About Me

Hello everyone and welcome to my personal webpage. I am Julien Drevon, and working for the European Southern Observatory (ESO) with a Fellow astronomer position since November 1st 2023.

Born the 2nd of November 1997 in Cannes (France), I have made my bachelor degrees and my master degree at the Universite Cote d'Azur at Nice (France). In October 2023, I obtained my PhD thesis under the supervision of Pierre CRUZALEBES and Florentin MILLOUR with the title: "Exploitation of the VLTI/MATISSE instrument: imagery of evolved stars." In addition to all the stellar evolution theory skills that I have learned during my PhD, I also dealed with interferometric data using the VLTI/MATISSE instrument to understand how to use them in order to locate the molecular and dust formation regions in the vicinity of evolved stars.

During my 2nd year of my PhD, I have been granted a studentship position at ESO Chile under the supervision of Claudia Paladini to develop new skills on stellar wind and dust formation around AGB stars.

After my PhD I moved to ESO-Chile for a reasearch fellowship position with duties as night astronomer (80 nights per year) at the Paranal Observatory for VLTI. In addition to my night astronomer position, I am also instrument fellow for the VLTI/MATISSE instrument and working on instrumental projects for the observatory. Recently I coded a new quality check script for the VLTI/MATISSE instrument to improve the robusteness of the grading procedure.

All of my skills can be divided into four different categories: i) current theoretical knowledge on stellar evolution and dust formation around evolved stars, ii) knowledge of infrared interferometric instruments, iii) calibration, processing, and analysis of interferometric data, and iv) programming and the creation of new codes for processing and analyzing interferometric data. My skills are currently being used to analyze data from the VLTI instruments and reconstruct images of structures located at the surface and in the close environments (a few stellar radii) within the molecular and dust envelopes of evolved stars. My goal is to identify the conditions and regions of dust and molecule formation to better constrain the mass-loss phenomenon and improve our understanding of the dust formation process.

Scientific keywords: evolved stars, AGB, red supergiants, dust formation, stellar wind, molecules, convection cells, photosphere, circumstellar envelope.

Technical keywords: infrared, interferometry, VLTI, image reconstruction, machine learning, big data, coding, Python, statistics, photometry, spectroscopy.

Publications

Please find below all my first author publications and the one in which I have been evolved in

First author publications

2024

Drevon, J. ; Millour, F. ; Cruzalebes, P. ; Paladini, C. ; Scicluna, P. ; Matter, A. ; Chiavassa, A.; Montarges, M. ; Cannon, E. ; Allouche, F. ; Hofmann, K. -H. ; Lagarde, S. ; Lopez, B. ; Meilland, A. ; Petrov, R. ; Robbe-Dubois, S. ; Schertl, D. ; Zins, G. ; Abraham, P. ; Berio, P. ; Henning, Th ; Hron, J. ; Isbell, J. W. ; Jaffe, W. ; Labadie, L. ; Varga, J. ; Weigelt, G. ; Woillez, J. ; van Boekel, R. ; Pantin, E. ; Danchi, W. C. ; de Koter, A. ; Gamez-Rosas, V. ; Hogerheijde, M. R. ; Leftley, J. ; Stee, P. ; Waters, R. -- "Images of Betelgeuse with VLTI/MATISSE across the Great Dimming" (A&A)

2022

Drevon, J. ; Millour, F. ; Cruzalebes, P. ; Paladini, C. ; Scicluna, P. -- "RHAPSODY: Reconstructing Hankel rAdial Profiles in centro-Symmetric Objects with Discrete rings for astrophYsics" (SPIE)

