Dr. Clément Geoffrey Ranc

Dr. Clément Geoffrey Ranc

  • Postdoctoral Fellow
  • 301.286.0454
  • NASA/GSFC
  • Employer: UNIVERSITIES SPACE RESEARCH ASSOCIATION
  • Brief Bio

    I am currently a NASA Postdoctoral Program Fellow at the Goddard Space Flight Center. After completing my Ph.D. at the Institut d'Astrophysique de Paris, France, I spent one year at the University Pierre & Marie Curie (Paris VI) as a Postdoctoral Research Associate, dividing my time between research and teaching.

    Research Interests

    Exoplanets Detection and Characterization

    I joined the Astrophysics Science Division in 2016 as a NASA Postdoctoral Program Fellow. My research interests lie in the field of exoplanets detection and characterization, as well as in numerical methods. My research is currently focused on the modeling of gravitational microlensing events to detect new planets and brown dwarfs located at Galactic distances, and on the development of modeling codes for this purpose. My work is part of the general effort to prepare the WFIRST mission and to understand better the exoplanets demography.

    Teaching Experience

    I taught an amount of 329 hours at the University Pierre & Marie Curie (Paris 6). It includes courses in physics and astrophysics at undergraduate and Master 1 levels, supervision of practical works, and oral examinations. I taught also 54 hours at the Hospital La Pitié-Salpêtrière in Paris, thermostatistics and nuclear physics applied to cancer treatments. Before my Ph.D., I was examiner in the French "Classes Préparatoires aux Grandes Écoles" for the French Ministry of Higher Education and Research. I was also a tutor at the École Normale Supérieure in Lyon from 2009 to 2011, and a full time teacher in high school
    during 3 months in 2009. I have been a mentor of many students.

    Selected Publications

    Refereed

    Cassan, A., and C. Ranc. 2016. "Interferometric observation of microlensing events." Monthly Notices of the Royal Astronomical Society, 458: 2074-2079 [10.1093/mnras/stw372]

    Bennett, D., S. Rhie, A. Udalski, et al. A. Gould, Y. Tsapras, D. Kubas, I. Bond, J. Greenhill, A. Cassan, N. Rattenbury, T. Boyajian, J. Luhn, M. Penny, J. Anderson, F. Abe, A. Bhattacharya, C. Botzler, M. Donachie, M. Freeman, A. Fukui, Y. Hirao, Y. Itow, N. Koshimoto, M. Li, C. Ling, K. Masuda, Y. Matsubara, Y. Muraki, M. Nagakane, K. Ohnishi, H. Oyokawa, Y. Perrott, T. Saito, A. Sharan, D. Sullivan, T. Sumi, D. Suzuki, P. Tristram, A. Yonehara, P. Yock, M. Collaboration, M. Szyma'nski, I. Soszy'nski, K. Ulaczyk, L. Wyrzykowski, O. Collaboration, W. Allen, D. DePoy, A. Gal-Yam, B. Gaudi, C. Han, I. Monard, E. Ofek, R. Pogge, $. Collaboration, R. Street, D. Bramich, M. Dominik, K. Horne, C. Snodgrass, I. Steele, R. Collaboration, M. Albrow, E. Bachelet, V. Batista, J.-P. Beaulieu, S. Brillant, J. Caldwell, A. Cole, C. Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, P. Fouqu'e, M. Hundertmark, U. Jorgensen, N. Kains, S. Kane, J.-B. Marquette, J. Menzies, K. Pollard, C. Ranc, K. Sahu, J. Wambsganss, A. Williams, M. Zub, and P. Collaboration. 2016. "The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c." The Astronomical Journal, 152: 125 [10.3847/0004-6256/152/5/125]

    Calchi Novati, S., A. Gould, A. Udalski, et al. J. Menzies, I. Bond, Y. Shvartzvald, R. Street, M. Hundertmark, C. Beichman, J. Yee, S. Carey, R. Poleski, J. Skowron, S. Kozlowski, P. Mr'oz, P. Pietrukowicz, G. Pietrzy'nski, M. Szyma'nski, I. Soszy'nski, K. Ulaczyk, L. Wyrzykowski, O. Collaboration, M. Albrow, J. Beaulieu, J. Caldwell, A. Cassan, C. Coutures, C. Danielski, D. Dominis Prester, J. Donatowicz, K. Lonv cari'c, A. McDougall, J. Morales, C. Ranc, W. Zhu, P. Collaboration, F. Abe, R. Barry, D. Bennett, A. Bhattacharya, D. Fukunaga, K. Inayama, N. Koshimoto, S. Namba, T. Sumi, D. Suzuki, P. Tristram, Y. Wakiyama, A. Yonehara, M. Collaboration, D. Maoz, S. Kaspi, M. Friedmann, W. Group, E. Bachelet, R. Figuera Jaimes, D. Bramich, Y. Tsapras, K. Horne, C. Snodgrass, J. Wambsganss, I. Steele, N. Kains, R. Collaboration, V. Bozza, M. Dominik, U. Jorgensen, K. Alsubai, S. Ciceri, G. D'Ago, T. Haugbolle, F. Hessman, T. Hinse, D. Juncher, H. Korhonen, L. Mancini, A. Popovas, M. Rabus, S. Rahvar, G. Scarpetta, R. Schmidt, J. Skottfelt, J. Southworth, D. Starkey, J. Surdej, O. Wertz, M. Zarucki, M. Consortium, B. Gaudi, R. Pogge, D. DePoy, and $. Collaboration. 2015. "Pathway to the Galactic Distribution of Planets: Combined Spitzer and Ground-Based Microlens Parallax Measurements of 21 Single-Lens Events." The Astrophysical Journal, 804: 20 [10.1088/0004-637X/804/1/20]

