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William O. Balmer

johns hopkins university

15H-index
104Paper Count
931Citation Count
Published Papers 41
Publication Date
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Deep Limits on Planets Exterior to HR 8799’s Known Planetary System with the James Webb Space Telescope
errThe Astronomical Journal
IF0
err2026-04-17
err0
errOAAI
errBryden Geoffrey; Llop-Sayson Jorge; Beichman Charles A.; Balmer William O.; Kammerer Jens; Leisenring Jarron M.; Ygouf Marie; Krist John; Faramaz-Gorka Virginie; Greenbaum Alexandra Z.; Girard Julien; Perrin Marshall; Pueyo Laurent; van der Marel Roeland; Meyer Michael; Johnstone Doug; Hodapp Klaus; Rieke Marcia
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Direct Images of CO2 Absorption in the Atmosphere of a Super-Jupiter: Enhanced Metallicity Suggestive of Formation in a Disk
errThe Astrophysical Journal Letters
IF0
err2026-04-14
err0
errOAAI
errWilliam O. Balmer; Laurent Pueyo; Ashley Messier; Evelyn Bruinsma; Jeremy Jones; Klara Matuszewska; Marshall D. Perrin; Julien H. Girard; Jarron M. Leisenring; Kellen Lawson; Roeland P. van der Marel; Jens Kammerer; Aarynn Carter; Mathilde Mâlin; Kimberly Ward-Duong; Kielan K. W. Hoch; Emily Rickman; Sara Seager
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The Compositions of the HR 8799 Planets Reflect Accretion of Both Solids and Metal-enriched Gas
errThe Astrophysical Journal
IF0
err2026-03-11
err0
errOAAI
errJerry W. Xuan; Jean-Baptiste Ruffio; Yayaati Chachan; Kazumasa Ohno; Aurora Kesseli; Ruth Murray-Clay; Eve J. Lee; Julianne I. Moses; William O. Balmer; Aneesh Baburaj; Geoffrey A. Blake; Doug Johnstone; Yapeng Zhang; Heather A. Knutson; Dimitri Mawet; Charles Beichman; Klaus Hodapp; Marshall D. Perrin; Quinn Konopacky; Michael Meyer; Geoffrey Bryden; Thomas P. Greene; Jarron Leisenring; Marie Ygouf; Björn Benneke; Julie Inglis; Nicole L. Wallack
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Jupiter-like uniform metal enrichment in a system of multiple giant exoplanets
errNature Astronomy
IF14.3
err2026-02-09
err0
PREAI
errJean-Baptiste Ruffio; Jerry W. Xuan; Yayaati Chachan; Aurora Kesseli; Eve J. Lee; Charles Beichman; Klaus Hodapp; William O. Balmer; Quinn Konopacky; Marshall D. Perrin; Dimitri Mawet; Heather A. Knutson; Geoffrey Bryden; Thomas P. Greene; Doug Johnstone; Jarron Leisenring; Michael Meyer; Marie Ygouf
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Discovery of a Debris Disk around TWA 20
errThe Astrophysical Journal
IF0
err2025-12-12
err0
errOAAI
errSkyler Palatnick; Maxwell A. Millar-Blanchaer; Jingwen Zhang; Kellen Lawson; Briley L. Lewis; Katie A. Crotts; Aarynn L. Carter; Beth Biller; Julien H. Girard; Sebastian Marino; Raphaël Bendahan-West; Giovanni M. Strampelli; Andrew D. James; Klaus Subbotina Stephenson; Rodrigo Ferrer-Chavez; Mark Booth; Ben J. Sutlieff; Aniket Sanghi; Clémence Fontanive; Emily Rickman; Isabel Rebollido; Kielan Hoch; William O. Balmer
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The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. VI. Evidence for Radially Evolving Icy Grains in the HD 141569A Disk via NIRCam Coronagraphic Imaging
errThe Astrophysical Journal
IF0
err2025-11-26
err0
errOAAI
