2014A&A...572A.109D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:54:59

2014A&A...572A.109D - Astronomy and Astrophysics, volume 572A, 109-109 (2014/12-1)

SOPHIE velocimetry of Kepler transit candidates. XIII. KOI-89 b and KOI-86 b: two very low-mass stars in long-period orbits.

DIAZ R.F., MONTAGNIER G., LECONTE J., BONOMO A.S., DELEUIL M., ALMENARA J.M., BARROS S.C.C., BOUCHY F., BRUNO G., DAMIANI C., HEBRARD G., MOUTOU C. and SANTERNE A.

Abstract (from CDS):

We present the radial-velocity follow-up of two Kepler planetary transiting candidates (KOI-89 and KOI-86) carried out with the SOPHIE spectrograph at the Observatoire de Haute Provence. These data promptly discard these objects as viable planet candidates and show that the transiting objects are in the regime of very low-mass stars, where a strong discrepancy between observations and models persists for the mass and radius parameters. By combining the SOPHIE spectra with the Kepler light curve and photometric measurements found in the literature, we obtain a full characterization of the transiting companions, their orbits, and their host stars. The two companions are in significantly eccentric orbits with relatively long periods (30 days and 52.5 days), which makes them suitable objects for a comparison with theoretical models, since the effects invoked to understand the discrepancy with observations are weaker for these orbital distances. KOI-89 b has a mass M=0.0745±0.0033M and a radius R=0.1025±0.0024R. The density of KOI-89 b is significantly lower than expected from theoretical models for a system of its age. We explore possible explanations for this difference. KOI-89 b is the smallest hydrogen-burning star with such a precise determination of its fundamental parameters. KOI-86 b is larger and more massive (M=0.0915±0.0043M; R=0.1201±0.0033R), and its position in the mass-radius diagram agrees well with theoretical expectations.

Abstract Copyright:

Journal keyword(s): techniques: photometric - techniques: radial velocities - stars: low-mass - stars: fundamental parameters - stars: individual: KIC11391018 - stars: individual: KIC7906882

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 KELT-1b Pl 00 01 26.9169325133 +39 23 01.782142922           ~ 61 0
2 WASP-1 V* 00 20 40.0746033057 +31 59 23.953709844   12.06 11.31     F7V 105 1
3 BD+57 793b Pl 04 21 52.7044170433 +57 49 01.892074012           ~ 172 1
4 CoRoT-15b BD? 06 28 27.8204 +06 11 10.477   17.012 15.997 15.807   ~ 32 1
5 V* V816 Car Al* 11 06 51.087 -61 11 10.45     16.161 16.07 15.05 FV+MV 27 1
6 V* V817 Car Al* 11 06 51.8852934369 -60 51 45.901317321     16.809   15.61 ~ 31 1
7 V* CM Dra BY* 16 34 20.3299130309 +57 09 44.365524588   14.50 12.87 10.85 9.26 M4.5V 403 0
8 Kepler-486b Pl 18 59 31.1991510825 +49 16 01.170776185           ~ 20 0
9 Kepler-486 Ro* 18 59 31.1991510825 +49 16 01.170776185           ~ 39 0
10 CoRoT-3b Pl 19 28 13.2642482783 +00 07 18.614302248           ~ 114 1
11 KOI-415b Pl? 19 33 13.4495838492 +41 36 22.965658614           ~ 27 0
12 Kepler-492b Pl 19 41 59.1967192074 +42 32 16.400829033           ~ 24 0
13 KOI-686b Pl? 19 47 21.7811821610 +43 38 49.525665721           ~ 22 0
14 KOI-686 EB* 19 47 21.7811821610 +43 38 49.525665721           ~ 39 0
15 Kepler-39b Pl 19 47 50.4745660177 +46 02 03.499173435           ~ 46 1
16 KOI-126 EB* 19 49 54.2016304154 +41 06 51.427612209           ~ 81 1
17 WASP-30b BD? 23 53 38.054 -10 07 05.12           ~ 32 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:54:59

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