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1826217509099929600
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MIT
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<jats:title>ABSTRACT</jats:title>
<jats:p>We report the discovery of HD 110113 b (TESS object of interest-755.01), a transiting mini-Neptune exoplanet on a 2.5-d orbit around the solar-analogue HD 110113 (Teff = 5730 K). Using TESS photometry and High Accuracy Radial velocity Planet Searcher (HARPS) radial velocities gathered by the NCORES program, we find that HD 110113 b has a radius of 2.05 ± 0.12 R⊕ and a mass of 4.55 ± 0.62 M⊕. The resulting density of $2.90^{+0.75}_{-0.59}$ g cm−3 is significantly lower than would be expected from a pure-rock world; therefore HD 110113 b must be a mini-Neptune with a significant volatile atmosphere. The high incident flux places it within the so-called radius valley; however, HD 110113 b was able to hold on to a substantial (0.1–1 per cent) H–He atmosphere over its ∼4 Gyr lifetime. Through a novel simultaneous Gaussian process fit to multiple activity indicators, we were also able to fit for the strong stellar rotation signal with period 20.8 ± 1.2 d from the RVs and confirm an additional non-transiting planet, HD 110113 c, which has a mass of 10.5 ± 1.2 M⊕ and a period of $6.744^{+0.008}_{-0.009}$ d.</jats:p>
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2024-09-23T17:04:44Z
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Article
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mit-1721.1/135590
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Massachusetts Institute of Technology
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| language |
English
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2024-09-23T17:04:44Z
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2021
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Oxford University Press (OUP)
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dspace
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mit-1721.1/1355902022-04-01T17:47:10Z A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113 <jats:title>ABSTRACT</jats:title> <jats:p>We report the discovery of HD 110113 b (TESS object of interest-755.01), a transiting mini-Neptune exoplanet on a 2.5-d orbit around the solar-analogue HD 110113 (Teff = 5730 K). Using TESS photometry and High Accuracy Radial velocity Planet Searcher (HARPS) radial velocities gathered by the NCORES program, we find that HD 110113 b has a radius of 2.05 ± 0.12 R⊕ and a mass of 4.55 ± 0.62 M⊕. The resulting density of $2.90^{+0.75}_{-0.59}$ g cm−3 is significantly lower than would be expected from a pure-rock world; therefore HD 110113 b must be a mini-Neptune with a significant volatile atmosphere. The high incident flux places it within the so-called radius valley; however, HD 110113 b was able to hold on to a substantial (0.1–1 per cent) H–He atmosphere over its ∼4 Gyr lifetime. Through a novel simultaneous Gaussian process fit to multiple activity indicators, we were also able to fit for the strong stellar rotation signal with period 20.8 ± 1.2 d from the RVs and confirm an additional non-transiting planet, HD 110113 c, which has a mass of 10.5 ± 1.2 M⊕ and a period of $6.744^{+0.008}_{-0.009}$ d.</jats:p> 2021-10-27T20:24:09Z 2021-10-27T20:24:09Z 2021 2021-09-27T17:55:40Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/135590 en 10.1093/MNRAS/STAB182 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 |
A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
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| title |
A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
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| title_full |
A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
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| title_fullStr |
A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
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| title_full_unstemmed |
A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
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| title_short |
A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
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| title_sort |
hot mini neptune in the radius valley orbiting solar analogue hd 110113
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| url |
https://hdl.handle.net/1721.1/135590
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