Hi and Welcome!

I'm Dr. Rana Ezzeddine

I'm an Astronomer studying stars and their chemical compositions, to interpret the origin and evolution of the chemical elements in the Galaxy and the Universe.

Im currently a JINA_CEE/MSU postdoctoral fellow residing at MIT, in Cambridge MA, USA.
Starting January 2020, I will be an assistant professor in the Astronomy Department at the University of Florida in Gainesville, FL.

Please Click here for a PDF link to my CV.

contact email : ranae@mit.edu

My scientific research covers a range of topics in stellar astrophysics. I am primarily interested in observing
and interpreting the chemical properties and signatures of stars to decipher the observational evidence of early star formation, the origin and evolution of stellar populations, the chemical enrichment events that lead
to the present-day abundance distribution of elements via chemical evolution of the Galaxy.

I am an expert in observing, analyzing and modeling the atmospheres of stars.
I am a core member of the R-process Alliance (RPA) and the Joint Institute for Nuclear Astrophysics - Center for the Evolution of Elements (JINA_CEE) collaborations.

Below are some of the research projects I've been involved with,
or I'm currently working on:

Non-LTE abundance precision

Chemical abundance determination in Non-Local Thermodynamic Equilibrium (Non-LTE) precision for important elements including Fe, Na, Mg, Al, Ca, as well as others.

R-process stars

Building up a large sample of Galactic r-process stars which hold the key to understanding heavy element production.

Chemical Evolution of the Galaxy

Building a firm connection between the current predictions by chemical evolution models and the observational evidence supplied by the stars.

Dwarf Galaxies

Establishing connections of the r-process signatures observed in the the Galactic halo and ultra-faint dwarf (UFD) galaxies.

Peer reviewed publications

2019


18- Chahrour F., Ezzeddine R., et al. in prep. "Revisiting multiple populations in globular clusters with NLTE abundances"
17- Ezzeddine, R., Ji A. P. et al. in prep. "Constraining spectroscopic gravities using Gaia benchmark stars"
16- Ezzeddine, R., Rasmussen K. et al. 2019, in prep.
"The R-Process Alliance : Magellan/MIKE data release from the Southern search for r-process enhanced stars in the Galactic Halo"
15- Ezzeddine, R., Frebel A. et al. 2019, ApJ accepted, in press "Signatures of an Aspherical Supernova explosion preserved in a hyper metal-poor star'"
14- Sitnova T., Mashonkina L., Ezzeddine, R., Frebel A. 2019, MNRAS accepted
"Ultra metal-poor stars: improved atmospheric parameters and NLTE abundances of magnesium and calcium"
13- Sakari C., Roederer I., Placco V., Beers T., Ezzeddine, R. et al. 2019, ApJ accepted
"The R-Process Alliance : Discovery of a low alpha, r-process enhanced metal-poor star in the Galactic halo"

2018

12- Placco V. M et al. including Ezzeddine, R. 2018, ApJ, 870. 122P
"The R-Process Alliance: Spectroscopic Follow-up of 857 Low-Metallicity Star Candidates from the Best & Brightest Survey"
11- Frebel A., Ji, A., Ezzeddine, R., et al. 2018, ApJ, 871, 146F
"Chemical abundance Signature of J0023+0307 -- A Second-Generation Main-Sequence Star with [Fe/H]<-6"
10- Sakari C., Placco V., Farrell E., Roederer I., Wallerstein G., Beers T., Ezzeddine, R. et al. 2018, ApJ, 868, 110S
"The R-Process Alliance: First Release from the Northern Search for r-Process Enhanced Metal-Poor Stars in the Galactic Halo"
9- Ezzeddine, R., Merle T., Plez, B. et al. 2018, A&A, 618, A141 "An empirical recipe for inelastic hydrogen-atom collisions in non-LTE calculations"
8- Roederer I., Sakari C., Placco, V., Beers, T., Ezzeddine, R. at al. 2018, ApJ, 865, 129R
"The R-Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-Poor Star with an Extreme R-Process Enhancement of [Eu/H]=-0.14"
7- Cain M., Frebel A., Gull M., Ji A., Placco V., Beers T., Meléndez J., Ezzeddine, R., et al. 2018, ApJ, 864, 43C
"The R-Process Alliance: Chemical Abundances for a Trio of r-process-enhanced Stars—One Strong, One Moderate, and One Mild"
6- Gull, M., Frebel A., Cain M., Placco V., Ji A., Abate C., Ezzeddine, R. et al. 2018, ApJ, 862, 174G
"The R-Process Alliance: Discovery of the First Metal-poor Star with a Combined r- and s-process Element Signature"
5- Ezzeddine, R. & Frebel A., 2018, ApJ, 863, 168E "Revisiting the Iron Abundance in the Hyper Iron-poor Star HE1327–2326 with UV COS/HST Data"

2017

4- Ezzeddine, R., Frebel A. and Plez B., 2017, ApJ, 847, 142E
"Ultra-metal-poor Stars: Spectroscopic Determination of Stellar Atmospheric Parameters Using Iron Non-LTE Line Abundances"
3- Placco V., Holmbeck E., Frebel A., Beers T., Surman R., Ji A., Ezzeddine, R. et al. 2017, ApJ, 844, 18P
"RAVE J203843.2-002333: The First Highly R-process-enhanced Star Identified in the RAVE Survey"
2- Ji A., Frebel A., Ezzeddine, R. & A. Casey, 2017, ApJ, 832L, 3J "Chemical Diversity in the Ultra-faint Dwarf Galaxy Tucana II"

2016

1- Ezzeddine, R., Merle T. and Plez B., 2016, AN, 337, 850E "Non-LTE iron abundances in cool stars: The role of hydrogen collisions"

Proceeding publications

4- Aprahamian A. et al. including Ezzeddine, R., 2018 Proceedings for the FRIB Theory Alliance workshop, arXiv:1809.00703 "FRIB and the GW170817 kilonova"
3- Ezzeddine, R., Sitnova T., Frebel A., Mashonkina L., Plez B., 2018, IAU symposium 334 Conference proceeding, 259E
"Mega (metal-poor) not so much: Non-LTE spectroscopic stellar parameters and abundance determination of Ultra metal-poor stars"
2- Ezzeddine, R., Merle T. & Plez B., 2013, EAS conference proceedings, 63, 407E New Advances in Stellar Physics: From Microscopic To Macroscopic Processes
"NLTE Iron abundance determination in Red Giants"
1- Ezzeddine, R., Merle T., Plez B., 2013, Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, 119E
“Non-LTE Iron abundance determination of a sample of Kepler Red Giants”

My outreach work involves engaging and communicating science to the public by leading and organizing science festivals,public talks and events, speaking for public audiences about topics related to my research work and astronomy, and promoting an equiatable science culture to the public and colleague scientists. Below are some of the outreach events I've organized or participated in.

Teaching ... Coming Soon.