2017A&A...604A..19O


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET11:41:43

2017A&A...604A..19O - Astronomy and Astrophysics, volume 604A, 19-19 (2017/8-1)

K2-110 b: a massive mini-Neptune exoplanet.

OSBORN H.P., SANTERNE A., BARROS S.C.C., SANTOS N.C., DUMUSQUE X., MALAVOLTA L., ARMSTRONG D.J., HOJJATPANAH S., DEMANGEON O., ADIBEKYAN V., ALMENARA J.-M., BARRADO D., BAYLISS D., BOISSE I., BOUCHY F., BROWN D.J.A., CAMERON A.C., CHARBONNEAU D., DELEUIL M., DELGADO MENA E., DIAZ R.F., HEBRARD G., KIRK J., KING G.W., LAM K.W.F., LATHAM D., LILLO-BOX J., LOUDEN T.M., LOVIS C., MARMIER M., McCORMAC J., MOLINARI E., PEPE F., POLLACCO D., SOUSA S.G., UDRY S. and WALKER S.R.

Abstract (from CDS):

We report the discovery of the exoplanet K2-110 b (previously EPIC212521166b) from K2 photometry orbiting in a 13.8637d period around an old, metal-poor K3 dwarf star. With a V-band magnitude of 11.9, K2-110 is particularly amenable to RV follow-up. A joint analysis of K2 photometry and high-precision RVs from 28 HARPS and HARPS-N spectra reveal it to have a radius of 2.6±0.1R and a mass of 16.7±3.2M, hence a density of 5.2±1.2g/cm3, making it one of the most massive planets yet to be found with a sub-Neptune radius. When accounting for compression, the resulting Earth-like density is best fitted by a 0.2M hydrogen atmosphere over an 16.5M Earth-like interior, although the planet could also have significant water content. At 0.1 AU, even taking into account the old stellar age of 8±3Gyr, the planet is unlikely to have been significantly affected by EUV evaporation. However the planet likelydisc-migrated to its current position making the lack of a thick H2 atmosphere puzzling. This analysis has made K2-110 b one of the best-characterised mini-Neptunes with density constrained to less than 30%.

Abstract Copyright: © ESO, 2017

Journal keyword(s): planets and satellites: detection - planets and satellites: detection

Simbad objects: 4

goto Full paper

goto View the reference in ADS

Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 K2-110 PM* 13 49 23.8899341110 -12 17 04.122532532   12.83 11.91 11.79 10.92 K2V 14 0
2 K2-110b Pl 13 49 23.8899341110 -12 17 04.122532532           ~ 15 0
3 Kepler-10c Pl 19 02 43.0612302512 +50 14 28.700759378           ~ 103 1
4 Kepler-11 Ro* 19 48 27.6228219845 +41 54 32.902654079       14.00   G2V 302 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2017A&A...604A..19O and select 'bookmark this link' or equivalent in the popup menu


2021.01.27-11:41:43

© Université de Strasbourg/CNRS

    • Contact