An Early Look at the Performance of IGRINS-2 at Gemini-North with Application to the Ultrahot Jupiter, WASP-33 b

Abstract Ground-based high-resolution spectroscopy enables precise molecular detections and velocity-resolved atmospheric dynamics, offering a distinct advantage over low-resolution methods for exoplanetary atmospheric studies. Immersion GRating INfrared Spectrograph 2 (IGRINS-2), the successor to IGRINS, features improved throughput and enhanced sensitivity to carbon monoxide by shifting its K -band coverage by 36 nm to longer wavelengths. IGRINS is a near-infrared high-resolution spectrograph mounted at McDonald, Lowell, and Gemini-South observatories. Our order-drop test shows this added range improves the CO cross-correlation signal-to-noise ratio (SNR) by ∼2%–3%, confirming a measurable but modest sensitivity gain. To evaluate its performance, we attempt to investigate the atmospheric characteristics of WASP-33 b. Observations were conducted on 2024 January 7 for a total of 2.43 hr; This includes 1.46 hr in the pre-eclipse phase to capture the planet’s thermal emission spectrum. We successfully detect clear cross-correlation signals from molecular species in the dayside atmosphere of WASP-33 b with a combined SNR of 7.4. More specifically, we capture CO, H 2 O, and OH with SNRs of 6.3, 4.7, and 4.2, respectively. These results are consistent with previous studies and demonstrate that IGRINS-2 is well suited for detailed investigation of exoplanetary atmospheres. We anticipate that future observations with IGRINS-2 will further advance our understanding of exoplanetary atmospheres.

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Publication Details

Journal
The Astronomical Journal
Published
2025-09-24
DOI
https://doi.org/10.3847/1538-3881/aded8c
Citations
1
Primary Topic
Astro and Planetary Science
Type
article
Field-Weighted Citation Impact
1.15
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article

An Early Look at the Performance of IGRINS-2 at Gemini-North with Application to the Ultrahot Jupiter, WASP-33 b

Ueejeong Jeong, Young-Sam Yu, Jorge Abril Sánchez, Yunjong Kim et al.
1 citations
The Astronomical Journal
Astro and Planetary Science
1.15
article

An Early Look at the Performance of IGRINS-2 at Gemini-North with Application to the Ultrahot Jupiter, WASP-33 b

Ueejeong Jeong, Young-Sam Yu, Jorge Abril Sánchez, Yunjong Kim, Andres Olivares, Gregory N. Mace, Andrew W. Stephens, Peter Smith, Francisco Ramos, Hyewon Suh, Byeong‐Cheol Lee, Ignacio Arriagada, Rubén Díaz, Carlos Quiroz, Charlie Figura, D. T. Jaffe, Bi-Ho Jang, Byeong-Gon Park, Changwoo Kye, Luke Finnerty, In-Soo Yuk, S. Lee, Heeyoung Oh, Eduardo Tapia, Narae Hwang, Teo Močnik, Hanshin Lee, Hwihyun Kim, Zachary Hartman, Kathleen Labrie, Emanuele Paolo Farina, Brian Chinn, Mark G. Rawlings, Sanghyuk Kim, Siyi Xu, Bryan W. Miller, T. L. Hayward, Cynthia B. Brooks, Michael R. Line, Hawi Stecher, Krishna Kanumalla, Chan Park, Hye-In Lee, Hyun-Jeong Kim, Woojin Park, Jae‐Joon Lee, John White, John M. Good, Pablo Prado, Valentina Oyarzún, Y. Choi, Moo-Young Chun, Paul Hirst, Jeong-Gyun Jang, Hyeon Cheol Seong, Jae Sok Oh, Emma Kurz, Jen Miller, Kang-Min Kim
article en
1 citations

Abstract

Abstract Ground-based high-resolution spectroscopy enables precise molecular detections and velocity-resolved atmospheric dynamics, offering a distinct advantage over low-resolution methods for exoplanetary atmospheric studies. Immersion GRating INfrared Spectrograph 2 (IGRINS-2), the successor to IGRINS, features improved throughput and enhanced sensitivity to carbon monoxide by shifting its K -band coverage by 36 nm to longer wavelengths. IGRINS is a near-infrared high-resolution spectrograph mounted at McDonald, Lowell, and Gemini-South observatories. Our order-drop test shows this added range improves the CO cross-correlation signal-to-noise ratio (SNR) by ∼2%–3%, confirming a measurable but modest sensitivity gain. To evaluate its performance, we attempt to investigate the atmospheric characteristics of WASP-33 b. Observations were conducted on 2024 January 7 for a total of 2.43 hr; This includes 1.46 hr in the pre-eclipse phase to capture the planet’s thermal emission spectrum. We successfully detect clear cross-correlation signals from molecular species in the dayside atmosphere of WASP-33 b with a combined SNR of 7.4. More specifically, we capture CO, H 2 O, and OH with SNRs of 6.3, 4.7, and 4.2, respectively. These results are consistent with previous studies and demonstrate that IGRINS-2 is well suited for detailed investigation of exoplanetary atmospheres. We anticipate that future observations with IGRINS-2 will further advance our understanding of exoplanetary atmospheres.

The Astronomical JournalVol. 170(4)
Openalex Percentile: Top 16%
Astro and Planetary Science
1.15
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