A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
- Osborn, H
- Armstrong, D
- Adibekyan, V
- Collins, K
- Delgado-Mena, E
- Howell, S
- Hellier, C
- King, G
- Lillo-Box, J
- Nielsen, L
- Otegi, J
- Santos, N
- Ziegler, C
- Anderson, D
- Briceño, C
- Burke, C
- Bayliss, D
- Barrado, D
- Bryant, E
- Brown, D
- Barros, S
- Bouchy, F
- Caldwell, D
- Conti, D
- Díaz, R
- Dragomir, D
- Deleuil, M.
- Demangeon, O
- Dorn, C
- Daylan, T
- Figueira, P
- Helled, R
- Hoyer, S
- Jenkins, J
- Jensen, E
- Latham, D
- Law, N
- Louie, D
- Mann, A
- Osborn, A
- Pollacco, D
- Rodriguez, D
- Rackham, B
- Ricker, G
- Scott, N
- Sousa, S
- Seager, S
- Stassun, K
- Smith, J
- Strøm, P
- Udry, S
- Villaseñor, J
- Vanderspek, R
- West, R
- Wheatley, P
- Winn, J
DOIAbstract
International audienceABSTRACT 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...
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