NASA: Black Widow Pulsars Consume Their Mates

Learn how astronomers discovered PSR J1311−3430, a record-breaking black widow binary and the first of its kind discovered solely through gamma-ray observations. Black widow spiders and their Australian cousins, known as redbacks, are notorious for an unsettling tendency to kill and devour their male partners. Astronomers have noted similar behavior among two rare breeds of binary system that contain rapidly spinning neutron stars, also known as pulsars.

The essential features of black widow and redback binaries are that they place a normal but very low-mass star in close proximity to a millisecond pulsar, which has disastrous consequences for the star. Black widow systems contain stars that are both physically smaller and of much lower mass than those found in redbacks.

So far, astronomers have found at least 18 black widows and nine redbacks within the Milky Way, and additional members of each class have been discovered within the dense globular star clusters that orbit our galaxy.

One black widow system, named PSR J1311-3430 and discovered in 2012, sets the record for the tightest orbit of its class and contains one of the heaviest neutron stars known. The pulsar’s featherweight companion, which is only a dozen or so times the mass of Jupiter and just 60 percent of its size, completes an orbit every 93 minutes – less time than it takes to watch most movies.

The side of the star facing the pulsar is heated to more than 21,000 degrees Fahrenheit (nearly 12,000 C), or more than twice as hot as the sun’s surface. Recent studies allow a range of values extending down to 2 solar masses for the pulsar, making it one of the most massive neutron stars known.

Watch the video to learn more about this system and its discovery from some of the scientists involved. 

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Completed: 01 March 2013
Animators: Cruz DeWilde (Avant Gravity) (Lead)
Walt Feimer (HTSI)
Dana Berry (Skyworks Digital)
Scott Wiessinger (USRA)
Video Editor: Scott Wiessinger (USRA)
Interviewees: Alice Harding (NASA/GSFC)
Paul Ray (NRL)
Roger Romani (Stanford University)
Holger Pletsch (Albert Einstein Institute)
Narrator: Karen Fox (ASI)
Producer: Scott Wiessinger (USRA)
Scientist: Roger Romani (Stanford University)
Videographer: Rob Andreoli (AIMM)
Writers: Francis Reddy (Syneren Technologies)
Scott Wiessinger (USRA)

Credit:

NASA’s Goddard Space Flight Center

Greenbank Telescope image credit: NRAO/AUI