Nick Langellier

Postdoctoral Fellow

Ph.D. Physics, Harvard University, 2020
B.S. Engineering Physics, University of Illinois at Urbana-Champaign, 2011

Nick's research focuses on precision radial velocity detection of habitable exoplanets around sun-like stars and machine learning applied to precision measurements.

nlangellier@gmail.com

Fun Fact: Nick loves rock climbing. His favorite climb was a 550 foot (180 meter) rock face in the Yunnan province of China called "Fly Me to the Moon"!

Machine learning for improved current-density reconstruction from two-dimensional vector magnetic images. Niko R. Reed, Danyal Bhutto, Matthew J. Turner, Declan M. Daly, Sean M. Oliver, Jiashen Tang, Kevin S. Olsson, Nicholas Langellier, Mark J.H. Ku, Matthew S. Rosen, and Ronald L. Walsworth. Phys. Rev. Appl. 23, 034035 (2025). link PDF
BibTeX
@article{REED2025, sort_date = {2025-03-17}, sort_date_type = {journal-publication}, title = {Machine learning for improved current-density reconstruction from two-dimensional vector magnetic images}, author = {Reed, Niko R. and Bhutto, Danyal and Turner, Matthew J. and Daly, Declan M. and Oliver, Sean M. and Tang, Jiashen and Olsson, Kevin S. and Langellier, Nicholas and Ku, Mark J.H. and Rosen, Matthew S. and Walsworth, Ronald L.}, journal = {Phys. Rev. Appl.}, volume = {23}, issue = {3}, pages = {034035}, numpages = {16}, year = {2025}, month = {Mar}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.23.034035}, day = {17}, url_link = {https://link.aps.org/doi/10.1103/PhysRevApplied.23.034035}, url_pdf = {/files/2025/03/2025_Reed_PRApplied.pdf}, keywords = {quantum-sensing, ml-agentic}, eprint = {2407.14553}, archiveprefix = {arXiv} }

arXiv

Estimating Magnetic Filling Factors from Simultaneous Spectroscopy and Photometry: Disentangling Spots, Plage, and Network. T. W. Milbourne, D. F. Phillips, N. Langellier, A. Mortier, R. D. Haywood, S. H. Saar, H. M. Cegla, A. Collier Cameron, X. Dumusque, D. W. Latham, L. Malavolta, J. Maldonado, S. Thompson, A. Vanderburg, C. A. Watson, L. A. Buchhave, M. Cecconi, R. Cosentino, A. Ghedina, M. Gonzalez, M. Lodi, M. López-Morales, A. Sozzetti, and R. L. Walsworth. The Astrophysical Journal 920, 21 (2021). link PDF
BibTeX
@article{Milbourne2021, sort_date = {2021-10}, sort_date_type = {journal-issue}, doi = {10.3847/1538-4357/ac1266}, url_link = {https://doi.org/10.3847/1538-4357/ac1266}, url_pdf = {/files/2020/08/2021_Milbourne_ApJ.pdf}, year = {2021}, month = {Oct}, comment = {10}, publisher = {American Astronomical Society}, volume = {920}, number = {1}, pages = {21}, author = {T. W. Milbourne and D. F. Phillips and N. Langellier and A. Mortier and R. D. Haywood and S. H. Saar and H. M. Cegla and A. Collier Cameron and X. Dumusque and D. W. Latham and L. Malavolta and J. Maldonado and S. Thompson and A. Vanderburg and C. A. Watson and L. A. Buchhave and M. Cecconi and R. Cosentino and A. Ghedina and M. Gonzalez and M. Lodi and M. L{\'{o}}pez-Morales and A. Sozzetti and R. L. Walsworth}, title = {Estimating Magnetic Filling Factors from Simultaneous Spectroscopy and Photometry: Disentangling Spots, Plage, and Network}, journal = {The Astrophysical Journal}, keywords = {astro}, eprint = {2105.09113}, archiveprefix = {arXiv} }

