The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf

2023/05/19 by Taiki Kagetani, Norio Narita, Tadahiro Kimura +41 · 5 citations
Physics and Astronomy · #Stellar, planetary, and galactic studies #Astrophysics and Star Formation Studies #Astro and Planetary Science

paper · pdf · doi:10.1093/pasj/psad031

Abstract

Abstract We report on the determination of the mass of TOI-519 b, a transiting substellar object around a mid-M dwarf. We carried out radial velocity measurements using Subaru/InfraRed Doppler (IRD), revealing that TOI-519 b is a planet with a mass of 0.463^+0.082_-0.088 M_{\rm Jup}. We also found that the host star is metal rich ([Fe/H] = 0.27 ± 0.09 dex) and has the lowest effective temperature (Teff = 3322 ± 49 K) among all stars hosting known close-in giant planets based on the IRD spectra and mid-resolution infrared spectra obtained with NASA Infrared Telescope Facility/SpeX. The core mass of TOI-519 b inferred from a thermal evolution model ranges from 0 to ∼30 M⊕, which can be explained by both core accretion and disk instability models as the formation origins of this planet. However, TOI-519 is in line with the emerging trend that M dwarfs with close-in giant planets tend to have high metallicity, which may indicate that they formed in the core accretion model. The system is also consistent with the potential trend that close-in giant planets around M dwarfs tend to be less massive than those around FGK dwarfs.

Citations

• The CMC15, the last issue of the series “Carlsberg Meridian Catalogue, La Palma”
• Spextool: A Spectral Extraction Package for SpeX, a 0.8–5.5 Micron Cross‐Dispersed Spectrograph
• SpeX: A Medium‐Resolution 0.8–5.5 Micron Spectrograph and Imager for the NASA Infrared Telescope Facility
• emcee : The MCMC Hammer
• The Two Micron All Sky Survey (2MASS)
• The California-Kepler Survey. IV. Metal-rich Stars Host a Greater Diversity of Planets

Cited by

• Metallicity Dependence of Giant Planets around M Dwarfs
• Formation of Giant Planets
• Searching for GEMS: TOI-5916 b & TOI-6158 b are two Saturn-density planets orbiting M2 dwarfs
• Searching for GEMS: The Occurrence of Giant Planets orbiting M-dwarfs within 100 pc
• Aligned Stellar Obliquities for Two Hot Jupiter-hosting M Dwarfs Revealed by MAROON-X: Implications for Hot Jupiter Formation

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