2022

Drevon, J. ; Millour, F. ; Cruzalebes, P. ; Paladini, C. ; Hron, J. ; Meilland, A. ; Allouche, F. ; Hofmann, K. -H. ; Lagarde, S. ; Lopez, B. ; Matter, A. ; Petrov, R.; Robbe-Dubois, S. ; Schertl, D. ; Scicluna, P. ; Wittkowski, M. ; Zins, G. ; Abraham, P. ; Antonelli, P. ; Beckmann, U. ; Berio, P. ; Bettonvil, F. ; Glindemann, A. ; Graser, U. ; Heininger, M. ; Henning, Th. ; Isbell, J. W. ; Jaffe, W. ; Labadie, L. ; Leinert, C. ; Lehmitz, M. ; Morel, S. ; Meisenheimer, K. ; Soulain, A. ; Varga, J. ; Weigelt, G. ; Woillez, J. ; Augereau, J. -C. ; van Boekel, R. ; Burtscher, L. ; Danchi, W. C. ; Dominik, C. ; Gamez Rosas, V. ; Hocde, V. ; Hogerheijde, M. R. ; Klarmann, L. ; Kokoulina, E. ; Leftley, J. ; Stee, P. ; Vakili, F. ; Waters, R. ; Wolf, S. ; Yoffe, G. -- "Locating dust and molecules in the inner circumstellar environment of R Sculptoris with MATISSE" (A&A)

Co-author publications

2024

Planquart, L.; Paladini, C.; Jorissen, A.; Escorza, A. ; Pantin, E. ; Drevon, J. ; Aringer, B. ; Baron, F. ; Chiavassa, A.; Cruzalebes, P. ; Danchi, W.; De Beck, E. ; Groenewegen, M. A. T. ; Hofner, S. ; Hron, J. ; Khouri, T. ; Lopez, B. ; Lykou, F.; Montarges, M.; Nardetto, N. ; Ohnaka, K. ; Olofsson, H.; Rau, G. ; Rosales-Guzman, A.; Sanchez-Bermudez, J.; Scicluna, P. ; Siess, L.; Thevenin, F. ; Van Eck, S.; Vlemmings, W. H. T. ; Weigelt, G. ; Wittkowski, M.-- "An impressionist view of V Hydrae. When MATISSE paints asymmetric giant blobs" (A&A)

2023

Cannon, E. ; Montarges, M. ; de Koter, A. ; Matter, A. ; Sanchez-Bermudez, J. ; Norris, R. ; Paladini, C. ; Decin, L. ; Sana, H. ; Sundqvist, J. O. ; Lagadec, E. ; Kervella, P. ; Chiavassa, A. ; Dupree, A. K. ; Perrin, G. ; Scicluna, P. ; Stee, P. ; Kraus, S. ; Danchi, W. ; Lopez, B. ; Millour, F. ; Drevon, J. ; Cruzalebes, P. ; Berio, P. ; Robbe-Dubois, S. ; Rosales-Guzman, A. -- "The dusty circumstellar environment of Betelgeuse during the Great Dimming as seen by VLTI/MATISSE" (A&A)

2022

Sanchez-Bermudez, J. ; Merand, A.; Sallum, S. ; Drevon, J. ; Kluska, J. ; Millour, F. ; Vermot, P. ; Young, J. -- "Optical interferometry imaging contest IX" (SPIE)

