2020MNRAS.492.5141Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST19:14:00

2020MNRAS.492.5141Z - Mon. Not. R. Astron. Soc., 492, 5141-5151 (2020/March-2)

Activity and differential rotation of the early M dwarf Kepler-45 from transit mapping.

ZALESKI S.M., VALIO A., CARTER B.D. and MARSDEN S.C.

Abstract (from CDS):

Little is known of the activity and differential rotation of low luminosity, early M dwarfs from direct observation. We present the first stellar activity analysis of star-spots and faculae for the hot Jupiter hosting M1V dwarf Kepler-45 from Kepler transit light curves. We find star-spot and facula temperatures contrasting a few hundred degrees with the quiet photosphere, hence similar to other early M dwarfs having a convective envelope surrounding a radiative core. Star-spots are prominent close to the centre of the stellar disc, with faculae prominent towards the limbs, similar to what is observed for the Sun. Star-spot and facula mean sizes are about 40 and 45 x 103 km, respectively, and thus faculae occupy a 10 per cent larger surface area than the star-spots. A short-term activity cycle of about 295 d is observed that is reminiscent of those seen for other cool dwarfs. Adopting a solar-type differential rotation profile (faster equatorial rotation than polar rotation), our star-spot and facula temporal mapping indicates a rotation period of 15.520 ± 0.025 d at the transit latitude of -33.2°. From the mean stellar rotation of 15.762 d, we estimate a rotational shear of 0.031 ± 0.004 rad d-1, or a relative differential rotation of 7.8 ± 0.9 per cent. Kepler-45's surface rotational shear is thus consistent with observations and theoretical modelling of other early M dwarfs that indicate a shear of less than 0.045 rad d-1 and no less than 0.03 rad d-1 for stars with similar stellar rotation periods.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: activity - stars: solar-type

Simbad objects: 19

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Number of rows : 19

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 HATS-71b Pl 01 02 12.2812327851 -61 45 21.659877600           ~ 7 0
2 NGTS-1b Pl 05 30 51.4522866697 -36 37 50.896558281           ~ 27 0
3 HATS-6b Pl 05 52 35.2366541380 -19 01 53.970515066           ~ 34 0
4 HD 41004Bb Pl 05 59 49.6473573887 -48 14 22.805780232           ~ 24 1
5 HD 42581 Er* 06 10 34.6152510171 -21 51 52.658021185 10.801 9.607 8.125 7.164 6.121 M1V 398 0
6 V* DS Leo BY* 11 02 38.3419263291 +21 58 01.704479733 12.246 11.049 9.572 8.638 7.634 M1.0V 172 0
7 BD+16 2708 Er* 14 54 29.2359453437 +16 06 03.798840236 12.86 11.686 10.150 9.116 7.872 M3V 244 1
8 V* EY Dra BY* 18 16 16.7813769184 +54 10 21.761728162   13.69 11.84     dM1.5e 67 0
9 Kepler-63 Ro* 19 16 54.2861871448 +49 32 53.450828682   12.36 12.02     G5 73 1
10 HD 180617 Ro* 19 16 55.2565250393 +05 10 08.038856129 11.768 10.63 9.115 8.076 6.782 M3-V 352 0
11 CoRoT-2 * 19 27 06.4944821296 +01 23 01.357597206   13.422 12.568 12.204 11.49 G7V+K9V 214 2
12 Kepler-45 Ro* 19 31 29.4966619067 +41 03 51.356309221     16.88 16.63   M1V 73 1
13 Kepler-45b Pl 19 31 29.4966619067 +41 03 51.356309221           ~ 57 1
14 Kepler-71 Ro* 19 39 27.7155063029 +46 17 08.942790311       15.35   G8V 44 1
15 BD+47 2936 EB* 19 50 50.2474562793 +48 04 51.097364378       8.8   K4V 221 2
16 G 208-42 Er* 19 51 09.3205269987 +46 29 00.208931632   14.47   12.544   M4.0V 112 0
17 Kepler-17 Ro* 19 53 34.8642919207 +47 48 54.049941399   14.6   13.6   G5V 114 1
18 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 861 1
19 TRAPPIST-1 LM* 23 06 29.3684052886 -05 02 29.031690445     18.798 16.466 14.024 M7.5e 532 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-19:14:00

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