errMaxwell A. Millar-Blanchaer; Élodie Choquet; Kellen Lawson; Sebastián Marino; Jens Kammerer; Aarynn L. Carter; Isabel Rebollido; Jarron M. Leisenring; Minjae Kim; Paul Kalas; Karl R Stapelfeldt; Sasha Hinkley; Mark Booth; Carol A. Grady; Elisabeth C. Matthews; Beth A. Biller; Andrew Skemer; Julien H. Girard; Schuyler G. Wolff; Kimberly Ward-Duong; Michael R. Meyer; Anthony Boccaletti; Eric Pantin; Brenda C. Matthews; Stanimir Metchev; Marshall D. Perrin; Christine H. Chen; Katie Crotts; Olivier Absil; William O. Balmer; Per Calissendorff; Gabriele Cugno; Thayne Currie; Camilla Danielski; Kielan K. W. Hoch; Markus Janson; Elena Manjavacas; Pierre-Olivier Lagage; Ben J. Sutlieff; Shrishmoy Ray; Bin B. Ren; Emily Rickman; Genaro Suárez; Christopher A. Theissen; Taichi Uyama; Andreas Quirrenbach; Jason J. Wang; Niall Whiteford; Mark C. Wyatt; Alice Zurlo; (The JWST ERS Collaboration)
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A Near-infrared Spectral Library of Very Young Brown Dwarfs and Planetary Mass Objects in the Orion Nebula Cluster
errThe Astrophysical Journal
IF0
err2025-11-14
err0
errOAAI
errElena Manjavacas; Mario Gennaro; Sarah Betti; Laurent Pueyo; William O. Balmer; Massimo Robberto
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Constraints on the Orbit of the Young Substellar Companion GQ Lup B from High-resolution Spectroscopy and VLTI/GRAVITY Astrometry*
errThe Astrophysical Journal
IF0
err2025-10-24
err0
errOAAI
errVidya Venkatesan; S. Blunt; J. J. Wang; S. Lacour; G.-D. Marleau; G. A. L. Coleman; L. Guerrero; W. O. Balmer; L. Pueyo; T. Stolker; J. Kammerer; N. Pourré; M. Nowak; E. Rickman; A. Sivaramakrishnan; D. Sing; K. Wagner; A.-M. Lagrange; R. Abuter; A. Amorim; R. Asensio-Torres; J.-P. Berger; H. Beust; A. Boccaletti; M. Bonnefoy; H. Bonnet; M. S. Bordoni; G. Bourdarot; W. Brandner; F. Cantalloube; P. Caselli; B. Charnay; G. Chauvin; A. Chavez; A. Chomez; E. Choquet; V. Christiaens; Y. Clénet; V. Coudé du Foresto; A. Cridland; R. Davies; R. Dembet; J. Dexter; A. Drescher; G. Duvert; A. Eckart; F. Eisenhauer; N. M. Förster Schreiber; P. Garcia; R. Garcia Lopez; E. Gendron; R. Genzel; S. Gillessen; J. H. Girard; S. Grant; X. Haubois; G. Heissel; Th. Henning; S. Hinkley; S. Hippler; M. Houllé; Z. Hubert; L. Jocou; M. Keppler; P. Kervella; L. Kreidberg; N. T. Kurtovic; V. Lapeyrère; J.-B. Le Bouquin; D. Lutz; A.-L. Maire; F. Mang; A. Mérand; C. Mordasini; D. Mouillet; E. Nasedkin; T. Ott; G. P. P. L. Otten; C. Paladini; T. Paumard; K. Perraut; G. Perrin; S. Petrus; O. Pfuhl; D. C. Ribeiro; Z. Rustamkulov; J. Shangguan; T. Shimizu; A. Shields; J. Stadler; O. Straub; C. Straubmeier; E. Sturm; L. J. Tacconi; A. Vigan; F. Vincent; S. D. von Fellenberg; F. Widmann; T. O. Winterhalder; J. Woillez; S. Yazici; the ExoGRAVITY Collaboration
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New Orbital Constraints for YSES 1 b and HR 2562 B from High-Precision Astrometry and Planetary Radial Velocities∗
errThe Astronomical Journal
IF0
err2025-10-17
err0
errOAAI
errJonathan Roberts; William Thompson; Jason J. Wang; Sarah Blunt; William O. Balmer; Guillaume Bourdarot; Brendan P. Bowler; Gael Chauvin; Frank Eisenhauer; Thomas K. Henning; Jens Kammerer; Flavien Kiefer; Matthew A. Kenworthy; Pierre Kervella; Sylvestre Lacour; A.-M. Lagrange; Eric L. Nielsen; Laurent Pueyo; Emily Rickman; Olli Sipilä; Silvia Spezzano; Tomas Stolker; Alice Zurlo
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Probing the Outskirts of M Dwarf Planetary Systems with a Cycle 1 JWST NIRCam Coronagraphy Survey
errastronomical journal
IF0
err2025-09-17
err0
errOAAI
errEllis Bogat; Joshua E. Schlieder; Kellen D. Lawson; Yiting Li; Jarron M. Leisenring; Michael R. Meyer; William Balmer; Thomas Barclay; Charles A. Beichman; Geoffrey Bryden; Per Calissendorff; Aarynn L. Carter; Matthew De Furio; Julien H. Girard; Thomas P. Greene; Tyler D. Groff; Jens Kammerer; Jorge Llop-Sayson; Michael W. McElwain; Marcia J. Rieke; Marie Ygouf
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Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of α Centauri A. II. Binary Star Modeling; Planet and Exozodi Search; and Sensitivity Analysis
