Osborn, HP, Armstrong, DJ, Adibekyan, V, Collins, KA, Delgado-Mena, E, Howell, SB, Hellier, C, King, GW, Lillo-Box, J, Nielsen, LD, Otegi, JF, Santos, NC, Ziegler, C, Anderson, DR, Briceno, C, Burke, C, Bayliss, D, Barrado, D, Bryant, EM, Brown, DJA, Barros, SCC, Bouchy, F, Caldwell, DA, Conti, DM, Diaz, RF, Dragomir, D, Deleuil, M, Demangeon, ODS, Dorn, C, Daylan, T, Figueira, P, Helled, R, Hoyer, S, Jenkins, JM, Jensen, ELN, Latham, DW, Law, N, Louie, DR, Mann, AW, Osborn, A, Pollacco, DL, Rodriguez, DR, Rackham, BV, Ricker, G, Scott, NJ, Sousa, SG, Seager, S, Stassun, KG, Smith, JC, Strom, P, Udry, S, Villasenor, J, Vanderspek, R, West, R, Wheatley, PJ and Winn, JN (2021) A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113. Monthly Notices of the Royal Astronomical Society, 502 (4). 4842 - 4857. ISSN 0035-8711

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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.

Item Type: Article
Additional Information: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Uncontrolled Keywords: planets and satellites: detection; stars: individual: HD110113
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 26 May 2021 10:02
Last Modified: 11 Jun 2021 11:05
URI: https://eprints.keele.ac.uk/id/eprint/9646

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