arXiv
Detection Limits of Low-mass, Long-period Exoplanets Using Gaussian Processes Applied to HARPS-N Solar Radial Velocities. N. Langellier, T. W. Milbourne, D. F. Phillips, R. D. Haywood, S. H. Saar, A. Mortier, L. Malavolta, S. Thompson, A. Collier Cameron, X. Dumusque, H. M. Cegla, D. W. Latham, J. Maldonado, C. A. Watson, N. Buchschacher, M. Cecconi, D. Charbonneau, R. Cosentino, A. Ghedina, M. Gonzalez, C-H. Li, M. Lodi, M. López-Morales, G. Micela, E. Molinari, F. Pepe, E. Poretti, K. Rice, D. Sasselov, A. Sozzetti, S. Udry, and R. L. Walsworth. The Astronomical Journal 161, 287 (2021). link PDF
BibTeX
@article{Langellier2021, sort_date = {2021-06}, sort_date_type = {journal-issue}, doi = {10.3847/1538-3881/abf1e0}, year = {2021}, month = {may}, comment = {05}, publisher = {American Astronomical Society}, volume = {161}, number = {6}, pages = {287}, author = {N. Langellier and T. W. Milbourne and D. F. Phillips and R. D. Haywood and S. H. Saar and A. Mortier and L. Malavolta and S. Thompson and A. Collier Cameron and X. Dumusque and H. M. Cegla and D. W. Latham and J. Maldonado and C. A. Watson and N. Buchschacher and M. Cecconi and D. Charbonneau and R. Cosentino and A. Ghedina and M. Gonzalez and C-H. Li and M. Lodi and M. L{\'{o}}pez-Morales and G. Micela and E. Molinari and F. Pepe and E. Poretti and K. Rice and D. Sasselov and A. Sozzetti and S. Udry and R. L. Walsworth}, title = {Detection Limits of Low-mass, Long-period Exoplanets Using Gaussian Processes Applied to {HARPS}-N Solar Radial Velocities}, journal = {The Astronomical Journal}, url_pdf = {/files/2020/08/2021_Langellier_AJ.pdf}, url_link = {https://doi.org/10.3847/1538-3881/abf1e0}, keywords = {astro}, eprint = {2008.05970}, archiveprefix = {arXiv} }

arXiv

Magnetic Field Fingerprinting of Integrated-Circuit Activity with a Quantum Diamond Microscope. Matthew J. Turner, Nicholas Langellier, Rachel Bainbridge, Dan Walters, Srujan Meesala, Thomas M. Babinec, Pauli Kehayias, Amir Yacoby, Evelyn Hu, Marko Lončar, Ronald L. Walsworth, and Edlyn V. Levine. Physical Review Applied 14, 014097 (2020). link PDF supplement
BibTeX
@article{Turner2020, eprint = {2004.03707}, archiveprefix = {arXiv}, sort_date = {2020-07-31}, sort_date_type = {journal-publication}, author = {Turner, Matthew J. and Langellier, Nicholas and Bainbridge, Rachel and Walters, Dan and Meesala, Srujan and Babinec, Thomas M. and Kehayias, Pauli and Yacoby, Amir and Hu, Evelyn and Lon\u{c}ar, Marko and Walsworth, Ronald L. and Levine, Edlyn V.}, title = {Magnetic {Field} {Fingerprinting} of {Integrated}-{Circuit} {Activity} with a {Quantum} {Diamond} {Microscope}}, journal = {Physical Review Applied}, year = {2020}, volume = {14}, number = {1}, pages = {014097}, month = {jul}, comment = {07}, doi = {10.1103/PhysRevApplied.14.014097}, keywords = {quantum-sensing, ml-agentic}, url_link = {https://link.aps.org/doi/10.1103/PhysRevApplied.14.014097}, url_pdf = {/files/2020/08/2020_Turner_PRApplied.pdf}, url_supplement = {/files/2020/08/2020_Turner_PRApplied_SM.pdf} }