errastrophysical journal letters
IF0
err2025-08-10
err0
PREAI
errAniket Sanghi; Charles Beichman; Dimitri Mawet; William O. Balmer; Nicolas Godoy; Laurent Pueyo; Anthony Boccaletti; Max Sommer; Alexis Bidot; Elodie Choquet; Pierre Kervella; Pierre-Olivier Lagage; Jarron Leisenring; Jorge Llop-Sayson; Michael Ressler; Kevin Wagner; Mark Wyatt
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Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of α Centauri A. I. Observations; Orbital and Physical Properties; and Exozodi Upper Limits
errastrophysical journal letters
IF0
err2025-08-10
err0
PREAI
errCharles Beichman; Aniket Sanghi; Dimitri Mawet; Pierre Kervella; Kevin Wagner; Billy Quarles; Jack J. Lissauer; Max Sommer; Mark Wyatt; Nicolas Godoy; William O. Balmer; Laurent Pueyo; Jorge Llop-Sayson; Jonathan Aguilar; Rachel Akeson; Ruslan Belikov; Anthony Boccaletti; Elodie Choquet; Edward Fomalont; Thomas Henning; Dean Hines; Renyu Hu; Pierre-Olivier Lagage; Jarron Leisenring; James Mang; Michael Ressler; Eugene Serabyn; Pascal Tremblin; Marie Ygouf; Mantas Zilinskas
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The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. III. Aperture Masking Interferometric Observations of the Star HIP 65426 at 3.8 μm
errASTROPHYSICAL JOURNAL LETTERS
IF11.7
err2025-04-09
err0
errOAAI
errRay, Shrishmoy; Sallum, Steph; Hinkley, Sasha; Sivaramkrishnan, Anand; Cooper, Rachel; Kammerer, Jens; Greebaum, Alexandra Z.; Thatte, Deeparshi; Stolker, Tomas; Lazzoni, Cecilia; Tokovinin, Andrei; de Furio, Matthew; Factor, Samuel; Meyer, Michael; Stone, Jordan M.; Carter, Aarynn; Biller, Beth; Skemer, Andrew; Suarez, Genaro; Leisenring, Jarron M.; Perrin, Marshall D.; Kraus, Adam L.; Absil, Olivier; Balmer, William O.; Boccaletti, Anthony; Bonavita, Mariangela; Bonnefoy, Mickael; Booth, Mark; Bowler, Brendan P.; Briesemeister, Zackery W.; Bryan, Marta L.; Calissendorff, Per; Cantalloube, Faustine; Chauvin, Gael; Chen, Christine H.; Choquet, Elodie; Christiaens, Valentin; Cugno, Gabriele; Currie, Thayne; Danielski, Camilla; Dupuy, Trent J.; Faherty, Jacqueline K.; Fitzgerald, Michael P.; Fortney, Jonathan J.; Franson, Kyle; Girard, Julien H.; Grady, Carol A.; Gonzales, Eileen C.; Henning, Thomas; Hines, Dean C.; Hoch, Kielan K. W.; Hood, Callie E.; Howe, Alex R.; Janson, Markus; Kalas, Paul; Kennedy, Grant M.; Kenworthy, Matthew A.; Kervella, Pierre; Kuzuhara, Masayuki; Lagrange, Anne-Marie; Lagage, Pierre-Olivier; Lawson, Kellen; Lew, Ben W. P.; Liu, Michael C.; Liu, Pengyu; Llop-Sayson, Jorge; Lloyd, James P.; Macintosh, Bruce; Marino, Sebastian; Marley, Mark S.; Marois, Christian; Martinez, Raquel A.; Matthews, Brenda C.; Matthews, Elisabeth C.; Mawet, Dimitri; Mazoyer, Johan; Mcelwain, Michael W.; Metchev, Stanimir; Meyer, Michael R.; Miles, Brittany E.; Millar-Blanchaer, Maxwell A.; Molliere, Paul; Moran, Sarah E.; Morley, Caroline V.; Mukherjee, Sagnick; Palma-Bifani, Paulina; Pantin, Eric; Patapis, Polychronis; Petrus, Simon; Pueyo, Laurent; Quanz, Sascha P.; Quirrenbach, Andreas; Rebollido, Isabel; Redai, Jea Adams; Ren, Bin B.; Rickman, Emily; Samland, Matthias; Schlieder, Joshua E.; Schneider, Glenn; Stapelfeldt, Karl R.; Tamura, Motohide; Tan, Xianyu; Uyama, Taichi; Vigan, Arthur; Vasist, Malavika; Vos, Johanna M.; Wagner, Kevin; Wang, Jason J.; Ward-Duong, Kimberly; Whiteford, Niall; Wolff, Schuyler G.; Worthen, Kadin; Wyatt, Mark C.; Ygouf, Marie; Zhang, Xi; Zhang, Keming; Zhang, Zhoujian; Zhou, Yifan; Zurlo, Alice; Sargent, B. A.; Theissen, Christopher A.; Manjavacas, Elena; Lueber, Anna; Kitzmann, Daniel; Sutlieff, Ben J.; Betti, Sarah K.
