About Me:
I am currently a Postdoctoral Researcher at the Max Planck Institut für Astronomie in Heidelberg, Germany. I work with Dr Karin Lind on examining the chemical evolution of the Milky Way through detailed stellar abundances and high resolution spectroscopic surveys. In this effort I am involved with the APOGEE-2, Gaia-ESO, and 4 MOST surveys. I am also one of the APOGEE Science Working Group Co-Chairs.
My current projects include:
- examining variations in the age-metallicity relation across the Milky Way disk using APOGEE observations of red giant stars and Gaia DR2 parallax measurements
- providing stellar amtospheric parameters and individual elemental abundances for the Gaia-ESO Survey using Spectroscopy Made Easy (SME)
- improving spectroscopic analysis of the Ca II triplet region using full NLTE model atmospheres.
For my PhD, I worked with Dr Jon Holtzman at New Mexico State University with the SDSS III/SDSS IV APOGEE survey studying Galactic evolution through high resolution spectroscopy of stellar populations and developing methods to estimate ages of red giant stars.
Curriculum Vitae
ADS Author Query
Education:
Doctor of Philosophy (Ph.D.) in Astronomy May 2016
New Mexico State University, Las Cruces, NM
Dissertation: Ages and Abundances of Local Galactic Stellar Populations
Advisor: Dr. Jon Holtzman
Master of Science (M.S.) in Astronomy May 2014
New Mexico State University, Las Cruces, NM
Advisor: Dr. Jon Holtzman
Bachelor of Arts (B.A.) in Physics-Astronomy with Honors May 2011
Whitman College, Walla Walla, WA
Thesis: Photometry of the Galactic Globular Cluster M15
Advisor: Dr. Nathaniel Paust
Research Expertise:
I am interested in Galactic archaeology, detailed chemical abundances, stellar spectroscopy, stellar ages, radial migration, and galactic structure.
Stellar Atmospheric Parameters and Chemical Abundances using SME
I have been the main contact for the GIRAFFE analysis by the LUMBA node of the Gaia-ESO Survey for iDR5 and iDR6. I use Spectroscopy Made Easy (SME) to analyze GIRAFFE spectra (R 15000 - 35000) for atmospheric parameters and chemical abundances. For this we have integrated NLTE model atmospheres when available.
Age-resolved chemistry of the solar neighborhood
Using the age method developed in
Feuillet et al., 2016, I studied the age-abundance trends of individual elements in the solar neighborhood and compared these observations with models of Galactic chemical evolution. From this comparison, we find evidence that radial migration of stars through the Milky Way disk has a significant effect on the age-metallicity relation in the solar neighborhood. This work is detailed in
Feuillet et al., 2018.
Ages of Red Giant Stars
Using APOGEE observations of nearby red giant stars, I have developed a method of estimating ages of giants that have high resolution spectra and accurate distance measurements. This method uses probabilistic isochrone matching to determine ages to within 2 Gyr. The results of a Bayesian isochrone matching technique is then used in a hierarchical modeling technique to model the star formation history of the sample. With this method I find a strong correlation between the alpha abundance and mean age of star formation. The sample used was observed using the connection of the NMSU 1m telescope to the APOGEE instrument. This work is available as
Feuillet et al., 2016.
Optical Spectroscopy of APOGEE Stars I led a project to obtain high resolution of optical spectra of about 100 APOGEE science targets using the ARC Echelle Spectrograph on the APO 3.5m telescope. I did an optical abundance analysis of these spectra to determine atmospheric parameters and abundances of individual elements and provide verification of ASPCAP results. This work is included in
Jönsson et al, 2018.
Verification of ASPCAP Using 1m+APOGEE observations of well studied nearby stars I compared ASPCAP parameters to literature parameters from high resolution optical spectra. This is being used for verification of APOGEE survey data.
