Optimising Radial Velocity Detection Limits for Southern Habitable Worlds Observatory Targets
The planned NASA Habitable Worlds Observatory (HWO) flagship mission aims to image and spectroscopically characterise 25 Earth-size planets in the habitable zones of their stars.
However, one giant planet in the habitable zone can ruin your whole day. Recent work has examined the current state of our knowledge on the presence or absence of such objects in samples of likely HWO targets, and that knowledge has been found wanting; even Saturn-mass planets remain undetectable in many of these systems.
In this work, we present simulations assessing the degree to which new campaigns of high-cadence radial velocity observations can ameliorate this woeful state of affairs. In particular, we highlight the value of moderate-precision but highly flexibly-scheduled RV facilities in aiding this necessary HWO precursor science.
We find that for a subset of Southern HWO stars, 6 years of new RVs from the Minerva-Australis telescope array in Australia can improve the median detection sensitivity in the habitable zones of 13 likely HWO targets to ∼50 Earth masses, an improvement of ∼44%.
Robert A. Wittenmyer, Adriana Errico, Timothy R. Holt, Jonathan Horner, Caleb K. Harada, Stephen R. Kane, Zhexing Li, Tara Fetherolf
Comments: Accepted for publication in MNRAS
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2503.20121 [astro-ph.EP] (or arXiv:2503.20121v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2503.20121
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Submission history
From: Robert Wittenmyer
[v1] Wed, 26 Mar 2025 00:01:05 UTC (532 KB)
https://arxiv.org/abs/2503.20121
Astrobiology,
