A Comparative Study of the Magnetic Activities of Low-mass Stars from M-type to G-type

Lin, Chia-Lung; Ip, W.-H.; Hou, W.-C.; Huang, Liang; Chang, Haiyan

doi:10.3847/1538-4357/ab041c

Cited by 40 publications

(36 citation statements)

References 60 publications

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“…3 we estimate that the average 3400-3940 K star in the Orion complex flares with an energy above 10 35 erg once every 130 days. This is almost 1000 times the rate measured by Lin et al (2019) for M dwarfs using K2 observations, highlighting how active these pre-main sequence sources are.…”

Section: Flare Occurrence Rate Of M Starsmentioning

confidence: 57%

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NGTS clusters survey – II. White-light flares from the youngest stars in Orion

Jackman

Wheatley

Acton

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Abstract We present the detection of high energy white-light flares from pre-main sequence stars associated with the Orion complex, observed as part of the Next Generation Transit Survey (NGTS). With energies up to 5.2 × 1035 erg these flares are some of the most energetic white-light flare events seen to date. We have used the NGTS observations of flaring and non-flaring stars to measure the average flare occurrence rate for 4 Myr M0-M3 stars. We have also combined our results with those from previous studies to predict average rates for flares above 1 × 1035 ergs for early M stars in nearby young associations.

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Section: Flare Occurrence Rate Of M Starsmentioning

confidence: 57%

“…powerlaw is designed for fitting to heavytailed distributions and has been used previously for analysis of flare occurrence rates (e.g. Lin et al 2019).…”

Section: Flare Occurrence Rate Of M Starsmentioning

confidence: 99%

NGTS clusters survey – II. White-light flares from the youngest stars in Orion

Jackman

Wheatley

Acton

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…As shown in Figure 8, the flare rates of Ross 15 are lower than that of YZ CMi and GJ 1243, and approximately in the middle of that of the three M5-type stars, and higher than those of spectral types ≥ M6. For M-type stars, the statistical results of the rotation -activity relation from several studies indicate that the stars with the shorter rotation periods tend to have higher flare activity (see Lin et al, 2019;Yang & Liu, 2019). The M4-type stars, YZ CMi and GJ 1243, have the rapid rotation periods, 2.77729 and 0.5927 ± 0.0002 day respectively (Hawley et al, 2014;Bychkov et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Photometric and Spectroscopic Study of Flares on Ross 15

Bai,

Esamdin,

Gao

et al. 2020

Preprint

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We conducted photometric and spectroscopic observations for Ross 15 in order to further study the flare properties of this less observed flare star. A total of 28 B-band flares are detected in 128 hours of photometric observations, leading to a total flare rate of 0.22 +0.04 −0.04 hour −1 , more accurate than that provided by previous work. We give the energy range of the B-band flare (10 29.5 -10 31.5 erg) and the FFD for the star. Within the same energy range, the FFD are lower than that of GJ 1243 (M4) and YZ CMi (M4.5), roughly in the middle of those of three M5-type stars and higher than the average FFDs of spectral types ≥ M6. We performed, for the first time to Ross 15, simultaneous highcadence spectroscopic and photometric observations, resulting in detection of the most energetic flare in our sample. The intensity enhancements of the continuum and Balmer lines with significant correlations between them are detected during the flare, which is same with that of the other deeply studied flare stars of the similar spectral type.

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“…By and large, Wolf 359 produces a flare as powerful as 10 30 erg approximately once every three hours. While a fast rotating M dwarf like Wolf 359 tends to produce frequent and powerful flares (Lin et al 2019), it is not known whether the boosted magnetic activity of our target is linked to its own rapid spin alone or to the close-in planet with an enlarged emission volume.…”

Section: The Flare Rate Of Wolf 359mentioning

confidence: 99%

“…Other stars, notably late-type dwarfs, being largely convective are even more predisposed to flare activity and encompass a larger range of energy output, particularly the young ones with fast rotation rates (Feinstein et al 2020). Based on the K2 lightcurves of G-to M-type dwarfs, Lin et al (2019) conclude that later type stars have higher flare occurrence frequencies but generally with less energetic output. M-dwarf flares with much shorter durations have been detected in millimeter wavelengths (MacGregor et al 2020).…”

Section: Introductionmentioning

confidence: 97%

Simultaneous Detection of Optical Flares of the Magnetically Active M Dwarf Wolf 359

Lin,

Chen,

Liu

et al. 2022

Preprint

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We present detections of stellar flares of Wolf 359, an M6.5 dwarf in the solar neighborhood (2.41 pc) known to be prone to flares due to surface magnetic activity. The observations were carried out from 2020 April 23 to 29 with a 1-m and a 0.5-m telescope separated by nearly 300 km in Xinjiang, China. In 27 hr of photometric monitoring, a total of 13 optical flares were detected, each with a total energy of 5 × 10 29 erg. The measured event rate of about once every two hours is consistent with those reported previously in radio, X-ray and optical wavelengths for this star. One such flare, detected by both telescopes on 26 April, was an energetic event with a released energy of nearly 10 33 erg. The twotelescope lightcurves of this major event sampled at different cadences and exposure timings enabled us to better estimate the intrinsic flare profile, which reached a peak of up to 1.6 times the stellar quiescent brightness, that otherwise would have been underestimated in the observed flare amplitudes of about 0.4 and 0.8, respectively, with single telescopes alone. The compromise between fast sampling so as to resolve a flare profile versus a longer integration time for higher photometric signal-to-noise provides a useful guidance in the experimental design of future flare observations.

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A Comparative Study of the Magnetic Activities of Low-mass Stars from M-type to G-type

Cited by 40 publications

References 60 publications

NGTS clusters survey – II. White-light flares from the youngest stars in Orion

NGTS clusters survey – II. White-light flares from the youngest stars in Orion

Photometric and Spectroscopic Study of Flares on Ross 15

Simultaneous Detection of Optical Flares of the Magnetically Active M Dwarf Wolf 359

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