2013A&A...555A.108M


Query : 2013A&A...555A.108M

2013A&A...555A.108M - Astronomy and Astrophysics, volume 555A, 108-108 (2013/7-1)

Kepler observations of very low-mass stars.

MARTIN E.L., CABRERA J., MARTIOLI E., SOLANO E. and TATA R.

Abstract (from CDS):

Observations of very low-mass stars with Kepler represent an excellent opportunity to search for planetary transits and to characterize optical photometric variability at the cool end of the stellar mass distribution. In this paper, we present low-resolution red optical spectra that allow us to identify 18 very low-mass stars that have Kepler light curves available in the public archive. Spectral types of these targets are found to lie in the range dM4.5-dM8.5, implying spectrophotometric distances from 17pc to 80pc. Limits to the presence of transiting planets are set by modeling of the Kepler light curves. We find that the size of the planets detectable by Kepler around these small stars typically lies in the range 1 to 5 Earth radii within the habitable regions (P≤10 days). We identify one candidate transit with a period of 1.26 days whose light curve resembles a planet slightly smaller than the Moon. However, our pixel by pixel analysis of the Kepler data shows that the signal most likely arises from a background contaminating eclipsing binary. For 11 of these objects reliable photometric periods shorter than 7 days are derived, and are interpreted as rotational modulation of magnetic cool spots. For 3 objects we find possible photometric periods longer than 50 days that require confirmation. The Hα emission measurements and flare rates are used as proxies for chromospheric activity, and transversal velocities are used as an indicator of dynamical ages. These data allow us to discuss the relationship between magnetic activity and detectability of planetary transits around very low-mass stars. We show that super-Earth planets with sizes around 2 Earth radii are detectable with Kepler around about two thirds of the stars in our sample, independently of their level of chromospheric activity.

Abstract Copyright:

Journal keyword(s): astrobiology - techniques: photometric - techniques: spectroscopic - virtual observatory tools - stars: late-type - stars: flare

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3360 0
2 HZ 7 WD* 04 33 44.9627622456 +12 42 40.357601928   14.15 14.24 14.49   DA2.3 122 0
3 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1243 0
4 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 795 2
5 2MASS J18452595+4214532 Er* 18 45 25.9562988144 +42 14 53.401179192           ~ 5 0
6 2MASS J18454365+4331083 LM* 18 45 43.6524877560 +43 31 08.233183092           ~ 2 0
7 2MASS J18552553+4937521 Er* 18 55 25.5227972208 +49 37 51.886434324           ~ 6 0
8 2MASS J19000564+4507056 Er* 19 00 05.6491174536 +45 07 05.786899392           M4.5V 4 0
9 2MASS J19061079+3819367 Er* 19 06 10.7945766216 +38 19 36.509368440           M5Ve 6 0
10 UCAC4 647-065208 LM* 19 09 37.6848502896 +39 23 25.864794924       16.101   M5.5Ve 4 0
11 LSPM J1912+3826 Er* 19 12 28.0871061938 +38 26 15.797144066   18.5   15.2   M7V 16 0
12 LSPM J1913+4022 LM* 19 13 30.9123828312 +40 22 26.815064700   20.8   17.7   M7Ve 4 0
13 LP 230-35 LM* 19 14 21.4810893192 +43 09 00.701047440   19.5   17.1   M6V 11 0
14 2MASS J19155987+4305418 LM* 19 15 59.8781752536 +43 05 41.938291140           ~ 2 0
15 LSPM J1916+4032 LM* 19 16 24.9109359864 +40 32 41.424428832   20.2   18.6   M7V 5 0
16 2MASS J19202351+5037161 Er* 19 20 23.5076728440 +50 37 16.119941772           M6Ve 6 0
17 Kepler-42d Pl 19 28 52.5687991194 +44 37 08.990276298           ~ 36 1
18 LSPM J1932+4747 Er* 19 32 17.971200 +47 47 03.41628   17.94 16.34 15.73   M5Ve 9 0
19 LSPM J1938+4321 Er* 19 38 48.2358941952 +43 21 22.791281508   19.7   17.7   ~ 7 0
20 2MASS J19395613+4910064 Er* 19 39 56.1126976560 +49 10 06.349726128           M7Ve 4 0
21 LSPM J1943+4518 Er* 19 43 07.2878221800 +45 18 09.348901344   18.0   15.9   M5.5 20 0
22 LSPM J1944+4720 LM* 19 44 38.1407741257 +47 20 29.639679887   17.6   15.7   M5Ve 9 0
23 UCAC4 673-080223 LM* 19 52 44.6158491840 +44 28 51.597502788   16.903 14.912 14.279   ~ 1 0
24 2MASS J19562192+4131481 Er* 19 56 21.9246450192 +41 31 47.946879840           M5Ve 5 0
25 BD-15 6290d Pl 22 53 16.7323107416 -14 15 49.303409936           ~ 152 1
26 Ross 248 BY* 23 41 55.0363002516 +44 10 38.818911116   14.19   11.1   M5.0V 307 0

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2023.09.27-18:12:10

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