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Calder Lenhart

lenhart dot 106 at osu dot edu
calder.zone
ORCID: 0009-0001-1459-3738
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Education

Graduate Non-Degree

2025 – 2026

Ohio State University

B.S. Physics, Astronomy & Astrophysics

2020 – 2024

Ohio State University

Minor in Mathematics, Minor in History

Magna cum laude, with Research Distinction in Astronomy & Astrophysics

Thesis: Phase-Resolved Cross-Correlation Transmission Spectroscopy of KELT-20b

Publications

Journal Articles

[1] C. Lenhart, M. C. Johnson, J. Wang, A. P. Asnodkar, S. Petz, A. Duck, K. G. Strassmeier, and I. Ilyin. "PEPSI Investigation, Retrieval, and Atlas of Numerous Giant Atmospheres (PIRANGA). II. Phase-resolved Cross-correlation Transmission Spectroscopy of KELT-20b." AJ 171.2 (Jan. 2026). DOI

[2] C. Basinger, M. C. Johnson, J. Wang, A. Duck, A. Pai Asnodkar, S. Petz, C. Lenhart, I. Ilyin, and K. Strassmeier. "PEPSI investigation, retrieval, and atlas of numerous giant atmospheres (PIRANGA) – III. Composition and winds in the atmosphere of TOI-1518 b." MNRAS 543.4 (Sept. 2025). DOI

[3] V. Bonidie, M. C. Johnson, J. Wang, S. Petz, J. Kamen, C. Lenhart, A. Duck, C. Badenes, K. Strassmeier, and I. Ilyin. "PEPSI Investigation, Retrieval, and Atlas of Numerous Giant Atmospheres (PIRANGA). IV. High-resolution Phased-resolved Spectroscopy of the Ultra-hot-Jupiter KELT-20 b." AJ 171.1 (Dec. 2025). DOI

Conference Abstracts

[1] C. Basinger, M. C. Johnson, J. Wang, A. Duck, A. Pai Asnodkar, S. Petz, C. Lenhart, and K. Strassmeier. "Composition and Winds in the Atmosphere of TOI-1518 b." AAS Meeting Abstracts 247 (Feb. 2026).

[2] J. Kamen, M. C. Johnson, V. Bonidie, S. Petz, C. Lenhart, J. Wang, and K. Strassmeier. "Chemistry and dynamics from high-resolution emission spectra of the ultra-hot Jupiters KELT-20b and TOI-1518b from the PIRANGA project." AAS Meeting Abstracts 247 (Feb. 2026).

[3] C. Lenhart, M. Johnson, S. Petz, J. Wang, A. Pai Asnodkar, K. Strassmeier, and I. Ilyin. "Analysis of KELT-20b's Atmospheric Dynamics Using PEPSI: Line Profiles During Transit and Velocity Offsets." AAS Meeting Abstracts 243 (Feb. 2024).

Theses

[1] C. Lenhart. "Phase-Resolved Cross-Correlation Transmission Spectroscopy of KELT-20b." Undergraduate Research Thesis. The Ohio State University, Dec. 2024.

TNS Discovery Reports

[1] K. Z. Stanek and C. Lenhart. "ASAS-SN Transient Discovery Report for AT 2026lru / ASASSN-26df." Transient Name Server (May 2026).

Presentations

Talks

July 2023

"Analysis of an Ultra-Hot Jupiter's Atmosphere." OSU Department of Astronomy Summer Undergraduate Research Program Symposium, Columbus, OH.

Posters

January 2024

"Analysis of KELT-20b's Atmospheric Dynamics Using PEPSI: Line Profiles During Transit and Velocity Offsets." 243rd AAS Meeting, New Orleans, LA.

Awards & Grants

Research Experience

2025– ASAS-SN Analyst, Department of Astronomy, OSU (Advisors: Prof. C. Kochanek, Prof. K. Stanek)

2023– Exoplanet Researcher, Department of Astronomy, OSU (Advisor: Dr. M. C. Johnson, Co-advisor: Prof. J. Wang)

2022–2023 Undergraduate Research Assistant, Department of Materials Science and Engineering, OSU (Advisor: Prof. S. Akbar)

Work Experience

2025– Research Technician I, OSU Department of Astronomy (Prof. C. Kochanek, Prof. K. Stanek)

2025 Physics AI Trainer, Mercor Intelligence

2022–2023 Private Tutor, Grade Potential Tutoring & Wyzant

2021–2022 Math Tutor, OSU Mathematics and Statistics Learning Center

Projects

2026– rmdc26 — GitHub

2026– mlexo — GitHub

2026– atmo-retrieval — GitHub

2026– exoJAX — GitHub

2025– malca — GitHub

2023 Machine Learning: Linking Writing Processes to Writing Quality — GitHub

2023 Make OHI/O Makeathon — 1st Place (Intel Challenge)

2021–2022 Buckeye Solar Racing, Aerodynamics Team

2021 NASA L'SPACE Mission Concept Academy, Engineering Team Lead