TOI-674b: An oasis in the desert of exo-Neptunes transiting a nearby M dwarf
TOI-674b: An oasis in the desert of exo-Neptunes transiting a nearby M dwarf
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TOI-674b:外海王星沙漠中的绿洲经过附近的 M 矮星
DOI:
10.1051/0004-6361/202140718
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发表时间:
2021
期刊:
影响因子:
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通讯作者:
Murgas F et al.
中科院分区:
文献类型:
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作者:
Murgas F et al.
ContextThe NASA mission TESS is currently doing an all-sky survey from space to detect transiting planets around bright stars. As part of the validation process, the most promising planet candidates need to be confirmed and characterized using follow-up observations.AimsIn this article, our aim is to confirm the planetary nature of the transiting planet candidate TOI-674b using spectroscopic and photometric observations.MethodsWe 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.ResultsWe 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 withM⋆= 0.420 ± 0.010M⊙,R⋆= 0.420 ± 0.013R⊙, andTeff= 3514 ± 57 K; it is located at a distanced= 46.16 ± 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 ± 3 × 10−6days, a planetary radius of 5.25 ± 0.17R⊕, and a mass of 23.6 ± 3.3M⊕implying a mean density ofρp=0.91 ± 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 found in the Neptunian desert, and is a promising candidate for atmospheric characterization using theJames WebbSpace Telescope.
DOI:
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发表时间:
2017
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影响因子:
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作者:
R. Morris;J. Twicken;Jeffrey C. Smith;B. Clarke;J. Jenkins;S. Bryson;F. Girouard;T. Klaus
通讯作者:
T. Klaus
DOI:
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发表时间:
2013-06
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影响因子:
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作者:
E. Jensen
通讯作者:
E. Jensen
DOI:
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发表时间:
2017
期刊:
影响因子:
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作者:
J. Jenkins;P. Tenenbaum;S. Seader;C. Burke;S. McCauliff;Jeffrey C. Smith;J. Twicken;H. Chandrasekaran
通讯作者:
H. Chandrasekaran