2022

Lopez, B. ; Lagarde, S. ; Petrov, R. G.; Jaffe, W. ; Antonelli, P. ; Allouche, F. ; Berio, P. ; Matter, A. ; Meilland, A. ; Millour, F. ; Robbe-Dubois, S. ; Henning, Th. ; Weigelt, G. ; Glindemann, A. ; Agocs, T. ; Bailet, Ch. ; Beckmann, U. ; Bettonvil, F. ; van Boekel, R. ; Bourget, P. ; Bresson, Y. ; Bristow, P. ; Cruzalebes, P. ; Eldswijk, E. ; Fantei Caujolle, Y. ; Gonzalez Herrera, J. C. ; Graser, U. ; Guajardo, P. ; Heininger, M. ; Hofmann, K. -H. ; Kroes, G. ; Laun, W. ; Lehmitz, M. ; Leinert, C. ; Meisenheimer, K. ; Morel, S. ; Neumann, U. ; Paladini, C. ; Percheron, I. ; Riquelme, M. ; Schoeller, M. ; Stee, Ph. ; Venema, L. ; Woillez, J. ; Zins, G. ; Abraham, P. ; Abadie, S. ; Abuter, R. ; Accardo, M. ; Adler, T. ; Alonso, J. ; Augereau, J. -C. ; Bohm, A. ; Bazin, G. ; Beltran, J. ; Bensberg, A. ; Boland, W. ; Brast, R. ; Burtscher, L. ; Castillo, R. ; Chelli, A. ; Cid, C. ; Clausse, J. -M. ; Connot, C. ; Conzelmann, R. D. ; Danchi, W. -C. ; Delbo, M. ; Drevon, J. ; Dominik, C. ; van Duin, A. ; Ebert, M. ; Eisenhauer, F. ; Flament, S. ; Frahm, R. ; Gamez Rosas, V. ; Gabasch, A. ; Gallenne, A. ; Garces, E. ; Girard, P. ; Glazenborg, A. ; Gonte, F. Y. J. ; Guitton, F. ; de Haan, M. ; Hanenburg, H. ; Haubois, X. ; Hocde, V. ; Hogerheijde, M. ; ter Horst, R. ; Hron, J. ; Hummel, C. A. ; Hubin, N. ; Huerta, R. ; Idserda, J. ; Isbell, J. W. ; Ives, D. ; Jakob, G. ; Jasko, A. ; Jochum, L. ; Klarmann, L. ; Klein, R. ; Kragt, J. ; Kuindersma, S. ; Kokoulina, E. ; Labadie, L. ; Lacour, S. ; Leftley, J. ; Le Poole, R. ; Lizon, J. -L. ; Lopez, M. ; Lykou, F. ; Merand, A. ; Marcotto, A. ; Mauclert, N. ; Maurer, T. ; Mehrgan, L. H. ; Meisner, J. ; Meixner, K. ; Mellein, M. ; Menut, J. L. ; Mohr, L. ; Mosoni, L. ; Navarro, R. ; Nubbaum, E. ; Pallanca, L. ; Pantin, E. ; Pasquini, L. ; Phan Duc, T. ; Pott, J. -U.; Pozna, E. ; Richichi, A. ; Ridinger, A. ; Rigal, F. ; Rivinius, Th. ; Roelfsema, R. ; Rohloff, R. -R. ; Rousseau, S. ; Salabert, D. ; Schertl, D. ; Schuhler, N. ; Schuil, M. ; Shabun, K. ; Soulain, A. ; Stephan, C. ; Toledo, P. ; Tristram, K. ; Tromp, N. ; Vakili, F. ; Varga, J. ; Vinther, J. ; Waters, L. B. F. M. ; Wittkowski, M. ; Wolf, S. ; Wrhel, F. ; Yoffe, G. -- "MATISSE, the VLTI mid-infrared imaging spectro-interferometer" (A&A)

2022

Chiavassa, A. ; Kravchenko, K. ; Montarges, M. ; Millour, F. ; Matter, A. ; Freytag, B. ; Wittkowski, M. ; Hocde, V. ; Cruzalebes, P. ; Allouche, F. ; Lopez, B. ; Lagarde, S. ; Petrov, R. G. ; Meilland, A. ; Robbe-Dubois, S. ; Hofmann, K. -H. ; Weigelt, G. ; Berio, P. ; Bendjoya, P. ; Bettonvil, F. ; Domiciano de Souza, A. ; Heininger, M. ; Henning, Th. ; Isbell, J. W. ; Jaffe, W. ; Labadie, L. ; Lehmitz, M. ; Meisenheimer, K. ; Soulain, A. ; Varga, J. ; Augereau, J. -C. ; van Boekel, R. ; Burtscher, L. ; Danchi, W. C. ; Dominik, C. ; Drevon, J. ; Gamez Rosas, V. ; Hogerheijde, M. R. ; Hron, J. ; Klarmann, L. ; Kokoulina, E. ; Lagadec, E. ; Leftley, J. ; Mosoni, L. ; Nardetto, N. ; Paladini, C. ; Pantin, E. ; Schertl, D. ; Stee, P. ; Szabados, L. ; Waters, R. ; Wolf, S. ; Yoffe, G. -- "The extended atmosphere and circumstellar environment of the cool evolved star VX Sagittarii as seen by MATISSE" (A&A)

