Astronomy Picture of the Day

   [1]Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                                2021 July 14

         IFRAME: [2]https://www.youtube.com/embed/V_Kd4YBNs7c?rel=0

      GW200115: Simulation of a Black Hole Merging with a Neutron Star
    Video Credit: Simulation: [3]S.V. Chaurasia ([4]Stockholm U.), [5]T.
                    Dietrich ([6]Potsdam U. & [7]MPIGP);
      Visualization: [8]T. Dietrich ([9]Potsdam U. & [10]MPIGP), [11]N.
            Fischer, [12]S. Ossokine, [13]H. Pfeiffer ([14]MPIGP)

   Explanation: What happens when a black hole destroys a neutron star?
   Analyses indicate that just such an event created gravitational wave
   event [15]GW200115, detected in 2020 January by [16]LIGO and [17]Virgo
   observatories. To better understand the unusual event, the [18]featured
   visualization was created from a computer simulation. The visualization
   video starts with the [19]black hole (about 6 times the Sun's mass) and
   [20]neutron star (about 1.5 times the Sun's mass) circling each other,
   together emitting an increasing amount of [21]gravitational radiation.
   The picturesque pattern of [22]gravitational wave emission is shown in
   blue. The duo [23]spiral together increasingly fast until the neutron
   star becomes completely absorbed by the [24]black hole. Since the
   neutron star did not break apart during [25]the collision, little light
   escaped -- which matches the lack of an observed optical counterpart.
   The remaining black hole [26]rings briefly, and as that dies down so do
   the emitted gravitational waves. The 30-second [27]time-lapse video may
   seem short, but it actually lasts about 1000 times longer than the real
   merger event.

     Astrophysicists: [28]Browse 2,500+ codes in the Astrophysics Source
                                Code Library
                       Tomorrow's picture: open space
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    Authors & editors: [40]Robert Nemiroff ([41]MTU) & [42]Jerry Bonnell
                                 ([43]UMCP)
          NASA Official: Phillip Newman [44]Specific rights apply.
              [45]NASA Web Privacy Policy and Important Notices
                A service of: [46]ASD at [47]NASA / [48]GSFC
                           & [49]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://www.youtube.com/embed/V_Kd4YBNs7c?rel=0
   3. https://www.su.se/english/profiles/swch0281-1.484276
   4. https://www.su.se/english/
   5. https://www.aei.mpg.de/person/45262/2784
   6. https://www.uni-potsdam.de/en/theoretical-astrophysics/
   7. https://www.aei.mpg.de/
   8. https://www.aei.mpg.de/person/45262/2784
   9. https://www.uni-potsdam.de/en/theoretical-astrophysics/
  10. https://www.aei.mpg.de/
  11. https://www.aei.mpg.de/person/59640/2784
  12. https://www.aei.mpg.de/person/44382/2784
  13. https://www.aei.mpg.de/person/54205/2784
  14. https://www.aei.mpg.de/
  15. https://www.ligo.org/detections/NSBH2020.php
  16. https://www.ligo.org/about.php
  17. http://public.virgo-gw.eu/the-virgo-collaboration/
  18. https://www.aei.mpg.de/726542/gw200105-gw200115
  19. https://science.nasa.gov/astrophysics/focus-areas/black-holes
  20. https://imagine.gsfc.nasa.gov/science/objects/neutron_stars1.html
  21. https://en.wikipedia.org/wiki/Gravitational_wave
  22. https://spaceplace.nasa.gov/gravitational-waves/en/
  23. https://static.boredpanda.com/blog/wp-content/uploads/2016/11/black-white-cats-yin-yang-70-5824837231803__605.jpg
  24. https://apod.nasa.gov/htmltest/rjn_bht.html
  25. https://apod.nasa.gov/apod/ap190903.html
  26. https://apod.nasa.gov/apod/ap160211.html
  27. https://youtu.be/V_Kd4YBNs7c
  28. http://ascl.net/
  29. https://apod.nasa.gov/apod/ap210713.html
  30. https://apod.nasa.gov/apod/archivepix.html
  31. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  32. https://apod.nasa.gov/apod/lib/aptree.html
  33. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  34. https://apod.nasa.gov/apod/calendar/allyears.html
  35. https://apod.nasa.gov/apod.rss
  36. https://apod.nasa.gov/apod/lib/edlinks.html
  37. https://apod.nasa.gov/apod/lib/about_apod.html
  38. http://asterisk.apod.com/discuss_apod.php?date=210714
  39. https://apod.nasa.gov/apod/ap210715.html
  40. http://www.phy.mtu.edu/faculty/Nemiroff.html
  41. http://www.phy.mtu.edu/
  42. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  43. http://www.astro.umd.edu/
  44. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  45. https://www.nasa.gov/about/highlights/HP_Privacy.html
  46. https://astrophysics.gsfc.nasa.gov/
  47. https://www.nasa.gov/
  48. https://www.nasa.gov/centers/goddard/
  49. http://www.mtu.edu/