Format:
22
ISSN:
1432-0746
Content:
We report the discovery of a Neptune-like planet located in the “hot Neptune desert”. Confirmation of the TESS Object of Interest (TOI 442.01) was achieved with radial-velocity follow-up using CARMENES, ESPRESSO, HIRES, iSHELL, and PFS, as well as from photometric data using TESS, 〈i〉Spitzer〈i/〉, and ground-based photometry from MuSCAT2, TRAPPIST-South, MONET-South, the George Mason University telescope, the Las Cumbres Observatory Global Telescope network, the El Sauce telescope, the TÜBİTAK National Observatory, the University of Louisville Manner Telescope, and WASP-South. We also present high-spatial resolution adaptive optics imaging with the Gemini Near-Infrared Imager. The low uncertainties in the mass and radius determination place LP 714-47 b among physically well-characterised planets, allowing for a meaningful comparison with planet structure models. The host star LP 714-47 is a slowly rotating early M dwarf (〈i〉T〈i/〉〈sub〉eff〈sub/〉 = 3950 ± 51 K) with a mass of 0.59 ± 0.02〈i〉M〈i/〉〈sub〉⊙〈sub/〉 and a radius of 0.58 ± 0.02〈i〉R〈i/〉〈sub〉⊙〈sub/〉. From long-term photometric monitoring and spectroscopic activity indicators, we determine a stellar rotation period of about 33 d. The stellar activity is also manifested as correlated noise in the radial-velocity data. In the power spectrum of the radial-velocity data, we detect a second signal with a period of 16 days in addition to the four-day signal of the planet. This could be shown to be a harmonic of the stellar rotation period or the signal of a second planet. It may be possible to tell the difference once more TESS data and radial-velocity data are obtained.
Note:
Gesehen am 02.02.2022
In:
Astronomy and astrophysics, Les Ulis : EDP Sciences, 1969, 644(2020) vom: Dez., Artikel-ID A127, Seite 1-22, 1432-0746
In:
volume:644
In:
year:2020
In:
month:12
In:
elocationid:A127
In:
pages:1-22
In:
extent:22
Language:
English
DOI:
10.1051/0004-6361/202038016
URL:
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