Exoplanets & Exomoons

A Perfect Tidal Storm: HD 104067 Planetary Architecture Creating an Incandescent World

By Keith Cowing
Status Report
May 12, 2024
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A Perfect Tidal Storm: HD 104067 Planetary Architecture Creating an Incandescent World
Results of the injection-recovery test to determine the sensitivity of the RV data to planetary signatures as a function of planetary mass (Mp sin i) and semi-major axis (a). The blue dots represent injected planetary signatures that were successfully recovered and the red dots represent those planets that were not recovered. The color scale shown on the right vertical axis corresponds to the probability contours of detecting a planet of a given mass and semi-major axis. The two detected planets are shown as large black dots. astro-ph.EP

The discovery of planetary systems beyond the solar system has revealed a diversity of architectures, most of which differ significantly from our system.

The initial detection of an exoplanet is often followed by subsequent discoveries within the same system as observations continue, measurement precision is improved, or additional techniques are employed. The HD 104067 system is known to consist of a bright K dwarf host star and a giant planet in a ∼55 day period eccentric orbit.

Here we report the discovery of an additional planet within the HD 104067 system, detected through the combined analysis of radial velocity data from the HIRES and HARPS instruments. The new planet has a mass similar to Uranus and is in an eccentric ∼14 day orbit. Our injection-recovery analysis of the radial velocity data exclude Saturn-mass and Jupiter-mass planets out to 3 AU and 8 AU, respectively.

We further present TESS observations that reveal a terrestrial planet candidate (Rp=1.30±0.12 R) in a ∼2.2~day period orbit. Our dynamical analysis of the three planet model shows that the two outer planets produce significant eccentricity excitation of the inner planet, resulting in tidally induced surface temperatures as high as ∼2600 K for an emissivity of unity.

The terrestrial planet candidate may therefore be caught in a tidal storm, potentially resulting in its surface radiating at optical wavelengths.

Stephen R. Kane, Tara Fetherolf, Zhexing Li, Alex S. Polanski, Andrew W. Howard, Howard Isaacson, Teo Močnik, Sadie G. Welter

Comments: 16 pages, 7 figures, 3 tables, accepted for publication in the Astronomical Journal
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:2403.17062 [astro-ph.EP] (or arXiv:2403.17062v1 [astro-ph.EP] for this version)
Submission history
From: Stephen Kane
[v1] Mon, 25 Mar 2024 18:00:14 UTC (2,062 KB)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