Lamost Observations of Flaring M Dwarfs in the Kepler Field

Chang, Haiyan; Song, Yuanli; Luo, A-Li; Huang, Liang; Ip, W.-H.; Fu, J. N.; Zhang, Yong; Hou, Yonghui; Cao, Zihuang; Wang, Y.-F.

doi:10.3847/1538-4357/834/1/92

Cited by 29 publications

(20 citation statements)

References 20 publications

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“…Thus, this confirms the results of Candelaresi et al (2014) who also found that the slope for the flare energy distribution is nearly constant. This was recently confirmed with LAMOST by Chang et al (2017).…”

Section: Relation With Rotation Periodsupporting

confidence: 58%

“…To make the statistics of the sample more robust and disentangle binarity from the flaring nature, detailed spectroscopic studies of the flare stars are required to exclude the possibility of a companion (Karoff et al 2016;Pedersen et al 2017;Chang et al 2017). In particular, the existence of flaring Astars conflicts with our current understanding of stellar evolution, and these could use special spectroscopic scrutiny.…”

Section: Discussionmentioning

confidence: 99%

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Stellar Flares Observed in Long-cadence Data from the Kepler Mission

Doorsselaere

Shariati

Debosscher

2017

ApJS

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We aim to perform a statistical study of stellar flares observed by Kepler. We want to study the flare amplitude, duration, energy and occurrence rates, and how they are related to the spectral type and rotation period. To that end, we have developed an automated flare detection and characterisation algorithm. We have harvested the stellar parameters from the Kepler input catalogue and the rotation periods from McQuillan et al. (2014a). We find several new candidate A stars showing flaring activity. Moreover, we find 653 giants with flares. From the statistical distribution of flare properties, we find that the flare amplitude distribution has a similar behaviour between F+G-types and K+M-types. The flare duration and flare energy seem to be grouped between G+K+M-types vs. F-types and giants. We also detect a tail of stars with high flare occurrence rates across all spectral types (but most prominent in the late spectral types), and this is compatible with the existence of "flare stars". Finally, we have found a strong correlation of the flare occurrence rate and the flare amplitude with the stellar rotation period: a quickly rotating star is more likely to flare often, and has a higher chance to generate large flares.

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Section: Relation With Rotation Periodsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Stellar Flares Observed in Long-cadence Data from the Kepler Mission

Doorsselaere

Shariati

Debosscher

2017

ApJS

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“…Data 130 Release 3 includes 5.75 million spectra and stellar parameters for >3 million stars. LAMOST has an ideal view of the field observed for four years by the Kepler satellite, and several groups have used the ∼50,000 stars observed in the Kepler field to characterize its stellar populations (e.g., Dong et al 2014;Frasca et al 2016;Ren et al 2016;Chang et al 2017;Dong et al 2017). Other work based on LAMOST spectra includes measurements of stellar activity (e.g., Fang et al 2016) and identification of important subclasses of objects from ultra-metal-poor stars (e.g., and metalliclined Am stars (e.g., Hou et al 2015).…”

Section: Overview Of the Survey Landscapementioning

confidence: 99%

The 13th Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey Mapping Nearby Galaxies at Apache Point Observatory

Albareti

Prieto

Almeida

et al. 2017

ApJS

500

281

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“…The cooler stars such as K and M dwarfs also show similar, surprisingly energetic flares (Kowalski et al 2013). Superflares on the most active stars, M dwarfs, are common and have been widely studied (e.g., Walkowicz et al 2011;Hawley et al 2014;Chang et al 2017). During these flare events, the total energy could be more than 10 34 erg, accompanied by chromospheric and coronal emission lines.…”

Section: Introductionmentioning

confidence: 99%

The Flaring Activity of M Dwarfs in the Kepler Field

Yang

Liu

Gao

et al. 2017

ApJ

172

157

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Flare events are mainly due to magnetic reconnection and thus are indicative of stellar activity. The Kepler Space Observatory records numerous stellar activities with unprecedented high photometric precision in flux measurements. It is perfectly suitable for carrying out a statistical study of flares. Here we present 540 M dwarfs with flare events discovered using Kepler long-cadence data. The normalized flare energy, as defined by the ratio to bolometric stellar luminosity, L L flare bol , is used to indicate the flare activity. We find that, similar to the X-ray luminosity relation, the L L flare bol versus P rot relation can also be described with three phases, supersaturation, saturation, and exponential decay, corresponding to an ultra-short period, a short period, and a long period. The flare activity and the number fraction of flaring stars in M dwarfs rise steeply near M4, which is consistent with the prediction of a turbulent dynamo. The size of starspots are positively correlated with flare activity. The L L flare bol ratio has a power-law dependence on L L H bol a , a parameter indicative of stellar chromosphere activity. According to this relation, a small enhancement in chromosphere activity may cause a huge rise in flare energy, which suggests that superflares or hyperflares may not need an extra excitation mechanism. Through a comparison study, we suggest that flare activity is a more suitable indicator for stellar activity, especially in the boundary region. However, contrary to what is expected, some M dwarfs with strong flares do not show any light variation caused by starspots. Follow-up observations are needed to investigate this problem.

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Lamost Observations of Flaring M Dwarfs in the Kepler Field

Cited by 29 publications

References 20 publications

Stellar Flares Observed in Long-cadence Data from the Kepler Mission

Stellar Flares Observed in Long-cadence Data from the Kepler Mission

The 13th Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey Mapping Nearby Galaxies at Apache Point Observatory

The Flaring Activity of M Dwarfs in the Kepler Field

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