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TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet

Hellier

TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet Thumbnail


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Abstract

The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here, we present the detection and mass measurement of a small, short-period (˜4 days) transiting planet around the bright (V = 7.9), solar-type star HD 86226 (TOI-652, TIC 22221375), previously known to host a long-period (~1600 days) giant planet. HD 86226c (TOI-652.01) has a radius of 2.16 ± 0.08 R? and a mass of ${7.25}_{-1.12}^{+1.19}$ M?, based on archival and new radial velocity data. We also update the parameters of the longer-period, not-known-to-transit planet, and find it to be less eccentric and less massive than previously reported. The density of the transiting planet is 3.97 g cm-3, which is low enough to suggest that the planet has at least a small volatile envelope, but the mass fractions of rock, iron, and water are not well-constrained. Given the host star brightness, planet period, and location of the planet near both the "radius gap" and the "hot Neptune desert," HD 86226c is an interesting candidate for transmission spectroscopy to further refine its composition.

Citation

Hellier. (2020). TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet. Astronomical Journal, https://doi.org/10.3847/1538-3881/ab9f95

Acceptance Date Jun 22, 2020
Publication Date Aug 3, 2020
Journal Astronomical Journal
Print ISSN 0004-6256
Publisher American Astronomical Society
DOI https://doi.org/10.3847/1538-3881/ab9f95
Publisher URL http://doi.org/10.3847/1538-3881/ab9f95

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