Physics Research Initiative (PRI) Pokhara is a group of researchers formed by academic faculties and young professional physicists with an aim to inspire young researcher and promote science literacy in general public. The three main areas of PRI are Research, Outreach, and Awareness on science and technology. PRI is working closely with Department of Physics at Prithvi Narayan Campus to conduct its various scientific programs. Since its inception in 2017, PRI has organized twenty one scientific talks in a series called “Scientific Discussion Series”; three workshops in to empower young researcher with computational techniques, three “Friday Science Social” programs; observation of “National Science Day” in Pokhara, and a couple of outreach program in a public library and in a secondary school. PRI has also formed a “Feynman Study Circle” to engage undergraduate physics students in learning and discussing “textbook” physics.
We used NASA Kepler K2 mission short cadence (~1 minute) and long cadence (~30 minutes) data to study the white light flare (WLF) rates of low mass objects with spectral types in the range M5-L5. We analyzed WLFs of 42 objects using short cadence data and ~500 objects using long cadence data. They were observed by K2 mission in different campaigns (Campaign 3 - Campaign 18). We observe a higher flare rate in the mid-M dwarfs which are fully convective. The flare rate decreases with the decrease in effective temperatures. In an energy range of 1029 - 1033.5 ergs, the flare energies follow a power law with slopes in range -(1.3 - 2.0). The cooler objects tend to have shallower slopes. We find that the flares are also produced by objects with spectral types as late as L5. The occurrence of super- flares on targets with spectral types as late as 15 suggests that either they have strong magnetic fields comparable to those in the warmer targets or the volumes associated with flares are larger on cooler targets, or a combination thereof. In addition, we characterized superflares (flares with energy >1033 ergs) on young brown dwarfs, late-M dwarfs (M8 and M9 spectral types) and early L dwarfs. The results will provide significant inputs into exoplanet atmosphere and climate models which are aimed at constraining the habitability of M dwarf planets
*Rishi R. Paudel is a postdoctoral fellow at NASA, Goddard Center, USA. He has a PhD in Astronomy from the University of Delaware, USA and MSc in physics from Tribhuvan University. He has authored more than ten research articles in international peer review journals. His research area includes, but not limited to, Magnetic activity, astrometry, kinematics, atmospheres and formation of low mass stars and brown dwarfs.
Date: 08 August, 2019
1 Bhadra, 2076