arXiv
Testing the Spectroscopic Extraction of Suppression of Convective Blueshift. M. Miklos, T. W. Milbourne, R. D. Haywood, D. F. Phillips, S. H. Saar, N. Meunier, H. M. Cegla, X. Dumusque, N. Langellier, J. Maldonado, L. Malavolta, A. Mortier, S. Thompson, C. A. Watson, M. Cecconi, R. Cosentino, A. Ghedina, C.H. Li, M. López-Morales, E. Molinari, Ennio Poretti, D. Sasselov, A. Sozzetti, and R. L. Walsworth. The Astrophysical Journal 888, 117 (2020). link PDF
BibTeX
@article{Miklos2020, eprint = {1910.09038}, archiveprefix = {arXiv}, sort_date = {2020-01-10}, sort_date_type = {journal-issue}, author = {Miklos, M. and Milbourne, T. W. and Haywood, R. D. and Phillips, D. F. and Saar, S. H. and Meunier, N. and Cegla, H. M. and Dumusque, X. and Langellier, N. and Maldonado, J. and Malavolta, L. and Mortier, A. and Thompson, S. and Watson, C. A. and Cecconi, M. and Cosentino, R. and Ghedina, A. and Li, C.H. and L\'{o}pez-Morales, M. and Molinari, E. and Poretti, Ennio and Sasselov, D. and Sozzetti, A. and Walsworth, R. L.}, title = {Testing the {Spectroscopic} {Extraction} of {Suppression} of {Convective} {Blueshift}}, journal = {The Astrophysical Journal}, year = {2020}, volume = {888}, number = {2}, pages = {117}, month = {jan}, comment = {01}, doi = {10.3847/1538-4357/ab59d5}, keywords = {astro}, url_link = {https://doi.org/10.3847%2F1538-4357%2Fab59d5}, url_pdf = {/files/2020/08/2020_Miklos_ApJ.pdf} }

arXiv

Principles and techniques of the quantum diamond microscope. Edlyn V. Levine, Matthew J. Turner, Pauli Kehayias, Connor A. Hart, Nicholas Langellier, Raisa Trubko, David R. Glenn, Roger R. Fu, and Ronald L. Walsworth. Nanophotonics 8, 1945–1973 (2019). link PDF
BibTeX
@article{Levine2019, sort_date = {2019-09-17}, sort_date_type = {journal-publication}, author = {Levine, Edlyn V. and Turner, Matthew J. and Kehayias, Pauli and Hart, Connor A. and Langellier, Nicholas and Trubko, Raisa and Glenn, David R. and Fu, Roger R. and Walsworth, Ronald L.}, title = {Principles and techniques of the quantum diamond microscope}, journal = {Nanophotonics}, year = {2019}, volume = {8}, number = {11}, pages = {1945--1973}, month = {sep}, comment = {09}, doi = {10.1515/nanoph-2019-0209}, keywords = {quantum-sensing}, url_link = {https://www.degruyter.com/view/journals/nanoph/8/11/article-p1945.xml}, url_pdf = {/files/2020/08/2019_Turner_Nanophotonics.pdf} }
Probing Dark Matter Using Precision Measurements of Stellar Accelerations. Aakash Ravi, Nicholas Langellier, David F. Phillips, Malte Buschmann, Benjamin R. Safdi, and Ronald L. Walsworth. Physical Review Letters 123, 091101 (2019). link PDF supplement
BibTeX
@article{Ravi2019, eprint = {1812.07578}, archiveprefix = {arXiv}, sort_date = {2019-08-28}, sort_date_type = {journal-publication}, author = {Ravi, Aakash and Langellier, Nicholas and Phillips, David F. and Buschmann, Malte and Safdi, Benjamin R. and Walsworth, Ronald L.}, title = {Probing {Dark} {Matter} {Using} {Precision} {Measurements} of {Stellar} {Accelerations}}, journal = {Physical Review Letters}, year = {2019}, volume = {123}, number = {9}, pages = {091101}, month = {aug}, comment = {08}, doi = {10.1103/PhysRevLett.123.091101}, keywords = {astro, fundamental-phys}, url_link = {https://link.aps.org/doi/10.1103/PhysRevLett.123.091101}, url_pdf = {/files/2020/08/2019_Ravi_PRL.pdf}, url_supplement = {/files/2020/08/2019_Ravi_PRL_SM.pdf} }