2022

Hofmann, K. -H. ; Bensberg, A.; Schertl, D. ; Weigelt, G. ; Wolf, S.; Meilland, A. ; Millour, F. ; Waters, L. B. F. M. ; Kraus, S. ; Ohnaka, K. ; Lopez, B. ; Petrov, R. G.; Lagarde, S. ; Berio, Ph. ; Allouche, F. ; Robbe-Dubois, S. ; Jaffe, W. ; Henning, Th. ; Paladini, C. ; Scholler, M. ; Merand, A. ; Glindemann, A. ; Beckmann, U. ; Heininger, M. ; Bettonvil, F. ; Zins, G. ; Woillez, J. ; Bristow, P. ; Stee, P. ; Vakili, F. ; van Boekel, R. ; Hogerheijde, M. R. ; Dominik, C. ; Augereau, J. -C. ; Matter, A. ; Hron, J. ; Pantin, E. ; Rivinius, Th. ; de Wit, W. -J. ; Varga, J. ; Klarmann, L. ; Meisenheimer, K. ; Gamez Rosas, V. ; Burtscher, L. ; Leftley, J. ; Isbell, J. W. ; Yoffe, G. ; Kokoulina, E. ; Danchi, W. C. ; Cruzalebes, P. ; Domiciano de Souza, A. ; Drevon, J. ; Hocde, V. ; Kreplin, A. ; Labadie, L. ; Connot, C. ; Nubbaum, E. ; Lehmitz, M. ; Antonelli, P. ; Graser, U. ; Leinert, C. -- "VLTI-MATISSE L- and N-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris" (A&A)

2021

Weigelt, G. ; Hofmann, K. -H. ; Schertl, D. ; Lopez, B. ; Petrov, R. G. ; Lagarde, S. ; Berio, Ph. ; Jaffe, W. ; Henning, Th. ; Millour, F. ; Meilland, A. ; Allouche, F. ; Robbe-Dubois, S. ; Matter, A. ; Cruzalebes, P. ; Hillier, D. J. ; Russell, C. M. P. ; Madura, T. ; Gull, T. R. ; Corcoran, M. F. ; Damineli, A. ; Moffat, A. F. J. ; Morris, P. W. ; Richardson, N. D. ; Paladini, C. ; Scholler, M. ; Merand, A. ; Glindemann, A. ; Beckmann, U. ; Heininger, M. ; Bettonvil, F. ; Zins, G. ; Woillez, J. ; Bristow, P. ; Sanchez-Bermudez, J. ; Ohnaka, K. ; Kraus, S. ; Mehner, A. ; Wittkowski, M. ; Hummel, C. A. ; Stee, P. ; Vakili, F. ; Hartman, H. ; Navarete, F. ; Hamaguchi, K. ; Espinoza-Galeas, D. A. ; Stevens, I. R. ; van Boekel, R. ; Wolf, S. ; Hogerheijde, M. R. ; Dominik, C. ; Augereau, J. -C. ; Pantin, E. ; Waters, L. B. F. M. ; Meisenheimer, K. ; Varga, J. ; Klarmann, L. ; Gamez Rosas, V. ; Burtscher, L. ; Leftley, J. ; Isbell, J. W. ; Hocde, V. ; Yoffe, G. ; Kokoulina, E. ; Hron, J. ; Groh, J. ; Kreplin, A. ; Rivinius, Th. ; de Wit, W. -J. ; Danchi, W. -C. ; Domiciano de Souza, A. ; Drevon, J. ; Labadie, L. ; Connot, C. ; Nubbaum, E. ; Lehmitz, M. ; Antonelli, P. ; Graser, U. ; Leinert, C. -- "VLTI-MATISSE chromatic aperture-synthesis imaging of ? Carinae's stellar wind across the Bra line. Periastron passage observations in February 2020" (A&A)

