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1826199526342393856
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MIT
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<jats:title>ABSTRACT</jats:title>
<jats:p>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 = $8.6 _{ - 1.5 } ^ { + 1.4 }$ and Mc = $11.8 _{ - 3.2 } ^ { + 3.4 }$ 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.</jats:p>
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| first_indexed |
2024-09-23T11:21:21Z
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Article
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mit-1721.1/135661
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Massachusetts Institute of Technology
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| language |
English
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2024-09-23T11:21:21Z
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2021
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Oxford University Press (OUP)
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dspace
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mit-1721.1/1356612022-04-01T17:27:47Z Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260 <jats:title>ABSTRACT</jats:title> <jats:p>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 = $8.6 _{ - 1.5 } ^ { + 1.4 }$ and Mc = $11.8 _{ - 3.2 } ^ { + 3.4 }$ 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.</jats:p> 2021-10-27T20:24:31Z 2021-10-27T20:24:31Z 2021 2021-09-27T18:30:43Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/135661 en 10.1093/mnras/stab1464 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press (OUP) arXiv
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| spellingShingle |
Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
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| title |
Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
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| title_full |
Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
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| title_fullStr |
Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
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| title_full_unstemmed |
Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
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| title_short |
Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
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| title_sort |
hot planets around cool stars two short period mini neptunes transiting the late k dwarf toi 1260
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| url |
https://hdl.handle.net/1721.1/135661
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