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Home Science & Tech

TESS finds Pulsating White Dwarf

October 25, 2021
in Science & Tech
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TESS finds Pulsating White Dwarf
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In news- A team of astronomers, using NASA’s Transiting Exoplanet Survey Satellite (TESS) have reported a unique phenomenon in a white dwarf about 1,400 light years from Earth. They saw the white dwarf lose its brightness in 30 minutes. 

What is a pulsating white dwarf?

A pulsating white dwarf is a white dwarf star whose luminosity varies due to non-radial gravity wave pulsations within itself. Known types of pulsating white dwarfs include DAV, or ZZ Ceti, stars, with hydrogen-dominated atmospheres. 

White dwarf and TW Pictoris-

  • It is part of a binary system called TW Pictoris, located in the Pictoris constellation, and the binary system is about 1400 light years from us.
  • TW Pictoris consists of a white dwarf that feeds from a surrounding accretion disk fuelled by hydrogen and helium from its smaller companion star. 
  • The two objects are so close to each other that the star transfers material to the white dwarf. 
  • As this material approaches the white dwarf it forms an accretion disk or a disk of gas, plasma, and other particles around it. 

It’s switch on and off mode-

  • As per scientists,in this system the donor star in orbit around the white dwarf keeps feeding the accretion disk. 
  • As the accretion disk material slowly sinks closer towards the white dwarf it generally becomes brighter(on mode). 
  • During the ‘on’ mode, when the brightness is high, the white dwarf feeds off the accretion disk as it normally would. 
  • Suddenly and abruptly the system turns ‘off’ and its brightness plummets.
  • When this happens the magnetic field is spinning so rapidly that a centrifugal barrier stops the fuel from the accretion disk constantly falling on to the white dwarf.

   The new discovery will help the astronomers understand the physics behind accretion – how black holes and neutron stars feed material from their nearby stars. 

Transiting Exoplanet Survey Satellite (TESS)-

  • TESS  is a space telescope for NASA’s Explorers program, designed to search for exoplanets ( in orbit around the brightest dwarf stars in the sky) using the transit method in an area 400 times larger than that covered by the Kepler mission.
  • It was launched in 2018 by Falcon rocket system.
  • Using the Hubble Space telescope and TESS, astronomers have identified several white dwarfs over the years.
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Source: Indian Express
Tags: NewspaperPrelims

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