    Ranc, C., A. Cassan, M. D. Albrow, et al. D. Kubas, I. A. Bond, V. Batista, J.-P. Beaulieu, D. P. Bennett, M. Dominik, S. Dong, P. Fouqué, A. Gould, J. Greenhill, U. G. Jørgensen, N. Kains, J. Menzies, T. Sumi, E. Bachelet, C. Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, B. S. Gaudi, C. Han, M. Hundertmark, K. Horne, S. R. Kane, C.-U. Lee, J.-B. Marquette, B.-G. Park, K. R. Pollard, K. C. Sahu, R. Street, Y. Tsapras, J. Wambsganss, A. Williams, M. Zub, F. Abe, A. Fukui, Y. Itow, K. Masuda, Y. Matsubara, Y. Muraki, K. Ohnishi, N. Rattenbury, T. Saito, D. J. Sullivan, W. L. Sweatman, P. J. Tristram, P. C. Yock, and A. Yonehara. 2015. "MOA-2007-BLG-197: Exploring the brown dwarf desert." Astronomy & Astrophysics, 580: A125 [10.1051/0004-6361/201525791]

    Ranc, C. 2015. "Exoplanets and brown dwarfs detections through gravitational microlensing. Study of interferometric observations." HAL Archives Ouvertes, Ph.D. Thesis: 313 pages.

    Boisse, I., A. Santerne, J.-P. Beaulieu, et al. W. Fakhardji, N. Santos, P. Figueira, S. Sousa, and C. Ranc. 2015. "The first radial velocity measurements of a microlensing event: no evidence for the predicted binarystar." Astronomy & Astrophysics, 582: L11 [10.1051/0004-6361/201526666]

    Zahn, J.-P., C. Ranc, and P. Morel. 2010. "On the shape of rapidly rotating stars." Astronomy & Astrophysics, 517: A7 [10.1051/0004-6361/200913817]

    Selected Public Outreach

    NASA's Spitzer: a second eye to detect planets deep within the Milky Way 4 / 2015 - 4 / 2015

    I have been invited to the radio program "La Tête au Carré" at the French national radio "France Inter" to comment the very exciting first measurement of a parallax effect in a planetary microlensing event (OGLE-2014-BLG-124). The detected planet is 13,000 light-years away from Earth. It is one of the farthest know exoplanet in our Galaxy.

    URL (in French): https://www.franceinter.fr/sciences/de-nouvelles-pistes-pour-decouvrir-des-planetes-jumelles-de-la-terre

    Article: Udalski, A., Yee, J. C., Gould, A. et al. (2015), Spitzer as a Microlens Parallax Satellite: Mass Measurement for the OGLE-2014-BLG-0124L Planet and its Host Star, ApJ,  799, 237.

    Brief Bio

    I am currently a NASA Postdoctoral Program Fellow at the Goddard Space Flight Center. After completing my Ph.D. at the Institut d'Astrophysique de Paris, France, I spent one year at the University Pierre & Marie Curie (Paris VI) as a Postdoctoral Research Associate, dividing my time between research and teaching.

    Selected Publications

    Refereed

    Cassan, A., and C. Ranc. 2016. "Interferometric observation of microlensing events." Monthly Notices of the Royal Astronomical Society 458 2074-2079 [10.1093/mnras/stw372]

