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TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M dwarf host
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TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M dwarf host
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TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M dwarf host
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Paper
TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M dwarf host
2021
Overview
We confirm the planetary nature of TOI-532b, using a combination of precise near-infrared radial velocities with the Habitable-zone Planet Finder, TESS light curves, ground based photometric follow-up, and high-contrast imaging. TOI-532 is a faint (J\\(\\sim 11.5\\)) metal-rich M dwarf with Teff = \\(3957\\pm69\\) K and [Fe/H] = \\(0.38\\pm0.04\\); it hosts a transiting gaseous planet with a period of \\(\\sim 2.3\\) days. Joint fitting of the radial velocities with the TESS and ground-based transits reveal a planet with radius of \\(5.82\\pm0.19\\) R\\(_{\\oplus}\\), and a mass of \\(61.5_{-9.3}^{+9.7}\\) M\\(_{\\oplus}\\). TOI-532b is the largest and most massive super Neptune detected around an M dwarf with both mass and radius measurements, and it bridges the gap between the Neptune-sized planets and the heavier Jovian planets known to orbit M dwarfs. It also follows the previously noted trend between gas giants and host star metallicity for M dwarf planets. In addition, it is situated at the edge of the Neptune desert in the Radius--Insolation plane, helping place constraints on the mechanisms responsible for sculpting this region of planetary parameter space.
Publisher
Cornell University Library, arXiv.org
Subject
