Supernova R. Sri Madhavi

What is Supernova? Supernova is a celestial body Supernova is actually a stellar explosion The term, “Supernova” was coined in 1926 by a Swedish astrophysicist, Fritz Zwicky

Supernova is a celestial body

Supernova is actually a stellar explosion

The term, “Supernova” was coined in 1926 by a Swedish astrophysicist, Fritz Zwicky

What is the meaning of Supernova? A very bright new star shining in the celestial sphere

A very bright new star shining in the celestial sphere

How often does a Supernova occur? About once in 50 years It happens in the galaxy Its size is about the size of the milky way

About once in 50 years

It happens in the galaxy

Its size is about the size of the milky way

What is the importance of Supernova? Supernova plays a significant role in enriching the interstellar medium with higher mass elements the expanding shock waves from supernova explosions can trigger the formation of new stars

Supernova plays a significant role in enriching the interstellar medium with higher mass elements

the expanding shock waves from supernova explosions can trigger the formation of new stars

Types of Supernova There are two common types of Supernova: Ia II

There are two common types of Supernova:

Ia

II

Type Ia Supernova This supernova is the result of the activity of a couple of stars; one of which is a type of star known as “White Dwarf” White dwarf is a star rich in carbon and oxygen.

This supernova is the result of the activity of a couple of stars; one of which is a type of star known as “White Dwarf”

White dwarf is a star rich in carbon and oxygen.

Type Ia Supernova The “White Dwarf” absorbs matter from the companion and therefore its mass increases, When the density of the core of the White Dwarf reaches a critical density of 2 x 10 9 g/cm 3 carbon and oxygen undergo fusion uncontrollably, and therefore the star explodes

The “White Dwarf” absorbs matter from the companion and therefore its mass increases,

When the density of the core of the White Dwarf reaches a critical density of 2 x 10 9 g/cm 3

carbon and oxygen undergo fusion uncontrollably, and therefore the star explodes

Type II Supernova This occurs in a star which is in the verge of death At this point of time, there is no fuel in the star to burn, and there is so much accumulation of iron inside the star. Due to the weight of iron, the star fragments and collapses

This occurs in a star which is in the verge of death

At this point of time, there is no fuel in the star to burn, and there is so much accumulation of iron inside the star.

Due to the weight of iron, the star fragments and collapses

Mechanism of Supernova Ia

Mechanism of supernova: Onion Layers

Mechanism of Supernova

Other Types Other types of Supernova are: Ib Ic IIP IIL

Other types of Supernova are:

Ib

Ic

IIP IIL

What happens when Supernova occurs? - 1 A supernova can radiate as much energy as the Sun could emit over its life span.

A supernova can radiate as much energy as the Sun could emit over its life span.

What happens when Supernova occurs? -2 The explosion expels star's material at a velocity of up to 30,000 km/s (a tenth the speed of light )

The explosion expels star's material at a velocity of up to 30,000 km/s (a tenth the speed of light )

What happens when Supernova occurs? -3 The material coming out of a Supernova produces a shock wave into the surrounding interstellar medium . This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant .

The material coming out of a Supernova produces a shock wave into the surrounding interstellar medium .

This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant .