2021AJ....162...11L


Query : 2021AJ....162...11L

2021AJ....162...11L - Astron. J., 162, 11-11 (2021/July-0)

EDEN: flare activity of the nearby exoplanet-hosting M dwarf Wolf 359 based on K2 and EDEN light curves.

LIN C.-L., CHEN W.-P., IP W.-H., APAI D., BIXEL A., BOYLE R., CHAVEZ J.P., ESPINOZA N., GIBBS A., GABOR P., HENNING T., MANCINI L., RACKHAM B.V., SCHLECKER M., DIETRICH J., SOCIA Q.J., KEPPLER M., BHANDARE A. and HABERLE M.

Abstract (from CDS):

We report the flare activity of Wolf 359, the fifth closest star to the Sun and a candidate exoplanet-hosting M dwarf. The star was a target of the Kepler/K2 mission and was observed by the EDEN project, a global network of 1-2 m class telescopes for detection and characterization of rocky exoplanets in the habitable zones of late-M dwarfs within 50 light year from the solar system. In the combination of the archived K2 data and our EDEN observations, a total of 872 flares have been detected, 861 with the K2 (860 in the short-cadence and 18 in the long-cadence data, with 17 long-cadence events having short-cadence counterparts) and 11 with EDEN. Wolf 359 has relatively strong flare activity even among flaring M dwarfs, in terms of the flare activity indicator (FA) defined as the integrated flare energy relative to the total stellar bolometric energy, where FA = ∑Ef/∫Lbol dt ∼ 8.93 x 10–5 for the long-cadence flares, whereas for K2 short cadence and EDEN flares, the FA values are somewhat larger, FA ≃ 6.67 x 10–4 and FA ≃ 5.25 x 10–4, respectively. Such a level of activity, in accordance with the rotation period (Prot), suggests the star to be in the saturation phase. The size of the starspots is estimated to be at least 1.87% ± 0.59% of the projected disk area of Wolf 359. We find no correlation of FA with the stellar rotational phase. Our analysis indicates a flare frequency distribution in a power-law form of dN/dE∝E^-α^ with α = 2.13 ± 0.14, equivalent to an occurrence rate of flares Ef >= 1031 erg about once per day and of superflares with Ef >= 1033 erg approximately 10 times per year. These superflares may impact the habitability of system in multiple ways, the details of which are topics for future investigations.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Planet hosting stars - Exoplanet systems - Exoplanet astronomy - Exoplanets - Flare stars - Stellar flares - Stellar phenomena

VizieR on-line data: <Available at CDS (J/AJ/162/11): table2.dat table3.dat table4.dat>

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3234 0
2 V* YZ CMi Er* 07 44 40.1723046464 +03 33 08.875227574 13.761 12.831 11.225 9.958 8.263 M4.0Ve 840 0
3 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1421 0
4 BD+20 2465 Er* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1243 0
5 Wolf 359b Pl? 10 56 28.9208702274 +07 00 53.003285286           ~ 1 0
6 Wolf 359c Pl? 10 56 28.9208702274 +07 00 53.003285286           ~ 2 0
7 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 683 0
8 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1160 0
9 V* EV Lac Er* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0Ve 861 2

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2022.10.07-04:21:14

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