File:Cadieux 2022 AJ 164 96.pdf
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[edit]DescriptionCadieux 2022 AJ 164 96.pdf |
English: Exploring the properties of exoplanets near or inside the radius valley provides insight on the transition from the rocky super-Earths to the larger, hydrogen-rich atmosphere mini-Neptunes. Here, we report the discovery of TOI-1452b, a transiting super-Earth (Rp = 1.67 ± 0.07 R⊕) in an 11.1 day temperate orbit (Teq = 326 ± 7 K) around the primary member (H = 10.0, Teff = 3185 ± 50 K) of a nearby visual-binary M dwarf. The transits were first detected by the Transiting Exoplanet Survey Satellite, then successfully isolated between the two 3farcs2 companions with ground-based photometry from the Observatoire du Mont-Mégantic and MuSCAT3. The planetary nature of TOI-1452b was established through high-precision velocimetry with the near-infrared SPIRou spectropolarimeter as part of the ongoing SPIRou Legacy Survey. The measured planetary mass (4.8 ± 1.3 M⊕) and inferred bulk density (${5.6}_{-1.6}^{+1.8}$ g cm−3) is suggestive of a rocky core surrounded by a volatile-rich envelope. More quantitatively, the mass and radius of TOI-1452b, combined with the stellar abundance of refractory elements (Fe, Mg, and Si) measured by SPIRou, is consistent with a core-mass fraction of 18% ± 6% and a water-mass fraction of ${22}_{-13}^{+21}$%. The water world candidate TOI-1452b is a prime target for future atmospheric characterization with JWST, featuring a transmission spectroscopy metric similar to other well-known temperate small planets such as LHS 1140b and K2-18 b. The system is located near Webb's northern continuous viewing zone, implying that is can be followed at almost any moment of the year. |
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https://iopscience.iop.org/article/10.3847/1538-3881/ac7cea https://doi.org/10.3847/1538-3881/ac7cea |
Author | Charles Cadieux et al. |
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Publisher | IOP Publishing |
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Software used | IOPP |
File change date and time | 15:03, 10 August 2022 |
Date and time of digitizing | 15:02, 10 August 2022 |
Date metadata was last modified | 15:03, 10 August 2022 |
Copyright status | Copyrighted |
Identifier | http://dx.doi.org/10.3847/1538-3881/ac7cea |
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Page size | 612 x 792 pts (letter) |
Version of PDF format | 1.7 |
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