, and the Roman Space Telescope High Latitude Survey, all of which ASIAA is deeply involved in.

The successful applicant will work on developing and applying advanced analysis methods for these datasets across multiple surveys. Possible research directions include (but are not limited to):

•              Joint analysis of cluster abundance, weak gravitational lensing and clustering from HSC, LSST, and Roman

•              Development of cosmological simulations incorporating primordial non-Gaussianity (PNG)

•              Construction of cosmological emulators for cluster observables, including systematics

•              Synergies between cluster cosmology, galaxy clustering, and lensing signals across multiple surveys, including HSC, LSST, Roman, and PFS

The postdoc will work in close collaboration with the broader cosmology community at partner institutions, including teams engaged in HSC Weak Lensing, PFS Cosmology, LSST DESC, and the Roman High Latitude Survey.

The ideal candidate will have experience in weak gravitational lensing, galaxy clusters, or large-scale structure. Experience with cosmological simulations and machine learning is highly desirable.

Postdoctoral associate in exoplanet atmospheres:

We invite applications for a Postdoctoral Associate position to work with Dr. Shang-Min Tsai on exoplanet atmospheres.

We are seeking a highly motivated researcher conducting both collaborative and independent research. The research projects will focus on, but are not limited to

i) identifying diagnostic signatures of sub-Neptunes and rocky planets
ii) improving current atmospheric retrieval framework, and

iii) exploring observable features and asymmetries induced by global circulation and orbital dynamics

We are particularly interested in candidates with experience in the following areas:

• High-resolution spectroscopic analysis

• Atmospheric retrieval techniques

• 3D general circulation models (GCMs) and sub-grid model development

• Planetary interiors and evolution related to volatiles cycling

The postdoctoral associate will also have opportunities to participate in preparatory programs for ELT/METIS, ARIEL, and several JWST collaborations. The annually funded summer program at ASIAA additionally offers opportunities for joint student projects and supervision experience.

ASIAA is an institute of Academia Sinica, the leading national research organization of Taiwan. ASIAA has access to the Twin Magellan Telescopes and the Subaru Telescope, and participates in the construction of METIS -- the first-light instrument of the ELT -- and is a partner of the Giant Magellan Telescope. More information on these programs and facilities is available on our homepage.

Compensation and Benefits

Compensation Type: Salary scales based on central government’s framework

Benefits: Including health insurance and travel allowance

Application Details

Materials required:

A cover letter describing the applicant’s interest.

A curriculum vitae.
A statement connecting past research to your plans for this position (3 pages maximum).
Arrange two reference letters sent directly to

tsunayama@asiaa.sinica.edu.tw for the cosmology position
smtsai@asiaa.sinica.edu.tw for the exoplanet position

For full consideration, please submit the application by February 6, 2026.