My research focuses on stellar populations in the Milky Way and beyond i.e. resolved stars in our own galaxy and ensemble of stars in other nearby galaxies.

Galactic Archaeology of the Milky Way


The Milky Way stellar halo


Galactic context of planet populations


Stellar populations in nearby galaxies with IFS


Dwarf galaxies

I have grown to appreciate and understand the importance of dwarf galaxies in undergrad and this research topic is still definitely one my favorites so I hope to one day get back to it! Understanding the census of dwarf galaxies around big galaxies like the Milky Way help constrain our simulations and understanding of cosmology and galaxy formation.

For the undergrad paper I led under the mentorship of Eric Bell, I characterized the dwarf galaxy dw1335-29 using VLT VIMOS images and HST photometry from the Galaxy Halos, Outer Disks, Substructure, Thick Disks, and Star Clusters survey (GHOSTS). I used the tip of the red giant branch method to confirm the dwarf galaxy’s membership to the M83 group. It’s a peculiarly star-forming and non-tidally disrupted galaxy at a 26 kpc projected distance to its host. This is weird compared to the Milky Way satellite population which is mostly quiescent for those within 100 kpc (barring the Magellanic Clouds) and has dwarf galaxies disrupted and spread across the stellar halo at distances of 30 kpc like Sagittarius.


The color-magnitude diagram of the dw1335-29 where the tip of the red giant branch is marked with the dash line (left) and the VLT/VIMOS image overlaid with the resolved stars from HST in orange and blue (right).

Collaborators and Mentors

Keith Hawkins – UT research advisor

Shardha Jogee – UT research advisor

Eric Bell –  UM research advisor and mentor

Grad student group members: Maddie Lucey, Jonathan Florez, Sydney Sherman 

Research Publications

  • “Know thy star, know thy planet: chemo-kinematically characterizing TESS host stars” [Andreia Carrillo, Keith Hawkins, Brendan Bowler. In prep, to be submitted to MNRAS by March 2019 ]
  • “The VIRUS-P Exploration of Nearby Galaxies (VENGA): Assembly History of the Bulge, Bar, and Disc of NGC 2903” [ Andreia Carrillo , Shardha Jogee, Niv Drory, Kyle Kaplan, Tim Weinzirl, Guillermo Blanc, Rongxin Luo, Mimi Song, and the VENGA Collaboration, in prep. to be submitted to MNRAS Spring 2019]
  • “Characterizing dw1335-29, a recently discovered dwarf satellite of M83”  [Andreia Carrillo, Eric Bell, Jeremy Bailin, Antonela Monachesi, Roelof S. de Jong, Benjamin Harmsen, and Colin Slater, MNRAS, 465, 5026 (2017), ]

Press and Other Publications

  • “Aiming High: Astronomy Undergraduate Education at 6,800 Feet” [Andreia Carrillo, Mercury Vol. 44 No. 4, Autumn 2015, p. 25 ]

Posters and Presentations