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Accepted manuscript

Untapped: Veloce Detects Calcium in the Atmosphere of WASP-189b

Published online by Cambridge University Press:  25 September 2025

Nicholas W. Borsato*
Affiliation:
School of Mathematical and Physical Sciences, Macquarie University, Sydney, NSW 2109, Australia Astrophysics and Space Technologies Research Centre, Macquarie University, Sydney, NSW 2109, Australia Lund Observatory, Division of Astronomy and Theoretical Physics, Lund University, Box 43, 221 00 Lund, Sweden
Joachim Krüger
Affiliation:
Centre for Astrophysics, University of Southern Queensland, Toowoomba, QLD 4350, Australia
Daniel B. Zucker
Affiliation:
School of Mathematical and Physical Sciences, Macquarie University, Sydney, NSW 2109, Australia Astrophysics and Space Technologies Research Centre, Macquarie University, Sydney, NSW 2109, Australia
Simon J. Murphy
Affiliation:
Centre for Astrophysics, University of Southern Queensland, Toowoomba, QLD 4350, Australia
Duncan Wright
Affiliation:
Centre for Astrophysics, University of Southern Queensland, Toowoomba, QLD 4350, Australia
Sarah L. Martell
Affiliation:
School of Physics, University of New South Wales, Sydney, NSW 2052, Australia
*
Author for correspondence: Nicholas W. Borsato, Email: nicholas.borsato@hdr.mq.edu.au.
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Abstract

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High-resolution transmission spectroscopy has become a powerful tool for detecting atomic and ionic species in the atmospheres of ultra-hot Jupiters. In this study, we demonstrate for the first time that the Australian-built Veloce spectrograph on the 3.9-m Anglo-Australian Telescope can resolve atmospheric signatures from transiting exoplanets. We observed a single transit of the ultra-hot Jupiter WASP-189b—a favourable target given its extreme irradiation and bright host star—and applied the cross-correlation technique using standardised templates. We robustly detect ionised calcium (Ca+), and find evidence for hydrogen (H), sodium (Na), magnesium (Mg), neutral calcium (Ca), titanium (Ti), ionised titanium (Ti+), ionised iron (Fe+), neutral iron (Fe), and ionised strontium (Sr+). The strongest detection was achieved in the red arm of Veloce, consistent with expectations due to the prominent Ca+ triplet at wavelengths around 850–870 nm. Our results validate Veloce’s capability for high-resolution atmospheric studies, highlighting it as an accessible, flexible facility to complement larger international telescopes. If future observations stack multiple transits, Veloce has the potential to reveal atmospheric variability, phase-dependent spectral changes, and detailed chemical compositions of highly irradiated exoplanets.

Information

Type
PASA Letters
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Astronomical Society of Australia