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TOI-3785 b: A Low-density Neptune Orbiting an M2-dwarf Star
- Source :
- The Astronomical Journal, Vol 166, Iss 2, p 44 (2023)
- Publication Year :
- 2023
- Publisher :
- IOP Publishing, 2023.
-
Abstract
- Using both ground-based transit photometry and high-precision radial velocity spectroscopy, we confirm the planetary nature of TOI-3785 b. This transiting Neptune orbits an M2-Dwarf star with a period of ∼4.67 days, a planetary radius of 5.14 ± 0.16 R _⊕ , a mass of ${14.95}_{-3.92}^{+4.10}$ M _⊕ , and a density of $\rho ={0.61}_{-0.17}^{+0.18}$ g cm ^−3 . TOI-3785 b belongs to a rare population of Neptunes (4 R _⊕ < R _p < 7 R _⊕ ) orbiting cooler, smaller M-dwarf host stars, of which only ∼10 have been confirmed. By increasing the number of confirmed planets, TOI-3785 b offers an opportunity to compare similar planets across varying planetary and stellar parameter spaces. Moreover, with a high-transmission spectroscopy metric of ∼150 combined with a relatively cool equilibrium temperature of T _eq = 582 ± 16 K and an inactive host star, TOI-3785 b is one of the more promising low-density M-dwarf Neptune targets for atmospheric follow up. Future investigation into atmospheric mass-loss rates of TOI-3785 b may yield new insights into the atmospheric evolution of these low-mass gas planets around M dwarfs.
- Subjects :
- Exoplanet astronomy
Radial velocity
Transits
M dwarf stars
Astronomy
QB1-991
Subjects
Details
- Language :
- English
- ISSN :
- 15383881
- Volume :
- 166
- Issue :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- The Astronomical Journal
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.2c2dd7dd0d3e4ab3a49c11f67e6ab539
- Document Type :
- article
- Full Text :
- https://doi.org/10.3847/1538-3881/acd8bf