Publications:
ADS Author Query
Feuillet, D. K., Bovy, J., Holtzman, J., Weinberg, D. H., et al., 2018, MNRAS, 477, 2326, arXiv: 1803.06352
Feuillet, D. K., Bovy, J., Holtzman, J., Girardi, L., et al., 2016, ApJ, 817,
arXiv: 1511.04088
Feuillet, D. K., Paust, N. E. Q., Chaboyer, B., 2014, PASP, 126
Jönsson, H., ... Feuillet, D., et al., 2018, AJ, 156, 126
Smiljanic, R., ... Feuillet, D., et al., 2018, A&A, 617, 4
Abolfathi, B., ... Feuillet, D., et al., 2017, ApJS, 235, 42
Majewski, S. R., ... Feuillet, D., et al., 2017, AJ, 154, 94
Blanton, M. R., ... Feuillet, D., et al., 2017, AJ, 154, 28
Garcia Perez, Ana E., ... Feuillet, D., et al., 2016, AJ, 151, 144
Holtzman, J. A., ... Feuillet, D., et al., 2015, AJ, 150, 148
Alam, S., ... Feuillet, D., et al., 2015, ApJS, 219, 12
Nidever, D. L., ... Feuillet, D., et al., 2014, ApJ, 796, 38N
Hayden, M. R., ... Feuillet, D., et al., 2014, ApJ, 147, 116H
Ahn, C. P., ... Feuillet, D., et al., 2014, ApJS, 211, 17A
Eikenberry, S. S., ... Feuillet, D., et al., 2014, ApJ, 748L, 30E
Recent and Upcoming Conferences:
Chemical Evolution and Nucleosynthesis Across the Galaxy - Heidelberg, Germany,
November 2018
Lorentz Institute Workshop: Weighing Stars - Leiden, Netherlands,
November 2018
The Life and Times of the Milky Way: The symbiosis between Gaia and ground based spectroscopic surveys (intived review) - Shanghai, China,
November 2018
4MOST All Hands Meeting - Heidelberg, Germany,
September 2018
ESO Workshop: A Revolution in Stellar Physics with Gaia and Large Surveys - Warsaw, Poland,
September 2018
The Metal Poor Galaxy (invited talk) - Ringberg Castle, Germany,
July 2018
APOGEE Team Meeting - Besancon, France,
March 2018
Ages^2: taking stellar ages to the next level - Elba, Italy,
September 2017
Gaia-ESO Survey Science Meeting - Catania, Italy,
September 2017
Sloan Digital Sky Survey IV General Meeting - Santiago, Chile,
July 2018
Rediscovering our Galaxy, IAU Symposium 334 - Potsdam, Germany,
July 2017
Astrometry and Astrophysics in the Gaia sky, IAU Symposium 330 - Nice, France,
April 2017
Galactic Archaeology and Stellar Physics Conference - Canberra, Australia,
November 2016
Fellowships and Awards:
2015 NMSU Astronomy Scott Murrell Award for outstanding research and professional development.
Membership:
SDSS-III & SDSS-IV active member
Gaia-ESO Survey active member
4MOST active member
SDSS IV Committee on Inclusion in Astronomy member (2016-2017)
AAS Junior member & Chambliss Poster Award Judge
Leadership:
APOGEE Science Working Group Co-Chair
2017-2019
NMSU Astronomy Department Colloquium Committee
2015-2016
NMSU Inclusive Astronomy Group Leader
2014-2016
NMSU Astronomy Co-Head Teaching Assistant
Fall 2015
NMSU Astronomy Graduate Student Organization (AGSO) President
2014-2015
NMSU (AGSO) Secretary
2012-2014
Teaching:
Fall 2015 - Teaching Assistant Astronomy 110
Fall 2015 - Co-Head TA
Spring 2015 - TA Astronomy 110
Spring 2013 - TA Astronomy 305 Life In The Universe
Spring 2013 - Campus Observatory TA
Fall 2012 - TA Astronomy 305 Life In The Universe
Spring 2012 - TA Astronomy 110
Fall 2011 - TA Astronomy 305 Life In The Universe
Recent Outreach:
Hillrise Elementary Classroom Visit
November 2015
Relay For Life
April 2015
Las Cruces Elementary Campus Visit
April 2015
North Valley Elementary Math Night
November 2014
Chaparral Elementary Campus Visit
November 2014
Partial Solar Eclipse
October 2014
International Observe the Moon Night
September 2014
Lunar Eclipse Event
April 2014
Sierra Middle School Science Fair
February 2014
Past Research Projects:
B, V, R, I Photometry of M15 - Dr Nathaniel Paust, Whitman College 2009-2011
Microlensing events with OGLE - Dr Kailash Sahu, STScI 2010
Contact Information:
feuillet :AT: mpia :DOT: de
feuilldk :AT: gmail :DOT: com
