Assessing Earth’s atmospheric impact on near-infrared radial velocity measurements with IRD/Subaru

Yui Kasagi; Takayuki Kotani; Teruyuki Hirano; Masayuki Kuzuhara; Masashi Omiya; Takuya Takarada; Hiroki Harakawa; Tomoyuki Kudo; Jun Nishikawa; Motohide Tamura; Bun'ei Sato

doi:10.1117/12.3019372

18 July 2024 Assessing Earth’s atmospheric impact on near-infrared radial velocity measurements with IRD/Subaru

Yui Kasagi, Takayuki Kotani, Teruyuki Hirano, Masayuki Kuzuhara, Masashi Omiya, Takuya Takarada, Hiroki Harakawa, Tomoyuki Kudo, Jun Nishikawa, Motohide Tamura, Bun'ei Sato

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130962C (2024) https://doi.org/10.1117/12.3019372
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We assessed the impact of Earth’s atmospheric absorption lines, known as telluric contamination, on near-infrared radial velocity (RV) measurements using IRD/Subaru. We focused on the telluric removal process implemented in the RV pipeline for IRD data, which works in two phases: the creation of a stellar template spectrum and the measurement of RVs through a forward modeling approach. Our analysis revealed that discrepancies of approximately 1% exist between the observed telluric standard star’s spectra and theoretical telluric spectra, both used within the RV pipeline. These discrepancies are particularly significant in regions with strong water vapor absorption. Additionally, we investigated the impacts of residual tellurics on RV measurements through mock spectrum analysis. By comparing RV values derived from mock spectra made with either theoretical or observed tellurics, we found that residual tellurics can introduce an additional scatter of at least 1 m/s in RV measurements. Our findings highlight the necessity for improved telluric removal methods in the near-infrared spectrum to achieve precise RV measurements critical for detecting small-mass planets.

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Yui Kasagi, Takayuki Kotani, Teruyuki Hirano, Masayuki Kuzuhara, Masashi Omiya, Takuya Takarada, Hiroki Harakawa, Tomoyuki Kudo, Jun Nishikawa, Motohide Tamura, and Bun'ei Sato "Assessing Earth’s atmospheric impact on near-infrared radial velocity measurements with IRD/Subaru", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130962C (18 July 2024); https://doi.org/10.1117/12.3019372

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