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TOI-674b: An oasis in the desert of exo-Neptunes transiting a nearby M dwarf
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 653, pp.A60. ⟨10.1051/0004-6361/202140718⟩, CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET
- Publication Year :
- 2021
- Publisher :
- HAL CCSD, 2021.
-
Abstract
- We use TESS, Spitzer, ground-based light curves and HARPS spectrograph radial velocity measurements to establish the physical properties of the transiting exoplanet candidate TOI-674b. We perform a joint fit of the light curves and radial velocity time series to measure the mass, radius, and orbital parameters of the candidate. We confirm and characterize TOI-674b, a low-density super-Neptune transiting a nearby M dwarf. The host star (TIC 158588995, $V = 14.2$ mag, $J = 10.3$ mag) is characterized by its M2V spectral type with $\mathrm{M}_\star=0.420\pm 0.010$ M$_\odot$, $\mathrm{R}_\star = 0.420\pm 0.013$ R$_\odot$, and $\mathrm{T}_{\mathrm{eff}} = 3514\pm 57$ K, and is located at a distance $d=46.16 \pm 0.03$ pc. Combining the available transit light curves plus radial velocity measurements and jointly fitting a circular orbit model, we find an orbital period of $1.977143 \pm 3\times 10^{-6}$ days, a planetary radius of $5.25 \pm 0.17$ $\mathrm{R}_\oplus$, and a mass of $23.6 \pm 3.3$ $\mathrm{M}_\oplus$ implying a mean density of $\rho_\mathrm{p} = 0.91 \pm 0.15$ [g cm$^{-3}$]. A non-circular orbit model fit delivers similar planetary mass and radius values within the uncertainties. Given the measured planetary radius and mass, TOI-674b is one of the largest and most massive super-Neptune class planets discovered around an M type star to date. It is also a resident of the so-called Neptunian desert and a promising candidate for atmospheric characterisation using the James Webb Space Telescope.<br />Comment: 22 pages, 16 figures. Accepted for publication in A&A
- Subjects :
- 010504 meteorology & atmospheric sciences
GASEOUS PLANETS [PLANETS AND SATELLITES]
FOS: Physical sciences
RADIAL VELOCITIES [TECHNIQUES]
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
purl.org/becyt/ford/1 [https]
Planet
0103 physical sciences
GENERAL [PLANETS AND SATELLITES]
PLANETARY SYSTEMS
010303 astronomy & astrophysics
INDIVIDUAL: TOI-674 [STARS]
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Earth and Planetary Astrophysics (astro-ph.EP)
Physics
Orbital elements
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Astronomy and Astrophysics
Radius
purl.org/becyt/ford/1.3 [https]
PHOTOMETRIC [TECHNIQUES]
Light curve
Orbital period
Exoplanet
Radial velocity
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
Astrophysics::Earth and Planetary Astrophysics
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Planetary mass
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 653, pp.A60. ⟨10.1051/0004-6361/202140718⟩, CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET
- Accession number :
- edsair.doi.dedup.....1b8dbf299b512c0ec69e07c72bfbe688