Details

Autor(en) / Beteiligte

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

Titel

A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2021-04, Vol.502 (4), p.4842-4857

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2021

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• ABSTRACT 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.