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JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO2 in the HR 8799 and 51 Eri Exoplanets' Atmospheres
errASTRONOMICAL JOURNAL
IF5.1
err2025-04-01
err0
errOAAI
errBalmer, William O.; Kammerer, Jens; Pueyo, Laurent; Perrin, Marshall D.; Girard, Julien H.; Leisenring, Jarron M.; Lawson, Kellen; Dennen, Henry; van der Marel, Roeland P.; Beichman, Charles A.; Bryden, Geoffrey; Llop-Sayson, Jorge; Valenti, Jeff A.; Lothringer, Joshua D.; Lewis, Nikole K.; Malin, Mathilde; Rebollido, Isabel; Rickman, Emily; Hoch, Kielan K. W.; Soummer, Remi; Clampin, Mark; Mountain, C. Matt
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Characterization of AF Lep b at high spectral resolution with VLT/HiRISE☆
errASTRONOMY & ASTROPHYSICS
IF5.8
err2025-03-31
err0
PREAI
errDenis, A.; Vigan, A.; Costes, J.; Chauvin, G.; Radcliffe, A.; Ravet, M.; Balmer, W.; Palma-Bifani, P.; Petrus, S.; Parmentier, V.; Martos, S.; Simonnin, A.; Bonnefoy, M.; Cadet, R.; Forveille, T.; Charnay, B.; Kiefer, F.; Lagrange, A. -M.; Chiavassa, A.; Stolker, T.; Lavail, A.; Godoy, N.; Janson, M.; Pourcelot, R.; Delorme, P.; Rickman, E.; Cont, D.; Reiners, A.; De Rosa, R.; Anwand-Heerwart, H.; Charles, Y.; Costille, A.; El Morsy, M.; Garcia, J.; Houlle, M.; Lopez, M.; Murray, G.; Muslimov, E.; Otten, G. P. P. L.; Paufique, J.; Phillips, M.; Seemann, U.; Viret, A.; Zins, G.
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VLTI/GRAVITY Observations of AF Lep b: Preference for Circular Orbits, Cloudy Atmospheres, and a Moderately Enhanced Metallicity
errASTRONOMICAL JOURNAL
IF5.1
err2024-12-16
err3
errOAAI
errBalmer, William O.; Franson, Kyle; Chomez, Antoine; Pueyo, Laurent; Stolker, Tomas; Lacour, Sylvestre; Nowak, Mathias; Nasedkin, Evert; Bonse, Markus J.; Thorngren, Daniel; Palma-Bifani, Paulina; Molliere, Paul; Wang, Jason J.; Zhang, Zhoujian; Chavez, Amanda; Kammerer, Jens; Blunt, Sarah; Bowler, Brendan P.; Bonnefoy, Mickael; Brandner, Wolfgang; Charnay, Benjamin; Chauvin, Gael; Henning, Th.; Lagrange, A. M.; Pourre, Nicolas; Rickman, Emily; De Rosa, Robert; Vigan, Arthur; Winterhalder, Thomas
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A JWST MIRI MRS View of the η Tel Debris Disk and Its Brown Dwarf Companion
errASTROPHYSICAL JOURNAL
IF5.4
err2024-11-20
err0
errOAAI
errChai, Yiwei; Chen, Christine H.; Worthen, Kadin; Li, Alexis; Sefilian, Antranik A.; Balmer, William; Hines, Dean C.; Law, David R.; Sargent, B. A.; Wyatt, Mark; Lu, Cicero X.; Perrin, Marshall D.; Rebollido, Isabel; Rickman, Emily; Sloan, G. C.