arXiv
Three years of Sun-as-a-star radial-velocity observations on the approach to solar minimum. A. Collier Cameron, A. Mortier, D. Phillips, X. Dumusque, R. D. Haywood, N. Langellier, C. A. Watson, H. M. Cegla, J. Costes, D. Charbonneau, A. Coffinet, D. W. Latham, M. López-Morales, L. Malavolta, J. Maldonado, G. Micela, T. Milbourne, E. Molinari, S. H. Saar, S. Thompson, N. Buchschacher, M. Cecconi, R. Cosentino, A. Ghedina, A. Glenday, M. Gonzalez, C.-H. Li, M. Lodi, C. Lovis, F. Pepe, E. Poretti, K. Rice, D. Sasselov, A. Sozzetti, A. Szentgyorgyi, S. Udry, and R. Walsworth. Monthly Notices of the Royal Astronomical Society 487, 1082–1100 (2019). link PDF
BibTeX
@article{CollierCameron2019, eprint = {1904.12186}, archiveprefix = {arXiv}, sort_date = {2019-07-21}, sort_date_type = {journal-issue}, author = {Collier Cameron, A. and Mortier, A. and Phillips, D. and Dumusque, X. and Haywood, R. D. and Langellier, N. and Watson, C. A. and Cegla, H. M. and Costes, J. and Charbonneau, D. and Coffinet, A. and Latham, D. W. and L\'{o}pez-Morales, M. and Malavolta, L. and Maldonado, J. and Micela, G. and Milbourne, T. and Molinari, E. and Saar, S. H. and Thompson, S. and Buchschacher, N. and Cecconi, M. and Cosentino, R. and Ghedina, A. and Glenday, A. and Gonzalez, M. and Li, C.-H. and Lodi, M. and Lovis, C. and Pepe, F. and Poretti, E. and Rice, K. and Sasselov, D. and Sozzetti, A. and Szentgyorgyi, A. and Udry, S. and Walsworth, R.}, title = {Three years of {Sun}-as-a-star radial-velocity observations on the approach to solar minimum}, journal = {Monthly Notices of the Royal Astronomical Society}, year = {2019}, volume = {487}, number = {1}, pages = {1082--1100}, month = {jul}, comment = {07}, doi = {10.1093/mnras/stz1215}, keywords = {astro}, url_link = {https://academic.oup.com/mnras/article/487/1/1082/5485657}, url_pdf = {/files/2020/08/2019_ACC_MNRAS.pdf} }

arXiv
HARPS-N Solar RVs Are Dominated by Large, Bright Magnetic Regions. T. W. Milbourne, R. D. Haywood, D. F. Phillips, S. H. Saar, H. M. Cegla, A. C. Cameron, J. Costes, X. Dumusque, N. Langellier, D. W. Latham, J. Maldonado, L. Malavolta, A. Mortier, M. L. Palumbo III, S. Thompson, C. A. Watson, F. Bouchy, N. Buchschacher, M. Cecconi, D. Charbonneau, R. Cosentino, A. Ghedina, A. G. Glenday, M. Gonzalez, C.-H. Li, M. Lodi, M. López-Morales, C. Lovis, M. Mayor, G. Micela, E. Molinari, F. Pepe, G. Piotto, K. Rice, D. Sasselov, D. Ségransan, A. Sozzetti, A. Szentgyorgyi, S. Udry, and R. L. Walsworth. The Astrophysical Journal 874, 107 (2019). link PDF
BibTeX
@article{Milbourne2019, eprint = {1902.04184}, archiveprefix = {arXiv}, sort_date = {2019-03-20}, sort_date_type = {journal-issue}, author = {Milbourne, T. W. and Haywood, R. D. and Phillips, D. F. and Saar, S. H. and Cegla, H. M. and Cameron, A. C. and Costes, J. and Dumusque, X. and Langellier, N. and Latham, D. W. and Maldonado, J. and Malavolta, L. and Mortier, A. and III, M. L. Palumbo and Thompson, S. and Watson, C. A. and Bouchy, F. and Buchschacher, N. and Cecconi, M. and Charbonneau, D. and Cosentino, R. and Ghedina, A. and Glenday, A. G. and Gonzalez, M. and Li, C.-H. and Lodi, M. and L\'{o}pez-Morales, M. and Lovis, C. and Mayor, M. and Micela, G. and Molinari, E. and Pepe, F. and Piotto, G. and Rice, K. and Sasselov, D. and S\'{e}gransan, D. and Sozzetti, A. and Szentgyorgyi, A. and Udry, S. and Walsworth, R. L.}, title = {{HARPS}-{N} {Solar} {RVs} {Are} {Dominated} by {Large}, {Bright} {Magnetic} {Regions}}, journal = {The Astrophysical Journal}, year = {2019}, volume = {874}, number = {1}, pages = {107}, month = {mar}, comment = {03}, doi = {10.3847/1538-4357/ab064a}, keywords = {astro}, url_link = {https://doi.org/10.3847%2F1538-4357%2Fab064a}, url_pdf = {/files/2020/08/2019_Milbourne_ApJ.pdf} }