2021

Kokoulina, E. ; Matter, A. ; Lopez, B. ; Pantin, E. ; Ysard, N. ; Weigelt, G. ; Habart, E. ; Varga, J. ; Jones, A. ; Meilland, A. ; Dartois, E. ; Klarmann, L. ; Augereau, J. -C. ; van Boekel, R. ; Hogerheijde, M. ; Yoffe, G. ; Waters, L. B. F. M. ; Dominik, C. ; Jaffe, W. ; Millour, F. ; Henning, Th. ; Hofmann, K. -H. ; Schertl, D. ; Lagarde, S. ; Petrov, R. G. ; Antonelli, P. ; Allouche, F. ; Berio, P. ; Robbe-Dubois, S. ; Abraham, P. ; Beckmann, U. ; Bensberg, A. ; Bettonvil, F. ; Bristow, P. ; Cruzalebes, P. ; Danchi, W. C. ; Dannhoff, M. ; Graser, U. ; Heininger, M. ; Labadie, L. ; Lehmitz, M. ; Leinert, C. ; Meisenheimer, K. ; Paladini, C. ; Percheron, I. ; Stee, Ph. ; Woillez, J. ; Wolf, S. ; Zins, G. ; Delbo, M. ; Drevon, J. ; Duprat, J. ; Gamez Rosas, V. ; Hocde, V. ; Hron, J. ; Hummel, C. A. ; Isbell, J. W. ; Leftley, J. ; Soulain, A. ; Vakili, F. ; Wittkowski, M. -- "First MATISSE L-band observations of HD 179218. Is the inner 10 au region rich in carbon dust particles?" (A&A)

Talks

2024 (jul.)

The close circumstellar environment of Betelgeuse during the Great Dimming Event as seen by VLTI/MATISSE, European Astronomical Society Conference (EAS)

2024 (jun.)

Study of the dust formation process around evolved stars with the VLTI/MATISSE instrument, Astrophysic Laboratory of Bordeaux seminar.

2023 (apr.)

Interferometry with MATISSE: Observation of evolved stars, Laboratory Lagrange day

2023 (jan.)

Evolved stars with MATISSE, a new approach using RHAPSODY, Monthly conferences at the Vienne Observatory

2023 (jan.)

Evolved stars with MATISSE, a new approach using RHAPSODY, VLTI and ALMA symthesis, Imaging Workshop

2023 (jan.)

Where are dust and molecules around R Sculptoris?, CAMK Torun seminar

2022 (nov.)

Where are dust and molecules around R Sculptoris?, CAMK Torun seminar

2022 (jul.)

RHAPSODY: Reconstructing Hankel RrAdial Profiles in centro-Symmetric Objects with Discrete rings for astrophYsics, SPIE Astronomical Telescopes and Instrumentation Meeting

2022 (jul.)

Multichromatic radial profil reconstruction with RHAPSODY. Application to evolved stars observed with VLTI/MATISSE, EAS Conference

2022 (apr.)

MATISSE first pictures of dust and molecules around R Scl, High Angular Resolution Astronomy Workshop

2021 (nov.)

MATISSE/VLTI: Highlight on dust and molecules around R Scl, The Origin of Outflows in Evolved Stars, IAU Symposium 36: Virtual Meeting

2021 (apr.)

MATISSE/VLTI : Highlight on dust and molecules around R Scl, Lagrange laboratory day

2020 (oct.)

R Scl observed with VLTI/MATISSE, Dust & Metals 2020 Conference

2020 (oct.)

MATISSE/VLTI: Highlight on dust and molecules around R Scl, Ground-based thermal infrared astronomy, past, present, and future

Education

Contenu de la section Education.

Outreach

Contenu de la section Outreach.