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Direct imaging and dynamical mass of a benchmark T-type brown dwarf companion to HD 167665
errASTRONOMY & ASTROPHYSICS
IF5.8
err2024-11-18
err0
errOAAI
errMaire, A-L; Leclerc, A.; Balmer, W. O.; Desidera, S.; Lacour, S.; D'Orazi, V; Samland, M.; Langlois, M.; Matthews, E.; Babusiaux, C.; Kervella, P.; Le Bouquin, J-B; Segransan, D.; Gratton, R.; Biller, B. A.; Bonavita, M.; Delorme, P.; Messina, S.; Udry, S.; Janson, M.; Henning, Th; Wahhaj, Z.; Zurlo, A.; Bonnefoy, M.; Brandner, W.; Cantalloube, F.; Galicher, R.; Kammerer, J.; Nowak, M.; Shangguan, J.; Stolker, T.; Wang, J. J.; Chauvin, G.; Hagelberg, J.; Lagrange, A-M; Vigan, A.; Meyer, M. R.; Beuzit, J-L; Boccaletti, A.; Lazzoni, C.; Mesa, D.; Perrot, C.; Squicciarini, V; Hinkley, S.; Nasedkin, E.; Abuter, R.; Amorim, A.; Benisty, M.; Berger, J-P; Blunt, S.; Bonnet, H.; Bourdarot, G.; Caselli, P.; Charnay, B.; Choquet, E.; Christiaens, V; Clenet, Y.; du Foresto, V. Coude; Cridland, A.; Dembet, R.; Dexter, J.; Drescher, A.; Duvert, G.; Eckart, A.; Eisenhauer, F.; Gao, F.; Garcia, P.; Lopez, R. Garcia; Gendron, E.; Genzel, R.; Gillessen, S.; Girard, J. H.; Haubois, X.; Heissel, G.; Hippler, S.; Houlle, M.; Hubert, Z.; Jocou, L.; Kreidberg, L.; Lapeyrere, V; Lena, P.; Lutz, D.; Menard, F.; Merand, A.; Molliere, P.; Monnier, J. D.; Mouillet, D.; Ott, T.; Otten, G. P. P. L.; Paladini, C.; Paumard, T.; Perraut, K.; Perrin, G.; Pfuhl, O.; Pourre, N.; Pueyo, L.; Rickman, E.; Rousset, G.; Rustamkulov, Z.; Shimizu, T.; Sing, D.; Stadler, J.; Straub, O.; Straubmeier, C.; Sturm, E.; Tacconi, L. J.; van Dishoeck, E. F.; Vincent, F.; von Fellenberg, S. D.; Widmann, F.; Wieprecht, E.; Woillez, J.; Yazici, S.
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JWST/NIRCam 4-5 μm Imaging of the Giant Planet AF Lep b
errASTROPHYSICAL JOURNAL LETTERS
IF11.7
err2024-10-04
err1
errOAAI
errFranson, Kyle; Balmer, William O.; Bowler, Brendan P.; Pueyo, Laurent; Zhou, Yifan; Rickman, Emily; Zhang, Zhoujian; Mukherjee, Sagnick; Pearce, Tim D.; Gagliuffi, Daniella C. Bardalez; Biddle, Lauren I.; Brandt, Timothy D.; Bowens-Rubin, Rachel; Crepp, Justin R.; Davidson Jr, James W.; Faherty, Jacqueline; Ginski, Christian; Horch, Elliott P.; Morgan, Marvin; Morley, Caroline V.; Perrin, Marshall D.; Sanghi, Aniket; Salama, Maissa; Theissen, Christopher A.; Tran, Quang H.; Wolf, Trevor N.
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JWST-TST High Contrast: Spectroscopic Characterization of the Benchmark Brown Dwarf HD 19467 B with the NIRSpec Integral Field Spectrograph
errASTRONOMICAL JOURNAL
IF5.1
err2024-10-01
err1
errOAAI
errHoch, Kielan K. W.; Theissen, Christopher A.; Barman, Travis S.; Perrin, Marshall D.; Ruffio, Jean-Baptiste; Rickman, Emily; Konopacky, Quinn M.; Manjavacas, Elena; Balmer, William O.; Pueyo, Laurent; Kammerer, Jens; van der Marel, Roeland P.; Lewis, Nikole K.; Girard, Julien H.; Seager, Sara; Clampin, Mark; Mountain, C. Matt
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Research Directions

No research directions
Co-authors
Cooperation Journals
A
A. Amorim
H-index: 141 · Papers: 1.5K
S
S. Udry
H-index: 129 · Papers: 1.7K
R
R. Genzel
H-index: 125 · Papers: 1.2K
E
E. F. van Dishoeck
H-index: 123 · Papers: 1.5K
J
Jonathan J. Fortney
H-index: 107 · Papers: 1.0K
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