arXiv

Gravitational wave detection with optical lattice atomic clocks. S. Kolkowitz, I. Pikovski, N. Langellier, M.D. Lukin, R.L. Walsworth, and J. Ye. Physical Review D 94, 124043 (2016). link PDF supplement
BibTeX
@article{Kolkowitz2016, eprint = {1606.01859}, archiveprefix = {arXiv}, sort_date = {2016-12-27}, sort_date_type = {journal-publication}, author = {Kolkowitz, S. and Pikovski, I. and Langellier, N. and Lukin, M.D. and Walsworth, R.L. and Ye, J.}, title = {Gravitational wave detection with optical lattice atomic clocks}, journal = {Physical Review D}, year = {2016}, volume = {94}, number = {12}, pages = {124043}, month = {dec}, comment = {12}, doi = {10.1103/PhysRevD.94.124043}, keywords = {fundamental-phys}, url_link = {https://link.aps.org/doi/10.1103/PhysRevD.94.124043}, url_pdf = {/files/2020/08/2016_Kolkowitz_PRD.pdf}, url_supplement = {/files/2020/08/2016_Kolkowitz_PRD_SM.pdf} }

arXiv

Operation of a broadband visible-wavelength astro-comb with a high-resolution astrophysical spectrograph. Alexander G. Glenday, Chih-Hao Li, Nicholas Langellier, Guoqing Chang, Li-Jin Chen, Gabor Furesz, Alexander A. Zibrov, Franz Kärtner, David F. Phillips, Dimitar Sasselov, Andrew Szentgyorgyi, and Ronald L. Walsworth. Optica 2, 250–254 (2015). link PDF supplement
BibTeX
@article{Glenday2015, sort_date = {2015-03-20}, sort_date_type = {journal-issue}, author = {Glenday, Alexander G. and Li, Chih-Hao and Langellier, Nicholas and Chang, Guoqing and Chen, Li-Jin and Furesz, Gabor and Zibrov, Alexander A. and K\"{a}rtner, Franz and Phillips, David F. and Sasselov, Dimitar and Szentgyorgyi, Andrew and Walsworth, Ronald L.}, title = {Operation of a broadband visible-wavelength astro-comb with a high-resolution astrophysical spectrograph}, journal = {Optica}, year = {2015}, volume = {2}, number = {3}, pages = {250--254}, month = {mar}, comment = {03}, doi = {10.1364/OPTICA.2.000250}, keywords = {astro}, url_link = {https://www.osapublishing.org/optica/abstract.cfm?uri=optica-2-3-250}, url_pdf = {/files/2020/08/2015_Glenday_Optica.pdf}, url_supplement = {/files/2020/08/2015_Glenday_Optica_SM.pdf} }

Conjugate Fabry-Perot cavity pair for improved astro-comb accuracy. Chih-Hao Li, Guoqing Chang, Alexander G. Glenday, Nicholas Langellier, Alexander Zibrov, David F. Phillips, Franz X. Kärtner, Andrew Szentgyorgyi, and Ronald L. Walsworth. Optics Letters 37, 3090–3092 (2012). link PDF
BibTeX
@article{Li2012, sort_date = {2012-08-01}, sort_date_type = {journal-issue}, author = {Li, Chih-Hao and Chang, Guoqing and Glenday, Alexander G. and Langellier, Nicholas and Zibrov, Alexander and Phillips, David F. and K\"{a}rtner, Franz X. and Szentgyorgyi, Andrew and Walsworth, Ronald L.}, title = {Conjugate {Fabry-Perot} cavity pair for improved astro-comb accuracy}, journal = {Optics Letters}, year = {2012}, volume = {37}, number = {15}, pages = {3090--3092}, month = {aug}, comment = {08}, doi = {10.1364/OL.37.003090}, keywords = {astro}, url_link = {https://www.osapublishing.org/ol/abstract.cfm?uri=ol-37-15-3090}, url_pdf = {/files/2020/08/2012_Li_OptLett.pdf} }

Nick Langellier

2025

2021

2020

2019

2016

2015

2012