2018MNRAS.481.1839M

Query : 2018MNRAS.481.1839M

2018MNRAS.481.1839M - Mon. Not. R. Astron. Soc., 481, 1839-1847 (2018/December-1)

K2-263 b: a 50 d period sub-Neptune with a mass measurement using HARPS-N.

MORTIER A., BONOMO A.S., RAJPAUL V.M., BUCHHAVE L.A., VANDERBURG A., ZENG L., LOPEZ-MORALES M., MALAVOLTA L., COLLIER CAMERON A., DRESSING C.D., FIGUEIRA P., NASCIMBENI V., RICE K., SOZZETTI A., WATSON C., AFFER L., BOUCHY F., CHARBONNEAU D., HARUTYUNYAN A., HAYWOOD R.D., JOHNSON J.A., LATHAM D.W., LOVIS C., MARTINEZ FIORENZANO A.F., MAYOR M., MICELA G., MOLINARI E., MOTALEBI F., PEPE F., PIOTTO G., PHILLIPS D., PORETTI E., SASSELOV D., SEGRANSAN D. and UDRY S.

Abstract (from CDS):

This paper reports on the validation and mass measurement of K2-263 b, a sub-Neptune orbiting a quiet G9V star. Using K2 data from campaigns C5 and C16, we find this planet to have a period of 50.818947 ± 0.000094 d and a radius of 2.41 ± 0.12 R⊕. We followed this system with HARPS-N to obtain 67 precise radial velocities (RVs). A combined fit of the transit and radial velocity data reveals that K2-263 b has a mass of 14.8 ± 3.1 M⊕. Its bulk density (5.7–1.4+1.6 g cm–3) implies that this planet has a significant envelope of water or other volatiles around a rocky core. K2-263 b likely formed in a similar way as the cores of the four giant planets in our own Solar System, but for some reason, did not accrete much gas. The planetary mass was confirmed by an independent Gaussian process-based fit to both the RVs and the spectroscopic activity indicators. K2-263 b belongs to only a handful of confirmed K2 exoplanets with periods longer than 40 d. It is among the longest periods for a small planet with a precisely determined mass using RVs.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: photometric - techniques: radial velocities - techniques: spectroscopic - planets and satellites: individual: K2-263b

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 BD+10 1799 Em* 08 26 27.8490900672 +10 04 49.334175156   9.42 8.92     F6 76 0
2 K2-263b Pl 08 38 43.7696110488 +15 40 50.247016824           ~ 19 0
3 K2-263 PM* 08 38 43.7696110488 +15 40 50.247016824           G9V 16 0
4 K2-118b Pl 08 48 30.4546935960 +15 39 21.530490516           ~ 8 0
5 HD 106315b Pl 12 13 53.3962381416 -00 23 36.553445304           ~ 30 0
6 Kepler-131b Pl 19 14 07.4053097208 +40 56 32.328971700           ~ 58 0
7 Kepler-289d Pl 19 49 51.6736237968 +42 52 58.268872164           ~ 27 0

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