Abstract Details

Name: Kuljeet Marhas
Affiliation: Physical Research Laboratory
Conference ID: ASI2020_576
Title : Superflares from the primeval Sun
Authors and Co-Authors : Kuljeet Kaur Marhas and Ritesh Kumar Mishra
Abstract Type : Invited
Abstract Category : Sun and the Solar System
Abstract : Sun-like stars during their pre-main sequence stage have been recently observed by NASA’s Kepler mission to display massive flares at frequencies with an inferred periodicity that correlates with their rotation. The observations provide statistical information and confirmation about the energetic, active evolution of young stellar objects but do not make specific predictions either of the intensity, duration, or time of occurrence of flaring from similar young stellar objects. Understanding the paleo history of our Sun is critically linked to the formation of the solids and evolution of the proto-planetary disk that gave birth to the ‘unique grand architecture’ of our Solar system. Such information about events and processes during the nascent stage of the Solar system can be inferred from the frozen, fossilized archives in the primitive meteorites (chondrites). Calcium-, Aluminum,-rich inclusions (CAIs) are the first forming solids of the Solar system that have been absolutely dated using U-Pb decay systematics to ~4567 million years. Fossil evidence of the short-lived now-extinct radionuclide (SLN) 7Be, that decays to 7Li in ~53 days, was inferred in a CAI in the Efremovka meteorite from in situ isotopic studies using secondary ion mass spectrometer. The fossil evidence of short-lived now-extinct radionuclides 7Be, 10Be and 26Al in the CAI implies (1) Super-flares from the Sun with X-ray luminosity (Lx) of 10^32 erg/sec. Such a high intensity is about a million times (six orders of magnitude) higher than the highest X- class flares observed from the contemporary Sun (2) An extremely rapid transport (jets, outflows ?) mechanism existed during the birth of the Solar system that transported mm-cm sized objects to a distance of few astronomical units (AU) within a few years (3) Irradiation from Sun is the certain source of 7Be, 10Be and by inference of a significant fraction of the initial inventory making up our Solar system.