J/MNRAS/499/5004 K2-111, an old system with two planets (Mortier+, 2020)
K2-111: an old system with two planets in near-resonance.
Mortier A., Zapatero Osorio M.R., Malavolta L., Alibert Y., Rice K.,
Lillo-box J., Vanderburg A., Oshagh M., Buchhave L., Adibekyan V.,
Delgado Mena E., Lopez-morales M., Charbonneau D., Sousa S.G., Lovis C.,
Affer L., Allende Prieto C., Barros S.C.C., Benatti S., Bonomo A.S.,
Boschin W., Bouchy F., Cabral A., Collier Cameron A., Cosentino R.,
Cristiani S., Demangeon O.D.S., Di Marcantonio P., D'odorico V.,
Dumusque X., Ehrenreich D., Figueira P., Fiorenzano A., Ghedina A.,
Gonzalez Hernandez J.I., Haldemann J., Harutyunyan A., Haywood R.D.,
Latham D.W., Lavie B., Lo Curto G., Maldonado J., Manescau A.,
Martins C.J.A.P., Mayor M., Megevand D., Mehner A., Micela G., Molaro P.,
Molinari E., Nunes N.J., Pepe F.A., Palle E., Phillips D., Piotto G.,
Pinamonti M., Poretti E., Riva M., Rebolo R., Santos N.C., Sasselov D.,
Sozzetti A., Suarez Mascareno A., Udry S., West R.G., Watson C.A.,
Wilson T.G.
<Mon. Not. R. Astron. Soc., 499, 5004-5021 (2020)>
=2020MNRAS.499.5004M 2020MNRAS.499.5004M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, G-type ; Exoplanets ; Photometry ; Radial velocities
Keywords: planets and satellites: detection - stars: individual (K2-111) -
techniques: photometric - techniques: radial velocities -
techniques: spectroscopic
Abstract:
This paper reports on the detailed characterisation of the K2-111
planetary system with K2, WASP, and ASAS-SN photometry as well as
high-resolution spectroscopic data from HARPS-N and ESPRESSO. The
host, K2-111, is confirmed to be a mildly evolved (logg=4.17),
iron-poor ([Fe/H]=-0.46), but alpha-enhanced ([α/Fe]=0.27),
chromospherically quiet, very old thick disc G2 star. A global fit,
performed by using PyORBIT shows that the transiting planet, K2-111 b,
orbits with a period Pb=5.3518±0.0004d, and has a planet
radius of 1.82+0.11-0.09R⊕ and a mass of
5.29+0.76-0.77 M⊕, resulting in a bulk density slightly
lower than that of the Earth. The stellar chemical composition and the
planet properties are consistent with K2-111 b being a terrestrial
planet with an iron core mass fraction lower than the Earth. We
announce the existence of a second signal in the radial velocity data
that we attribute to a non-transiting planet, K2-111 c, with an
orbital period of 15.6785±0.0064 days, orbiting in near-3:1
mean-motion resonance with the transiting planet, and a minimum planet
mass of 11.3±1.1 M⊕. Both planet signals are independently
detected in the HARPS-N and ESPRESSO data when fitted separately.
There are potentially more planets in this resonant system, but more
well-sampled data are required to confirm their presence and physical
parameters.
Description:
tablerv.dat contains the radial velocities and activity indicators
from K2-111 obtained by HARPS-N and ESPRESSO.
tablep1.dat contains the photometry for K2-111 from K-2, used for the
transit fit.
tablep2.dat contains the photometry for K2-111 from WASP, and ASAS-SN,
used to assess stellar variability.
Objects:
-------------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------------
03 59 33.54 +21 17 55.2 K2-111 = EPIC 210894022
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablerv.dat 121 154 Radial velocity and activity indicators of K2-111
tablep1.dat 33 3168 K2 photometry of K2-111
tablep2.dat 45 23184 WASP and ASAS-SN photometry of K2-111
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Byte-by-byte Description of file: tablerv.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Inst Instrument (ESPRESSO or HARPS-N)
11- 22 F12.4 d BJD Barycentric Julian date
25- 32 F8.4 km/s RV Radial velocity
35- 40 F6.4 km/s e_RV Error on radial velocity
43- 48 F6.4 km/s FWHM Full-width-at-half-maximum of the CCF
51- 56 F6.4 km/s e_FWHM Error on the FWHM
59- 64 F6.4 --- Ha H alpha index
67- 72 F6.4 --- e_Ha Error on the H alpha index
75- 80 F6.4 --- Na Sodium ID index
83- 88 F6.4 --- e_Na Error on the Sodium ID index
91- 96 F6.4 --- SMW Mount Wilson S index
99-104 F6.4 --- e_SMW Error on the Mount Wilson S index
107-113 F7.4 --- RHK log R'HK
116-121 F6.4 --- e_RHK Error on the log R'HK
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Byte-by-byte Description of file: tablep1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d JD Julian Date
15- 23 F9.7 --- Flux Normalised and flattened flux
26- 33 F8.6 --- e_Flux Error on the normalised and flattened flux
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Byte-by-byte Description of file: tablep2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d JD Julian Date
15- 23 F9.7 --- Flux Normalised flux
26- 34 F9.7 --- e_Flux Error on the normalised flux
37- 45 A9 --- Inst Instrument (WASP, ASAS-SN V or ASAS-SN g)
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Acknowledgements:
Annelies Mortier, angm2(at)cam.ac.uk
(End) Annelies Mortier [Univ. of Cambridge], Patricia Vannier [CDS] 11-Dec-2020