Tenth anniversary of the first Einstein@Home discovery

Ten years ago, Einstein@Home published its first astronomical discovery. The radio pulsar J2007+2722 was found in July 2010 with our radio pulsar search, analyzing data from the Arecibo Radio Telescope. The discovery appeared in print on 10 September 2010. A more detailed article about the discovery was published later.

The Einstein@Home volunteers responsible for the discovery were Chris and Helen Colvin, of Ames, Iowa and Daniel Gebhardt, of Universität Mainz, Musikinformatik, Germany. Read more about their perspectives a decade later, in our forums.


Benjamin Knispel
Benjamin Knispel
Joined: 1 Jun 06
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To date, the Einstein@Home

To date, the Einstein@Home radio pulsar search has found 55 new pulsars in data from the Arecibo and Parkes radio telescopes. Since 2011, Einstein@Home has also been searching data from the Fermi gamma-ray satellite. To date, 25 gamma-ray discoveries have been published, and more are forthcoming. The methods being used are new, and were originally developed for continuous gravitational-wave searches.

These continuous gravitational-wave searches are still ongoing on Einstein@Home. While they have not yet found any sources, they continue to be the most sensitive of all searches being carried out for continuous gravitational waves.

The latest discovery from the Fermi gamma-ray pulsar search with Einstein@Home has just been submitted for publication to the Astrophysical Journal Letters and is available here. It is quite exciting: PSR J1653−0158 is a record-breaking binary pulsar. The neutron star at its center is rotating 508 times each second, which makes it one of the fastest-spinning ever found. The orbital period of 75 minutes is the shortest ever seen in similar binary pulsars, and the pulsar's surface magnetic field is possibly the weakest known to date. PSR J1653−0158 is the second binary pulsar discovered in gamma-rays. In fact, because it is invisible at radio wavelengths, it could not have been found by other means.

I would like to thank all of the hundreds of thousands Einstein@Home volunteers, for your continued support. Without you, our discoveries and the science that follows, would not have been possible.

posted on behalf of Bruce Allen, Einstein@Home director


Einstein@Home Project

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The companion mass of PSR

The companion mass of PSR J1653−0158 in table 2 seems also to be in the range of a brown dwarf.

0.012-0.015 solar masses are about 12.6 to 15.7 Jupiter masses. Brown Dwarfs have a mass between 13 and 80 Jupiter masses.

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I remember that

I remember that day!