Abstract Details

Name: RITESH Kumar MISHRA
Affiliation: Independent Researcher
Conference ID: ASI2021_266
Title : Evidence of multiple episodes of superflares during the birth of Our Sun
Authors and Co-Authors : Ritesh Kumar Mishra 1* 1* Present address: Independent researcher, Vill: Dhawalpur Po: Kaitha District Bhagalpur Bihar 813211 Kuljeet Kaur Marhas 2 2 Planetary Sciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad, Gujarat, 360009 India. Marc Chaussidon 3 3 Institut de Physique du Globe de Paris (IPGP) 1 rue Jussieu 75238 Paris Cedex 05 France.
Abstract Type : Oral
Abstract Category : Sun and the Solar System
Abstract : Determination of intensity and frequency of flares during the birth and neo-natal stage of the Sun are one of the most important unknowns in Solar system studies with implications for unique features of our solar system and several other questions including the origin and evolution of life. Sun-like stars during pre-main sequence stages (class 0-III) exhibit multiple episodes of variable and high intensity of activity of effusion of mass and radiation that are key determinant in the final architecture of any planetary systems. Study of short-lived now-extinct radionuclides (SLRs) present in the primitive meteorites provide evidences of these early solar system events and processes. A recent study of 7Be (t ½ =53 days) and 10Be (t ½ =1.38Ma) SLRs that decay to 7Li and 10B respectively provided the first evidence of a super flare from our Sun during its nascent age of ~0.5 Ma about 4567 Ma ago [1]. In the present 7Be-7Li and 10Be-10B isotopic study of one of the first forming solids of the Solar system called Calcium-aluminum-rich inclusion (CAI) from Vigarano meteorite, a well resolved excesses in the daughter nuclides of 7Li and 10Be that correspond to initial 7Be/9Be of (4.3±3.5)×10^-3and 10Be/9Be of (1.4±1.2)×10^-2 (2σ) were obtained from in-situ isotopic studies using high-resolution secondary ion mass spectrometer. The observed abundances of these radionuclides in the CAI that formed during the fiducial birth of the Solar system ( (0.07±0.08) Ma; inferred from previous 26Al-26Mg isotopic study) implies (1) multiple episodes of super flares from our Sun (2) the inferred intensity of super flare during the particular event was Lx = ~5× 10^32 erg/sec, (3) the intensities of solar flares were higher and probably reached its maximum during the class I and II stage of the pre-main sequence. [1] R. K. Mishra, K. K. Marhas Nature Astronomy, 3, 498-505, 2019.