    Bennett, D., S. Rhie, A. Udalski, et al. A. Gould, Y. Tsapras, D. Kubas, I. Bond, J. Greenhill, A. Cassan, N. Rattenbury, T. Boyajian, J. Luhn, M. Penny, J. Anderson, F. Abe, A. Bhattacharya, C. Botzler, M. Donachie, M. Freeman, A. Fukui, Y. Hirao, Y. Itow, N. Koshimoto, M. Li, C. Ling, K. Masuda, Y. Matsubara, Y. Muraki, M. Nagakane, K. Ohnishi, H. Oyokawa, Y. Perrott, T. Saito, A. Sharan, D. Sullivan, T. Sumi, D. Suzuki, P. Tristram, A. Yonehara, P. Yock, M. Collaboration, M. Szyma'nski, I. Soszy'nski, K. Ulaczyk, L. Wyrzykowski, O. Collaboration, W. Allen, D. DePoy, A. Gal-Yam, B. Gaudi, C. Han, I. Monard, E. Ofek, R. Pogge, $. Collaboration, R. Street, D. Bramich, M. Dominik, K. Horne, C. Snodgrass, I. Steele, R. Collaboration, M. Albrow, E. Bachelet, V. Batista, J.-P. Beaulieu, S. Brillant, J. Caldwell, A. Cole, C. Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, P. Fouqu'e, M. Hundertmark, U. Jorgensen, N. Kains, S. Kane, J.-B. Marquette, J. Menzies, K. Pollard, C. Ranc, K. Sahu, J. Wambsganss, A. Williams, M. Zub, and P. Collaboration. 2016. "The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c." The Astronomical Journal 152 125 [10.3847/0004-6256/152/5/125]

    Calchi Novati, S., A. Gould, A. Udalski, et al. J. Menzies, I. Bond, Y. Shvartzvald, R. Street, M. Hundertmark, C. Beichman, J. Yee, S. Carey, R. Poleski, J. Skowron, S. Kozlowski, P. Mr'oz, P. Pietrukowicz, G. Pietrzy'nski, M. Szyma'nski, I. Soszy'nski, K. Ulaczyk, L. Wyrzykowski, O. Collaboration, M. Albrow, J. Beaulieu, J. Caldwell, A. Cassan, C. Coutures, C. Danielski, D. Dominis Prester, J. Donatowicz, K. Lonv cari'c, A. McDougall, J. Morales, C. Ranc, W. Zhu, P. Collaboration, F. Abe, R. Barry, D. Bennett, A. Bhattacharya, D. Fukunaga, K. Inayama, N. Koshimoto, S. Namba, T. Sumi, D. Suzuki, P. Tristram, Y. Wakiyama, A. Yonehara, M. Collaboration, D. Maoz, S. Kaspi, M. Friedmann, W. Group, E. Bachelet, R. Figuera Jaimes, D. Bramich, Y. Tsapras, K. Horne, C. Snodgrass, J. Wambsganss, I. Steele, N. Kains, R. Collaboration, V. Bozza, M. Dominik, U. Jorgensen, K. Alsubai, S. Ciceri, G. D'Ago, T. Haugbolle, F. Hessman, T. Hinse, D. Juncher, H. Korhonen, L. Mancini, A. Popovas, M. Rabus, S. Rahvar, G. Scarpetta, R. Schmidt, J. Skottfelt, J. Southworth, D. Starkey, J. Surdej, O. Wertz, M. Zarucki, M. Consortium, B. Gaudi, R. Pogge, D. DePoy, and $. Collaboration. 2015. "Pathway to the Galactic Distribution of Planets: Combined Spitzer and Ground-Based Microlens Parallax Measurements of 21 Single-Lens Events." The Astrophysical Journal 804 20 [10.1088/0004-637X/804/1/20]

    Ranc, C., A. Cassan, M. D. Albrow, et al. D. Kubas, I. A. Bond, V. Batista, J.-P. Beaulieu, D. P. Bennett, M. Dominik, S. Dong, P. Fouqué, A. Gould, J. Greenhill, U. G. Jørgensen, N. Kains, J. Menzies, T. Sumi, E. Bachelet, C. Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, B. S. Gaudi, C. Han, M. Hundertmark, K. Horne, S. R. Kane, C.-U. Lee, J.-B. Marquette, B.-G. Park, K. R. Pollard, K. C. Sahu, R. Street, Y. Tsapras, J. Wambsganss, A. Williams, M. Zub, F. Abe, A. Fukui, Y. Itow, K. Masuda, Y. Matsubara, Y. Muraki, K. Ohnishi, N. Rattenbury, T. Saito, D. J. Sullivan, W. L. Sweatman, P. J. Tristram, P. C. Yock, and A. Yonehara. 2015. "MOA-2007-BLG-197: Exploring the brown dwarf desert." Astronomy & Astrophysics 580 A125 [10.1051/0004-6361/201525791]

    Ranc, C. 2015. "Exoplanets and brown dwarfs detections through gravitational microlensing. Study of interferometric observations." HAL Archives Ouvertes Ph.D. Thesis 313 pages

    Boisse, I., A. Santerne, J.-P. Beaulieu, et al. W. Fakhardji, N. Santos, P. Figueira, S. Sousa, and C. Ranc. 2015. "The first radial velocity measurements of a microlensing event: no evidence for the predicted binarystar." Astronomy & Astrophysics 582 L11 [10.1051/0004-6361/201526666]

    Zahn, J.-P., C. Ranc, and P. Morel. 2010. "On the shape of rapidly rotating stars." Astronomy & Astrophysics 517 A7 [10.1051/0004-6361/200913817]

                                                                                                                                                                                            
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