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Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260

Georgieva, IY; Persson, CM; Barragán, O; Nowak, G; Fridlund, M; Locci, D; Palle, E; ... Winn, JN; + view all (2021) Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260. Monthly Notices of the Royal Astronomical Society , 505 (4) pp. 4684-4701. 10.1093/mnras/stab1464. Green open access

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Abstract

We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 – a low metallicity K6 V dwarf star. Photometry from Transiting Exoplanet Survey Satellite(TESS) yields radii of Rb = 2.33 ± 0.10 and Rc = 2.82 ± 0.15 R⊕, and periods of 3.13 and 7.49 d for TOI-1260 b and TOI-1260 c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain Mb = 8.6+1.4−1.5 and Mc = 11.8+3.4−3.2 M⊕. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light-curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian process approach. We test the system’s stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the 2–3 R⊕ range.

Type: Article
Title: Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stab1464
Publisher version: https://doi.org/10.1093/mnras/stab1464
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: techniques: photometric, techniques: radial velocities, planets and satellites: atmospheres, planets and satellites: individual: TOI-1260b, c, planets and satellites: composition, stars: low-mass, planetary systems
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10129406
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